16.3 Airbag (AB) Contents

Transcription

1 16.3 Airag (AB) Contents 16.3 Models 129, 140, 202 (as of 07/93 ) 1), 170, 208, 210 (up to 07/98) Page Diagnosis (driver/passenger-side airag/side airag) Function Test /1 Diagnostic Troule Code (DTC) Memory /1 Fault Frequency, Time Span /1 Actual Values /1 Complaint Related Diagnostic Chart /1 Electrical Test Program (driver/passenger-side airag/ side airag) Component Locations /1 Connection of Components /1 Preparation for Test /1 Test /1 Effective Serial Numers for new control modules, as of 07/93 Model Chassis End Numer 129 1F A A F As of approximately 04/95 production, only the ETR s of uckled seat elts will deploy in a severe rear impact (previously the AB s would also deploy). New control module for side airag, Model 210 As of model introduction, only the ETR s of uckled seat elts will deploy. Automatic child seat recognition (ACSR) for model 170, as of model introduction. Functions only with child seat model: "Baysafe". Control Module Programming Vehicle Equipment /1 Parameters /1 1) Used as of chassis end Numer, see Effective Serial Numer for new control modules, as of 07/93 tale. Diagnostic Manual Body and Accessories 11/ AB C/1

2 Diagnosis - Function Test (driver/passenger-side airag/side airag) a CAUTION! Risk of Injury when performing Diagnostic Tests and repairs on components of the SRS system. Store oth airags and side airags with opening surface pointing upward. Do not expose to temperatures aove 100 C. Interrupt any electrical current from reaching the airag unit. a CAUTION! Risk of injury if airag units and ETR units are ignited accidentally or if stored with the opening end facing downward which may cause the accidentally ignited components to fly aout causing injury. Danger to persons also exists if the components are disposed of y cutting apart with cutting torches or other cutting/separation devices. Danger also exists if disposing the untriggered units via refuse collection or via smelting/caronizing companies. Protective measures/supervision - Place removed airag unit with the opening side facing upward. - Allow only properly trained dealer staff to supervise, purchase, transport, store, test/replace any of the SRS components. - Install all airag or ETR units once pulled from the parts department. - Protect all airag or ETR units from any sparks, open flame, or temperatures aove 100 C. - Do not transport airag or ETR units in the passenger compartment, rather transport securely in their original packaging in the trunk. - Do not allow oil, grease or cleaning agents come in contact with the airag or ETR units - Perform SRS tests only with approved test equipment (such as HHT), while installed in the vehicle without occupants. - When reconnecting the vehicle attery or any outside electrical source, with the ignition turned ON, do not allow any occupants inside the vehicle. - Airag or ETR units which have een dropped from a height greater than 18 inches must e replaced. - Prior to disposing the airag or ETR units, the units must e made unuseale y discharging. - In order to render the airag and ETR unit un-useale, the specially made discharge harness must e used and at the same time maintain a safe distance of at least 33 feet from the units eing discharged. Prior to undertaking any chassis/ody repairs, installation/repair work on airag and ETR units, or any components which come in contact with the airag and ETR units, or are part of the electrical circuit of airag and ETR units (such as installation of the steering wheel), the following conditions must e met: - Remove ignition key. - Disconnect any outside source of electrical circuit (i.e. attery charger). - When performing interior repairs or welding operations, disconnect the connector from the SRS control module. Diagnostic Manual Body and Accessories 11/ AB 11/1

3 Diagnosis - Diagnostic Troule Code (DTC) Memory (driver/passenger-side airag/side airag) a CAUTION! Risk of Injury when performing Diagnostic Tests and repairs on components of the SRS system. Store oth airags and side airags with opening surface pointing upward. Do not expose to temperatures aove 100 C. Interrupt any electrical current from reaching the airag unit. Preparation for Test: 1. Review 11, 12, 13, 20, 21, 22, 23, 31, Please see 11/3 for function of SRS MIL (A1e15). Test step/test scope Test condition Nominal value Possile cause/remedy 1) O 1.0 Supplemental Restraint System (SRS) Ignition key in position 1. SRS MIL (A1e15) comes on and then extinguishes after approximately 4 20 seconds. DTC Memory 12 O 2.0 Automatic Child Seat Recognition (ACSR) Ignition key in position 1. Automatic child seat recognition warning lamp (N72e1) illuminates and then goes out after approx. 4 seconds. (MB child seat model: "Baysafe" not installed). Automatic child seat recognition warning lamp (N72e1) illuminates and does not go out: 12 Automatic child seat recognition warning lamp (N72e1) does not illuminate: 23 O 22.0, 23 O ) Oserve Preparation for Test, see 22. Diagnostic Manual Body and Accessories 11/ AB 11/2

4 Diagnosis - Diagnostic Troule Code (DTC) Memory (driver/passenger-side airag/side airag) Function of the SRS MIL (A1e15): SRS system is fully functional, if the SRS MIL goes out after 4 seconds. SRS MIL goes out after 2 minutes, system fault noted, occupant protection not affected. Vehicle without side airag: - Low attery voltage - SRS MIL - Seat elt uckle latch I Vehicle with side airag: SRS system is fully functional, if SRS MIL goes out after approx seconds. SRS MIL remains illuminated as long as the following faults are present: - Low attery voltage - SRS MIL - Communication fault in the side ag sensors - Seat elt uckle latch I - Seat occupation recognition SRS MIL remains illuminated continuously, which may result in a nondeployment or a possile false airag deployment. SRS MIL links after the replacement of the control module, the control module has not een programmed/parametered. The following applies to vehicles which have the Automatic Child Seat Recognition (ACSR) system installed. Function of automatic child seat recognition warning lamp (E13, N72e1) (AIRBAG OFF): If the "Baysafe" child seat is installed: The automatic child seat recognition warning lamp (N72e1) (AIRBAG OFF) is illuminated and verifies the recognition of the "Baysafe" child seat. The passenger-side airag is turned off. Side airag and ETR remain in use. If the "Baysafe" child seat is NOT installed: Automatic child seat recognition warning lamp (N72e1) (AIRBAG OFF) goes out after approx. 4 seconds. If the automatic child seat recognition warning lamp (N72e1) (AIRBAG OFF) does not go out after approx. 4 seconds, this indicates a fault in the ACSR system. When turning on the vehicle illumination, the automatic child seat recognition warning lamp (N72e1) is dimmed as well. Note: SRS MIL illumination can only e erased via the HHT, if no current DTC's are stored in memory. Diagnostic Manual Body and Accessories 11/ AB 11/3

5 Diagnosis - Diagnostic Troule Code (DTC) Memory (driver/passenger-side airag/side airag) Diagnosis - Diagnostic Troule Code (DTC) Memory (driver/passenger-side airag/side airag) Preliminary work: Diagnosis - Function Test Preparation for DTC readout 1. Review 11, 12, 13, 20, 21, 22, 23, 31, Fuses OK. 3. Battery voltage V 4. SRS MIL (A1e15) illuminates. 5. Connect Hand-Held Tester (HHT) as per connection diagram, see section 0, and readout DTC memory. a CAUTION! Do not connect attery trickle charger. a CAUTION! Risk of Injury when prforming Diagnostic Tests and repairs on components of the SRS system. Store oth airags and side airags with opening surface pointing upward. Do not expose to temperatures aove 100 C. Interrupt any electrical current from reaching the airag unit. Note: As of 07/93, diagnostic troule codes (DTC s) can only e read out and erased using the Hand-Held Tester (HHT). Determine MB numer of the SRS control module via HHT (see DTC chart on page 12/3): The SRS control modules eginning with the numer 000, the fault code1 is valid. Those eginning with 001, the fault code 2 is valid. p When installing additional accessories, oserve harness clearances near SRS sensor lines. DTC's for Lower Control Field Control Module (N72) see 12/6 Test equipment; See MBUSA Standard Service Equipment Program Hand-Held Tester (HHT) 1) See S.I. in groups 58 and 99. 1) Availale through the MBUSA Standard Equipment Program. Diagnostic Manual Body and Accessories 11/ AB 12/1

6 Diagnosis - Diagnostic Troule Code (DTC) Memory (driver/passenger-side airag/side airag) i A current fault is indicated y the DTC eing highlighted in lack. Additional detailed information is given with most DTC s, which will indicate possile faults conditions or portions thereof: > ] Resistance too great. < ] Resistance too low. ±$ Short circuit to ground (GND) ±+ Short circuit to positive (POS). // Open circuit. Fault frequency and time span of the fault can e read y pressing the i key. Fault frequency: Faults are noted y frequency of occurrence, i.e.: 5 periodic faults, 5 occurances, eliminated 5 times. Time span: The amount of time elapsed since last fault, or since fault eliminated itself. Diagnostic Manual Body and Accessories 11/ AB 12/2

7 Diagnosis - Diagnostic Troule Code (DTC) Memory (driver/passenger-side airag/side airag) DTC A with fault code 1 with fault code 2 Possile cause Test step/remedy 1) 00I 00I SRS control module (N2/2) 23 O Driver AB squi (R12/3) 23 O 3.0, Left front ETR squi (R12/1) 23 O 5.0, Right front ETR squi (R12/2) 23 O 7.0, Front passenger AB squi (R12/8) 23 O 9.0, Left side airag squi (R12/9) 23 O 15.0, Right side airag squi (R12/10) 23 O 17.0, I I6, 0I7 026, Programming does not comply with vehicle version 31.0, verify vehicle version, repeat programming. 0I7 003 Circuit 15R, voltage supply (low voltage) 23 O 1.0 0I9 002 SRS MIL (A1e15) 23 O Front passenger seat occupied recognition sensor (B41/1) 2) or (B48) 23 O ) Oserve Preparation for Test, see 22. 2) As of model introduction I, other models as of approx. 06/96 Diagnostic Manual Body and Accessories 11/ AB 12/3

8 Diagnosis - Diagnostic Troule Code (DTC) Memory (driver/passenger-side airag/side airag) DTC A with fault code 1 with fault code 2 Possile cause Test step/remedy 1) 024 I 0I6 I Left front seat elt uckle switch (AB/ETR) (S68/3) 23 O I 0I7 I Right front seat elt uckle switch (AB/ETR) (S68/4) 23 O Squi short circuit ( ±) (to each other) 23 O I8 Left side airag (A53), harness fault 23 O I9 Left side air ag (A53), sensor defective Replace sensor 020 Left side air ag (A53), sensor defective Replace sensor 02I Right side airag (A54) 23 O Right side airag (A54), sensor defective Replace sensor 023 Right side airag (A54), sensor defective Replace sensor 027 Front passenger seat occupied recognition with automatic child seat recognition (B48) (ACSR), communication, //, ± 028 Front passenger seat occupied recognition with automatic child seat recognition (B48) (ACSR), Improperly positioned child seat or faulty, Connection etween passenger seat and child seat faulty, B48, Metallic ojects on passenger seat or child seat, Short term electromagnetic interference in immediate area such as electronic transmitters, telephones etc. 23 O 20.0 Position child seat properly or replace, Replace B48 1) Oserve Preparation for Test, see 22. Diagnostic Manual Body and Accessories 11/ AB 12/4

9 Diagnosis - Diagnostic Troule Code (DTC) Memory (driver/passenger-side airag/side airag) DTC A with fault code 1 with fault code 2 03I Possile cause Test step/remedy 1) Front passenger seat occupied recognition with automatic child seat recognition (B48) (ACSR) Replace B Left side airag (A53), communication interference Electromagnetic interference, check harness routing if accessories installed 2) 033 Right side airag (A54), communication interference Electromagnetic interference, check harness routing if accessories installed 2) 034 Digital crash output, harness fault (TELE AID) 3) 035 Analoge crash output, harness fault (model 170 Kompressor) 1) Oserve Preparation for Test, see 22. 2) Oserve clearances near sensors, if additional accessories are eing installed. 3) Currently only on model 170 Diagnostic Manual Body and Accessories 11/ AB 12/5

10 Diagnosis - Diagnostic Troule Code (DTC) Memory (driver/passenger-side airag/side airag) a CAUTION! Risk of Injury when performing Diagnostic Tests and repairs on components of the SRS system. Store oth airags and side airags with opening surface pointing upward. Do not expose to temperatures aove 100 C. Interrupt any electrical current from reaching the airag unit. a CAUTION! Risk of injury if airag units and ETR units are ignited accidentally or if stored with the opening end facing downward which may cause the accidentally ignited components to fly aout causing injury. Danger to persons also exists if the components are disposed of y cutting apart with cutting torches or other cutting/separation devices. Danger also exists if disposing the untriggered units via refuse collection or via smelting/caronizing companies. Protective measures/supervision - Place removed airag unit with the opening side facing upward. - Allow only properly trained dealer staff to supervise, purchase, transport, store, test/replace any of the SRS components. - Install all airag or ETR units once pulled from the parts department. - Protect all airag or ETR units from any sparks, open flame, or temperatures aove 100 C. - Do not transport airag or ETR units in the passenger compartment, rather transport securely in their original packaging in the trunk. - Do not allow oil, grease or cleaning agents come in contact with the airag or ETR units - Perform SRS tests only with approved test equipment (such as HHT), while installed in the vehicle without occupants. - When reconnecting the vehicle attery or any outside electrical source, with the ignition turned ON, do not allow any occupants inside the vehicle. - Airag or ETR units which have een dropped from a height greater than 18 inches must e replaced. - Prior to disposing the airag or ETR units, the units must e made unuseale y discharging. - In order to render the airag and ETR unit un-useale, the specially made discharge harness must e used and at the same time maintain a safe distance of at least 33 feet from the units eing discharged. Prior to undertaking any chassis/ody repairs, installation/repair work on airag and ETR units, or any components which come in contact with the airag and ETR units, or are part of the electrical circuit of airag and ETR units (such as installation of the steering wheel), the following conditions must e met: - Remove ignition key. - Disconnect any outside source of elctrical circuit (i.e. attery charger). - When performing interior repairs or welding operations, disconnect the connector from the SRS control module. Preparation for DTC readout for Lower Control Field Control Module (N72) follows on next page. Diagnostic Manual Body and Accessories 11/ AB 12/6

11 Diagnosis - Diagnostic Troule Code (DTC) Memory (driver/passenger-side airag/side airag) Preparation for DTC readout for Lower Control Field Control Module (N72) only 1. Connect Hand-Held Tester (HHT) as per connection diagram, see section 0, and readout DTC memory for lower control field control module (N72), 2. Review 12, 13, 2. Listed elow are only the DTC's pertaining to SRS, 3. Fuses OK, 4. Battery voltage V, 5. SRS MIL (A1e15) illuminates. DTC A Possile cause Test step/remedy 1) B I558 B I559 Automatic child seat recognition warning lamp (N72e1) ±$ short circuit to ground, // open circuit ACSR signal line ±$ short circuit to ground 23 O O ) Oserve Preparation for Test, see 22. Diagnostic Manual Body and Accessories 11/ AB 12/7

12 Diagnosis - Fault Frequency, Time Span (driver/passenger-side airag/side airag) For each fault a fault time span is provided, showing start and end of fault Example: Periodic Faults: Fault frequency: Fault noted 4 times. AB DTC Memory Time span since the first fault is: 6 h. 11 min. 14 sec. Time span since last fault noted is: 4 h. 35 min. 12 sec. Fault Frequency 4 Time span since first fault is: 6 h. 11 min. 14 sec. Time span since last fault noted is: 4 h. 35 min. 12 sec. B Fault Frequency (count) Time span (h, min, sec.) 0 Fault not present. BFU: Start of Fault Time Span. 1, 2, 3, 4 Fault present (occured 4 times, did not occur 4 times). EFU: End of Fault Time Span. U JH Diagnostic Manual Body and Accessories 11/ AB 13/1

13 Diagnosis - Actual Values (driver/passenger-side airag/side airag) Four displays are possile:, F, ON, OFF. : Noted values are within the nominal values. F : Noted values are outside the nominal values. ON: Seat elt uckle latched I, front passenger seat occupied, MB "Baysafe" child seat recognized. OFF: Seat elt uckle not latched I, front passenger seat not occupied, MB "Baysafe" child seat not recognized. Contrary to DTC memory, actual values are updated continuously, even during diagnosis. This allows intermittent faults to e recognized y moving/shaking components, connectors or wiring harnesses. Control Module Versions Information regarding the AB control modules and Side airag sensors can e readout: Model Manufacture location Manufacture date Daily manufacture numer (as of 12/96 only) Diagnostic Manual Body and Accessories 11/ AB 14/1

14 Diagnosis - Complaint Related Diagnostic Chart (driver/passenger-side airag/side airag) a CAUTION! Risk of Injury when performing Diagnostic Tests and repairs on components of the SRS system. Store oth airags and side airags with opening surface pointing upward. Do not expose to temperatures aove 100 C. Interrupt any electrical current from reaching the airag unit. a CAUTION! Risk of injury if airag units and ETR units are ignited accidentally or if stored with the opening end facing downward which may cause the accidentally ignited components to fly aout causing injury. Danger to persons also exists if the components are disposed of y cutting apart with cutting torches or other cutting/separation devices. Danger also exists if disposing the untriggered units via refuse collection or via smelting/caronizing companies. Protective measures/supervision - Place removed airag unit with the opening side facing upward. - Allow only properly trained dealer staff to supervise, purchase, transport, store, test/replace any of the SRS components. - Install all airag or ETR units once pulled from the parts department. - Protect all airag or ETR units from any sparks, open flame, or temperatures aove 100 C. - Do not transport airag or ETR units in the passenger compartment, rather transport securely in their original packaging in the trunk. - Do not allow oil, grease or cleaning agents come in contact with the airag or ETR units - Perform SRS tests only with approved test equipment (such as HHT), while installed in the vehicle without occupants. - When reconnecting the vehicle attery or any outside electrical source, with the ignition turned ON, do not allow any occupants inside the vehicle. - Airag or ETR units which have een dropped from a height greater than 18 inches must e replaced. - Prior to disposing the airag or ETR units, the units must e made unuseale y discharging. - In order to render the airag and ETR unit un-useale, the specially made discharge harness must e used and at the same time maintain a safe distance of at least 33 feet from the units eing discharged. Prior to undertaking any chassis/ody repairs, installation/repair work on airag and ETR units, or any components which come in contact with the airag and ETR units, or are part of the electrical circuit of airag and ETR units (such as installation of the steering wheel), the following conditions must e met: - Remove ignition key. - Disconnect any outside source of electrical circuit (i.e. attery charger). - When performing interior repairs or welding operations, disconnect the connector from the SRS control module. Diagnostic Manual Body and Accessories 11/ AB 15/1

15 Diagnosis - Complaint Related Diagnostic Chart (driver/passenger-side airag/side airag) Preparation for Test: 1. Review 11, 12, 13, 20, 21, 22, 23, 31, 32 Complaint/Prolem Possile cause Test step/remedy SRS MIL (A1e15) with ignition key in position 1 : does not come on does not go out after approximately 4 20 seconds flickers comes on for 2 minutes remains illuminated continuously DTC Memory 12 SRS MIL (A1e15) links with ignition key in position 1, after the control module has een replaced. Automatic child seat recognition warning lamp (N72e1) (AIRBAG OFF), Automatic child seat recognition (ACSR) indicator lamp (E16), does not illuminate and does not go out, (MB "Baysafe" seat NOT installed). SRS control module not reprogrammed. Automatic child seat recognition warning lamp (N72e1) (AIRBAG OFF), Automatic child seat recognition (ACSR) indicator lamp (E16, N72e1), Transponder system in child seat, Seat occupied recognition transponder with child seat recognition (B48), SRS control module Control Module Programming Programming Vehicle Equipment 31 Setting Parameters Diagnostic Manual Body and Accessories 11/ AB 15/2

16 Diagnosis - Complaint Related Diagnostic Chart (driver/passenger-side airag/side airag) Complaint/Prolem Possile cause Test step/remedy Automatic child seat recognition warning lamp (N72e1) (AIRBAG OFF), Automatic child seat recognition (ACSR) indicator lamp (E16), does not illuminate, (MB "Baysafe" seat IS installed). Automatic child seat recognition warning lamp (N72e1) (AIRBAG OFF), Automatic child seat recognition (ACSR) indicator lamp (E16, N72e1), Transponder system in child seat, Seat occupied recognition transponder with child seat recognition (B48), SRS control module Diagnostic Manual Body and Accessories 11/ AB 15/3

17 Electrical Test Program - Component Locations Driver/passenger-side airag/side airag Model 129 Figure 1 A1e15 SRS MIL A45 Horn/airag clock spring contact A45x1 Horn/airag clock spring contact connector A53 Left side airag sensor A54 Right side airag sensor B41/1 Front passenger seat occupied recognition sensor B48 Front passenger seat occupied recognition with automatic child seat recognition (ASCR) E16 Automatic child seat recognition (ASCR) indicator lamp N2/2 SRS control module R12/1 Left front ETR squi R12/2 Right front ETR squi R12/3 Driver airag squi R12/8 Front passenger airag squi R12/9 Left side airag squi R12/10 Right side airag squi S68/3 Left front seat elt uckle switch (airag/etr) I S68/4 Right front seat elt uckle switch (airag/etr) I P Diagnostic Manual Body and Accessories 11/ AB 20/1

18 Electrical Test Program - Component Locations Driver/passenger-side airag/side airag Model 140 Figure 2 A1e15 A45 A53 A54 B48 E16 SRS MIL Horn/airag clock spring contact Left side airag sensor Right side airag sensor Front passenger seat occupied recognition with automatic child seat recognition (ASCR) Automatic child seat recognition (ASCR) indicator lamp N2/2 SRS control module R12/1 Left front ETR squi R12/2 Right front ETR squi R12/3 Driver airag squi R12/8 Front passenger airag squi R12/9 Left side airag squi R12/10 Right side airag squi S68/3 Left front seat elt uckle switch (airag/etr) I S68/4 Right front seat elt uckle switch (airag/etr) I P Diagnostic Manual Body and Accessories 11/ AB 20/2

19 Electrical Test Program - Component Locations Driver/passenger-side airag/side airag Model 170, 208 Figure 3 A1e15 SRS MIL A45 Horn/airag clock spring contact A53 Left side airag sensor A54 Right side airag sensor B48 Front passenger seat occupied recognition with automatic child seat recognition (ACSR) E16 Automatic child seat recognition (ASCR) indicator lamp K56 Crash separation relay module (generator/attery) (Kompressor model only) N2/2 SRS control module N72e1 Automatic child seat recognition warning lamp R12/1 Left front ETR squi R12/2 Right front ETR squi R12/3 Driver airag squi R12/8 Front passenger airag squi R12/9 Left side airag squi R12/10 Right side airag squi S68/3 Left front seat elt uckle switch (airag/etr) I S68/4 Right front seat elt uckle switch (airag/etr) I P Diagnostic Manual Body and Accessories 11/ AB 20/3

20 Electrical Test Program - Component Locations Driver/passenger-side airag/side airag Model 202 As of 07/97 Figure 4 A1e15 SRS MIL A45 Horn/airag clock spring contact A53 Left side airag sensor A54 Right side airag sensor B48 Front passenger seat occupied recognition with automatic child seat recognition (ACSR) N2/2 SRS control module N72e1 Automatic child seat recognition warning lamp R12/1 Left front ETR squi R12/2 Right front ETR squi R12/3 Driver airag squi R12/8 Front passenger airag squi R12/9 Left side airag squi R12/10 Right side airag squi S68/3 Left front seat elt uckle switch (airag/etr) I S68/4 Right front seat elt uckle switch (airag/etr) I P Diagnostic Manual Body and Accessories 11/ AB 20/4

21 Electrical Test Program - Component Locations Driver/passenger-side airag/side airag Model 210 Up to 03/97 With seat occupied recognition (SOR) Figure 5 A1e15 A45 A53 A54 SRS MIL Horn/airag clock spring contact Left side airag sensor Right side airag sensor B41/1 Front passenger seat occupied recognition sensor N2/2 SRS control module R12/1 Left front ETR squi R12/2 Right front ETR squi R12/3 Driver airag squi R12/8 Front passenger airag squi R12/9 Left side airag squi R12/10 Right side airag squi S68/3 Left front seat elt uckle switch (airag/etr) I S68/4 Right front seat elt uckle switch (airag/etr) I P Diagnostic Manual Body and Accessories 11/ AB 20/5

22 Electrical Test Program - Component Locations Driver/passenger-side airag/side airag Model 210 As of 03/97 and up to 07/98 Figure 5 A1e15 SRS MIL A45 Horn/airag clock spring contact A53 Left side airag sensor A54 Right side airag sensor B48 Front passenger seat occupied recognition with automatic child seat recognition (ACSR) N2/2 SRS control module N72e1 Automatic child seat recognition warning lamp R12/1 Left front ETR squi R12/2 Right front ETR squi R12/3 Driver airag squi R12/8 Front passenger airag squi R12/9 Left side airag squi R12/10 Right side airag squi S68/3 Left front seat elt uckle switch (airag/etr) I S68/4 Right front seat elt uckle switch (airag/etr) I P Diagnostic Manual Body and Accessories 11/ AB 20/6

23 Electrical Test Program Connection of Components Driver/passenger-side airag/side airag/passenger seat occupied recognition with child seat recognition Shown on Model 170 i E16 Automatic child seat recognition (ASCR) indicator lamp not shown (however like N72e1). Figure 1 A1e15 SRS MIL A53 Left side airag sensor A54 Right side airag sensor B41/1 Front passenger seat occupied recognition sensor B48 Front passenger seat occupied recognition with automatic child seat recognition (ACSR) (model 170 only) K56 Crash separation relay module (generator/attery) (Kompressor model only) N2/2 SRS control module N72e1 Automatic child seat recognition warning lamp R12/1 Left front ETR squi R12/2 Right front ETR squi R12/3 Driver airag squi R12/8 Front passenger airag squi R12/9 Left side airag squi R12/10 Right side airag squi S68/3 Left front seat elt uckle switch (airag/etr) I S68/4 Right front seat elt uckle switch (airag/etr) I X11/4 Data link connector (DTC readout) P Diagnostic Manual Body and Accessories 11/ AB 21/1

24 Electrical Test Program - Preparation for Test (driver/passenger-side airag/side airag) Preliminary work: Diagnosis - Diagnostic Troule Code (DTC) Memory Diagnosis - Fault Frequency, Time Span Diagnosis - Actual Values a CAUTION! Risk of injury if airag units and ETR units are ignited accidentally or if stored with the opening end facing downward which may cause the accidentally ignited components to fly aout causing injury. Danger to persons also exists if the components are disposed of y cutting apart with cutting torches or other cutting/separation devices. Danger also exists if disposing the untriggered units via refuse collection or via smelting/caronizing companies. Protective measures/supervision - Place removed airag unit with the opening side facing upward. - Allow only properly trained dealer staff to supervise, purchase, transport, store, test/replace any of the SRS components. - Install all airag or ETR units once pulled from the parts department. - Protect all airag or ETR units from any sparks, open flame, or temperatures aove 100 C. - Do not transport airag or ETR units in the passenger compartment, rather transport securely in their original packaging in the trunk. - Do not allow oil, grease or cleaning agents come in contact with the airag or ETR units - Perform SRS tests only with approved test equipment (such as HHT), while installed in the vehicle without occupants. Electrical Wiring Diagrams: Electrical Trouleshooting Manual, Model 129, Vol. 2, group 91, Electrical Trouleshooting Manual, Model 140, Vol. 2, group 91, Electrical Trouleshooting Manual, Model 170, Vol. 2, group 91, Electrical Trouleshooting Manual, Model 202/208 Vol. 2, group 91, Electrical Trouleshooting Manual, Model 210, Vol. 2, group 91 - When reconnecting the vehicle attery or any outside electrical source, with the ignition turned ON, do not allow any occupants inside the vehicle. - Airag or ETR units which have een dropped from a height greater than 18 inches must e replaced. - Prior to disposing the airag or ETR units, the units must e made unuseale y discharging. - In order to render the airag and ETR unit un-useale, the specially made discharge harness must e used and at the same time maintain a safe distance of at least 33 feet from the units eing discharged. Prior to undertaking any chassis/ody repairs, installation/repair work on airag and ETR units, or any components which come in contact with the airag and ETR units, or are part of the electrical circuit of airag and ETR units (such as installation of the steering wheel), the following conditions must e met: - Remove ignition key. - Disconnect any outside source of elctrical circuit (i.e. attery charger). - When performing interior repairs or welding operations, disconnect the connector from the SRS control module. Diagnostic Manual Body and Accessories 11/ AB 22/1

25 Electrical Test Program - Preparation for Test (driver/passenger-side airag/side airag) Preparation for Test (continued): 1. Review section 0, 11, 12, 13, 20, 21, 22, 23, 31, Check fuses. 3. Battery voltage > 11 V. 4. Insert vehicle specific test module into Hand-Held Tester (HHT). 5. Connect (HHT) as per connection diagram, see section 0 a CAUTION! Do not connect attery trickle charger. Initial Display Display appears approximately 5 seconds after the HHT is connected to the vehicle (example: Model 140). 140 a XXXX XXXX XX XX/XX Model No. and Version Pressing the return ( ) key will start the test program. Further information on use of the HHT will now appear on the display. Diagnostic Manual Body and Accessories 11/ AB 22/2

26 Electrical Test Program - Preparation for Test (driver/passenger-side airag/side airag) Special Tools Electrical connecting set 35-pin socket ox Test cale Test cale Ohm decade 36-pin test cale Adapter cale Adapter cale Test equipment; See MBUSA Standard Service Equipment Program Description Brand, model, etc. Digital multimeter Fluke models 23, 77 III, 83, 85, 87 Diagnostic Manual Body and Accessories 11/ AB 22/3

27 Electrical Test Program - Preparation for Test (driver/passenger-side airag/side airag) Shop-made Test Cales for connecting Airag Squis Parts Required for Test: 1 Connection piece Connector Wire with 2.5 mm socket (from electrical connector set) 2 Wire with 2.5 mm pin (from electrical connector set) a CAUTION! All red colored connectors and connections of the airag squis are constructed with a short-circuiting ridge. Upon disconnecting, the squi wire and squi are automatically short-circuited, to prevent airag deployment. Review corresponding ETM document for each model for location/identification of Airag Squis and also prior to connecting any test cales. Thus all repairs can e accomplished with only the ignition key removed. a CAUTION! The attery minus cale must e disconnected and covered, as well as the SRS control module (N2/2) disconnected prior to use of any electrical welding equipment. Additionally, the previously used SRS test connection is no longer present. Model pole connector, (X11/13, Figure 2) etween cockpit and frame floor. Models 202, pole connector, (X28/12, Figure 4) for front passenger airag etween cockpit and frame floor. Models 170, pole connectors, (X35/1 [left front door separation point], X35/2 [right front door separation point]) for left/right side airag. Accessories (for vehicles with ASCR installed only): Child seat "Baysafe" Diagnostic Manual Body and Accessories 11/ AB 22/4

28 Electrical Test Program - Preparation for Test (driver/passenger-side airag/side airag) Connection Diagram - Socket Box Tester/SRS Control Module Connector Figure Test cale 003 Multimeter 004 Socket ox (36-pole socket ox shown as example) 1 SRS control module connector 2 Connect and disconnect aid 3 Connect and disconnect lock P Diagnostic Manual Body and Accessories 11/ AB 22/5

29 Electrical Test Program - Preparation for Test (driver/passenger-side airag/side airag) Model 140 (as of 07/93) Connection Diagram - Socket Box Tester/SRS Control Module Connection (10-pole) Figure Test cale 003 Multimeter 004 Socket ox 050 Socket ox X11/13 SRS test connection (10-pole) P Diagnostic Manual Body and Accessories 11/ AB 22/6

30 Electrical Test Program - Preparation for Test (driver/passenger-side airag/side airag) Connection Diagram - Test Cales/Squi Plug Connections Model 129 as of 07/93 Model 140 as of 07/93 Model 202 as of 07/93 Model 170, 208 Model 210 up to 03/97 Figure Test cales with anana plugs 038 Resisitance sustitution unit 1 Short circuit ridge 2 Connector, part no Test cales with 2.5 mm sockets A45x1 Horn/airag clock spring contact connector X28/8 ETR connector (left seat plug connection) (2-pole) X28/9 ETR connector (right seat plug connection) (2-pole) X28/12 Passenger airag connector X35/1 Left front door separation point X35/2 Right front door separation point X35/41 Left front door separation point X35/42 Right front door separation point P Diagnostic Manual Body and Accessories 11/ AB 22/7

31 Electrical Test Program - Preparation for Test (driver/passenger-side airag/side airag) Connection Diagram - Test Cales/Squi Plug Connections Model 210 as of 03/97 up to 06/99 with windowag and side airag in rear Figure Test cales with anana plugs 038 Resistance sustitution unit 1 Short circuit ridge 2 Connector, part no Test cales with 2.5 mm sockets X28/23 AB driver/passenger connector P Diagnostic Manual Body and Accessories 11/ AB 22/8

32 Electrical Test Program - Preparation for Test (driver/passenger-side airag/side airag) Connection Diagram - Resistance Sustitution Unit/Squi Connectors Review corresponding ETM document for each model for location/identification of Airag Squis and also prior to connecting any test cales. Figure Test cale, part no Test cales with anana plugs 038 Resistance sustitution unit R12/1 Left front ETR squi R12/2 Right front ETR squi R12/3 Driver AB squi R12/8 Front passenger AB squi R12/9 Left side airag squi R12/10 Right side airag squi P Diagnostic Manual Body and Accessories 11/ AB 22/9

33 Electrical Test Program - Preparation for Test (driver/passenger-side airag/side airag) Connection Diagram - Side Airag Sensors Model 129 as of 07/93, with front side airag Model 140 as of 07/93, with front side airag Model 202 as of 07/93, with front side airag Model 170, 208, with front side airag Model 210 up to 05/98 with front side airag Figure Test cale, part no Multimeter A53 Left side airag sensor A54 Right side airag sensor P Diagnostic Manual Body and Accessories 11/ AB 22/10

34 Electrical Test Program - Preparation for Test (driver/passenger-side airag/side airag) Connection Diagram - Resistance Sustitution Unit with Diode for Simulation of Seat Occupation Recognition Model 140 as of 07/93 Model 202 as of 07/93 Model 170 Model 210 up to 03/97 Figure Test cale, part no Test cale with anana plugs 038 Resistance sustitution unit 1N4007 Diode X55/3 Left ESA connector lock X55/4 Right ESA connector lock P Diagnostic Manual Body and Accessories 11/ AB 22/11

35 Electrical Test Program - Preparation for Test (driver/passenger-side airag/side airag) Connection Diagram - Resistance Sustitution Unit with Diode for Simulation of Seat Occupation Recognition Model 129 asof 07/93 Figure Test cale, part no Test cale with anana plugs 038 Resistance sustitution unit 1N4007 Diode X28/18 Occupied seat recognition connector/acsr P Diagnostic Manual Body and Accessories 11/ AB 22/12

36 Electrical Test Program - Test (driver/passenger-side airag/side airag) O A Test scope/ Actual value no. and text 1.0 0I7 003 Circuit 15R voltage supply Low voltage/ 07 Voltage Test connection Test condition Nominal value/ A display A Ignition key in position 2. Possile cause/remedy F Wiring, Battery I SRS control module (N2/2) A Ignition key in position 2. N2/ Driver AB squi (RI2/3) > ] < ] A Ignition key in position 2. F O Driver AB squi (RI2/3) 1 w R12/3 B A L 2 Remove ignition key. Remove driver airag. Disconnect driver AB squi (R12/3). Connect B ( 22, Figure 5). Set resistance of 2 ]. Ignition key in position 2. F Driver airag unit. O 3.2 Diagnostic Manual Body and Accessories 11/ AB 23/1

37 Electrical Test Program - Test (driver/passenger-side airag/side airag) O A Test scope/ Actual value no. and text Driver AB squi (RI2/3) > ] < ] (except for Model 202 as of 06/97, Model 210 as of 03/97). (Model 202 as of 07/97, Model 210 as of 04/97). Test connection Test condition Nominal value/ A display 1 w 1 w A45x1 B X28/23 B A L 2 L 2 Remove ignition key. Connect B ( 22, Figure 4). Set resistance of 2 ]. Ignition key in position 2. F Possile cause/remedy Check horn/airag clock spring contact (A45) for continuity. O 3.4 Model 140: O Driver AB squi (RI2/3) > ] < ] 3 w X11/3 k L 4 Remove ignition key. Connect k ( 22, Figure 2). 2 5 ] Wiring, O 3.4 Model 140 as of 07/97 only 3.4 Driver AB squi (R12/3) > ] < ] 10 w N2/2 k L 11 Remove ignition key. Disconnect N2/2 connector. Connect k ( 22, Figure 1). 2 5 ] Wiring. Diagnostic Manual Body and Accessories 11/ AB 23/2

38 Electrical Test Program - Test (driver/passenger-side airag/side airag) O A Test scope/ Actual value no. and text Driver AB squi (RI2/3) ±$ ±+ Test connection Test condition Nominal value/ A display 6 w 5 w N2/2 k L 11 L 11 A not connected. Remove ignition key. Disconnect N2/2 connector. Connect k ( 22, Figure 1). >20 k] >20 k] Possile cause/remedy Wiring, Short to circuit 31, 30, 15, 15R Left front ETR squi (RI2/I) > ] < ] A Ignition key in position 2. F O Left front ETR squi (RI2/I) 1 w R12/1 B A L 2 Remove ignition key. Disconnect left front ETR squi (R12/1) connector. Connect B ( 22, Figure 5). Set resistance of 2 ]. F Seat elt retractor. O 5.2 Ignition key in position 2. Diagnostic Manual Body and Accessories 11/ AB 23/3

39 Electrical Test Program - Test (driver/passenger-side airag/side airag) O A Test scope/ Actual value no. and text Left front ETR squi (RI2/I) > ] < ] Test connection Test condition Nominal value/ A display 1 w N2/2 k L 2 Remove ignition key. Disconnect N2/2 connector. Connect k ( 22, Figure 1). 2 5 ] Wiring. Possile cause/remedy Model 129: ETR connector (left seat plug connection, X28/8) not properly connected Left front ETR squi (RI2/I) ±$ ±+ 6 w 5 w N2/2 k L 1 L 1 A not connected. Remove ignition key. Disconnect N2/2 connector. Connect k ( 22, Figure 1). >20 k] >20 k] Wiring, Short to circuit 31, 30, 15, 15R Right front ETR squi (RI2/2) > ] < ] A Ignition key in position 2. F O 7.1 Diagnostic Manual Body and Accessories 11/ AB 23/4

40 Electrical Test Program - Test (driver/passenger-side airag/side airag) O A Test scope/ Actual value no. and text Right front ETR squi (RI2/2) Test connection Test condition Nominal value/ A display 1 w R12/2 B A L 2 Remove ignition key. Disconnect right front ETR squi (R12/2) connector. Connect B ( 22, Figure 5). Set resistance of 2 ]. Ignition key in position 2. F Possile cause/remedy Seat elt retractor. O Right front ETR squi (RI2/2) > ] < ] 3 w N2/2 k L 4 Remove ignition key. Disconnect N2/2 connector. Connect k ( 22, Figure 1). 2 5 ] Wiring. Model 129: ETR connector (right seat plug connection, X28/9) not properly connected Right front ETR squi (RI2/2) ±$ ±+ 6 w 5 w N2/2 k L 4 L 4 A not connected. Remove ignition key. Disconnect N2/2 connector. Connect k ( 22, Figure 1). >20 k] >20 k] Wiring, Short to circuit 31, 30, 15, 15R. Diagnostic Manual Body and Accessories 11/ AB 23/5

41 Electrical Test Program - Test (driver/passenger-side airag/side airag) O A Test scope/ Actual value no. and text Front passenger AB squi (RI2/8) > ] < ] Test connection Test condition Nominal value/ A display A Ignition key in position 2. Possile cause/remedy F O Front passenger AB squi (RI2/8) 1 w R12/8 B A L 2 Remove ignition key. Remove glove ox. Disconnect front passenger AB squi (R12/8) connector. Connect B ( 22, Figure 5). Set resistance of 2 ]. Ignition key in position 2. F Front passenger airag unit. Model 140: SRS test connector (X11/13) not properly connected. Model 202: Airag intermediate connector (X28/12) not properly connected. Model 140 O 9.2, except Model 129, 140, 210 as of 03/97: O 9.3, All models: O Right front ETR squi (RI2/8) > ] < ] 5 w X11/13 k L 6 Remove ignition key. Disconnect X11/13. Connect k ( 22, Figure 2). 2 5 ] Wiring, O 9.4 Diagnostic Manual Body and Accessories 11/ AB 23/6

42 Electrical Test Program - Test (driver/passenger-side airag/side airag) O A Test scope/ Actual value no. and text Test connection Test condition Nominal value/ A display Possile cause/remedy Right front ETR squi (RI2/8) 1 w X28/12 B L 2 Remove ignition key. Disconnect X28/12. Connect B ( 22, Figure 4). Set resistance of 2 ]. Ignition key in position 2. F Wiring, O Front passenger AB squi (RI2/8) > ] < ] 13 w N2/2 k L 14 Remove ignition key. Disconnect N2/2 connector. Connect k ( 22, Figure 1). 2 5 ] Wiring Front passenger AB squi (RI2/8) ±$ ±+ 6 w 5 w N2/2 k L 14 L 14 A not connected. Remove ignition key. Disconnect N2/2 connector. Connect k ( 22, Figure 1). >20 k] >20 k] Wiring, Short to circuit 31, 30, 15, 15R. Diagnostic Manual Body and Accessories 11/ AB 23/7

43 Electrical Test Program - Test (driver/passenger-side airag/side airag) O A 1) Test scope/ Actual value no. and text Test connection Test condition Nominal value/ A display Possile cause/remedy I I SRS MIL (AIeI5) // ±+ A Ignition key in position 2. A1e15 comes on. A1e15 goes out after approx. 4 sec. F Wiring, A1e15 shorted to I6 09 Left front seat elt uckle switch (S68/3) // I only A Ignition key in position 2. Seat elt uckle not latched. Seat elt uckle latched. OFF ON F Wiring, Open/short circuit to circuit 31, Left ESA connector lock (X55/3) not properly connected Left front seat elt uckle switch (S68/3) I only ±$ 6 w N2/2 k L 12 Remove ignition key. Disconnect N2/2 connector. Connect k ( 22, Figure 1). A not connected. Wiring, Short to circuit 31, 30, 15, 15R, Seat elt uckle. ±+ 5 w L 12 Seat elt uckle not latched. Seat elt uckle latched. Seat elt uckle not latched. Seat elt uckle latched ] ] > 20 k] > 20 k] 1) A DTC is recognized within 4 seconds after the ignition key is turned to position 2, or if a fault is present. Diagnostic Manual Body and Accessories 11/ AB 23/8

44 Electrical Test Program - Test (driver/passenger-side airag/side airag) O A1) Test scope/ Actual value no. and text I7 08 Right front seat elt uckle switch (S68/4) // I only Test connection Test condition Nominal value/ A display A Ignition key in position 2. Seat elt uckle not latched. Seat elt uckle latched. OFF ON F Possile cause/remedy Wiring, Open/short circuit to circuit 31, Right ESA connector lock (X55/4) not properly connected Right front seat elt uckle switch (S68/4) I only ±$ 6 w N2/2 k L 8 Remove ignition key. Disconnect N2/2 connector. Connect k ( 22, Figure 1). A not connected. Seat elt uckle not latched ] ] Wiring, Short to circuit 31, 30, 15, 15R, Seat elt uckle. ±+ 5 w L 8 Seat elt uckle latched. > 20 k] 1) A DTC is recognized within 4 seconds after the ignition key is turned to position 2, or if a fault is present. Diagnostic Manual Body and Accessories 11/ AB 23/9

45 Electrical Test Program - Test (driver/passenger-side airag/side airag) O A1) Test scope/ Actual value no. and text Test connection Test condition Nominal value/ A display Possile cause/remedy Squis < ] > ] R12/1 R12/2 R12/3 R12/8 Squis in series ± R12/1 R12/2 R12/1 R12/3 R12/1 R12/8 R12/2 R12/3 R12/2 R12/8 R12/3 R12/8 1 w 3 w 10 w 13 w 1 w 1 w 1 w 3 w 3 w 10 w N2/2 k L 2 L 4 L 11 L 14 L 3 L 10 L 13 L 10 L 13 L 13 Remove ignition key. Disconnect N2/2 connector. Connect k ( 22, Figure 1). A not connected. 2 5 ] 2 5 ] 3 5 ] 2 5 ] > 20 k] > 20 k] > 20 k] > 20 k] > 20 k] > 20 k] Wiring, Short circuit I0 Left side airag squi (RI2/9) > ] < ] (only with left/right side airag equipped vehicles) A A connected. Ignition key in position 2. F O ) A DTC is recognized within 4 seconds after the ignition key is turned to position 1, or if a fault is present. Diagnostic Manual Body and Accessories 11/ AB 23/10

46 Electrical Test Program - Test (driver/passenger-side airag/side airag) O A1) Test scope/ Actual value no. and text Test connection Test condition Nominal value/ A display Possile cause/remedy I0 Left side airag squi (RI2/9) (except Model 202 as of 06/97, Model 210 as of 03/97, Model 208) 1 w X35/1 B A L 2 Remove ignition key. Disconnect left front door separation point. Connect B ( 22, Figure 4). Set resistance of 2 ]. Ignition key in position 2. F O 15.2 (Model 202 as of 07/97, Model 210 as of 03/97, Model 208) 1 w X35/41 B A L I0 Left side airag squi (RI2/9) 1 w R12/9 B A L 2 Remove ignition key. Remove interior door panel. Connect B ( 22, Figure 5). Set resistance of 2 ]. Ignition key in position 2. F Left side airag, O I0 Left side airag squi (RI2/9) > ] < ] 16 w N2/2 k L 17 Remove ignition key. Disconnect N2/2 connector. Connect k ( 22, Figure 1). 2 5 ] Wiring, Contacts. 1) A DTC is recognized within 4 seconds after the ignition key is turned to position 1, or if a fault is present. Diagnostic Manual Body and Accessories 11/ AB 23/11

47 Electrical Test Program - Test (driver/passenger-side airag/side airag) O A Test scope/ Actual value no. and text Test connection Test condition Nominal value/ A display Possile cause/remedy I0 Left side airag squi (RI2/9) ±$ ±+ 6 w 5 w N2/2 k L 16 L 16 A connected. Remove ignition key. Disconnect N2/2 connector. Connect k ( 22, Figure 1). >20 k] >20 k] Wiring, Short to circuit 31, 30, 15, 15R I8 0I2 Left side airag sensor (A53) Voltage supply (only with left/right side airag equipped vehicles). 1 w A53 c L 3 Disconnect connector at A53. Connect test cale: ( 22, Figure 6) V Wiring I8 0I2 Left side airag sensor (A53) Wiring fault N2/2 k 20 w A53 L 3 Connect k ( 22, Figure 6). <1 ] Wiring. Diagnostic Manual Body and Accessories 11/ AB 23/12

48 Electrical Test Program - Test (driver/passenger-side airag/side airag) O A1) Test scope/ Actual value no. and text I2 Left side airag sensor (A53) Insulation fault ±$ Test connection Test condition Nominal value/ A display 6 w 5 w N2/2 k L 20 L 20 Connect k ( 22, Figure 5). Disconnect connector at A53. >20 k] >20 k] Possile cause/remedy Wiring shorted to circuit 31 Wiring shorted to circuit 30, 15, 15R I0 Right side airag squi (RI2/I0) > ] < ] A Ignition key in position 2. F O 17.1 (only with left/right side airag equipped vehicles) I0 Right side airag squi (RI2/I0 (except model 202 as of 06/97, Model 210 as of 03/97, Model 208) (Model 202 as of 07/97, Model 210 as of 03/97, Model 208) 1 w 1 w X35/1 B A X35/42 B A L 2 L 2 Remove ignition key. Disconnect left door separation point connector. connector. Set resistance of 2 ]. ( 22, Figure 3). Ignition key in position 2. F O ) A DTC is recognized within 4 seconds after the ignition key is turned to position 1, or if a fault is present. Diagnostic Manual Body and Accessories 11/ AB 23/13