ASE 6 - Electrical Electronic Systems. Module 16 Lighting Systems
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1 Electronic Systems Module 16
2 Acknowledgements General Motors, the IAGMASEP Association Board of Directors, and Raytheon Professional Services, GM's training partner for GM's Service Technical College wish to thank all of the people who contributed to the GM ASEP/BSEP curriculum development project This project would not have been possible without the tireless efforts of many people. We acknowledge: The IAGMASEP Association members for agreeing to tackle this large project to create the curriculum for the GM ASEP/BSEP schools. The IAGMASEP Curriculum team for leading the members to a single vision and implementation. Direct contributors within Raytheon Professional Services for their support of translating a good idea into reality. Specifically, we thank: Chris Mason and Vince Williams, for their leadership, guidance, and support. Media and Graphics department under Mary McClain and in particular, Cheryl Squicciarini, Diana Pajewski, Lesley McCowey, Jeremy Pawelek, & Nancy DeSantis. For his help on the Electrical curriculum volume, Subject Matter Expert, Ken Beish, Jr., for his wealth of knowledge. Finally, we wish to recognize the individual instructors and staffs of the GM ASEP/BSEP Colleges for their contribution for reformatting existing General Motors training material, adding critical technical content and the sharing of their expertise in the GM product. Separate committees worked on each of the eight curriculum areas. For the work on this volume, we thank the members of the Electrical committee: Jack Davis, Community College of Baltimore County - Catonsville Jim Halderman, Sinclair Community College Megan Kuehm, Community College of Allegheny County Frank Longbottom, Camden County College Jeff Rehkopf, Florida Community College at Jacksonville Randy Peters, Des Moines Area Community College David Rodriguez, College of Southern Idaho Ed Schauffler, Longview Community College Vince Williams, Raytheon
3 Contents Module 16 Acknowledgements... 2 Introduction... 4 Objectives... 4 Lesson 1. Headlamp/Daytime Running Lamp (DRL)... 5 Lesson 2. Headlamp/Daytime Running Lamp (DRL)... 7 Labsheet 1: Headlamps Lesson 3: Exterior Lights Labsheet 2: Turn Lamps Lesson 4: Interior Lamps Lesson 5: Interior Lamps Dimming... 28
4 Introduction Lesson 1: Daytime Running Lamps Lesson 2: Headlamps Lesson 3: External Lamps Lesson 4: Dome and Interior Lamps Lesson 5: Interior Lamps Dimming Labsheet 1: Headlamps/Daytime Running Lamps Labsheet 2: Turn Lamps Student Workbook Objectives NATEF Tasks: Area VI. E. Lighting System Diagnosis and Repair 1. Diagnose the cause of brighter than normal, dim, or no light operation; determine necessary action. 2. Inspect, replace and aim headlights and bulbs. 3. Inspect and diagnose incorrect turn signal or hazard light operation; perform necessary action. Headlamp/Daytime Running Lamp Lab Objectives: identify types of headlamp controls use service information to locate, remove and replace components read electrical schematics make measurements with DVOM use a Tech 2 to monitor and operate inputs and outputs aim headlamps with headlamp aimer Exterior Lamp Lab Objectives: identify types of turn lamp controls use service information to locate, remove, and replace components read electrical schematics make measurements with a DVOM 16-4
5 Lesson 1. Headlamp/Daytime Running Lamp (DRL) The headlamp/drl circuit contain the following main components: Right and left headlamps Multifunction turn signal switch Daytime running lamp (DRL) relay Body control module (BCM) Student Workbook 16-5
6 Headlamps The headlamps are operated when the driver places the headlamp switch in the HEADLAMP position. The LT HDLP and RT HDLP fuse in the IP fuse block, supply battery positive voltage to both the left and right headlamps. The low beam and high beam circuits continue to the headlamp switch. Depending on the position of the dimmer switch, either the low or high beam circuit will now have a path to ground. Ground is provided at G102. The low beam and high beam circuits also provide the body control module (BCM) with both low and high beam inputs. When the BCM senses high beam selection, a class 2 message is sent to the instrument panel cluster (IPC). The IPC then turns on the high beam indicator lamp. The headlamp switch includes the dimmer and the flashto-pass switch. If the headlight switch is left in the HEADLAMP position, the headlights will remain on until turned off or the battery runs dead. Student Workbook Daytime Running Lamps (DRL) Any function that turns on the headlights will cancel the daytime running lamps operation. The LT HDLP fuse in the IP fuse block supplies battery positive voltage to the daytime running lamp (DRL) relay coil circuit. The DRL relay switch contacts are connected to the low beam circuit. When the headlamp switch is placed in the OFF position, the BCM will turn on the daytime running lamps. The BCM energizes the DRL relay, closing the switch contacts and grounding the low beam circuit at G204. The right and left low beam lamps are now in series as are the right and left hi beam lamps. One half of system voltage is dropped across each lamp. The DRL illuminate the low and high beam headlights at a reduced intensity. The DRL will operate when the ignition switch is in the RUN position, the gear selector is not in the PARK position and the parking brake is released. When these conditions have been met the DRL will illuminate. DRL operation in Manual Transmission equipped vehicles will occur when the ignition switch is in the RUN position, and the parking brake is released. 16-6
7 Lesson 2. Headlamp/Daytime Running Lamp (DRL) The main components in the headlights/daytime running lights are: The high beam lamps The low beam lamps The headlight switch The headlight relay The headlamp dimmer switch The ambient light sensor The body control module (BCM) The front turn signal lamps (DRL operation) Student Workbook Headlamps The headlamps may be turned on two different ways: When the driver places the headlamp switch in the ON position, for normal operation. With the headlamp switch placed in the OFF position, during Daytime Running Lamp (DRL) operation in low light conditions, for automatic operation. 16-7
8 Student Workbook The HDLP L and HDLP R fuse in the underhood accessory wiring junction block supply battery positive voltage to both low beam lamps and high beam lamps at all times. The low beam and high beam circuits continue to the headlamp dimmer switch. The low beam or high beam circuit is then, depending on the position of the dimmer switch, connected to the headlamp switch. 16-8
9 Student Workbook When the headlamp switch is placed in the ON position, a ground is provided at circuit 10 for the low beam or high beam lamps through G201. The headlamp switch also provides an input signal to the BCM for it to determine if the headlamps are ON. During Daytime Running Lamp (DRL) operation in low light conditions the BCM will pull the headlamp relay low, energizing it. When the headlamp relay energizes, it provides a ground path for the low beam or high beam lamps through G201, depending on the dimmer switch position. The headlamps will now be illuminated. Both the headlight switch and the headlamp relay can provide a ground for the headlamps for manual or automatic headlight operation. The headlights may be switched to high beam by pulling the dimmer switch handle toward the driver until the high beam dimmer switch is activated. When the dimmer switch is placed in the HIGH BEAM position, the indicator lamp and the high beam lamps are grounded and illuminate. 16-9
10 Flash to Pass The flash to pass feature can be operated with the low beams OFF or ON. The high beams may be momentarily turned on or flashed with the dimmer switch handle. When the headlamp dimmer switch handle is pulled toward the driver, the flash-to-pass switch closes grounding the high beam circuit at G201, both high beams will remain on until the driver releases the switch handle. If the low beam headlamps were on during a flash-to-pass operation, they will remain on. Student Workbook Daytime Running Lamps (DRL) The Daytime Running Lamps (DRL) are designed to automatically operate exterior lights depending on outside light conditions. The ambient light sensor is a light sensitive transistor that varies its voltage signal to the body control module (BCM) in response to changes to the outside (ambient) light level. When the BCM receives this signal it will then operate the DRL in either day mode or low light mode depending on the light level
11 Student Workbook Day Mode In the day mode, the ambient light sensor detects daylight and the BCM applies voltage from circuit 439 to the LH and RH front turn signal lamps circuits 14 and
12 Student Workbook These turn signal lamps are used for DRL illumination under the following conditions: The ignition switch is in the RUN position. The headlamps are OFF. The park brake is OFF (released). The RH or LH turn signal is OFF
13 Student Workbook The Low Light Mode In the low light mode, the ambient light sensor detects low light level, the BCM turns OFF the front turn signal lamps and grounds the park lamp relay circuit 308 and headlamp relay circuit 103. Circuit 10 is grounded by the headlamp relay and the park lamp relay provides voltage to the 10 amp front park fuse and the 15 amp tail and license lamp fuse. Circuit 9 and 301 provide voltage to turn ON the headlamps and park lamps under the following conditions: The ignition switch is in the RUN position. The headlamps are OFF. The park brake is OFF (released). If the engine stalls with the DRL in the low light mode, the BCM turns OFF the headlamps while the engine is being cranked. The park lamps will remain ON while the engine is being cranked
14 Delayed Headlamp Control The BCM has a delayed headlamp control feature that will leave the headlamps ON for 90 seconds after the ignition switch is turned OFF, when the ambient light sensor indicates low light conditions. Park Brake Input The BCM will not operate any headlamps or exterior lamps, if the park brake is applied before the ignition switch is turned to the RUN position. This allows the driver to start the vehicle and keep the headlamps OFF, as long as the park brake is applied. The BCM will activate the headlamps when the park brake is released with the ignition switch in the RUN position. This feature functions only when the park brake is applied before the ignition switch is turned to the RUN position. The headlamps will turn OFF, if the park brake is applied after the ignition switch is turned to the RUN position. Student Workbook 16-14
15 Labsheet 1: Headlamps Lab Objectives: identify types of headlamp controls use service information to locate, remove and replace components read electrical schematics make measurements with DVOM use a Tech 2 to monitor and operate inputs and outputs aim headlamps with headlamp aimer Student Workbook 1. Locate a vehicle with daytime running lights. Visually inspect the bulbs. Are they are single or double filament/? _ 2. Indicate vehicle make, model, year. 3. List the modules and relays used in the operation of the headlamps and DRL. 4. What lamps are illuminated for DRL day mode? 5. Are these lamps operated at reduced intensity? If so, what method is used to reduce the current flow of these lamps? 6. What type of light sensor is used
16 7. Backprobe the signal side of the light sensor with a voltmeter and measure the voltage with a shop light applied to the sensor. Measure the voltage with the sensor covered. Student Workbook 8. List each module input provided by the headlamp switch and indicate the type of input (switched power, ground, etc.) 9. List the headlamp switch inputs that can be displayed by a Tech Use a Tech 2 to check the on-off status of each of these inputs and record the results. 11. List each module input provided by the high-low beam switch and indicate the type of input (switched power, ground, etc.). 12.List the high-low beam switch inputs that can be displayed by a Tech Use a Tech 2 to check the on-off status of each of these inputs and record the results
17 14. List all module controlled relays used in the headlamp circuit. 15.List the module controlled relays that can be controlled by the Tech 2. Student Workbook 16.Use a Tech 2 to turn on and off each of these relays and indicate the results. 17. Perform the Diagnostic System Check for this system and list any items that did not pass. 18. List any recommended repairs. 19.Use a J A or equivalent to demonstrate the procedure to aim the headlamps. 20. Review this worksheet with your instructor before leaving the vehicle
18 Lesson 3: Exterior Lights The exterior light circuit main components are: The headlamp switch The park lamp relay The body control module (BCM) The turn signal switch The turn/hazard flasher The stop lamp switch The front park lamps The rear park lamps (tail lamps) The front turn signal lamps The rear turn signal lamps The center high mounted stop lamp (CHIMSL) The license lamp Student Workbook Park and License Lamps The park and license lamps are controlled by the headlamp switch or the park lamp relay in the RH IP Accessory Wiring Junction Block
19 When the headlamp switch is turned to the park position B+ is supplied through the headlamp switch to both the tail lamp, license lamp fuse and the front park lamp fuse. B+ is then applied through the park lamps circuit to the front and rear park lamps and the license lamps turning them on. Student Workbook The park lamps and license lamps receive ground at all times
20 Student Workbook Both the coil and the switched sides of the park lamp relay receive B+ at all times. When the BCM detects a low light condition and an exterior lamp off input from the headlamp switch it will ground the coil in the park lamp relay. B+ is then supplied through the relay to the tail lamp, license lamp fuse and the front park lamp fuse turning on the front park and tail and license lamps
21 Student Workbook Turn Lamps When the ignition is turned to the run position, B+ is supplied to the turn signal fuse. B+ is then applied through the turn signal fuse circuit to the hazard lamp/turn signal flasher. From the flasher the turn signal switch output circuit is applied to the turn signal switch. From the turn signal switch the turn signal is applied to the instrument panel cluster for turn indicator and to all of the turn lamps flashing the lamps on and off
22 Student Workbook If the daytime running lamps (DRL) are in the day mode (front turn signals illuminated) and the BCM senses a right or left turn signal input, the input side DRL will be turned off for normal turn signal operation. The turn lamps receive ground at all times. Hazard Lamps The hazard lamps receive B+ at all times through the hazard switch fuse to the hazard lamp\turn signal flasher. when the hazard switch is placed in the hazard position then B+ is applied to all of the turn lamps and turn indicators simultaneously flashing them on and off. Stop Lamps The stop lamps receive B+ at all times through the brake switch fuse to the stop lamp switch. When the stop lamp switch is closed, B+ is applied to the stop lamp switch output circuit to all the stop lamps turning them on. The stop lamps receive ground at all times
23 Labsheet 2: Turn Lamps Lab Objectives: identify types of turn lamp controls use service information to locate, remove and replace components read electrical schematics make measurements with DVOM Student Workbook 1. Indicate vehicle make, model, year. 2. Observing all safety precautions, remove the turn signal switch. 3. Use an ohmmeter to check for continuity through the switch for the right and left front and the right and left rear turn signals. Record the results. _ 4. Reassemble the vehicle and verify proper turn signal flash rate. 5. Remove one bulb from the left turn signal circuit. Operate the left turn signal and observe flash rate. 6. Remove a second bulb from the left turn signal circuit. Operate the left turn signal and observe flash rate. 7. What effect does current have on turn signal flash rate? _ 8. Reassemble the vehicle and perform the Diagnostic System Check. List any items that did not pass. 9. List any recommended repairs. 10. Review this worksheet with instructor before leaving the vehicle
24 Lesson 4: Interior Lamps By using a feature called inadvertent power control, the body control module (BCM) supplies power to all of the following components: The courtesy lamps The dome lamps The rear view mirror reading lamps The instrument panel compartment lamp The rear compartment lamp Student Workbook The left front door ajar switch turns the interior lamps on through the BCM by grounding CKT 394. When the left front door is open, the switch is closed. This condition provides a ground and a door open input to the BCM
25 Student Workbook The BCM then grounds the following lamps through CKT 156 in order to turn the lamps on: The dome lamp The rearview mirror lamps The courtesy lamps 16-25
26 Student Workbook The right front door ajar switch and the rear door ajar switches turn the interior lamps on by grounding CKT 395 from the BCM. When the ignition key is removed from the lock cylinder, the interior lamps remain on for approximately 40 seconds. The BCM provides an interior lamps-on delay after a door is opened. The lamps remain on for approximately 40 seconds or until the ignition switch is turned to the ON position. The 40 second lamps-on delay reduces to 4 seconds if a door is opened within 2 minutes of the ignition switch being moved from the ON position. The interior lamps immediately turn off when the vehicle begins to move
27 Student Workbook The dome lamp OFF-DOOR-ON switch controls the dome lamp. When the switch is in the OFF position, the dome lamp remains off. When the switch is in the DOOR position, the dome lamp lights when a door is opened by the BCM grounding CKT 156. When the switch is in the ON position, ground is supplied through CKT 750. The rear view mirror reading lamps are controlled by the rear view mirror reading lamps switch or through CKT 156 from the BCM. Voltage is supplied at all times to the BCM through the INT LPS fuse. The BCM supplies voltage to the interior lamps through CKT Battery Run Down Protection When the ignition switch is in the OFF position, the BCM turns off the power on CKT 1732 to all of the interior lamps after minutes. The BCM will reset the inadvertent power control relay output when one of the following actions is performed: Open or close a door. Turn the ignition switch to the ON position. Turn off any interior lamps that may be on. Press the power door lock switch/keyfob button. Press the decklid release keyfob button
28 Lesson 5: Interior Lamps Dimming The interior lamps dimming circuit contains the following main components: Instrument panel dimmer switch Lamp dimmer module Instrument cluster lamps Door switch lamps Radio backlighting Console lamp Transaxle shift indicator lamp Student Workbook When the headlamp switch is in the PARK or the HEAD position, battery voltage is applied to the following components through the INST LPS fuse through CKT 32: The panel dimmer switch The lamp dimmer module When the lamp dimmer module is turned OFF, no voltage is applied to the interior lamps. When the dimmer wheel is turned to the low position, the dimmer switch applies a minimum voltage to the lamp dimmer module through CKT 44. The lamp dimmer module then applies a low voltage to the interior lamps through CKT 8. As the dimmer wheel is turned to the high position, the voltage signal to the lamp dimmer module increases
29 Student Workbook This condition causes the lamp dimmer module to apply a proportionately increasing voltage to the interior lamps. Ground for the lamps is supplied by the individual components in which the lamps are located
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