2001 IMPREZA SERVICE MANUAL QUICK REFERENCE INDEX

Transcription

1 00 IMPREZA SERVICE MANUAL QUICK REFERENCE INDEX BODY SECTION HVAC SYSTEM (HEATER, VENTILATOR AND A/C) HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS) AIRBAG SYSTEM AC AC AB This service manual has been prepared to provide SUBARU service personnel with the necessary information and data for the correct maintenance and repair of SUBARU vehicles. This manual includes the procedures for maintenance, disassembling, reassembling, inspection and adjustment of components and diagnostics for guidance of experienced mechanics. Please peruse and utilize this manual fully to ensure complete repair work for satisfying our customers by keeping their vehicle in optimum condition. When replacement of parts during repair work is needed, be sure to use SUBARU genuine parts. AIRBAG SYSTEM (DIAGNOSTICS) SEAT BELT SYSTEM LIGHTING SYSTEM WIPER AND WASHER SYSTEMS ENTERTAINMENT COMMUNICATION SYSTEM GLASS/WINDOWS/MIRRORS AB SB LI WW ET COM GW BODY STRUCTURE BS INSTRUMENTATION/DRIVER INFO IDI SEATS SE SECURITY AND LOCKS SL IMMOBILIZER (DIAGNOSTICS) IM All information, illustration and specifications contained in this manual are based on the latest product information available at the time of publication approval. SUNROOF/T-TOP/CONVERTIBLE TOP (SUNROOF) EXTERIOR/INTERIOR TRIM SR EI FUJI HEAVY INDUSTRIES LTD. G80GE6

2 00 IMPREZA SERVICE MANUAL QUICK REFERENCE INDEX BODY SECTION EXTERIOR BODY PANELS EB CRUISE CONTROL SYSTEM CC CRUISE CONTROL SYSTEM (DIAGNOSTICS) CC G80GE6

3 HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS) AC Page. Basic Diagnostic Procedure.... General Description.... Electrical Components Location A/C Control Module I/O Signal Diagnostics Chart for Diagnosis System Diagnostics for A/C System Failure Diagnostic Procedure for Actuators Diagnostic Procedure for Sensors Symptom Related Diagnostic...46

4 BASIC DIAGNOSTIC PROCEDURE. Basic Diagnostic Procedure A: PROCEDURE START INSPECTIONS. )Perform pre-inspection. )Perform self-diagnosis. <Ref. to AC-8, SELF-DIAGNOSIS MODE, Diagnostics Chart for Diagnosis System.> CONFIRM MALFUNCTION PART. Confirm malfunction part with self-diagnosis. CHECK COMPARTMENT TEMPERATURE. )Turn A/C switch ON. )Set temperature at maximum cold position. )Check compartment temperature changes. 4 CHECK A/C SYSTEM RESPONSE. Change the temperature setting, and check response of A/C system. Step Check Yes No Dose self-diagnosis operate? Go to step. <Ref. to AC-, A/ C AND/OR SELF- DIAGNOSIS SYS- TEMS DO NOT OPERATE, Diagnostics for A/C System Failure.> Can the malfunction part be confirmed? Is the compartment temperature changed? Dose A/C system respond quickly? Repair the malfunction part according to each diagnostics chart. Go to step 4. Go to step. <Ref. to AC-6, COMPARTMENT TEMPERATURE IS NOT CHANGED OR A/ C SYSTEM DOES NOT RESPOND QUICKLY, Diagnostics for A/C System Failure.> A/C system is OK. <Ref. to AC-6, COMPARTMENT TEMPERATURE IS NOT CHANGED OR A/ C SYSTEM DOES NOT RESPOND QUICKLY, Diagnostics for A/C System Failure.> AC-

5 GENERAL DESCRIPTION. General Description A: CAUTION ) Never connect the battery in reverse polarity. The Auto A/C control module will be destroyed instantly. ) Do not disconnect the battery terminals while the engine is running. A large counter electro motive force will be generated in the alternator, and this voltage may damage electronic parts such as A/C control module. ) Before disconnecting the connectors of each sensor and the A/C control module, be sure to turn off the ignition switch. Otherwise, the Auto A/C control module may be damaged. 4) Every Auto A/C-related part is a precision part. Do not drop them. 5) Airbag system wiring harness is routed near the A/C control panel (A/C control module) and junction box. CAUTION: All Airbag system wiring harness and connectors are colored yellow. Do not use electrical test equipment on these circuits. Be careful not to damage Airbag system wiring harness when servicing the A/C control panel (A/C control module) and junction box. B: INSPECTION Before performing diagnosis, check the following items which might affect engine problems.. BATTERY ) Measure battery voltage and specific gravity of electrolyte. Standard voltage: V Specific gravity: Above.60 ) Check the condition of the fuses for A/C, heater and other fuses. ) Check the condition of the harnesses and harness connectors connection.. ASPIRATOR HOSE ) Make sure that the aspirator hose is securely connected to the heater unit by inserting a hand from the driver's compartment and secure as necessary. ) Turn ignition switch to ON and push A/C switch. ) Turn temperature control dail to maximum hot position. 4) Turn air flow control dial to DEF position. 5) Turn fan speed control dial to 4TH position. 6) Firmly hold a thin thread (b) in front of the in-vehicle sensor suction port (a) for the auto A/C control unit and check that the thread moves towards the port indicating that air is being sucked into the port. NOTE: Ensure the thread does not get sucked into the port. Hold the thread approximately 5 mm (0.0 in) away from the port when the suction force is not very strong HV007 AC-

6 GENERAL DESCRIPTION 7) If the thread does not move at all, remove the auto A/C control unit <Ref. to AC-6, REMOVAL, Control Unit.> and check for improper connection of the aspirator hose (a) and auto A/C control unit and secure as necessary.. REFRIGERANT LINE Check contact for refrigerant line (A). (a) HV008 (A) 4. CONTROL LINKAGE ) Check state of mode door linkage. ) Check state of air mix door linkage. ) Check state of intake door linkage. HV009 AC-4

7 GENERAL DESCRIPTION 5. CONTROL SWITCHES Start and warm up engine completely. ) Inspection using switches. No. Point to check Switch operation Judgement standard A/C switch LED goes out. Fan speed control dial OFF position Fan speed: OFF Compressor: OFF Fan speed control dial st nd rd 4th Fan speed changes st nd rd 4th A. Fan speed control dial auto position. Outlet air: Cool B. Temperature control dial maximum cold position Fan speed: 4th Compressor: ON Fan speed control dial Outlet air: Cool Hot C. Turn temperature control dial from maximum and temperature control dial Compressor: ON Fan speed: AUTO cold position to maximum hot position gradually. Outlet air: Hot D. Temperature control dial maximum hot position Fan speed: 4th Compressor: ON Air flow control dial Air flow control dial VENT BI-LEVEL HEAT Air flow outlet changes from VENT BI- DEF/HEAT DEF LEVEL HEAT DEF/HEAT DEF. FRESH/RECIRC 4 FRESH/RECIRC switch ON switch ) Compressor operation inspection A. A/C switch ON Compressor B. Fan speed control dial st-4th ) Illumination control inspection Changes from RECIRC FRESH, or FRESH RECIRC. No. Point to check Switch operation Judgement standard Compressor: ON No. Point to check Switch operation Judgement standard Illumination Lighting switch ON Illumination light illuminates. AC-5

8 ELECTRICAL COMPONENTS LOCATION. Electrical Components Location A: LOCATION. ENGINE COMPARTMENT () () () () () () (4) HV000 () A/C compressor () Pressure switch () A/C relay (4) Ambient sensor AC-6

9 . PASSENGER COMPARTMENT ELECTRICAL COMPONENTS LOCATION (7) (6) (4) (8) (5) () () () (4) (6) () (5) () () (7) HV00 () Evaporator sensor (4) Intake door actuator (7) Sunload sensor () Blower motor (5) Air mix door actuator (8) In-vehicle sensor () Blower motor resistor (6) Mode door actuator (built-in Auto A/C control module) AC-7

10 A/C CONTROL MODULE I/O SIGNAL 4. A/C Control Module I/O Signal A: ELECTRICAL SPECIFICATION To B8 : b To B8 : a HV00 Content Battery power supply (Memory back-up) Connector & Terminal No. b b Battery voltage, 4 (engine running) Signal (V) IGN power supply a8 b Battery voltage (ignition switch ON), 4 (engine running) ACC power supply (OFF: ignition in START or diagnosis b b Battery voltage, 0 (engine cranking), Battery voltage (during engine starts) system reset) A/C control module ground circuit b body 0 (ignition switch ON) circuit constantly grounded Sensor ground circuit b7 body 0 (ignition switch ON) continuity exists Ambient sensor b9 b7 Evaporator sensor b7 b7 Approx.. (disconnect connector, and ignition switch ON) Thermometer b5 b Sunload sensor b6 b7 Approx. 4. (disconnect connector, and ignition switch ON) Air mix door actuator b5 b Battery voltage (ignition switch ON) Air mix door actuator P.B.R. a4 b7 Approx. 5.5 Mode door actuator b6 b7 Battery voltage (ignition switch ON) Mode door actuator P.B.R. a b7 Approx. 5.5 Intake door FRS voltage a5 a7 Battery voltage (CIRC switch OFF) Intake door CIRC voltage a7 a5 Battery voltage (CIRC switch ON) Blower fan relay b4 body Battery voltage (ignition switch ON) A/C relay b b 0 (ignition and A/C switches ON) Battery voltage (A/C switch OFF) Illumination control signal b0 b0 Battery voltage (ignition and lighting switches ON) Rear defogger a b 0 (IGN ON, R Def SW ON) AC-8

11 B: SCHEMATIC. AIR CONDITIONER AUTO A/C LHD MODEL A/C CONTROL MODULE I/O SIGNAL A/C(ALH)-0 FB-9 F/B FUSE NO. 7 (IG) GOr TO POWER SUPPLY ROUTING FB-0 F/B FUSE NO. 7 (IG) GOr FB-4 F/B FUSE NO. (B) F/B FUSE NO. (B) RW A/C(ALH)-0 : TURBO ENGINE MODEL AIR CONDITIONING RELAY NA NA : NON-TURBO ENGINE MODEL RW BLOWER MOTOR RELAY 0 9 F GOr BrY Br L BrY 6 BrY Br 5 Br F45 B6 GOr GR BR 4 B50 BLOWER MOTOR PRESSURE SWITCH A: B4 D: B7 ENGINE CONTROL MODULE (TURBO ENGINE MODEL) A9 A6 D7 GR LY Br NA BR BY B87 BrY Y F79 A: B4 B: B5 C: B6 ENGINE CONTROL MODULE (NON-TURBO ENGINE MODEL) A7 B7 C0 Br LY GR NA NA BY RL B 4 B75 FAN CONTROL AMP GOr Y L F4 LY BrY GOr GR BY RL B THERMAL PROTECTOR MAGNET CLUTCH B4 B A8 B4 A: B8 B: B8 B A6 AUTO A/C CONTROL MODULE REF. TO GND-0 COMPRESSOR F79 (GRAY) B87 F4 (GRAY) B75 B50 A: B8 (GRAY) B: B8 (GRAY) A: B4 : F45 B: B5 : NA C: B6 : NA F D: B7 : A: B4 : NA RELAY HOLDER (BLACK) GL46-0A AC-9

12 A/C CONTROL MODULE I/O SIGNAL A/C(ALH)-0 FB-8 M/B FUSE NO. (B) LR TO POWER SUPPLY ROUTING FB-9 F/B FUSE NO. (B) LR FB-7 F/B FUSE NO. 9 (ACC) YG FB-7 F/B FUSE NO. 8 (IG) GB VEHICLE SPEED SENSOR (MT) GB BR GY B7 C: B56 TRANSMISSION CONTROL MODULE (AT) GY C7 A/C(ALH)-0 MT A R A4 RL B0 V BR B0 B B LR BR D B YG B9 GY NA AT B09 F76 SMJ BR F60 BR B BR 6 E BR 6 E NA REF. TO R/DEF(L)-0 REF. TO ILM(L)-0 NA NA : TURBO ENGINE MODEL : NON-TURBO ENGINE MODEL BR GE A: B8 B: B8 AUTO A/C CONTROL MODULE B7 : NA B7 : B (BROWN) A: B8 (GRAY) B: B8 (GRAY) C: B56 (GREEN) 4 F (BROWN) GL46-0B AC-0

13 A/C CONTROL MODULE I/O SIGNAL A/C(ALH)-0 BP B9 A: B8 B: B8 AUTO A/C CONTROL MODULE R B7 GR B6 B7 BL A YB A/C(ALH)-0 BP BP 5 BL BL 4 B6 F45 GR GR BL BL BP BP YB YB B6 i BP YB BL BL BP F78 R BL B56 GR BL i5 B8 B B I/F I/F -COM LCD(OUT TEMP) AMBIENT SENSOR EVAPORATION THERMO SWITCH SUNLOAD SENSOR B: i COMBINATION METER F78 (BLACK) A: B8 (GRAY) B: B8 (GRAY) F45 B6 (BLACK) B56 i B: i (GREEN) GL46-0C AC-

14 A/C CONTROL MODULE I/O SIGNAL A/C(ALH)-04 B5 WG A: B8 B: B8 AUTO A/C CONTROL MODULE BL A5 LgR A7 GY B5 A4 L B B A RY LW B6 A/C(ALH)-04 WG J WG WG B WG BL LgR NA B09 F76 SMJ AIR MIX ACTUATOR GY LW MODE ACTUATOR WG F6 L B RY B WG 0 E WG 5 E B9 B77 NA E8 B9 B THERMOMETER FRESH/RECIRC ACTUATOR REF. TO GND-0 0 B77 E8 (LIGHT GRAY) B9 (BLACK) A: B8 (GRAY) B: B8 (GRAY) F6 (BLACK) B B (LIGHT GRAY) GL46-0D AC-

15 . AIR CONDITIONER AUTO A/C RHD MODEL A/C CONTROL MODULE I/O SIGNAL A/C(ARH)-0 FB-9 F/B FUSE NO. 7 (IG) GOr TO POWER SUPPLY ROUTING FB-0 F/B FUSE NO. 7 (IG) GOr FB-4 F/B FUSE NO. (B) F/B FUSE NO. (B) RW A/C(ARH)-0 : TURBO ENGINE MODEL AIR CONDITIONING RELAY NA NA : NON-TURBO ENGINE MODEL RW BLOWER MOTOR RELAY 0 9 F GOr BrY Br L BrY 6 BrY Br 6 BrR F45 B6 GOr GR BR 4 B50 BLOWER MOTOR PRESSURE SWITCH A: B4 D: B7 ENGINE CONTROL MODULE (TURBO ENGINE MODEL) A9 GR A6 PB D7 BrR NA BR BW B87 GOr Lg F79 A: B4 B: B5 C: B6 ENGINE CONTROL MODULE (NON-TURBO ENGINE MODEL) A7 BrR B7 PB C0 GR NA NA BW RL B 4 B75 FAN CONTROL AMP THERMAL PROTECTOR MAGNET CLUTCH B4 PB B BrY A8 GOr B4 GR B BW A6 RL B Lg BrY L F4 COMPRESSOR A: B8 B: B8 AUTO A/C CONTROL MODULE REF. TO GND-0 F79 (GRAY) B87 F4 (GRAY) B75 B50 A: B8 (GRAY) F45 (BLACK) B: B8 (GRAY) A: B4 : B: B5 : NA C: B6 : NA F D: B7 : A: B4 : NA RELAY HOLDER (BLACK) GR46-0A AC-

16 A/C CONTROL MODULE I/O SIGNAL A/C(ARH)-0 TO POWER SUPPLY ROUTING MB-0 M/B FUSE NO. (B) LR FB-7 F/B FUSE NO. 9 (ACC) YG FB-7 F/B FUSE NO. 8 (IG) GB VEHICLE SPEED SENSOR (MT) GB GW GY B7 C: B56 TRANSMISSION CONTROL MODULE (AT) AT GY C7 A/C(ARH)-0 MT GW B A R REF. TO R/DEF(R)-0 A4 RL V REF. TO ILM(ROI)-0 ILM(RWI)-0 * B0 B0 LR B YG B * NA : WITH ILLUMINATION CONTROL MODEL : YL : WITHOUT ILLUMINATION CONTROL MODEL : B : TURBO ENGINE MODEL : NON-TURBO ENGINE MODEL BR BR 6 GE E GY B9 A: B8 B: B8 AUTO A/C CONTROL MODULE B7 : NA B7 : B (BROWN) A: B8 (GRAY) B: B8 (GRAY) C: B56 (GREEN) GR46-0B AC-4

17 A/C CONTROL MODULE I/O SIGNAL A/C(ARH)-0 Or B9 A: B8 B: B8 AUTO A/C CONTROL MODULE R B7 GR B6 B7 YB A W A/C(ARH)-0 Or Or YB 4 YB B6 F45 GR 5 GR YB 6 YB Or 4 Or W W B7 i Or YB F78 R W YB YB Or B56 GR YB i5 B8 B B I/F I/F -COM LCD(OUT TEMP) AMBIENT SENSOR EVAPORATION THERMO SWITCH SUNLOAD SENSOR B: i COMBINATION METER F78 (BLACK) A: B8 (GRAY) F45 (BLACK) B: B8 (GRAY) B: i (GREEN) B56 i i GR46-0C AC-5

18 A/C CONTROL MODULE I/O SIGNAL A/C(ARH)-04 B5 WG A: B8 B: B8 AUTO A/C CONTROL MODULE BL A5 LgR A7 GY B5 A4 L B B A RY B6 LW A/C(ARH)-04 B WG WG 0 WG BL LgR NA B E WG WG 5 B E AIR MIX ACTUATOR GY L B LW RY B MODE ACTUATOR B9 B77 NA : TURBO ENGINE MODEL NA NA : NON-TURBO ENGIN MODEL E8 B9 FRESH/RECIRC ACTUATOR THERMOMETER REF. TO GND-0 0 B77 B9 E8 (LIGHT GRAY) B (BLACK) A: B8 (GRAY) B: B8 (GRAY) B NA : (BLACK) : (LIGHT GRAY) GR46-0D AC-6

19 A/C CONTROL MODULE I/O SIGNAL AC-7

20 DIAGNOSTICS CHART FOR DIAGNOSIS SYSTEM 5. Diagnostics Chart for Diagnosis System A: SELF-DIAGNOSIS MODE () () (4) () (5) (6) HV00 () Air flow control dial () A/C switch (5) Temperature control dial () Rear window defogger switch (4) FRESH/RECIRC switch (6) Fan speed control dial SELECT CONTROL PANEL TO SELF-DIAG- NOSIS MODE. )Turn fan speed control dial to OFF position. )Start engine and press rear window defogger switch for at least 5 seconds. The rear window defogger switch must be pressed within 0 seconds after starting engine. CHECK LED ILLUMINATION. Make sure that all switch LED illuminate (RHD model) or blink (LHD model) on control panel. Step Check Yes No Does the self-diagnosis mode operate? CHECK SENSORS MALFUNCTION. Does rear window defogger )Turn fan speed control dial to AUTO position. switch LED illuminate? )If system has the trouble for each sensor, rear window defogger switch LED is turned off. )If system has no trouble, rear window defogger switch LED is illuminated. 4 CONFIRM MALFUNCTIONING SENSOR. )Turn fan speed control dial to st position. )Turn air flow control dial to each mode position, check each switch LED illumination according to sensor check table. <Ref. to AC- 0, SENSOR CHECK TABLE, SELF-DIAGNO- SIS MODE, Diagnostics Chart for Diagnosis System.> Go to step. <Ref. to AC-, A/ C AND/OR SELF- DIAGNOSIS SYS- TEMS DO NOT OPERATE, Diagnostics for A/C System Failure.> Do all LED illuminate or blink? Go to step. Check the switch LED. Do FRESH/RECIRC and A/C switch LED illuminate when turning the dial to each mode position? Go to step 5. Go to step 4. Go to step 5. Repair malfunctioning sensor. <Ref. to AC-6, Diagnostic Procedure for Sensors.> AC-8

21 DIAGNOSTICS CHART FOR DIAGNOSIS SYSTEM Step Check Yes No Go to step 6. 5 CHECK MODE DOOR POSITION SIGNAL. )Turn fan speed control dial to nd position. )If system has the trouble for mode door position signal, rear window defogger switch LED is turned off. )If system has no trouble, rear window defogger switch LED is illuminated. Does rear window defogger switch LED illuminate? 6 CHECK BLOWER FAN OPERATION. )Turn fan speed control dial to rd position. )Turn temperature control dial, check that blower fan speed changes depending on set temperature. 7 CHECK OPERATION OF EACH ACTUATOR, BLOWER FAN AND COMPRESSOR CLUTCH. )Turn fan speed control dial to 4TH position. )Select operating mode by turning air flow control dial. )Check the operation of each mode according to operating mode table. <Ref. to AC-0, OPERATING MODE TABLE, SELF-DIAGNO- SIS MODE, Diagnostics Chart for Diagnosis System.> Air inlet: Air outlet: Air mix door: Blower fan: A/C compressor: Does blower fan speed change? Does the operation of each mode match to the operating mode table? Go to step 7. Push A/C switch or turn ignition switch OFF, and finish the self-diagnosis. Check mode door actuator circuit. <Ref. to AC-, MODE DOOR ACTUATOR, Diagnostic Procedure for Actuators.> Check blower motor circuit. <Ref. to AC-4, BLOWER MOTOR IS NOT ROTATED, Diagnostics for A/C System Failure.> Repair the malfunction part according to each diagnostics chart. AC-9

22 DIAGNOSTICS CHART FOR DIAGNOSIS SYSTEM. SENSOR CHECK TABLE NOTE: When the sunload sensor is checked indoors or in the shade, open circuit might be indicated. Always check the sunload sensor at a place where sun shines directly on it. Air flow control dial position Checked sensor No trouble Short circuit Open circuit VENT BI-LEVEL HEAT DEF/HEAT DEF Ambient sensor In-vehicle sensor Evaporator sensor Sunload sensor Air mix door motor (Potentio balance resister). OPERATING MODE TABLE A/C switch LED and FRESH/ RECIRC switch LED illuminate A/C switch LED and FRESH/ RECIRC switch LED illuminate A/C switch LED and FRESH/ RECIRC switch LED illuminate A/C switch LED and FRESH/ RECIRC switch LED illuminate A/C switch LED and FRESH/ RECIRC switch LED illuminate A/C switch LED illuminate A/C switch LED illuminate A/C switch LED illuminate A/C switch LED illuminate FRESH/RECIRC switch LED illuminate FRESH/RECIRC switch LED illuminate FRESH/RECIRC switch LED illuminate FRESH/RECIRC switch LED illuminate A/C switch LED illuminate Air flow control dial position Operation VENT BI-LEVEL HEAT DEF/HEAT DEF Air outlet VENT BI-LEVEL HEAT DEF/HEAT DEF Air inlet RECIRC RECIRC RECIRC FRESH FRESH Air mix door FULL COOL FULL COOL FULL HOT FULL HOT FULL COOL Blower fan 5V 5V 8V 0V Power supply voltage A/C compressor ON OFF OFF ON ON AC-0

23 DIAGNOSTICS CHART FOR DIAGNOSIS SYSTEM AC-

24 DIAGNOSTICS FOR A/C SYSTEM FAILURE 6. Diagnostics for A/C System Failure A: A/C AND/OR SELF-DIAGNOSIS SYSTEMS DO NOT OPERATE TROUBLE SYMPTOM: Set temperature is not indicated on display, switch LEDs are faulty and switches do not operate. Self-diagnosis system does not operate. WIRING DIAGRAM: F/B NO. 7 IGNITION SWITCH SBF-4 SBF- 00A BATTERY F/B NO. 9 F/B NO. A8 B B B A: B8 B: B8 AUTO A/C CONTROL MODULE A: B8 B: B HV004 AC-

25 DIAGNOSTICS FOR A/C SYSTEM FAILURE Step Check Yes No CHECK FUSE. Is the fuse blown-out? Replace fuse. Go to step. )Turn ignition switch to OFF. )Remove fuse No. from main fuse box. )Check condition of fuse. CHECK FUSE. )Turn ignition switch to OFF. )Remove fuses No. 9 and No. 7 from fuse & relay box. )Check condition of fuse. Is the fuse blown-out? Replace fuse. Go to step. CHECK A/C CONTROL MODULE POWER CIRCUIT. )Pull out A/C control module connector. )Measure voltage between A/C control module connector terminal and chassis ground when turning ignition switch to OFF. (B8) No. (+) Chassis ground ( ): Is the voltage more than 0 V? Go to step 4. Repair short circuit in harness for power supply line. 4 CHECK A/C CONTROL MODULE POWER CIRCUIT. Measure voltage between A/C control module connector terminal and chassis ground when turning ignition switch to ACC. (B8) No. (+) Chassis ground ( ): 5 CHECK A/C CONTROL MODULE POWER CIRCUIT. Measure voltage between A/C control module connector terminal and chassis ground when turning ignition switch to ON. (B8) No. 8 (+) Chassis ground ( ): 6 CHECK A/C CONTROL MODULE GROUND CIRCUIT. Measure resistance of harness between A/C control module and chassis ground. (B8) No. Chassis ground: 7 CHECK POOR CONTACT. Check poor contact in A/C control module. Is the voltage more than 0 V? Go to step 5. Is the voltage more than 0 V? Go to step 6. Is the resistance less than 5 Ω? Is there poor contact in A/C control module? Go to step 7. Repair poor contact in A/C control module. Repair short circuit in harness for power supply line. Repair short circuit in harness for power supply line. Repair short circuit in harness for ground line. Contact with your Subaru distributor. AC-

26 DIAGNOSTICS FOR A/C SYSTEM FAILURE B: BLOWER MOTOR IS NOT ROTATED TROUBLE SYMPTOM: Blower motor is not rotated. Blower motor is not rotated in HI. WIRING DIAGRAM: F/B NO. SBF- SBF- BATTERY F/B NO. BLOWER MOTOR RELAY F/B NO. 7 IGNITION SWITCH SBF-4 4 B50 BLOWER MOTOR B87 BLOWER MOTOR RESISTOR 4 B75 A6 B B4 A: B8 B: B8 AUTO A/C CONTROL MODULE B87 B75 B50 A: B B: B HV005 AC-4

27 DIAGNOSTICS FOR A/C SYSTEM FAILURE Step Check Yes No CHECK FUSE. Are any of the fuses blownout? Replace fuse. Go to step. )Remove No., No. and No. 7 fuses in fuse & relay box. )Check condition of fuses. CHECK POWER SUPPLY TO BLOWER FAN MOTOR. )Turn ignition switch to ON. )Turn blower switch to ON. )Measure voltage between blower fan motor and chassis ground. (B87) No. (+) Chassis ground ( ): CHECK BLOWER FAN MOTOR RELAY. )Turn ignition switch to OFF. )Remove blower fan motor relay. )Connect battery to No. and No. terminals of blower fan motor connector. 4)Measure resistance between No. and No. 4 terminals. Terminals: No. No. 4 Is the voltage more than 0 V? Go to step. Is the resistance less than Ω? 4 CHECK BLOWER FAN MOTOR. Does the blower fan motor )Disconnect connector from blower fan motor. operate? )Connect battery to connector terminals of blower fan motor. )Make sure that blower fan motor is operated. 5 CHECK POOR CONTACT. Check poor contact in A/C control module. Is there poor contact in A/C control module? Go to step 4. Go to step 5. Repair poor contact in A/C control module. Repair open circuit in harness for blower fan motor power supply line. Replace blower fan motor relay. Replace blower fan motor. Contact with your Subaru distributor. AC-5

28 DIAGNOSTICS FOR A/C SYSTEM FAILURE C: COMPARTMENT TEMPERATURE IS NOT CHANGED OR A/C SYSTEM DOES NOT RESPOND QUICKLY WIRING DIAGRAM FOR TURBO ENGINE MODEL: F7 0A 0A 4 F/B No.7 F/B No.8 IGNITION SWITCH SBF-4 SBF- BATTERY F66 MAIN FAN RELAY MAIN FAN MOTOR F0 MAIN FAN RELAY- 4 F8 SUBFAN RELAY F7 SUB FAN MOTOR F9 SUBFAN RELAY F AIR CONDITIONING RELAY F45 F6 PRESSURE SWITCH B6 F79 : LHD MODEL: : RHD MODEL: COMPRESSOR MAGNET CLUTCH F4 D7 D7 D8 A: B4 D: B7 A9 A6 ENGINE CONTROL MODULE A: B: B8 B8 B4 B B4 AUTO A/C CONTROL MODULE 4 5 : LHD MODEL: : RHD MODEL: : LHD MODEL: 5 : RHD MODEL: 6 : LHD MODEL: 6 : RHD MODEL: 6 : LHD MODEL: : RHD MODEL: 7 6 : LHD MODEL: : RHD MODEL: 7 F79 F4 F6 B: B8 F45 RHD F45 LHD F F7 F8 F F9 F0 F66 A: B4 D: B HV006 AC-6

29 DIAGNOSTICS FOR A/C SYSTEM FAILURE WIRING DIAGRAM FOR NON-TURBO ENGINE MODEL: F7 0A 0A 4 F/B No.7 F/B No.8 IGNITION SWITCH SBF-4 SBF- BATTERY F66 MAIN FAN RELAY MAIN FAN MOTOR F0 F9 F MAIN FAN RELAY AIR CONDITIONING RELAY F45 F7 SUB FAN MOTOR COMPRESSOR MAGNET CLUTCH F4 PRESSURE SWITCH F79 A7 A A A: B4 B: B5 C: B6 B6 C0 B7 ENGINE CONTROL MODULE A: B: B8 B8 B4 B B4 AUTO A/C CONTROL MODULE F6 4 5 : LHD MODEL: : RHD MODEL: : LHD MODEL: : RHD MODEL: : LHD MODEL: 5 : RHD MODEL: 6 : LHD MODEL: 6 : RHD MODEL: 6 : LHD MODEL: : RHD MODEL: 7 6 : LHD MODEL: : RHD MODEL: 7 F79 F6 F4 B: B8 F45 RHD F45 LHD F B: B5 F7 F8 F F9 F0 F66 C: B6 A: B HV007 AC-7

30 DIAGNOSTICS FOR A/C SYSTEM FAILURE Step Check Yes No CHECK FUSE. )Turn ignition switch to OFF. )Remove No. fuse in main fuse box. )Check condition of fuse. Is the fuse blown-out? Replace fuse. Go to step. CHECK POWER SUPPLY TO MAGNET CLUTCH OF A/C COMPRESSOR. )Start the engine, and turn A/C switch to ON. )Set temperature control dial to maximum cold position. )Measure voltage between magnet clutch connector and chassis ground. (F4) No. (+) Chassis ground ( ): Is the voltage more than 0 V? Go to step. Repair open circuit in harness for power supply line of the A/C compressor. CHECK SIGNAL VOLTAGE TO A/C RELAY. )Turn ignition switch to ON. )Turn A/C switch to ON. )Measure signal voltage to A/C relay and chassis ground. (F) No. 9 (+) Chassis ground ( ): 4 CHECK A/C RELAY. )Remove A/C relay in main fuse box. )Check A/C relay. <Ref. to AC-, INSPEC- TION, Relay and Fuse.> 5 CHECK OPERATION OF MAIN FAN MOTOR. )Start the engine. )Turn A/C switch to ON. )Check operation of main fan motor. 6 CHECK POWER SUPPLY TO MAIN FAN MO- TOR. CAUTION: Be careful not to overheat engine during repair. )Turn ignition switch to OFF. )Disconnect connector from main fan motor. )Start the engine, and warm it up until engine coolant temperature increases over 95 C (0 F). 4)Stop the engine and turn ignition switch to ON. 5)Measure voltage between main fan motor connector and chassis ground. Turbo engine model: (F7) No., (+) Chassis ground ( ): Non-turbo engine model: (F7) No. (+) Chassis ground ( ): 7 CHECK GROUND CIRCUIT OF MAIN FAN MOTOR. )Turn ignition switch to OFF. )Measure resistance between main fan motor connector and chassis ground. (F7) No. Chassis ground: 8 CHECK POOR CONTACT. Check poor contact in main fan motor connector. Is the voltage more than 0 V? Go to step 4. Is the operation of the relay OK? Does the radiator main fan operate? Go to step 5. Is the voltage more than 0 V? Go to step 7. Is the resistance less than Ω? Is there poor contact in main fan motor connector? Repair open circuit in harness for power supply line. Replace A/C relay. Go to step 0. Go to step 6. Go to step 8. Repair poor contact in main fan motor connector. Repair open circuit in harness for power supply circuit. Repair open circuit in harness between main fan motor connector and chassis ground. Go to step 9. AC-8

31 DIAGNOSTICS FOR A/C SYSTEM FAILURE 9 CHECK MAIN FAN MOTOR. Connect battery positive (+) terminal to terminal No. and (turbo engine model) or (nonturbo engine model), and negative ( ) terminal to terminal No. of main fan motor connector. Does the main fan rotate? 0 CHECK OPERATION OF SUB FAN MOTOR. Check operation of sub fan motor. CHECK POWER SUPPLY TO SUB FAN MO- TOR. CAUTION: Be careful not to overheat engine during repair. )Turn ignition switch to OFF. )Disconnect connector from sub fan motor. )Start the engine, and warm it up until engine coolant temperature increases over 00 C ( F). 4)Stop the engine and turn ignition switch to ON. 5)Measure voltage between sub fan motor connector and chassis ground. Turbo engine model: (F6) No., (+) Chassis ground ( ): Non-turbo engine model: (F6) No. (+) Chassis ground ( ): CHECK GROUND CIRCUIT OF SUB FAN MOTOR. )Turn ignition switch to OFF. )Measure resistance between sub fan motor connector and chassis ground. (F6) No. Chassis ground: CHECK POOR CONTACT. Check poor contact in sub fan motor connector. Does the radiator sub fan operate? AC-9 Repair poor contact in main fan motor connector. Is the voltage more than 0 V? Go to step. Is the resistance less than Ω? Is there poor contact in sub fan motor connector? 4 CHECK SUB FAN MOTOR. Connect battery positive (+) terminal to terminal No. and (turbo engine model) or (nonturbo engine model), and negative ( ) terminal to terminal No. of sub fan motor connector. Does the sub fan rotate? 5 CHECK EACH SENSOR AND POTENTION METER. Check the sensors and potention meter for proper operation using the self-diagnostic function. <Ref. to AC-8, Diagnostics Chart for Diagnosis System.> 6 CHECK CONNECTION OF ASPIRATOR DUCT. Make sure that the connection of aspirator duct is correct. 7 CHECK EACH ACTUATOR. Check the actuators for proper operation using the self-diagnostic function.<ref. to AC-8, Diagnostics Chart for Diagnosis System.> 8 CHECK POOR CONTACT. Check poor contact in A/C control module. Step Check Yes No Is the operation of each sensor and potention meter normal? Is the connection of aspirator duct correct? Is the operation of each actuator normal? Is there poor contact in A/C control module? Replace main fan motor with a new one. Go to step 5. Go to step. Go to step. Repair poor contact in sub fan motor connector. Repair poor contact in sub fan motor connector. Go to step 6. Repair aspirator duct connection. Go to step 8. Repair poor contact in A/C control module. Repair open circuit in harness for power supply circuit. Repair open circuit in harness between sub fan motor connector and chassis ground. Go to step 4. Replace sub fan motor with a new one. Check the sensor and circuit. <Ref. to AC-6, Diagnostic Procedure for Sensors.> Go to step 7. Check the actuator and circuit. <Ref. to AC-0, Diagnostic Procedure for Actuators.> Contact with your Subaru distributor.

32 A5 A7 DIAGNOSTIC PROCEDURE FOR ACTUATORS 7. Diagnostic Procedure for Actuators A: INTAKE DOOR ACTUATOR TROUBLE SYMPTOM: FRESH/RECIRC mode is not changed. WIRING DIAGRAM: A: B8 B: B8 AUTO A/C CONTROL MODULE B9 INTAKE DOOR ACTUATOR B9 A: B HV008 AC-0

33 DIAGNOSTIC PROCEDURE FOR ACTUATORS Step Check Yes No CHECK FUSE. )Remove No. 7 fuse in fuse & relay box. )Check condition of fuse. Is the fuse blown-out? Replace fuse. Go to step. CHECK SIGNAL VOLTAGE. )Change air intake to RECIRC by pushing FRESH/RECIRC switch. )Measure voltage between A/C control module and chassis ground. (B8) No. 5 (+) Chassis ground ( ): CHECK SIGNAL VOLTAGE. )Change air intake to FRESH with pushing FRESH/RECIRC switch. )Measure voltage between A/C control module and chassis ground. (B8) No. 7 (+) Chassis ground ( ): 4 CHECK HARNESS CONNECTOR BETWEEN A/C CONTROL MODULE AND FRESH/RE- CIRC ACTUATOR. )Turn ignition switch to OFF. )Disconnect connector from A/C control module and intake door actuator. )Measure resistance of harness between A/C control module and intake door actuator. : (B8) No. 5 (B9) No. 5 CHECK HARNESS CONNECTOR BETWEEN A/C CONTROL MODULE AND FRESH/RE- CIRC ACTUATOR. Measure resistance of harness between A/C control module and intake door actuator. : (B8) No. 7 (B9) No. 6 CHECK POOR CONTACT. Check poor contact in A/C control module. Is the voltage less than V? Go to step. Repair short circuit in harness for power supply line. Is the voltage less than V? Go to step 4. Repair short circuit in harness for power supply line. Is the resistance less than Ω? Is the resistance less than Ω? Is there poor contact in A/C control module? Go to step 5. Go to step 6. Repair poor contact in A/C control module. Repair open circuit in harness between A/C control module and intake door actuator. Repair open circuit in harness between A/C control module and intake door actuator. Contact with your Subaru distributor. AC-

34 DIAGNOSTIC PROCEDURE FOR ACTUATORS B: MODE DOOR ACTUATOR TROUBLE SYMPTOM: Air flow outlet is not changed. WIRING DIAGRAM: A: B8 B: B8 AUTO A/C CONTROL MODULE B6 B77 A B MODE DOOR ACTUATOR B77 A: B B: B HV009 AC-

35 DIAGNOSTIC PROCEDURE FOR ACTUATORS CHECK POWER SUPPLY FOR AUTO A/C CONTROL MODULE SIDE. )Turn ignition switch ON. )Turn A/C switch ON. )Measure voltage between auto A/C control module harness connector terminal and chassis ground. (B8) No. 6 (+) Chassis ground ( ): CHECK POWER SUPPLY FOR ACTUATOR SIDE. Measure voltage between mode door actuator harness connector terminal and chassis ground. (B77) No. (+) Chassis ground ( ): CHECK SIGNAL FOR AUTO A/C CONTROL MODULE SIDE. Measure voltage between auto A/C control module harness connector terminal and chassis ground with oscilloscope. (B8) No. (+) Chassis ground ( ): 4 CHECK SIGNAL FOR ACTUATOR SIDE. Measure voltage between mode door actuator harness connector terminal and chassis ground. (B77) No. (+) Chassis ground ( ): Step Check Yes No 5 CHECK GROUND CIRCUIT OF ACTUATOR. )Turn ignition switch and A/C switch OFF. )Measure resistance between mode door actuator harness connector terminal and chassis ground. (B77) No. (+) Chassis ground ( ): Is the resistance less than Ω? 6 CHECK POOR CONTACT. Is there poor contact? Check poor contact in auto A/C control module and mode door actuator. Is the voltage more than 0V? Go to step. Replace auto A/C control module. Is the voltage more than 0V? Go to step. Repair open circuit in harness between auto A/C control module and mode door actuator. Is the voltage approx. 5.5V? Go to step 4. Replace auto A/C control module. Is the voltage approx. 5.5V? Go to step 5. Repair open circuit in harness between auto A/C control module and mode door actuator. Go to step 6. Repair poor contact. Repair open circuit in harness between mode door actuator and chassis ground. Contact with your Subaru distributor. AC-

36 DIAGNOSTIC PROCEDURE FOR ACTUATORS C: AIR MIX DOOR ACTUATOR TROUBLE SYMPTOM: Outlet air temperature is not changed. WIRING DIAGRAM: A: B8 B: B8 AUTO A/C CONTROL MODULE B5 B9 A4 B AIR MIX DOOR ACTUATOR B9 A: B B: B HV0040 AC-4

37 DIAGNOSTIC PROCEDURE FOR ACTUATORS CHECK POWER SUPPLY FOR AUTO A/C CONTROL MODULE SIDE. )Turn ignition switch ON. )Turn A/C switch ON. )Measure voltage between auto A/C control module harness connector terminal and chassis ground. (B8) No. 5 (+) Chassis ground ( ): CHECK POWER SUPPLY FOR ACTUATOR SIDE. Measure voltage between air mix door actuator harness connector terminal and chassis ground. (B9) No. (+) Chassis ground ( ): CHECK SIGNAL FOR AUTO A/C CONTROL MODULE SIDE. Measure voltage between auto A/C control module harness connector terminal and chassis ground with oscilloscope7. (B8) No. 4 (+) Chassis ground ( ): 4 CHECK SIGNAL FOR ACTUATOR SIDE. Measure voltage between air mix door actuator harness connector terminal and chassis ground with oscilloscope. (B9) No. (+) Chassis ground ( ): Step Check Yes No 5 CHECK GROUND CIRCUIT OF ACTUATOR. )Turn ignition switch and A/C switch OFF. )Measure resistance between air mix door actuator harness connector terminal and chassis ground. (B9) No. (+) Chassis ground ( ): Is the resistance less than Ω? 6 CHECK POOR CONTACT. Is there poor contact? Check poor contact in auto A/C control module and air mix door actuator. Is the voltage more than 0V? Go to step. Replace auto A/C control module. Is the voltage more than 0V? Go to step. Repair open circuit in harness between auto A/C control module and air mix door cutuator. Is the voltage approx. 5.5V? Go to step 4. Replace auto A/C control module. Is the voltage approx. 5.5V? Go to step 5. Repair open circuit in harness between auto A/C control module and air mix door actuator. Go to step 6. Repair poor contact. Repair open circuit in harness between air mix door actuator and chassis ground. Contact with your Subaru distributor. AC-5

38 DIAGNOSTIC PROCEDURE FOR SENSORS 8. Diagnostic Procedure for Sensors A: AMBIENT SENSOR TROUBLE SYMPTOM: Fan speed is not switched when the fan speed control dial is in AUTO position. WIRING DIAGRAM: AMBIENT SENSOR F78 4 F45 B6 B7 B9 : LHD MODEL: RHD MODEL: : LHD MODEL: RHD MODEL: A: B8 B: B8 AUTO A/C CONTROL MODULE : LHD MODEL: 4 RHD MODEL: 4 4 : LHD MODEL: 5 RHD MODEL: F78 B: B8 F45 RHD F45 LHD HV004 AC-6

39 DIAGNOSTIC PROCEDURE FOR SENSORS CHECK AMBIENT SENSOR. )Turn ignition switch to OFF. )Disconnect connector from ambient sensor. )Measure resistance between connector terminals of ambient sensor. Terminals: No. No. CHECK INPUT SIGNALS FOR AMBIENT SENSOR. )Turn ignition ON. )Measure voltage between (F78) connector terminals. : (F78) No. No. CHECK OUTPUT SIGNALS FROM A/C CON- TROL MODULE. )Turn ignition switch to OFF. )Pull out A/C control panel. )Disconnect connector from ambient sensor. 4)Turn ignition switch to ON. 5)Measure voltage between connector terminals of A/C control module. : (B8) No. 9 (+) No. 7 ( ) 4 CHECK HARNESS CONNECTOR BETWEEN A/C CONTROL MODULE AND AMBIENT SENSOR. )Turn ignition switch to OFF. )Disconnect connectors from A/C control module. )Measure resistance of harness between A/C control module and ambient sensor. LHD model: (F78) No. (B8) No. 9 RHD model: (F78) No. (B8) No. 9 5 CHECK HARNESS CONNECTOR BETWEEN A/C CONTROL MODULE AND AMBIENT SENSOR. Measure resistance of harness between A/C control module and ambient sensor. LHD model: (F78) No. (B8) No. 7 RHD model: (F78) No. (B8) No. 7 6 CHECK POOR CONTACT. Check poor contact in A/C control module. Step Check Yes No Is the resistance approx.. Go to step. kω at 5 C (77 F)? Replace ambient sensor. Is the voltage approx. 4.5 V? Go to step 6. Go to step. Is the voltage approx. 4.5 V? Go to step 6. Go to step 4. Is the resistance less than Ω? Is the resistance less than Ω? Is there poor contact in A/C control module? Go to step 5. Go to step 6. Repair poor contact in A/C control module. Repair open circuit in harness between A/C control module and ambient sensor. Repair open circuit in harness between A/C control module and ambient sensor. Contact with your Subaru distributor. AC-7

40 DIAGNOSTIC PROCEDURE FOR SENSORS B: IN-VEHICLE SENSOR TROUBLE SYMPTOM: When turning AUTO switch to ON, blower fan speed, outlet port and inlet port is not changed. If switch LED indicates that the sensor is malfunctioning, replace the A/C control module. The in-vehicle sensor is built into the A/C control module and cannot be replaced as a single unit. AC-8

41 DIAGNOSTIC PROCEDURE FOR SENSORS AC-9

42 B7 B7 DIAGNOSTIC PROCEDURE FOR SENSORS C: EVAPORATOR SENSOR WIRING DIAGRAM: EVAPORATION THRMO SWITCH B56 A: B8 B: B8 AUTO A/C CONTROL MODULE B56 B: B HV004 AC-40

43 DIAGNOSTIC PROCEDURE FOR SENSORS CHECK EVAPORATOR SENSOR. )Turn ignition switch to OFF. )Remove glove box. )Disconnect connector from evaporator sensor. 4)Measure resistance between connector terminals of evaporator sensor. Terminals: No. No. CHECK INPUT SIGNALS FOR EVAPORA- TOR SENSOR. )Turn ignition switch to ON. )Measure voltage between (B88) connector terminal and chassis ground. (B56) No. (+) Chassis ground ( ): CHECK OUTPUT SIGNALS FROM A/C CON- TROL MODULE. )Turn ignition switch to OFF. )Pull out A/C control module. )Turn ignition switch to ON. 4)Measure voltage between A/C control module connector terminals. : (B8) No. 7 (+) No. 7 ( ) 4 CHECK HARNESS CONNECTOR BETWEEN A/C CONTROL MODULE AND EVAPORA- TOR SENSOR. )Turn ignition switch to OFF. )Disconnect connectors from A/C control module. )Measure resistance of harness between A/C control module and evaporator sensor. : (B56) No. (B8) No. 7 5 CHECK HARNESS CONNECTOR BETWEEN A/C CONTROL MODULE AND EVAPORA- TOR SENSOR. Measure resistance of harness between A/C control module and evaporator sensor. : (B56) No. (B8) No. 7 6 CHECK POOR CONTACT. Check poor contact in A/C control module. Step Check Yes No Is the resistance approx.. Go to step. kω at 0 C (68 F)? Replace evaporator sensor. Is the voltage approx. 4.5 V? Go to step. Replace evaporator sensor. Is the voltage approx. 4.5 V? Go to step 4. Go to step 6. Is the resistance less than Ω? Is the resistance less than Ω? Is there poor contact in A/C control module? Go to step 5. Go to step 6. Repair poor contact in A/C control module. Repair open circuit in harness between A/C control module and evaporator sensor. Repair open circuit in harness between A/C control module and evaporator sensor. Contact with your Subaru distributor. AC-4

44 DIAGNOSTIC PROCEDURE FOR SENSORS AC-4

45 D: SUNLOAD SENSOR DIAGNOSTIC PROCEDURE FOR SENSORS TROUBLE SYMPTOM: Sensor identified that sunlight is at maximum. Then, A/C system is controlled to COOL side. Sensor identified that sunlight is at minimum. Then, A/C system is controlled to HOT side. NOTE: When the sunload sensor is checked indoors or in the shade, open circuit might be indicated. Always check the sunload sensor at a place where sun shines directly on it. AC-4

46 B7 B6 DIAGNOSTIC PROCEDURE FOR SENSORS WIRING DIAGRAM: SUNLOAD SENSOR i5 A: B8 B: B8 AUTO A/C CONTROL MODULE i5 B: B HV004 AC-44

47 DIAGNOSTIC PROCEDURE FOR SENSORS CHECK SUNLOAD SENSOR. )Turn ignition switch to OFF. )Remove sunload sensor. <Ref. to AC-5, INSTALLATION, Sun-load Sensor (Auto A/ C).> )Measure resistance between sunload sensor terminals. Terminals: No. No. CHECK SUNLOAD SENSOR. Make sure that there is no resistance in the reverse side terminals. Terminals: No. No. CHECK INPUT VOLTAGE TO SUNLOAD SENSOR. )Turn ignition switch to ON. )Measure input voltage to sunload sensor. : (i5) No. (+) No. ( ) 4 CHECK HARNESS CONNECTOR BETWEEN A/C CONTROL MODULE AND SUNLOAD SENSOR. )Turn ignition switch to OFF. )Disconnect connectors from A/C control module. )Measure resistance of harness between A/C control module and sunload sensor. : (i5) No. (B8) No. 6 5 CHECK HARNESS CONNECTOR BETWEEN A/C CONTROL MODULE AND SUNLOAD SENSOR. Measure resistance of harness between A/C control module and sunload sensor. : (i5) No. (B8) No. 7 6 CHECK POOR CONTACT. Check poor contact in A/C control module. Step Check Yes No Is the resistance less than Go to step. Ω? Is the resistance more than MΩ? Go to step. Replace sunload sensor. Replace sunload sensor. Is the voltage approx. 4.5 V? Go to step 6. Go to step 4. Is the resistance less than Ω? Is the resistance less than Ω? Is there poor contact in A/C control module? Go to step 5. Go to step 6. Repair poor contact in A/C control module. Repair open circuit in harness between A/C control module and sunload sensor. Repair open circuit in harness between A/C control module and sunload sensor. Contact with your Subaru distributor. AC-45

48 SYMPTOM RELATED DIAGNOSTIC 9. Symptom Related Diagnostic A: GENERAL DIAGNOSTICS TABLE Component parts Symptom A/C system fails to operate when IG SW is turned "ON". Burned-out fuse. Illumination does not dim at night. Blower motor does not rotate or rotates erroneously. A/C does not change from "Fresh" to "Recirc" or vise versa. Air outlet cannot be switched. Compartment temperature does not increase (No hot air is discharged). Compartment temperature does not decrease (No cool air is discharged). Compartment temperature is higher than or lower than the set value. Compartment temperature does not quickly respond to the set value. Condenser fan does not operate during A/C operation. Fuses (M/B No. 5, F/B No. 7) Poor connector contacts Ground A/C control module Air mix door actuator and potention meter (including links) Mode door actuator and potention meter (including links) Intake door actuator and potention meter (including links) Blower fan motor Blower fan relay A/C relay Magnet clutch Radiator fan motors (Main and sub) Radiator fan relays (Main and sub) Sensors (In-vehicle, ambient, water temperature, evaporator, sunload, etc.) In-vehicle sensor aspirator duct HV0044 AC-46