Air Conditioning: Overview Toyota 4Runner IV рестайлинг

DESCRIPTION

This sensor detects the temperature inside the cabin and sends appropriate signals to the A/C amplifier.

VOLTAGE SPECIFICATIONS

Scheme 1

Scheme 2

Scheme 3

Scheme 4

1. INSPECT AIR CONDITIONING AMPLIFIER (TR, SG) Remove the A/C amplifier with the connectors still connected. Turn the ignition switch ON. Measure the voltage according to the value(s) in «AIR CONDITIONING AMPLIFIER (TR, SG)»(ref-280565-S34825516812008022200000). Standard voltage AIR CONDITIONING AMPLIFIER (TR, SG) Tester Connection (Symbols) Condition Specified Condition A16-15 (TR) - A16-6 (SG) Ignition switch ON at 25°C (77°F) 1.8 to 2.2 V A16-15 (TR) - A16-6 (SG) Ignition switch ON at 40°C (104°F) 1.2 to 1.6 V HINT: As the temperature increases, the voltage decreases. OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-280565-S33963517772008022200000) NG: GO TO NEXT STEP
2. INSPECT COOLER THERMISTOR (ROOM TEMPERATURE SENSOR) Remove the cooler thermistor (room temp. sensor). Measure the resistance according to the value(s) in «COOLER THERMISTOR (ROOM TEMPERATURE SENSOR)»(ref-280565-S33956828692008022200000). Standard resistance COOLER THERMISTOR (ROOM TEMPERATURE SENSOR) Tester Connection Condition Specified Condition A19-1 - A19-2 10°C (50°F) 3.00 to 3.73 kohms A19-1 - A19-2 15°C (59°F) 2.45 to 2.88 kohms A19-1 - A19-2 20°C (68°F) 1.95 to 2.30 kohms A19-1 - A19-2 25°C (77°F) 1.60 to 1.80 kohms A19-1 - A19-2 30°C (86°F) 1.28 to 1.47 kohms A19-1 - A19-2 35°C (95°F) 1.00 to 1.22 kohms A19-1 - A19-2 40°C (104°F) 0.80 to 1.00 kohms A19-1 - A19-2 45°C (113°F) 0.65 to 0.85 kohms A19-1 - A19-2 50°C (122°F) 0.50 to 0.70 kohms A19-1 - A19-2 55°C (131°F) 0.44 to 0.60 kohms A19-1 - A19-2 60°C (140°F) 0.36 to 0.50 kohms NOTE: Even slightly touching the sensor may change the resistance value. Be sure to hold the connector of the sensor. When measuring the sensor temperature, it must be the same as the ambient temperature. HINT: As the temperature increases, the resistance decreases (Scheme 4) NG: REPLACE COOLER THERMISTOR (ROOM TEMPERATURE SENSOR) OK: GO TO NEXT STEP
3. CHECK HARNESS AND CONNECTOR (COOLER THERMISTOR (ROOM TEMPERATURE SENSOR) - A/C AMPLIFIER) Check for open and short circuit in the harness and the connector between the cooler thermistor (room temp, sensor) and the A/C amplifier (See «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-280562-S30988147692008022200000) ). NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: GO TO NEXT STEP
4. CHECK DTC Start up the DTC check mode. Check that DTC 11 is not output again. Result DTC RESULT REFERENCE Result Proceed to DTC 11 is output. A DTC 11 Is not output. B B: SYSTEM IS OK A: REPLACE AIR CONDITIONING AMPLIFIER

This sensor detects the temperature outside the cabin and sends appropriate signals to the A/C amplifier.

DESCRIPTION REFERENCE TABLE

Scheme 5

Scheme 6

Scheme 7

1. INSPECT AIR CONDITIONING AMPLIFIER (TAM, SG) Remove the A/C amplifier with the connectors still connected. Turn the ignition switch ON. Measure the voltage according to the value(s) in «AIR CONDITIONING AMPLIFIER (TAM, SG)»(ref-280565-S03593856352008022200000). Standard voltage AIR CONDITIONING AMPLIFIER (TAM, SG) Tester Connection (Symbols) Condition Specified Condition A16-22 (TAM) - A16-6 (SG) Ignition switch ON at 25°C (77°F) 1.4 to 1.8 V A16-22 (TAM) - A16-6 (SG) Ignition switch ON at 40°C (104°F) 0.9 to 1.3 V HINT: As the temperature increases, the voltage decreases. OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-280565-S33963517772008022200000) NG: GO TO NEXT STEP
2. INSPECT THERMISTOR ASSEMBLY (AMBIENT TEMPERATURE SENSOR) Remove the thermistor assembly (ambient temp, sensor). Measure the resistance according to the value(s) in «THERMISTOR ASSEMBLY (AMBIENT TEMPERATURE SENSOR)»(ref-280565-S01610146652008022200000). Standard resistance THERMISTOR ASSEMBLY (AMBIENT TEMPERATURE SENSOR) Tester Connection Condition Specified Condition A1-1 - A1-2 10°C (50°F) 3.00 to 3.73 kohms A1-1 - A1-2 15°C (59°F) 2.45 to 2.88 kohms A1-1 - A1-2 20°C (68°F) 1.95 to 2.30 kohms A1-1 - A1-2 25°C (77°F) 1.60 to 1.80 kohms A1-1 - A1-2 30°C (86°F) 1.28 to 1.47 kohms A1-1 - A1-2 35°C (95°F) 1.00 to 1.22 kohms A1-1 - A1-2 40°C (104°F) 0.80 to 1.00 kohms A1-1 - A1-2 45°C (113°F) 0.65 to 0.85 kohms A1-1 - A1-2 50°C (122°F) 0.50 to 0.70 kohms A1-1 - A1-2 55°C (131°F) 0.44 to 0.60 kohms A1-1 - A1-2 60°C (140°F) 0.36 to 0.50 kohms NOTE: Even slightly touching the sensor may change the resistance value. Be sure to hold the connector of the sensor. When measuring the sensor temperature, it must be the same as the ambient temperature. HINT: As the temperature increases, the resistance decreases see scheme 38 NG: REPLACE THERMISTOR ASSEMBLY OK: GO TO NEXT STEP
3. CHECK HARNESS AND CONNECTOR (THERMISTOR ASSEMBLY (AMBIENT TEMP. SENSOR) - A/C AMPLIFIER) Check for open and short circuit in the harness and the connector between the thermistor assembly (ambient temp, sensor) and the A/C amplifier (See «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-280562-S30988147692008022200000) ). NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: GO TO NEXT STEP
4. CHECK DTC Start up the DTC check mode. Check that DTC 12 is not output again. Result DTC RESULT REFERENCE TABLE Result Proceed to DTC 12 is output. A DTC 12 is not output. B B: SYSTEM IS OK A: REPLACE AIR CONDITIONING AMPLIFIER

This sensor detects the temperature inside the cooling unit and sends appropriate signals to the A/C amplifier.

DTC DESCRIPTION

Scheme 8

Scheme 9

Scheme 10

Scheme 11

1. INSPECT AIR CONDITIONING AMPLIFIER (TE, SG) Remove the A/C amplifier with the connectors still connected. Turn the ignition switch ON. Measure the voltage according to the value(s) in «AIR CONDITIONING AMPLIFIER (TE, SG)»(ref-280565-S39322986722008022200000). Standard voltage AIR CONDITIONING AMPLIFIER (TE, SG) Tester Connection (Symbols) Condition Specified Condition A16-24 (TE) - A16-6 (SG) Ignition switch ON at 0°C (32°F) 2.0 to 2.4 V A16-24 (TE) - A16-6 (SG) Ignition switch ON at 15°C (59°F) 1.4 to 1.8 V OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-280565-S33963517772008022200000) NG: GO TO NEXT STEP
2. INSPECT COOLER THERMISTOR NO. 1 (EVAPORATOR TEMPERATURE SENSOR) Remove the cooler thermistor No. 1 (evaporator temp, sensor). Measure the resistance according to the value(s) in «COOLER THERMISTOR NO. 1 (EVAPORATOR TEMPERATURE SENSOR)»(ref-280565-S34949603012008022200000). Standard resistance COOLER THERMISTOR NO. 1 (EVAPORATOR TEMPERATURE SENSOR) Tester Connection Condition Specified Condition A18-1 - A18-2 -10°C (14°F) 7.30 to 9.10 kohms A18-1 - A18-2 -5°C (23°F) 5.65 to 6.95 kohms A18-1 - A18-2 0°C (32°F) 4.40 to 5.35 kohms A18-1 - A18-2 5°C (41°F) 3.40 to 4.15 kohms A18-1 - A18-2 10°C (50°F) 2.70 to 3.25 kohms A18-1 - A18-2 15°C (59°F) 2.14 to 2.58 kohms A18-1 - A18-2 20°C (68°F) 1.71 to 2.05 kohms A18-1 - A18-2 25°C (77°F) 1.38 to 1.64 kohms A18-1 - A18-2 30°C (86°F) 1.11 to 1.32 kohms NOTE: Even slightly touching the sensor may change the resistance value. Be sure to hold the connector of the sensor. When measuring the sensor temperature, it must be the same as the ambient temperature. HINT: As the temperature increases, the resistance decreases (Scheme 11) NG: REPLACE COOLER THERMISTOR NO. 1 (EVAPORATOR TEMPERATURE SENSOR) OK: GO TO NEXT STEP
3. CHECK HARNESS AND CONNECTOR (COOLER THERMISTOR NO. 1 - A/C AMPLIFIER) Check for open and short in the harness and the connector between the cooler thermistor No. 1 (evaporator temp, sensor) and the A/C amplifier (See «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-280562-S30988147692008022200000) ). NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: GO TO NEXT STEP
4. CHECK DTC Start up the DTC check mode. Check that DTC 13 is not output again. Result DTC RESULT REFERENCE Result Proceed to DTC 13 Is output. A DTC 13 Is not output. B B: SYSTEM IS OK A: REPLACE AIR CONDITIONING AMPLIFIER

This circuit converts the resistance of the engine coolant temperature sensor into a pulse signal and transmits to the A/C amplifier.

DESCRIPTION REFERENCE

Scheme 12

Scheme 13

Scheme 14

1. CHECK DTC Check that DTC P0115 is not output. Result DTC RESULT REFERENCE Result Proceed to DTC P0115 Is not output. A DTC P0115 Is output. B B: GO TO «ENGINE CONTROL SYSTEM (1GR-FE)»(/toyota/4runner/iv-2005-2009/remont/testing-diagnostics/#engine-control-system-1gr-fe) and/or «ENGINE CONTROL SYSTEM (2UZ-FE)»(/toyota/4runner/iv-2005-2009/remont/testing-diagnostics/#engine-control-system-2uz-fe) A: GO TO NEXT STEP
2. INSPECT ECM (THWO) Remove the ECM with the connectors still connected. Turn the ignition switch ON. Measure the waveform between terminal THWO of the ECM connector and body ground. OK: Pulse generation HINT: The correct waveform is as shown below. The waveform frequency "A" becomes longer as the engine coolant temperature becomes higher, as shown in «ECM (THWO)»(ref-280565-S25010643782008022200000). ECM (THWO) Engine coolant temperature Frequency "A" Below 30°C (86°F) 16 ms Approx. 75°C (167°F) 102 ms 90°C to 100°C (194°F to 212°F) 262 ms NG: REPLACE ECM OK: GO TO NEXT STEP
3. CHECK HARNESS AND CONNECTOR (ECM - AIR CONDITIONING AMPLIFIER) Check for open and short circuit in the harness and the connector between the ECM and the A/C amplifier (See «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-280562-S30988147692008022200000) ). Result ECM - AIR CONDITIONING AMPLIFIER Result Proceed to NG A OK (when checking using PROBLEM SYMPTOMS TABLE) B OK (when checking using DTC) B B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-280565-S33963517772008022200000) C: REPAIR OR REPLACE HARNESS OR CONNECTOR A: REPLACE AIR CONDITIONING AMPLIFIER

A photodiode in the cooler (solar sensor) thermistor detects solar radiation and sends signals to the A/C amplifier.

Scheme 15

DTC TROUBLE AREA REFERENCE

Scheme 16

This sensor sends 4 pulses par engine revolution to the A/C amplifier. If the ratio of the compressor speed divided by the engine speed is smaller than a predetermined value, the A/C amplifier turns the compressor off, and the indicator flashes at about 1 sec. intervals.

DESCRIPTION REFERENCE

Scheme 17

Scheme 18

Scheme 19

Scheme 20

1. INSPECT AIR CONDITIONING AMPLIFIER (LOCK) Remove the A/C amplifier with the connectors still connected. Turn the ignition switch ON. Turn the A/C switch ON. Measure the waveform between terminal LOCK (A16-19) and terminal SG (A16-6) of the A/C amplifier. OK: Waveform appears (Scheme 19) Result RESULT REFERENCE TABLE Result Proceed to NG A OK (Checking from DTC) B OK (When checking from the PROBLEM SYMPTOMS TABLE) C B: REPLACE AIR CONDITIONING AMPLIFIER C: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-280565-S33963517772008022200000) A: GO TO NEXT STEP
2. INSPECT COOLER COMPRESSOR ASSEMBLY Disconnect the connector from the cooler compressor assembly. Measure the resistance according to the value(s) in «COOLER COMPRESSOR ASSEMBLY»(ref-280565-S20620502832008022200000). Standard resistance COOLER COMPRESSOR ASSEMBLY Tester Connection Condition Specified Condition A2-1-A2-2 at 20°C (68°F) 165 to 205 ohms NG: REPLACE COOLER COMPRESSOR ASSEMBLY OK: GO TO NEXT STEP
3. CHECK HARNESS AND CONNECTOR (COOLER COMPRESSOR ASSEMBLY - A/C AMPLIFIER) Check for open and short circuit in the harness and the connector between the cooler compressor assembly and the A/C amplifier (See «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-280562-S30988147692008022200000) ). NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE AIR CONDITIONING AMPLIFIER

The pressure switch sends appropriate signals to the A/C amplifier when the A/C refrigerant pressure drops too low or rises too high. When the A/C amplifier receives these signals, it outputs signals via the A/C amplifier to switch OFF the compressor relay and turn OFF the magnetic clutch.

DTC DESCRIPTION

Scheme 21

Scheme 22

1. INSPECT REFRIGERANT PRESSURE Set the manifold gauge (See «ON-VEHICLE INSPECTION»(ref-280565-S07672468112008022200000) ). Read the manifold gauge pressure when these conditions are established. Test conditions: Temperature at the air inlet with the switch set at RECIRC is 30 to 35°C (86 to 95°F) Engine running at 1,500 rpm Blower speed control switch at "HI" position Temperature control dial at "COOL" position Air conditioning switch ON Fully open doors Standard: Pressure on high pressure side: 1.37 to 1.57 MPa (13.9 to 16.0 kgf*cm 2, 198 to 228 psi) HINT: If the refrigerant pressure is below 196 kPa (2.0 kgf*cm 2, 28 psi), the refrigerant amount in the air conditioning cycle may have decreased significantly for reasons such as a gas leakage. NG: REPAIR OR REPLACE AIR CONDITIONING CYCLE OK: GO TO NEXT STEP
2. CHECK AIR CONDITIONING OPERATION Disconnect the pressure switch connector. Connect terminals 1 and 2 of the connector of the pressure switch on the vehicle wire harness side using a service wire. Start the engine. Turn the air conditioning switch on and check that the magnetic clutch is turned on. Check that the magnetic clutch is turned off when disconnecting terminals 1 and 2 (that are connected in the prior step). OK: Terminals 1 and 2 connected: the compressor is operated Terminals 1 and 2 disconnected: the compressor is not operated NG: Go to step 3 OK: REPLACE PRESSURE SWITCH
3. CHECK HARNESS AND CONNECTOR (PRESSURE SWITCH - AIR CONDITIONING AMPLIFIER) Check for open and short circuit in the harness and the connector between the pressure switch and the A/C amplifier (See «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-280562-S30988147692008022200000) ). NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: GO TO NEXT STEP
4. CHECK DTC Start up the DTC check mode. Check that DTC 23 is not output again. Result DTC RESULT REFERENCE Result Proceed to DTC 23 is output. A DTC 23 Is not output. (Checking from the DTC) B DTC 23 Is not output. (Checking from the PROBLEM SYMPTOMS TABLE) C B: SYSTEM IS OK C: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-280565-S33963517772008022200000) A: REPLACE AIR CONDITIONING AMPLIFIER

A photodiode in the solar sensor detects solar radiation and sends signals to the A/C amplifier.

HINT

This DTC is indicated only for limited grade (right/left independent temperature control system).

DTC DESCRIPTION

Scheme 23

This sensor detects the position of the air mix damper and sends the appropriate signals to the A/C amplifier. The position sensor is built into the damper servo sub-assembly (air mix control servo motor).

Scheme 24

DTC DESCRIPTION

Scheme 25

Scheme 26

Scheme 27

Scheme 28

Scheme 29

Scheme 30

1. INSPECT AIR CONDITIONING AMPLIFIER (TP, TPDR, SG) Remove the A/C amplifier with the connectors still connected. Turn the ignition switch ON. Change the set temperature to activate the air mix damper. Measure the voltage according to the value(s) in «AIR CONDITIONING AMPLIFIER (TP, TPDR, SG)»(ref-280565-S34066172682008022200000). Standard voltage: SR-5 grade AIR CONDITIONING AMPLIFIER (TP, TPDR, SG) (SR-5 GRADE) Tester Connection (Symbols) Condition Specified Condition A16-25 (TP) - A16-6 (SG) Ignition switch ON MAX. HOT position 0.5 to 1.8 V A16-25 (TP) - A16-6 (SG) Ignition switch ON MAX. COLD position 3.5 to 5.5 V Limited grade AIR CONDITIONING AMPLIFIER (TP, TPDR, SG) (LIMITED GRADE) Tester Connection (Symbols) Condition Specified Condition A16-23 (TPPA) - A16-6 (SG) Ignition switch ON MAX. HOT position 0.5 to 1.8 V A16-23 (TPPA) - A16-6 (SG) Ignition switch ON MAX. COLD position 3.5 to 5.5 V HINT: As the set temperature increases, the voltage decreases gradually without interruption. OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-280565-S33963517772008022200000) NG: GO TO NEXT STEP
2. INSPECT DAMPER SERVO SUB-ASSEMBLY Remove the damper servo sub-assembly. Disconnect the connector from the damper servo sub-assembly. Measure the resistance according to the value(s) in «DAMPER SERVO SUB-ASSEMBLY (1 OF 2)»(ref-280565-S25383118932008022200000). Standard resistance DAMPER SERVO SUB-ASSEMBLY (1 OF 2) Tester Connection Condition Specified Condition 1-2 Always 4.2 to 7.8 ohms Measure the resistance according to the value(s) in «DAMPER SERVO SUB-ASSEMBLY (2 OF 2)»(ref-280565-S22731873912008022200000). Standard resistance DAMPER SERVO SUB-ASSEMBLY (2 OF 2) Tester Connection Condition Specified Condition 3-2 MAX, COLD position 3.4 to 6.2 kohms 3-2 MAX. HOT position 0.8 to 1.6 kohms As the pamper servo sub-assembly moves from COLD side to HOT side, the resistance decreases gradually without interruption. For details regarding operation of the servo motor (See «INSPECTION PROCEDURE»(ref-280565-S19394065912008022200000) ) NG: REPLACE DAMPER SERVO SUB-ASSEMBLY OK: GO TO NEXT STEP
3. CHECK HARNESS AND CONNECTOR (AIR MIX DAMPER POSITION SENSOR - A/C AMPLIFIER) Check for open and short in the harness and the connector between the damper servo sub-assembly (air mix damper position sensor) and the A/C amplifier (See «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-280562-S30988147692008022200000) ). NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: GO TO NEXT STEP
4. CHECK DTC Start up the DTC check mode. Check that DTC 31 is not output again. Result DTC RESULT REFERENCE Result Proceed to DTC 31 is output. A DTC 31 is not output. B B: SYSTEM IS OK A: REPLACE AIR CONDITIONING AMPLIFIER

This sensor detects the position of the air inlet damper and sends appropriate signals to the A/C amplifier. The position sensor is built into the blower damper servo sub-assembly (air inlet damper control servo motor).

DTC DESCRIPTION

Scheme 31

Scheme 32

Scheme 33

Scheme 34

Scheme 35

1. INSPECT AIR CONDITIONING AMPLIFIER (TPI, SG) Remove the A/C amplifier with the connectors still connected. Turn the ignition switch ON. Change the set RECIRCULATION/FRESH to activate the blower damper. Measure the voltage according to the value(s) in «AIR CONDITIONING AMPLIFIER (TPI, SG)»(ref-280565-S36831000782008022200000). Standard voltage AIR CONDITIONING AMPLIFIER (TPI, SG) Tester Connection (Symbols) Condition Specified Condition A16-16 (TPI) - A16-6 (SG) Ignition switch ON RECIRCULATION position 3.5 to 4.5 V A16-16 (TPI) - A16-6 (SG) Ignition switch ON FRESH position 0.5 to 1.8 V HINT: As the blower damper is moved from RECIRCULATION side to FRESH side, the voltage decreases gradually without interruption. OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-280565-S33963517772008022200000) NG: GO TO NEXT STEP
2. INSPECT BLOWER DAMPER SERVO SUB-ASSEMBLY Remove the blower damper servo sub-assembly. Disconnect the connector from the blower damper servo sub-assembly. Measure the resistance according to the value(s) in «BLOWER DAMPER SERVO SUB-ASSEMBLY (1 OF 2)»(ref-280565-S10234414922008022200000). Standard resistance BLOWER DAMPER SERVO SUB-ASSEMBLY (1 OF 2) Tester Connection Condition Specified Condition 1-2 Always 4.2 to 7.8 kohms Measure the resistance according to the value(s) in «BLOWER DAMPER SERVO SUB-ASSEMBLY (2 OF 2)»(ref-280565-S10582455132008022200000). Standard resistance BLOWER DAMPER SERVO SUB-ASSEMBLY (2 OF 2) Tester Connection Condition Specified Condition 3-2 RECIRCULATION position 0.8 to 1.6 kohms 3-2 FRESH position 3.4 to 6.2 kohms As the blower damper servo sub-assembly moves from FRESH side to RECIRCULATION side, the resistance decreases gradually without interruption. HINT: For details regarding operation of the servo motor (See «DTC 43 AIR OUTLET DAMPER CONTROL SERVO MOTOR CIRCUIT»(ref-280565-S30988122382008022200000) ). NG: REPLACE BLOWER DAMPER SERVO SUB-ASSEMBLY OK: GO TO NEXT STEP
3. CHECK HARNESS AND CONNECTOR (AIR INLET DAMPER POSITION SENSOR - A/C AMPLIFIER) Check for open and short circuit in the harness and the connector between the blower damper servo sub-assembly (air inlet damper position sensor) and the A/C amplifier (See «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-280562-S30988147692008022200000) ). NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: GO TO NEXT STEP
4. CHECK DTC Start up the DTC check mode. Check that DTC 32 is not output again. Result DTC RESULT REFERENCE Result Proceed to DTC 32 Is output. A DTC 32 Is not output. B B: SYSTEM IS OK A: REPLACE AIR CONDITIONING AMPLIFIER

This sensor detects the position of the air outlet damper and sends appropriate signals to the A/C amplifier. The position sensor is built into the mode damper servo sub-assembly (air outlet servo motor).

DESCRIPTION REFERENCE

Scheme 36

Scheme 37

Scheme 38

Scheme 39

Scheme 40

1. INSPECT AIR CONDITIONING AMPLIFIER (TPO, SG) Remove the A/C amplifier with the connectors still connected. Turn the ignition switch ON. Change the set air flow mode to activate the mode damper servo sub-assembly. Measure the voltage according to the value(s) in «AIR CONDITIONING AMPLIFIER (TPO, SG)»(ref-280565-S28905480752008022200000). Standard voltage AIR CONDITIONING AMPLIFIER (TPO, SG) Tester Connection (Symbols) Condition Specified Condition A16-17 (TPO) - A16-6 (SG) Ignition switch ON FACE position 3.5 to 4.5 V A16-17 (TPO) - A16-6 (SG) Ignition switch ON DEF position 0.5 to 1.5 V HINT: As the mode damper is moved from FACE side to DEF side, the voltage decreases gradually without interruption. OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-280565-S33963517772008022200000) NG: GO TO NEXT STEP
2. INSPECT MODE DAMPER SERVO SUB-ASSEMBLY Remove the mode damper servo sub-assembly. Disconnect the connector from the mode damper servo sub-assembly. Measure the resistance according to the value(s) in «MODE DAMPER SERVO SUB-ASSEMBLY (1 OF 2)»(ref-280565-S36221653982008022200000). Standard resistance MODE DAMPER SERVO SUB-ASSEMBLY (1 OF 2) Tester Connection Condition Specified Condition 1-2 Always 4.2 to 7.8 kohms Measure the resistance according to the value(s) in «MODE DAMPER SERVO SUB-ASSEMBLY (2 OF 2)»(ref-280565-S22901076962008022200000). Standard resistance MODE DAMPER SERVO SUB-ASSEMBLY (2 OF 2) Tester Connection Condition Specified Condition 3-2 FACE position 0.8 to 1.6 kohms 3-2 DEF position 3.4 to 6.2 kohms As the mode damper servo sub-assembly moves from DEF side to FACE side, the resistance decreases gradually without interruption. HINT: For details regarding operation of the servo motor (See «DTC 46 AIR MIX DAMPER CONTROL SERVO MOTOR CIRCUIT (DRIVER SIDE)»(ref-280565-S05574647052008022200000) ). NG: REPLACE MODE DAMPER SERVO SUB-ASSEMBLY OK: GO TO NEXT STEP
3. CHECK HARNESS AND CONNECTOR (AIR OUTLET DAMPER POSITION SENSOR - A/C AMPLIFIER) Check for open and short circuit in the harness and the connector between the mode damper servo sub-assembly (air outlet damper position sensor) and the A/C amplifier (See «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-280562-S30988147692008022200000) ). NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: GO TO NEXT STEP
4. CHECK DTC Start up the DTC check mode. Check that DTC 33 is not output again. Result DTC RESULT REFERENCE Result Proceed to DTC 33 is output. A DTC 33 is not output. B B: SYSTEM IS OK A: REPLACE AIR CONDITIONING AMPLIFIER

This sensor detects the position of the air mix damper and sends the appropriate signals to the A/C amplifier. The position sensor is built into the damper servo sub-assembly (air mix damper control servo motor).

HINT

This DTC is indicated only for limited grade (right/left independent temperature control system).

DESCRIPTION REFERENCE

Scheme 41

Scheme 42

Scheme 43

Scheme 44

1. INSPECT AIR CONDITIONING AMPLIFIER (TPDR, SG) Remove the A/C amplifier with the connectors still connected. Turn the ignition switch ON. Change the set temperature to activate the air mix damper. Measure the voltage according to the value(s) in «AIR CONDITIONING AMPLIFIER (TPDR, SG)»(ref-280565-S35572856422008022200000). Standard voltage AIR CONDITIONING AMPLIFIER (TPDR, SG) Tester Connection (Symbols) Condition Specified Condition A16-25 (TPDR) - A16-6 (SG) Ignition switch ON MAX. COLD position 3.5 to 4.5 V A16-2S (TPDR) - A16-6 (SG) Ignition switch ON MAX. HOT position 0.5 to 1.8 V HINT: As the set temperature increases, the voltage decreases gradually without interruption. OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-280565-S33963517772008022200000) NG: GO TO NEXT STEP
2. INSPECT DAMPER SERVO SUB-ASSEMBLY Remove the damper servo sub-assembly. Disconnect the connector from the damper servo sub-assembly. Measure the resistance according to the value(s) in «DAMPER SERVO SUB-ASSEMBLY (1 OF 2)»(ref-280565-S12046255102008022200000). Standard resistance DAMPER SERVO SUB-ASSEMBLY (1 OF 2) Tester Connection Condition Specified Condition 1-2 Always 4.2 to 7.8 kohms Measure the resistance according to the value(s) in «DAMPER SERVO SUB-ASSEMBLY (2 OF 2)»(ref-280565-S09761382672008022200000). Standard resistance DAMPER SERVO SUB-ASSEMBLY (2 OF 2) Tester Connection Condition Specified Condition 3-2 MAX. COLD position 3.4 to 6.2 kohms 3-2 MAX. HOT position 0.8 to 1.6 kohms As the damper servo sub-assembly moves from COLD side to HOT side, the resistance decreases gradually without interruption. HINT: For details regarding operation of the servo motor (See «DTC 46: AIR MIX DAMPER CONTROL SERVO MOTOR CIRCUIT (DRIVER SIDE)»(ref-280565-S05574647052008022200000) ). NG: REPLACE DAMPER SERVO SUB-ASSEMBLY OK: GO TO NEXT STEP
3. CHECK HARNESS AND CONNECTOR (AIR MIX DAMPER POSITION SENSOR - A/C AMPLIFIER) Check for open and short circuit in the harness and the connector between the damper servo sub-assembly (air mix damper position sensor) and the A/C amplifier (See «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-280562-S30988147692008022200000) ). NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: GO TO NEXT STEP
4. CHECK DTC Start up the DTC check mode. Check that DTC 36 is not output again. Result DTC RESULT REFERENCE Result Proceed to DTC 36 is output. A DTC 36 Is not output. B B: SYSTEM IS OK A: REPLACE AIR CONDITIONING AMPLIFIER

This damper servo sub-assembly (air mix damper control servo motor) is controlled by the A/C amplifier and moves the air mix damper to the desired position.

DESCRIPTION REFERENCE

Scheme 45

The blower damper servo sub-assembly (air inlet damper control servo motor) is controlled by the A/C amplifier and moves the air inlet damper to the desired position.

DESCRIPTION REFERENCE

Scheme 46

This circuit turns the servo motor and changes each mode damper position by the signals from the A/C amplifier. When the AUTO switch is on, the A/C amplifier changes the mode automatically between (FACE), (BI-LEVEL) and (FOOT) according to the temperature setting.

DTC DESCRIPTION

Scheme 47

The damper servo sub-assembly (air mix damper control servo motor) is controlled by the A/C amplifier and moves the air mix damper to the desired position.

HINT

This DTC is displayed for only limited grade (right/left independent temperature control system).

DTC DESCRIPTION

Scheme 48

Scheme 49

1. PERFORM ACTUATOR CHECK Operate the A/C control panel to enter the actuator check mode (See «ACTUATOR CHECK»(ref-280565-S20309190522008022200000) ). Press the DEF switch to enter the step operation. Check the air flow temperature by hand. AIR MIX DAMPER OPERATION Display Code Air Mix Damper Operation 0 COLD side (0% open) 1 COLD side (0% open) 2 COLD side (0% open) 3 COLD/HOT (50% open) 4 COLD/HOT (50% open) 5 COLD/HOT (50% open) 6 COLD/HOT (50% open) 7 HOT side (100% open) 8 HOT side (100% open) 9 HOT side (100% open) OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-280565-S33963517772008022200000) NG: GO TO NEXT STEP
2. INSPECT DAMPER SERVO SUB-ASSEMBLY Remove the damper servo sub-assembly. Connect the battery positive (+) lead to terminal 4 and the battery negative (-) lead to terminal 5, then check that the lever turns to "COLD" side smoothly. Connect the battery positive (+) lead to terminal 5 and the battery negative (-) lead to terminal 4, then check that the lever turns to "HOT" side smoothly. OK: Motor operates smoothly. NG: REPLACE DAMPER SERVO SUB-ASSEMBLY OK: GO TO NEXT STEP
3. CHECK HARNESS AND CONNECTOR (DAMPER SERVO SUB-ASSEMBLY AMPLIFIER) Check for open and short in the harness and the connector between the damper servo sub-assembly (air mix damper control servo motor) and the A/C amplifier (See «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-280562-S30988147692008022200000) ). NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: GO TO NEXT STEP
4. CHECK DTC Start up the DTC check mode. Check that DTC 46 is not output again. Result DTC RESULT REFERENCE Result Proceed to DTC 46 Is output. A DTC 46 is not output. B B: SYSTEM IS OK A: REPLACE AIR CONDITIONING AMPLIFIER

This A/C amplifier monitors the vehicle speed through signals sent from the speed sensor. The A/C amplifier uses these signals to receive the ambient temperature sensor signal.

Scheme 50

Scheme 51

Scheme 52

1. INSPECT AIR CONDITIONING AMPLIFIER (SPD) Remove the A/C amplifier with the connectors still connected. Shift the shift lever to neutral. Lift up the vehicle. Turn the ignition switch ON. Measure the voltage between terminal SPD of the A/C amplifier connector and body ground when the wheel is turned slowly. Standard: Voltage is generated intermittently is as shown below. NG: Go to step 2 OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-280565-S33963517772008022200000)
2. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - A/C AMPLIFIER) Check for open and short circuit in the harness and the connector between the combination meter assembly and the A/C amplifier (See «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-280562-S30988147692008022200000) ). NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE COMBINATION METER ASSEMBLY

The blower motor is operated by signals from the A/C amplifier. Blower motor speed signals are transmitted by changes in the Duty Ratio.

Scheme 53

The A/C amplifier outputs the magnetic clutch ON signal from AC1 terminal to the ECM. When the ECM receives this signal, it sends a signal from ACT terminal and the A/C amplifier switches the A/C magnetic clutch relay ON. This turns the A/C magnetic clutch on.

Scheme 54

Scheme 55

Scheme 56

Scheme 57

1. READ VALUE OF INTELLIGENT TESTER Connect the intelligent tester to the DLC3. Turn the ignition switch ON and push the intelligent tester main switch on. Check the A/C magnetic clutch input signal using DATA LIST. ENGINE: DATA LIST - ENGINE Item Measurement Item/Display (Range) Normal Condition Diagnostic Note A/C SIG A/C signal / ON or OFF A/C switch pushed: ON A/C switch released: OFF - NG: Go to step 8 OK: GO TO NEXT STEP
2. READ VALUE OF INTELLIGENT TESTER Connect the intelligent tester to the DLC3. Turn the ignition switch ON and push the intelligent tester main switch on. Check the A/C magnetic clutch operation permission signal using DATA LIST. ENGINE: DATA LIST - ENGINE Item Measurement Item/Display (Range) Normal Condition Diagnostic Note A/C MAG CLUTCH A/C magnetic clutch / ON or OFF A/C switch ON: ON A/C switch OFF: OFF - NG: REPLACE ECM OK: GO TO NEXT STEP
3. PERFORM ACTIVE TEST BY INTELLIGENT TESTER Connect the intelligent tester to the DLC3. Turn the ignition switch ON and push the intelligent tester main switch on. Check the A/C magnetic clutch operation using ACTIVE TEST. AIR CONDITIONER: ACTIVE TEST - AIR CONDITIONER Item Test Details/Display (Range) Diagnostic Note A/C MAG CLUTCH magnetic clutch relay / OFF, ON Operating sound can be heard NG: Go to step 5 OK: GO TO NEXT STEP
4. CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER (ACT TERMINAL) - ECM (ACT TERMINAL)) Check for open and short circuit in the harness and the connector between the A/C amplifier and the ECM (See «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-280562-S30988147692008022200000) ). NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-280565-S33963517772008022200000)
5. INSPECT COOLER RELAY ASSEMBLY (MG CLT RELAY) Remove the cooler relay assembly (MG CLT relay) from the engine room J/B. Measure the resistance according to the value(s) in «COOLER RELAY ASSEMBLY (MG CLT RELAY)»(ref-280565-S30526732862008022200000). Standard resistance COOLER RELAY ASSEMBLY (MG CLT RELAY) Tester Connection Condition Specified Condition 3-5 Always 10 kohms or higher 3-5 Battery voltage is applied between terminals 1 and 2 Below 1 ohms NG: REPLACE COOLER RELAY ASSEMBLY (MG CLT RELAY) OK: GO TO NEXT STEP
6. INSPECT MAGNETIC CLUTCH ASSEMBLY Disconnect the connector from the cooler compressor assembly. Connect the battery positive (+) lead to terminal 3, check that the following occurs: 1) the magnetic clutch's operating sound can be heard, and 2) the magnetic clutch's hub and rotor lock. NG: REPLACE MAGNETIC CLUTCH ASSEMBLY OK: GO TO NEXT STEP
7. CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER (MGC TERMINAL) - BODY GROUND) Check for open and short circuit in the harness and the connector between the A/C amplifier and body ground (See «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-280562-S30988147692008022200000) ). NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE AIR CONDITIONING AMPLIFIER
8. CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER (AC1 TERMINAL) - ECM (AC1 TERMINAL)) Check for open and short circuit in the harness and the connector between the A/C amplifier and the ECM (See «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-280562-S30988147692008022200000) ). NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: GO TO NEXT STEP
9. INSPECT AIR CONDITIONING AMPLIFIER (AC1) Remove the A/C amplifier with the connectors still connected. Start the engine and push AUTO switch. Measure the voltage according to the value(s) in «AIR CONDITIONING AMPLIFIER (AC1)»(ref-280565-S10150774362008022200000). Standard voltage AIR CONDITIONING AMPLIFIER (AC1) Tester Connection (Symbols) Condition Specified Condition A17-7 (AC1) - Body ground A/C switch: OFF 3.7 to 4.5 V A17-7 (AC1) - Body ground A/C switch: ON 1.3 to 2.6 V NG: REPLACE AIR CONDITIONING AMPLIFIER OK: REPLACE ECM

This circuit is a power supply for the air conditioning control assembly (heater control panel).

Scheme 58

Scheme 59

Scheme 60

1. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - BATTERY) Disconnect the connector from the air conditioning control panel assembly. Measure the voltage according to the value(s) in «AIR CONDITIONING AMPLIFIER - BATTERY»(ref-280565-S07883327752008022200000). Standard voltage AIR CONDITIONING AMPLIFIER - BATTERY Tester Connection (Symbols) Condition Specified Condition D3-1 (B) - Body ground Always 10 to 14 V D3-2 (IG+). Body ground Ignition switch ON 10 to 14 V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: GO TO NEXT STEP
2. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - BODY GROUND) Disconnect the connector from the air conditioning control panel assembly. Measure the resistance according to the value(s) in «AIR CONDITIONING AMPLIFIER - BODY GROUND»(ref-280565-S41173198312008022200000). Standard resistance AIR CONDITIONING AMPLIFIER - BODY GROUND Tester Connection (Symbols) Condition Specified Condition D3-7 (GND) - Body ground Always Below 1 ohms NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-280565-S33963517772008022200000)

The heater relay is switched on by signals from the A/C amplifier. It supplies power to the blower motor.

Scheme 61

Scheme 62

Scheme 63

Scheme 64

1. CHECK FUSE (HTR) Remove the HTR fuse from the engine room R/B. Measure the resistance according to the value(s) in «FUSE (HTR)»(ref-280565-S01101415522008022200000). Standard resistance FUSE (HTR) Tester Item Condition Specified Condition HTR fuse Always Below 1 ohms NG: REPLACE FUSE (HTR) OK: GO TO NEXT STEP
2. INSPECT HEATER BLOWER MOTOR RELAY Remove the heater blower motor relay from the engine room R/B. Measure the resistance according to the value(s) in «HEATER BLOWER MOTOR RELAY»(ref-280565-S12473067882008022200000). Standard resistance HEATER BLOWER MOTOR RELAY Tester Connection Condition Specified Condition 3-5 Always 10 kohms or higher 3-5 When battery voltage applied to terminals 1 and 2 Below 1 ohms 3-4 Always Below 1 ohms 3-4 When battery voltage applied to terminals 1 and 2 10 kohms or higher NG: REPLACE HEATER BLOWER MOTOR RELAY OK: GO TO NEXT STEP
3. CHECK HARNESS AND CONNECTOR (HEATER BLOWER MOTOR RELAY - BATTERY) Remove the heater blower motor relay assembly from the engine room R/B. Measure the voltage according to the value(s) in «HEATER BLOWER MOTOR RELAY - BATTERY»(ref-280565-S24710274842008022200000). Standard voltage HEATER BLOWER MOTOR RELAY - BATTERY Tester Connection Condition Specified Condition 1-Body ground Ignition switch ON 10 to 14 V 5 - Body ground Always 10 to 14 V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: GO TO NEXT STEP
4. CHECK HARNESS AND CONNECTOR (HEATER BLOWER MOTOR RELAY - BODY GROUND) Measure the resistance according to the value(s) in «HEATER BLOWER MOTOR RELAY - BODY GROUND»(ref-280565-S20166386762008022200000). Standard resistance HEATER BLOWER MOTOR RELAY - BODY GROUND Tester Connection Condition Specified Condition 4-Body ground Always Below 1 ohms NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: GO TO NEXT STEP
5. CHECK HARNESS AND CONNECTOR (HEATER BLOWER MOTOR RELAY - AIR CONDITIONING AMPLIFIER) Check for open and short circuit in the harness and the connector between the heater blower motor relay and the A/C amplifier (See «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-280562-S30988147692008022200000) ). NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-280565-S33963517772008022200000)

The main power source is supplied to the A/C amplifier when the ignition switch ON.

The power source is used for operating the A/C amplifier and servo motor, etc.

Scheme 65

Scheme 66

Scheme 67

Scheme 68

Scheme 69

1. INSPECT FUSE (IG1) Remove the IG1 fuse from the driver side J/B. Measure the resistance according to the value(s) in «FUSE (IG1)»(ref-280565-S40089561762008022200000). Standard resistance FUSE (IG1) Tester Item Condition Specified Condition IG1 fuse Always Below 1 ohms NG: REPLACE FUSE (IG1) OK: GO TO NEXT STEP
2. INSPECT AIR CONDITIONING AMPLIFIER (IG+ - GND) Remove the A/C amplifier with the connectors still connected. Turn the ignition switch ON. Measure the voltage according to the value(s) in «AIR CONDITIONING AMPLIFIER (IG+ - GND)»(ref-280565-S34788764132008022200000). Standard voltage AIR CONDITIONING AMPLIFIER (IG+ - GND) Tester Connection (Symbols) Condition Specified Condition A16-1 (IG) - A16-5 (GND) Ignition switch ON 10 to 14 V NG: Go to step 3 OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-280565-S33963517772008022200000)
3. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - BATTERY) Disconnect the connector from the A/C amplifier. Measure the voltage according to the value(s) in «AIR CONDITIONING AMPLIFIER - BATTERY»(ref-280565-S20023484982008022200000). Standard voltage AIR CONDITIONING AMPLIFIER - BATTERY Tester Connection (Symbols) Condition Specified Condition A16-1 (IG) - Body ground Ignition switch OFF Below 1 V A16-1 (IG) - Body ground Ignition switch ON 10 to 14 V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: GO TO NEXT STEP
4. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - BODY GROUND) Measure the resistance according to the value(s) in «AIR CONDITIONING AMPLIFIER - BODY GROUND»(ref-280565-S26423951312008022200000). Standard resistance AIR CONDITIONING AMPLIFIER - BODY GROUND Tester Connection Condition Specified Condition A16-5 (GND) - Body ground Always Below 1 ohms NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE AIR CONDITIONING AMPLIFIER

The back-up power source circuit for the A/C amplifier is shown below. Power is supplied even when turning the engine switch off and is used for diagnostic trouble code memory, etc.

Scheme 70

Scheme 71

Scheme 72

1. INSPECT FUSE (ECU-B) Remove the ECU-B fuse from the engine room R/B. Measure the resistance according to the value(s) in «FUSE (ECU-B)»(ref-280565-S33476920892008022200000). Standard resistance FUSE (ECU-B) Tester Item Condition Specified Condition ECU-B fuse Always Below 1 ohms NG: REPLACE FUSE (ECU-B) OK: GO TO NEXT STEP
2. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - BATTERY) Disconnect the connector from the A/C amplifier. Measure the voltage according to the value(s) in «AIR CONDITIONING AMPLIFIER - BATTERY»(ref-280565-S07086323282008022200000). Standard voltage AIR CONDITIONING AMPLIFIER - BATTERY Tester Connection (Symbols) Condition Specified Condition A16-2 (+B) - Body ground Always 10 to 14 V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-280565-S33963517772008022200000)

This circuit is a communication line between the air conditioning control assembly (heater control panel) and the A/C amplifier.

Scheme 73

See also:
• ENGINE CONTROL SYSTEM (1GR-FE)
• ENGINE CONTROL SYSTEM (2UZ-FE)
• REMOVAL