Air Conditioning: Overview Toyota Sienna II рестайлинг

DESCRIPTION

This sensor detects the cabin temperature that is used as the basis for temperature control and sends a signal to the A/C amplifier.

DTC DETECTION CONDITION AND TROUBLE AREA

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1. READ VALUE OF INTELLIGENT TESTER Connect the intelligent tester to the DLC3. Turn the ignition switch to the ON position and turn the intelligent tester main switch on. Select the item below in the DATA LIST, and read the display on the intelligent tester. DATA LIST / AIR CONDITIONER: TESTER DISPLAY AND DATA LIST Tester Display Measurement Item/Range Normal Condition ROOM TEMP (Room temperature sensor) Room temperature sensor / min.: -6.5°C (20.3°F), max.: 57.25°C (135.05°F) Actual cabin temperature is displayed OK: The display is as specified in the normal condition column. Result RESULT REFERENCE Result Proceed to NG A OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE) B OK (When troubleshooting according to the DTC) C B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE C: REPLACE A/C AMPLIFIER A: Go to Next Step
2. INSPECT A/C ROOM TEMPERATURE SENSOR Remove the A/C room temperature sensor. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition A13-1-A13-2 10°C (50°F) 3.00 to 3.73 kohms A13-1-A13-2 15°C (59°F) 2.45 to 2.88 kohms A13-1-A13-2 20°C (68°F) 1.95 to 2.30 kohms A13-1-A13-2 25°C (77°F) 1.60 to 1.80 kohms A13-1-A13-2 30°C (86°F) 1.28 to 1.47 kohms A13-1 -A13-2 35°C (95°F) 1.00 to 1.22 kohms A13-1-A13-2 40°C (104°F) 0.80 to 1.00 kohms A13-1-A13-2 45°C (113°F) 0.65 to 0.85 kohms A13-1-A13-2 50°C (122°F) 0.50 to 0.70 kohms A13-1-A13-2 55°C (131°F) 0.44 to 0.60 kohms A13-1-A13-2 60°C (140°F) 0.36 to 0.50 kohms NOTE: Hold the sensor only by its connector. Touching the sensor may change the resistance value. When measuring, the sensor temperature must be the same as the room temperature. HINT: As the temperature increases, the resistance decreases (Scheme 3) NG: REPLACE A/C ROOM TEMPERATURE SENSOR OK: Go to Next Step
3. CHECK HARNESS AND CONNECTOR (A/C ROOM TEMPERATURE SENSOR - A/C AMPLIFIER) Disconnect the connector from the A/C amplifier. Disconnect the connector from the A/C room temperature sensor. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition A9-33(TR) - A13-1 Always Below 1 ohms A9-23 (SG-5) - A13-2 Always Below 1 ohms A9-33 (TR) - Body ground Always 10 kohms or higher A9-23 (SG-5) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE A/C AMPLIFIER

The ambient temperature sensor is installed in front of the condenser to detect the ambient temperature which is used to control the air conditioner "AUTO" mode. This sensor is connected to the A/C amplifier and detects fluctuations in the ambient temperature. This data is used for controlling the cabin temperature. The sensor sends a signal to the A/C amplifier. The resistance of the ambient temperature sensor changes in accordance with the ambient temperature. As the temperature decreases, the resistance increases. As the temperature increases, the resistance decreases.

The A/C amplifier applies voltage (5 V) to the ambient temperature sensor and reads voltage changes as the resistance of the ambient temperature sensor changes.

DTC DETECTION CONDITION AND TROUBLE AREA

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1. READ VALUE OF INTELLIGENT TESTER Connect the intelligent tester to the DLC3. Turn the ignition switch to the ON position and turn the intelligent tester main switch on. Select the item below in the DATA LIST, and read the display on the intelligent tester. DATA LIST / AIR CONDITIONER: TESTER DISPLAY AND DATA LIST Tester Display Measurement Item/Range Normal Condition AMBI TEMP SENS (Ambient temperature sensor) Ambient temperature sensor / min: -30.8°C (-23.44°F), max: 50.8°C (123.44°F) Actual ambient temperature is displayed- OK: The display is as specified in the normal condition column. Result RESULT REFERENCE Result Proceed to NG A OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE) B OK (When troubleshooting according to the DTC) C B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE C: REPLACE A/C AMPLIFIER A: Go to Next Step
2. INSPECT AMBIENT TEMPERATURE SENSOR Remove the ambient temperature sensor. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION 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 must be the same as the ambient temperature. HINT: As the temperature increases, the resistance decreases (Scheme 7) NG: REPLACE AMBIENT TEMPERATURE SENSOR OK: Go to Next Step
3. CHECK HARNESS AND CONNECTOR (AMBIENT TEMPERATURE SENSOR - A/C AMPLIFIER) Disconnect the ambient temperature sensor connector. Disconnect the A/C amplifier connector. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition A1-2 - A9-32(TAM) Always Below 1 ohms A1-1 - A9-24(SG-6) Always Below 1 ohms A9-32 (TAM) - Body ground Always 10 kohms or higher A9-24 (SG-6) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE A/C AMPLIFIER

The evaporator temperature sensor (A/C thermistor) is installed on the evaporator in the air conditioning unit. It detects the temperature of the cooled air that has passed through the evaporator and its signal is used to control the air conditioning. It sends a signal to the A/C amplifier. The resistance of the evaporator temperature sensor (A/C thermistor) changes in accordance with the temperature of the cooled air that has passed through the evaporator. As the temperature decreases, the resistance increases. As the temperature increases, the resistance decreases.

The A/C amplifier applies voltage (5 V) to the evaporator temperature sensor (A/C thermistor) and reads voltage changes as the resistance of the evaporator temperature sensor (A/C thermistor) changes. This sensor is used to prevent the evaporator from freezing.

DTC DETECTION CONDITION AND TROUBLE AREA

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1. READ VALUE OF INTELLIGENT TESTER Connect the intelligent tester to the DLC3. Turn the ignition switch to the ON position and turn the intelligent tester main switch on. Select the item below in the DATA LIST, and read the display on the intelligent tester. DATA LIST / AIR CONDITIONER: TESTER DISPLAY AND DATA LIST Tester Display Measurement Item/Range Normal Condition EVAP TEMP (Evaporator thermistor) Evaporator thermistor / min.: -29.7°C (-21.46°F), max.: 59.55°C (139.19°F) Actual evaporator temperature is displayed OK: The display is as specified in the normal condition column. Result RESULT REFERENCE Result Proceed to NG A OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE) B OK (When troubleshooting according to the DTC) C B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE C: REPLACE A/C AMPLIFIER A: Go to Next Step
2. INSPECT EVAPORATOR TEMPERATURE SENSOR Disconnect the connector from the evaporator temperature sensor. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition A12-1 - A12-2 -10°C (14°F) 7.30 to 9.10 kohms A12-1 - A12-2 -5°C (23°F) 5.65 to 6.95 kohms A12-1 - A12-2 0°C (32°F) 4.40 to 5.35 kohms A12-1 - A12-2 5°C (41°F) 3.40 to 4.15 kohms A12-1 - A12-2 10°C (50°F) 2.70 to 3.25 kohms A12-1 - A12-2 15°C (59°F) 2.14 to 2.58 kohms A12-1 - A12-2 20°C (68°F) 1.71 to 2.05 kohms A12-1 - A12-2 25°C (77°F) 1.38 to 1.64 kohms A12-1 - A12-2 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 must be the same as the evaporator temperature. HINT: As the temperature increases, the resistance decreases (Scheme 11) NG: REPLACE EVAPORATOR TEMPERATURE SENSOR OK: Go to Next Step
3. CHECK HARNESS AND CONNECTOR (EVAPORATOR TEMPERATURE SENSOR - A/C AMPLIFIER) Disconnect the evaporator temperature sensor connector. Disconnect the A/C amplifier connector. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition A9-34(TE) - A12-2 Always Below 1 ohms A9-22 (SG-4) - A12-1 Always Below 1 ohms A9-34 (TE) - Body ground Always 10 kohms or higher A9-22 (SG-4) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE A/C AMPLIFIER

The rear evaporator temperature sensor is installed on the rear evaporator. It detects the rear evaporator temperature. The sensor sends a signal to the A/C amplifier. The resistance of the rear evaporator temperature sensor changes in accordance with the rear evaporator temperature. As the temperature decreases, the resistance increases. As the temperature increases, the resistance decreases. The A/C amplifier applies voltage (5 V) to the rear evaporator temperature sensor and reads voltage changes as the resistance of the rear evaporator temperature sensor changes.

DTC DETECTION CONDITION AND TROUBLE AREA

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1. READ VALUE OF INTELLIGENT TESTER Connect the intelligent tester to the DLC3. Turn the ignition switch to the ON position and turn the intelligent tester main switch on. Select the item below in the DATA LIST, and read the display on the intelligent tester. DATA LIST / AIR CONDITIONER: TESTER DISPLAY AND DATA LIST Tester Display Measurement Item/Range Normal Condition R-EVAP TEMP SEN (Rear evaporator temperature sensor) Rear evaporator temperature sensor / min: -29.7°C (-21.46°F), max: 59.55°C (139.19°F) Actual rear evaporator temperature is displayed- OK: The display is as specified in the normal condition column. Result RESULT REFERENCE Result Proceed to NG A OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE) B OK (When troubleshooting according to the DTC) C B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE C: REPLACE A/C AMPLIFIER A: Go to Next Step
2. INSPECT REAR EVAPORATOR TEMPERATURE SENSOR Remove the rear evaporator temperature sensor. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition A26-1 - A26-2 -10°C (14°F) 7.40 to 9.20 kohms A26-1 - A26-2 -5°C (23°F) 5.65 to 7.00 kohms A26-1 - A26-2 0°C (32°F) 4.35 to 5.40 kohms A26-1 - A26-2 5°C (41°F) 3.40 to 4.20 kohms A26-1 - A26-2 10°C (50°F) 2.68 to 3.30 kohms A26-1 - A26-2 15°C (59°F) 2.10 to 2.60 kohms A26-1 - A26-2 20°C (68°F) 1.66 to 2.10 kohms A26-1 - A26-2 25°C (77°F) 1.32 to 1.66 kohms A26-1 - A26-2 30°C (86°F) 1.05 to 1.35 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 must be the same as the rear evaporator temperature. HINT: As the temperature increases, the resistance decreases (Scheme 16) NG: REPLACE REAR EVAPORATOR TEMPERATURE SENSOR OK: Go to Next Step
3. CHECK HARNESS AND CONNECTOR (REAR EVAPORATOR TEMPERATURE SENSOR A/C AMPLIFIER) Disconnect the rear evaporator temperature sensor connector. Disconnect the A/C amplifier connector. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition A26-2 - A10-17(TEC) Always Below 1 ohms A26-1 - A10-13(SG) Always Below 1 ohms A10-17 (TEC) - Body ground Always 10 kohms or higher A10-13 (SG) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE A/C AMPLIFIER

This sensor detects the rear cabin temperature that is used as the basis for temperature control and sends a signal to the A/C amplifier.

DTC DETECTION CONDITION AND TROUBLE AREA

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1. READ VALUE OF INTELLIGENT TESTER Connect the intelligent tester to the DLC3. Turn the ignition switch to the ON position and turn the intelligent tester main switch on. Select the item below in the DATA LIST, and read the display on the intelligent tester. DATA LIST / AIR CONDITIONER: TESTER DISPLAY AND DATA LIST Tester Display Measurement Item/Range Normal Condition REAR ROOM TEMP (Rear room temperature sensor) Rear room temperature sensor / min.: -6.5°C (20.3°F), max.: 57.25°C (135.05°F) Actual cabin temperature is displayed OK: The display is as specified in the normal condition column. Result RESULT REFERENCE Result Proceed to NG A OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE) B OK (When troubleshooting according to the DTC) C B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE C: REPLACE A/C AMPLIFIER A: Go to Next Step
2. INSPECT REAR A/C ROOM TEMPERATURE SENSOR Remove the rear A/C room temperature sensor. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition R23-1 - R23-2 10°C (50°F) 3.00 to 3.73 kohms R23-1 - R23-2 15°C (59°F) 2.45 to 2.88 kohms R23-1 - R23-2 20°C (68°F) 1.95 to 2.30 kohms R23-1 - R23-2 25°C (77°F) 1.60 to 1.80 kohms R23-1 - R23-2 30°C (86°F) 1.28 to 1.47 kohms R23-1 - R23-2 35°C (95°F) 1.00 to 1.22 kohms R23-1 - R23-2 40°C (104°F) 0.80 to 1.00 kohms R23-1 - R23-2 45°C (113°F) 0.65 to 0.85 kohms R23-1 - R23-2 50°C (122°F) 0.50 to 0.70 kohms R23-1 - R23-2 55°C (131°F) 0.44 to 0.60 kohms R23-1 - R23-2 60°C (140°F) 0.36 to 0.50 kohms NOTE: Hold the sensor only by its connector. Touching the sensor may change the resistance value. When measuring, the sensor temperature must be the same as the rear cabin temperature. HINT: As the temperature increases, the resistance decreases (Scheme 20) NG: REPLACE REAR A/C ROOM TEMPERATURE SENSOR OK: Go to Next Step
3. CHECK HARNESS AND CONNECTOR (REAR A/C ROOM TEMPERATURE SENSOR - A/C AMPLIFIER) Disconnect the connector from the A/C amplifier. Disconnect the connector from the rear A/C room temperature sensor. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition A10-18(TR) - R23-1 Always Below 1 ohms A10-14(SGND) - R23-2 Always Below 1 ohms A10-18 (TR) - Body ground Always 10 kohms or higher A10-14 (SGND) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE A/C AMPLIFIER

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The solar sensor, which is installed on the upper side of the instrument panel, detects sunlight and controls the air conditioning in AUTO mode. The output voltage from the solar sensor varies according to the amount of sunlight. When the sunlight increases, the output voltage increases. As the sunlight decreases, the output voltage decreases. The A/C amplifier detects voltage output from the solar sensor.

DTC DETECTION CONDITION AND TROUBLE AREA

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SYSTEM DESCRIPTION

The ECM sends an engine speed signal to the A/C amplifier via CAN communication and BEAN communication.

The A/C amplifier reads the difference between compressor speed and engine speed. When the difference becomes too large, the A/C amplifier determines that the compressor locks, and turns the magnetic clutch off.

DTC DETECTION CONDITION AND TROUBLE AREA

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1. CHECK CAN COMMUNICATION SYSTEM Use the intelligent tester to check if the CAN communication system is functioning normally. Result RESULT REFERENCE Result Proceed to CAN DTC is not output A CAN DTC is output B B: GO TO «CAN COMMUNICATION SYSTEM»(ref-282149-S22258365312008032900000) A: Go to Next Step
2. CHECK MULTIPLEX COMMUNICATION SYSTEM Use the intelligent tester to check If the multiplex communication system (BEAN) is functioning normally. Result RESULT REFERENCE Result Proceed to BEAN DTC is not output A BEAN DTC is output B B: GO TO «MULTIPLEX COMMUNICATION SYSTEM»(ref-282150-S23766576272008032900000) A: Go to Next Step
3. INSPECT A/C AMPLIFIER Remove the A/C amplifier with the connectors still connected. Measure the waveform of the connector. ITEM CONDITION CHART Item Contents Tool setting 200 mV/DIV., 10 ms./DIV. Vehicle condition Engine is running A/C switch: ON Blower switch: LO Standard TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition A9-9 (LOCK) - A9-24 (SG-6) Engine is running A/C switch: ON Blower switch: LO Pulse generation Result RESULT REFERENCE Result Proceed to NG A OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE) B OK (When troubleshooting according to the DTC) C B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE C: REPLACE A/C AMPLIFIER A: Go to Next Step
4. INSPECT COMPRESSOR AND MAGNETIC CLUTCH (A/C LOCK SENSOR) Disconnect the connector from the A/C compressor. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition A31-1(SSR+) - A31-2 (SSR-) Always (at 20°C (68°F)) 165 to 205 ohms NG: REPLACE COMPRESSOR AND MAGNETIC CLUTCH (A/C LOCK SENSOR) OK: Go to Next Step
5. CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - A/C LOCK SENSOR) Disconnect the connector from the A/C amplifier. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition A9-9 (LOCK) - A31-1 (SSR+) Always Below 1 ohms A9-24 (SG-6) - A31-2 (SSR-) Always Below 1 ohms A9-9 (LOCK) - Body ground Always 10 kohms or higher A9-24 (SG-6) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE A/C AMPLIFIER

This DTC is output when refrigerant pressure on the high pressure side is extremely low (0.19 MPa (2.0 kgf/cm 2 , 28 psi) or less) or extremely high (3.14 MPa (32.0 kgf/cm 2 , 455 psi) or more). The pressure sensor, which is installed on the pipe of the high pressure side to detect refrigerant pressure, outputs a refrigerant pressure signal to the A/C amplifier. The A/C amplifier converts this signal to pressure according to the sensor characteristics to control the compressor.

DTC DETECTION CONDITION AND TROUBLE AREA

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1. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) Disconnect the connector from the A/C pressure sensor. Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition A33-3 (+) - Body ground Ignition switch ON Approx. 5 V NG: Go to step 5 OK: Go to Next Step
2. CHECK HARNESS AND CONNECTOR (GROUND CIRCUIT) Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition A33-1 (-) - Body ground Always Below 1 ohms NG: Go to step 6 OK: Go to Next Step
3. INSPECT A/C PRESSURE SENSOR (SENSOR SIGNAL CIRCUIT) Reconnect the connector to the A/C pressure sensor. Remove the A/C amplifier with connectors still connected. Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition A9-35 (PRE) - Body ground Ignition switch ON (A/C: OFF) 0.7 to 4.8 V HINT: If the measured voltage is not within the normal range, there may be a malfunction in the A/C amplifier, A/C pressure sensor, or wire harness. It is also possible that the amount of refrigerant may not be appropriate. NG: Go to step 7 OK: Go to Next Step
4. INSPECT A/C PRESSURE SENSOR (SENSOR SIGNAL CIRCUIT) Measure the voltage when the following conditions are satisfied. ITEM CONDITION CHART Item Condition Vehicle Doors Fully open Temperature Setting MAX COLD Blower Speed HI A/C Switch ON R/F Switch RECIRCULATION Interior Temperature 25 to 35°C (77 to 95°F) Engine Speed 2000 rpm NOTE: If refrigerant pressure on the high pressure side becomes extremely high during the inspection (if the voltage exceeds 4.8 V), the fail-safe function stops compressor operation. Therefore, measure the voltage before the fail-safe operation. It is necessary to measure the voltage for a certain amount of time (approximately 10 minutes) because the problem symptom may recur after a while. HINT: When the outside air temperature is low (below -1.5°C (29.3°F)), the compressor stops due to operation of the ambient temperature sensor and the evaporator temperature sensor to prevent the evaporator from freezing. In this case, perform the inspection in a warm indoor environment. Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition A9-35 (PRE) - Body ground Ignition switch ON (A/C: ON) 0.7 to 4.8 V Result RESULT REFERENCE Result Proceed to OK (When troubleshooting according to DTC) A OK (When troubleshooting-according to PROBLEM SYMPTOMS TABLE) B NG C B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE C: Go to step 13 A: REPLACE A/C AMPLIFIER
5. CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - A/C PRESSURE SENSOR) Disconnect the connector from the A/C amplifier. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition A33-3(+) - A9-10(S5-5) Always Below 1 ohms A9-10(S5-5) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE A/C AMPLIFIER
6. CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - A/C PRESSURE SENSOR) Disconnect the connector from the A/C amplifier. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition A33-1 (-) - A9-24 (SG-6) Always Below 1 ohms A9-24 (SG-6) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE A/C AMPLIFIER
7. CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - A/C PRESSURE SENSOR) Disconnect the connector from the A/C amplifier. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition A33-2 (PR) - A9-35 (PRE) Always Below 1 ohms A9-35 (PRE) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to Next Step
8. CHECK FOR A/C SYSTEM LEAK Install the manifold gauge set. Recover the refrigerant from the A/C system using a refrigerant recovery unit. Evacuate the A/C system and check that vacuum can be maintained in it. OK: Vacuum can be maintained in the A/C system. HINT: If vacuum cannot be maintained in the A/C system, refrigerant may be leaking from it. In this case, it is necessary to repair or replace the leaking part of the A/C system. NG: Go to step 12 OK: Go to Next Step
9. CHARGE REFRIGERANT Add an appropriate amount of refrigerant (See «REFRIGERANT LINE»(ref-282137-S39626427062008032900000) ).
10. RECHECK DTC Recheck for the DTC when the following conditions are satisfied. ITEM CONDITION CHART Item Condition Vehicle Doors Fully open Temperature Setting MAX COLD Blower Speed HI A/C Switch ON R/F Switch RECIRCULATION Interior Temperature 25 to 35°C (77 to 95°F) Engine Speed 2000 rpm NOTE: If refrigerant pressure on the high pressure side becomes high, the DTC will be set. It is necessary to measure the voltage for a certain amount of time (approximately 10 minutes) because the DTC may be set after the A/C operates for a while. HINT: When the outside air temperature is low (below -1.5°C (29.3°F)), the compressor stops due to operation of the ambient temperature sensor and the evaporator temperature sensor to prevent the evaporator from freezing. In this case, perform the inspection in a warm indoor environment. Result RESULT REFERENCE Result Proceed to DTC B1423 is output A DTC B1423 is not output B NOTE: If the DTC was set due to an insufficient or excessive amount of refrigerant, the problem may have been solved after performing the previous step. However, the root cause of insufficient refrigerant may be refrigerant leaks. The root cause of excessive refrigerant may be adding refrigerant when the level was insufficient. Therefore, identify and repair the area where refrigerant leaks from as necessary. B: END A: Go to Next Step
11. INSPECT A/C PRESSURE SENSOR Install the manifold gauge set. Disconnect the connector from the A/C pressure sensor. Connect the three 1.5 V dry cell batteries' positive (+) lead to terminal 3, and the negative (-) lead to terminal 1. Connect the voltmeter's positive (+) lead to terminal 2, and the negative (-) lead to terminal 1. Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition 2-1 Refrigerant pressure: 0.39 to 3.187 MPa (57 to 463 psi) 1.0 to 4.8 V NG: REPLACE A/C PRESSURE SENSOR OK: REPLACE A/C AMPLIFIER
12. REPAIR A/C SYSTEM LEAK Identify the area where refrigerant leaks from (See «REFRIGERANT LINE»(ref-282137-S39626427062008032900000) ). Repair the identified area of the A/C system. Evacuate the A/C system. NEXT: CHARGE REFRIGERANT (See «REFRIGERANT LINE»(ref-282137-S39626427062008032900000) )
13. INSPECT COOLING FAN SYSTEM Check if the cooling fan operates normally (See «ON-VEHICLE INSPECTION»(/toyota/sienna/ii-2005-2010/remont/cooling-system-mechanical/#engine-cooling-system) ). NG: REPAIR COOLING FAN SYSTEM OK: Go to Next Step
14. CHARGE REFRIGERANT Use a refrigerant recovery unit to recover refrigerant. Evacuate the A/C system. Add an appropriate amount of refrigerant (See «REFRIGERANT LINE»(ref-282137-S39626427062008032900000) ). HINT: If refrigerant is added and the system has not been properly evacuated (insufficient vacuum time), moisture in the air remaining in the system will freeze in the expansion valve, blocking the flow on the high pressure side. Therefore, in order to confirm the problem, recover the refrigerant and properly evacuate the system. Add an appropriate amount of refrigerant, and check for the DTC.
15. RECHECK DTC Recheck for the DTC when the following conditions are satisfied. ITEM CONDITION CHART Item Condition Vehicle Doors Fully open Temperature Setting MAX COLD Blower Speed HI A/C Switch ON R/F Switch RECIRCULATION Interior Temperature 25 to 35°C (77 to 95°F) Engine Speed 2000 rpm NOTE: If refrigerant pressure on the high pressure side becomes high, the DTC will be set. It is necessary to measure the voltage for a certain amount of time (approximately 10 minutes) because the DTC may be set after the A/C operates for a while. HINT: When the outside air temperature is low (below -1.5°C (29.3°F)), the compressor stops due to operation of the ambient temperature sensor and the evaporator temperature sensor to prevent the evaporator from freezing. In this case, perform the inspection in a warm indoor environment. If refrigerant is added and the system has not been properly evacuated (insufficient vacuum time), moisture in the air remaining in the system will freeze in the expansion valve, blocking the flow on the high pressure side. Therefore, in order to confirm the problem, recover the refrigerant and properly evacuate the system. Add an appropriate amount of refrigerant, and check for the DTC. If the DTC is not output after this work, it indicates that the cooler dryer in the condenser is not able to absorb moisture in the refrigerant cycle. In this case, it is necessary to replace the cooler dryer in order to complete the repair. Result RESULT REFERENCE Result Proceed to DTC B1423 is output A DTC B1423 is not output B B: REPLACE COOLER DRYER A: Go to Next Step
16. REPLACE EXPANSION VALVE Replace the expansion valve with a normal one (See «REMOVAL»(ref-282137-S03594643882008032900000) ). HINT: Replace the expansion valve with a normal one because the expansion valve is either stuck or clogged.
17. CHARGE REFRIGERANT Add an appropriate amount of refrigerant (See «REFRIGERANT LINE»(ref-282137-S39626427062008032900000) ).
18. RECHECK DTC Recheck for the DTC when the following conditions are satisfied. ITEM CONDITION CHART Item Condition Vehicle Doors Fully open Temperature Setting MAX COLD Blower Speed HI A/C Switch ON R/F Switch RECIRCULATION Interior Temperature 25 to 35°C (77 to 95°F) Engine Speed 2000 rpm NOTE: If refrigerant pressure on the high pressure side becomes high, the DTC will be set. It is necessary to measure the voltage for a certain amount of time (approximately 10 minutes) because the DTC may be set after the A/C operates for a while. HINT: When the outside air temperature is low (below -1.5°C (29.3°F)), the compressor stops due to operation of the ambient temperature sensor and the evaporator temperature sensor to prevent the evaporator from freezing. In this case, perform the inspection in a warm indoor environment. If refrigerant pressure is not normal after replacing the expansion valve with a normal one, the condenser or pipes may be clogged due to dirt, dust or other contaminant. In this case, clean or replace the condenser or pipes. Result RESULT REFERENCE Result Proceed to DTC B1423 is not output A DTC B1423 is output B B: REPLACE CONDENSER A: END

The solar sensor, which is installed on the upper side of the instrument panel, detects sunlight and controls the air conditioning in AUTO mode. The output voltage from the solar sensor varies according to the amount of sunlight. When the sunlight increases, the output voltage increases. As the sunlight decreases, the output voltage decreases. The A/C amplifier detects output voltage from the solar sensor.

DTC DETECTION CONDITION AND TROUBLE AREA

Scheme 39

This sensor detects the position of the air outlet control servo motor and sends the appropriate signals to the A/C amplifier. The position sensor is built in the air outlet control servo motor. The position sensor's resistance changes as the air outlet control servo motor arm moves.

It outputs voltage (5 V) that is input to terminal 2 and terminal 3 via the variable resistor, and then to the A/C amplifier. The A/C amplifier determines the arm position based on the input voltage from the position sensor.

DTC DETECTION CONDITION AND TROUBLE AREA

Scheme 40

Scheme 41

Scheme 42

Scheme 43

Scheme 44

1. READ VALUE OF INTELLIGENT TESTER Connect the intelligent tester to the DLC3. Turn the ignition switch to the ON position and turn the intelligent tester main switch on. Select the items below in the DATA LIST, and read the displays on the intelligent tester. DATA LIST / AIR CONDITIONER TESTER DISPLAY AND DATA LIST Tester Display Measurement Item/Range Normal Condition Diagnostic Note A/O DAMP POS Air outlet damper position / min.: -14%, max.: 113.5% Damper is at "FACE": 0% Damper is at "FACE/FOOT": 33.5% Damper is at "FOOT": 53.5% Damper is at "FACE/DEF": 73.5% Damper is at "DEF": 100% Open in the circuit: 50.0% A/O DAMP TARG Air outlet damper target position / min.: -14%, max.: 113.5% OK: The display is as specified in the normal condition column. Result RESULT REFERENCE Result Proceed to NG A OK (When troubleshooting according to the PROBLEM SYMPTOM TABLE) B OK (When troubleshooting according to the DTC) C B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE C: REPLACE A/C AMPLIFIER A: Go to Next Step
2. INSPECT AIR OUTLET CONTROL SERVO MOTOR Remove the air outlet control servo motor. Disconnect the connector from the air outlet control servo motor. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition A19-2-A19-1 Always 4.2 to 7.8 kohms Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition A19-3-A19-1 DEF position 0.8 to 1.6 kohms A19-3-A19-1 FACE position 3.4 to 6.2 kohms As the air outlet control servo motor moves from the FACE side to the DEF side, the resistance decreases gradually without interruption. NG: REPLACE AIR OUTLET CONTROL SERVO MOTOR OK: Go to Next Step
3. CHECK HARNESS AND CONNECTOR (AIR OUTLET CONTROL SERVO MOTOR - A/C AMPLIFIER) Disconnect the connector from the A/C amplifier. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition A9-29 (TPO) - A19-3 Always Below 1 ohms A9-21 (SG-1) - A19-1 Always Below 1 ohms A9-30 (S5-1) - A19-2 Always Below 1 ohms A9-29 (TPO) - Body ground Always 10 kohms or higher A9-21 (SG-1) - Body ground Always 10 kohms or higher A9-30 (S5-1) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE A/C AMPLIFIER

This sensor detects the position of the air mix control servo motor (air outlet damper) and sends the appropriate signals to the A/C amplifier. The position sensor is built in the air mix control servo motor. The position sensor resistance changes as the air mix control servo motor arm moves.

It outputs voltage (5 V) that is input to terminal 1 and terminal 3 via the variable resistor, and then to the A/C amplifier. The A/C amplifier determines the arm position based on the input voltage from the position sensor.

DTC DETECTION CONDITION AND TROUBLE AREA

Scheme 45

Scheme 46

Scheme 47

Scheme 48

1. READ VALUE OF INTELLIGENT TESTER Connect the intelligent tester to the DLC3. Turn the ignition switch to the ON position and turn the intelligent tester main switch on. Select the items below in the DATA LIST, and read the display on the intelligent tester. DATA LIST / AIR CONDITIONER TESTER DISPLAY AND DATA LIST Tester Display Measurement Item/Range Normal Condition A/M DAMP POS-D Air mix damper position (Driver side) / min.: -14%, max.: 113.5% Damper is at "MAX. COOL": -5% Damper is at "MAX. HOT": 105% A/M DAMP TARG-D Air mix damper target position (Driver side) / min.: -14%, max.: 113.5% OK: The display is as specified in the normal condition column. Result RESULT REFERENCE Result Proceed to NG A OK (When troubleshooting according to the PROBLEM SYMPTOM TABLE) B OK (When troubleshooting according to the DTC) C B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE C: REPLACE A/C AMPLIFIER A: Go to Next Step
2. INSPECT AIR MIX CONTROL SERVO MOTOR Remove the air mix control servo motor. Disconnect the connector from the air mix control servo motor. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition A17-1 - A17-2 Always 4.2 to 7.8 kohms Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition A17-3-A17-2 MAX. COOL position 3.4 to 6.2 kohms A17-3-A17-2 MAX. HOT position 0.8 to 1.6 kohms As the air mix control servo motor moves from the COOL side to the HOT side, the resistance decreases gradually without interruption. NG: REPLACE AIR MIX CONTROL SERVO MOTOR OK: Go to Next Step
3. CHECK HARNESS AND CONNECTOR (AIR MIX CONTROL SERVO MOTOR - A/C AMPLIFIER) Disconnect the connector from the A/C amplifier. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition A9-26 (TPD) - A17-3 Always Below 1 ohms A9-21 (SG-1) - A17-2 Always Below 1 ohms A9-30 (S5-1) - A17-1 Always Below 1 ohms A9-26 (TPD) - Body ground Always 10 kohms or higher A9-21 (SG-1) - Body ground Always 10 kohms or higher A9-30(S5-1) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE A/C AMPLIFIER

Scheme 49

This sensor detects the position of the rear air mix control servo motor (water valve servo motor) and sends the appropriate signals to the A/C amplifier. The position sensor is built in the rear air mix control servo motor (water valve servo motor).

The position sensor's resistance changes as the rear air mix control servo motor valve moves. It outputs voltage (5 V) that is input to terminal 2 and terminal 3 via the variable resistor, and then to the A/C amplifier.

The A/C amplifier determines the valve position based on the input voltage from the position sensor.

DTC DETECTION CONDITION AND TROUBLE AREA

Scheme 50

Scheme 51

Scheme 52

Scheme 53

Scheme 54

1. READ VALUE OF INTELLIGENT TESTER Connect the intelligent tester to the DLC3. Turn the ignition switch to the ON position and turn the intelligent tester main switch on. Select the items below in the DATA LIST, and read the display on the intelligent tester. DATA LIST / AIR CONDITIONER TESTER DISPLAY AND DATA LIST Tester Display Measurement Item/Range Normal Condition A/M DAMP POS-R Air mix damper position (Rear) / min.: -14%, max.: 113.5% Damper is at "MAX. COOL": 0% Damper is at "MAX. HOT": 86.5% A/M DAMP TARG-R Air mix damper target position (Rear)/min.: -14%, max.: 113.5% OK: The display is as specified in the normal condition column. Result RESULT REFERENCE Result Proceed to NG A OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE) B OK (When troubleshooting according to the DTC) C B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE C: REPLACE A/C AMPLIFIER A: Go to Next Step
2. INSPECT REAR AIR MIX CONTROL SERVO MOTOR (WATER VALVE SERVO MOTOR) Remove the rear air mix control servo motor (water valve servo motor). Disconnect the connector from the rear air mix control servo motor (water valve servo motor). Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition W2-1 - W2-2 Always 4.2 to 7.8 kohms Measure the resistance according to the value(s) in the table below. HINT: In order to turn the motor to the "MAX. COOL" position, connect the positive (+) lead to terminal 5, and the negative (-) lead to terminal 4. In order to turn the motor to the "MAX. HOT" position, connect the positive (+) lead to terminal 4, and the negative (-) lead to terminal 5. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition W2-3 - W2-1 MAX. COOL position 3.4 to 6.2 kohms W2-3 - W2-1 MAX. HOT position 1.2 to 2.2 kohms As the rear air mix control servo motor (water valve servo motor) moves from the cool side to the hot side, the resistance decreases gradually without interruption. NG: REPLACE REAR AIR MIX CONTROL SERVO MOTOR (WATER VALVE SERVO MOTOR) OK: Go to Next Step
3. CHECK HARNESS AND CONNECTOR (REAR AIR MIX CONTROL SERVO MOTOR - A/C AMPLIFIER) Disconnect the connector from the A/C amplifier. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition A10-21(TPH) - W2-3 Always Below 1 ohms A10-12(S5) - W2-2 Always Below 1 ohms A10-13(SG) - W2-1 Always Below 1 ohms A10-21(TPH) - Body ground Always 10 kohms or higher A10-12(S5) - Body ground Always 10 kohms or higher A10-13(SG) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE A/C AMPLIFIER

This sensor detects the position of the rear air outlet control servo motor and sends the appropriate signals to the A/C amplifier. The position sensor is built in the rear air outlet control servo motor. The position sensor's resistance changes as the rear air outlet control servo motor arm moves.

It outputs voltage (5 V) that is input to terminal 2 and terminal 3 via the variable resister, and then to the A/C amplifier.

The A/C amplifier determines the arm position based on the input voltage from the position sensor.

DTC DETECTION CONDITION AND TROUBLE AREA

Scheme 55

Scheme 56

Scheme 57

Scheme 58

Scheme 59

1. READ VALUE OF INTELLIGENT TESTER Connect the intelligent tester to the DLC3. Turn the ignition switch to the ON position and turn the intelligent tester main switch on. Select the items below in the DATA LIST, and read the display on the intelligent tester. DATA LIST / AIR CONDITIONER TESTER DISPLAY AND DATA LIST Tester Display Measurement Item/Range Normal Condition Diagnostic Note A/O DAMP POS-R Air outlet mode damper position (Rear)/min.: -14%, max.: 113.5% Damper is at "FACE1": 0% Damper is at "FACE2": 16.5% Damper is at "FACE/FOOT": 44% Damper is at "FOOT": 100% Open in the circuit: 50.0% A/O DAMP TARG-R Air outlet damper target position (Rear) / min.: -14%, max.: 113.5% OK: The display is as specified in the normal condition column. Result RESULT REFERENCE Result Proceed to NG A OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE) B OK (When troubleshooting according to the DTC) C B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE C: REPLACE A/C AMPLIFIER A: Go to next step
2. INSPECT REAR AIR OUTLET CONTROL SERVO MOTOR Remove the rear air outlet control servo motor. Disconnect the connector from the rear air outlet control servo motor. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition A30-1 - A30-2 Always 4.2 to 7.8 kohms Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition A30-3 - A30-1 FACE position 3.4 to 6.2 kohms A30-3 - A30-1 FOOT position 0.8 to 1.6 kohms As the rear air outlet control servo motor moves from FACE to FOOT, the resistance decreases gradually without interruption. NG: REPLACE REAR AIR OUTLET CONTROL SERVO MOTOR OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (REAR AIR OUTLET CONTROL SERVO MOTOR A/C AMPLIFIER) Disconnect the connector from the A/C amplifier. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition A10-20 (TPM) - A30-3 Always Below 1 ohms A10-13 (SG) - A30-1 Always Below 1 ohms A10-12 (S5) - A30-2 Always Below 1 ohms A10-20 (TPM) - Body ground Always 10 kohms or higher A10-13 (SG) - Body ground Always 10 kohms or higher A10-12 (S5) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE A/C AMPLIFIER

The air mix control servo motor (air mix damper servo sub-assembly) is controlled by the A/C amplifier. The air mix control servo motor moves the air mix damper by rotating (normal, reverse) with electrical power from the A/C amplifier.

This adjusts the mix ratio of the air that passes through the evaporator and heater core and controls the air flow temperature. Air flow temperature changes when the air mix damper is moved to the target point. The target point can be detected by the air mix damper position sensor.

DTC DETECTION CONDITION AND TROUBLE AREA

Scheme 60

Scheme 61

Scheme 62

Scheme 63

1. READ VALUE OF INTELLIGENT TESTER Connect the intelligent tester to the DLC3. Turn the ignition switch to the ON position and turn the intelligent tester main switch on. Select the items below in the DATA LIST, and read the display on the intelligent tester. DATA LIST / AIR CONDITIONER TESTER DISPLAY AND DATA LIST Tester Display Measurement Item/Range Normal Condition A/M DAMP POS-P Air mix damper position (Passenger side) / min.: -14%, max.: 113.5% Damper is at "MAX. COOL": -5% Damper is at "MAX. HOT": 105% A/M DAMP TARG-P Air mix damper target position (Passenger side) / min.: -14%, max.: 113.5% OK: When the target position is "MAX. COOL" (-5%), the actual opening angle is 19.0% or less. When the target position is "MAX. HOT" (105%), the actual opening angle is 81.0% or more. Result RESULT REFERENCE Result Proceed to NG A OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE) B OK (When troubleshooting according to the DTC) C B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE C: REPLACE A/C AMPLIFIER A: Go to next step
2. PERFORM ACTIVE TEST BY INTELLIGENT TESTER Connect the intelligent tester to the DLC3. Turn the ignition switch to the ON position and turn the intelligent tester main switch on. Select the item below in the ACTIVE TEST and then check the air flow temperature by hand. ACTIVE TEST / AIR CONDITIONER TESTER DISPLAY AND ACTIVE TEST Tester Display Test Part Control Range AIR MIX DAMP-P Air mix damper (Passenger side) min.: -14%, max.: 113.5% OK: When the lever is moved to the "MAX. HOT" side, warm air comes out. When the lever is moved to the "MAX. COOL" side, cool air comes out. Result RESULT REFERENCE Result Proceed to NG A OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE) B OK (When troubleshooting according to the DTC) C B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE C: REPLACE A/C AMPLIFIER A: Go to next step
3. PERFORM ACTUATOR CHECK Enter the actuator check mode (See «CHECK MODE PROCEDURE»(ref-282137-S06475838302008032900000) ). Press the DEF switch and change to the step operation. Check the air flow temperature by hand. DISPLAY CODE REFERENCE Display Code Air Mix Damper Operation 0 "COOL" side (-5%) 1 "COOL" side (-5%) 2 "COOL" side (-5%) 3 "COOL" side (-5%) 4 "COOL"/"HOT" (50.0% opened) 5 "COOL"/"HOT" (50.0% opened) 6 "HOT" side (105%) 7 "HOT" side (105%) 8 "HOT" side (105%) 9 "HOT" side (105%) OK: Air flow temperature changes in accordance with each display code. Result RESULT REFERENCE Result Proceed to NG A OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE) B OK (When troubleshooting according to the DTC) C B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE C: REPLACE A/C AMPLIFIER A: Go to next step
4. INSPECT AIR MIX CONTROL SERVO MOTOR Remove the air mix control servo motor. Disconnect the connector from the air mix control servo motor. Connect the positive (+) lead from the battery to terminal 5 and the negative (-) lead to terminal 4, then check that the lever turns to the "MAX. HOT" position smoothly. OK: Lever turns to "MAX. HOT" position smoothly. Connect the positive (+) lead from the battery to terminal 4 and the negative (-) lead to terminal 5, then check that the lever turns to the "MAX. COOL" position smoothly. OK: Lever turns to "MAX. COOL" position smoothly. NG: REPLACE AIR MIX CONTROL SERVO MOTOR OK: Go to next step
5. CHECK HARNESS AND CONNECTOR (AIR MIX CONTROL SERVO MOTOR - A/C AMPLIFIER) Disconnect the connector from the A/C amplifier. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition A9-15 (AMPC) - A18-4 Always Below 1 ohms A9-14 (AMPH) - A18-5 Always Below 1 ohms A9-15 (AMPC) - Body ground Always 10 kohms or higher A9-14 (AMPH) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE A/C AMPLIFIER

The air Inlet control servo motor is controlled by the A/C amplifier and moved to the desired position. The air inlet control servo motor switches the air inlet mode by rotating (normal, reverse) with electrical power from the A/C amplifier. This controls intake air and changes the mode between "RECIRCULATION", "FRESH", and "HALF-RECIRCULATION".

DTC DETECTION CONDITION AND TROUBLE AREA

Scheme 64

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Scheme 67

1. READ VALUE OF INTELLIGENT TESTER Connect the intelligent tester to the DLC3. Turn the ignition switch to the ON position and turn the intelligent tester main switch on. Select the items below in the DATA LIST, and read the display on the intelligent tester. DATA LIST / AIR CONDITIONER TESTER DISPLAY AND DATA LIST Tester Display Measurement Item/Range Normal Condition Diagnostic Note A/I DAMP POS Air inlet damper position / min.: -14%, max.: 113.5% Damper is at "RECIRCULATION": -10% Damper is at "HALF-RECIRCULATION": 35 to 75% Damper is at "FRESH": 110% Open in the circuit: 50.0% A/I DAMP TARG Air inlet damper target position / min.: -14%, max.: 113.5% OK: When the target position is "RECIRCULATION" (-10%), the actual opening angle is 19.0% or less. When the target position is "FRESH" (110%), the actual opening angle is 81.0% or more. Result RESULT REFERENCE Result Proceed to NG A OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE) B OK (When troubleshooting according to the DTC) C B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE C: REPLACE A/C AMPLIFIER A: Go to next step
2. PERFORM ACTIVE TEST BY INTELLIGENT TESTER Remove the glove box to see and check the recirculation damper operation. Connect the intelligent tester to the DLC3. Turn the ignition switch to the ON position and turn the intelligent tester main switch on. Select the item below in the ACTIVE TEST and then check that the damper operates. ACTIVE TEST / AIR CONDITIONER TESTER DISPLAY AND ACTIVE TEST Tester Display Test Part Control Range A/I DAMP-LINEAR Air inlet damper position (linear) min.: -14%, max.: 113.5% OK: Lever turns from "RECIRCULATION" side to "FRESH" side smoothly. Lever turns from "FRESH" side to "RECIRCULATION" side smoothly. Result RESULT REFERENCE Result Proceed to NG A OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE) B OK (When troubleshooting according to the DTC) C B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE C: REPLACE A/C AMPLIFIER A: Go to next step
3. PERFORM ACTUATOR CHECK Remove the glove box to see and check the recirculation damper operation. Enter the actuator check mode (See «CHECK MODE PROCEDURE»(ref-282137-S06475838302008032900000) ). Press the DEF switch and check the operation of the recirculation damper. DISPLAY CODE REFERENCE Display Code Recirculation Damper Position 0 FRESH (110%) 1 FRESH (110%) 2 FRESH (110%) 3 R/F (50%) 4 RECIRCULATION (-10%) 5 RECIRCULATION (-10%) 6 RECIRCULATION (-10%) 7 RECIRCULATION (-10%) 8 RECIRCULATION (-10%) 9 RECIRCULATION (-10%) OK: Recirculation damper position changes in accordance with each display code. Result RESULT REFERENCE Result Proceed to NG A OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE) B OK (When troubleshooting according to the DTC) C B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE C: REPLACE A/C AMPLIFIER A: Go to next step
4. INSPECT AIR INLET CONTROL SERVO MOTOR Remove the air inlet control servo motor. Disconnect the connector from the air inlet control servo motor. Connect the positive (+) lead from the battery to terminal 5 and the negative (-) lead to terminal 4, then check that the lever turns to the "FRESH" position smoothly. OK: Lever turns to "FRESH" position smoothly. Connect the positive (+) lead from the battery to terminal 4 and the negative (-) lead to terminal 5, then check that the lever turns to the "RECIRCULATION" position smoothly. OK: Lever turns to "RECIRCULATION" position smoothly. NG: REPLACE AIR INLET CONTROL SERVO MOTOR OK: Go to next step
5. CHECK HARNESS AND CONNECTOR (AIR INLET CONTROL SERVO MOTOR - A/C AMPLIFIER) Disconnect the connector from the A/C amplifier. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition A9-17 (AIR) - A16-4 Always Below 1 ohms A9-16 (AIF) - A16-5 Always Below 1 ohms A9-17 (AIR) - Body ground Always 10 kohms or higher A9-16 (AIF) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE A/C AMPLIFIER

This circuit turns the servo motor and changes each damper position by receiving the signals from the A/C amplifier.

The air outlet damper servo motor switches the air outlet mode by rotating (normal, reverse) with electrical power from the A/C amplifier.

When the AUTO switch is on, the A/C amplifier changes the mode between "FACE", "FACE/FOOT" and "FOOT" according to the temperature setting.

DTC DETECTION CONDITION AND TROUBLE AREA

Scheme 68

Scheme 69

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Scheme 71

1. READ VALUE OF INTELLIGENT TESTER Connect the intelligent tester to the DLC3. Turn the ignition switch to the ON position and turn the intelligent tester main switch on. Select the items below in the DATA LIST, and read the display on the intelligent tester. DATA LIST / AIR CONDITIONER TESTER DISPLAY AND DATA LIST Tester Display Measurement Item/Range Normal Condition Diagnostic Note A/O DAMP POS Air outlet damper position / min.: -14%, max.: 113.5% Damper is at "FACE": 0% Damper is at "FACE/FOOT": 33.5% Damper is at "FOOT": 53.5% Damper is at "FACE/DEF": 73.5% Damper is at "DEF": 100% Open in the circuit: 50.0% A/O DAMP TARG Air outlet damper target position / min.: -14%, max.: 113.5% OK: When the target position is "FACE" (0%), the actual opening angle is 19.0% or less. When the target position is "DEF" (100%), the actual opening angle is 81.0% or more. Result RESULT REFERENCE Result Proceed to NG A OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE) B OK (When troubleshooting according to the DTC) C B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE C: REPLACE A/C AMPLIFIER A: Go to next step
2. PERFORM ACTIVE TEST BY INTELLIGENT TESTER Connect the intelligent tester to the DLC3. Turn the ignition switch to the ON position and turn the intelligent tester main switch on. Select the item below in the ACTIVE TEST and then check that the air flow position by hand. ACTIVE TEST / AIR CONDITIONER TESTER DISPLAY AND ACTIVE TEST Tester Display Test Part Control Range A/O MODE DAMP-D Air outlet damper position(Driver side) min.: -14%, max.: 113.5% OK: Air comes out from the selected air outlet. Result RESULT REFERENCE Result Proceed to NG A OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE) B OK (When troubleshooting according to the DTC) C B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE C: REPLACE A/C AMPLIFIER A: Go to next step
3. PERFORM ACTUATOR CHECK Warm up the engine. Enter the actuator check mode (See «CHECK MODE PROCEDURE»(ref-282137-S06475838302008032900000) ). Press the DEF switch and change to step operation. Press the DEF switch and check the air flow by hand. DISPLAY CODE REFERENCE Display Code Air Flow Condition 0 FACE (0%) 1 FACE (0%) 2 FACE (0%) 3 FACE (0%) 4 FACE (0%) 5 FACE/FOOT (33.5%) 6 FOOT (53.5%) 7 FOOT (53.5%) 8 FACE/DEF (73.5%) 9 DEF (100%) OK: Air outlet mode changes in accordance with each display code. Result RESULT REFERENCE Result Proceed to NG A OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE) B OK (When troubleshooting according to the DTC) C B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE C: REPLACE A/C AMPLIFIER A: Go to next step
4. INSPECT AIR OUTLET CONTROL SERVO MOTOR Remove the air outlet control servo motor. Disconnect the connector from the air outlet control servo motor. Connect the positive (+) lead from the battery to terminal 4 and the negative (-) lead to terminal 5, then check that the lever turns to the "DEF" position smoothly. OK: Lever turns to "DEF" position smoothly. Connect the positive (+) lead from the battery to terminal 5 and the negative (-) lead to terminal 4, then check that the lever turn to the "FACE" position smoothly. OK: Lever turns to "FACE" position smoothly. NG: REPLACE AIR OUTLET CONTROL SERVO MOTOR OK: Go to next step
5. CHECK HARNESS AND CONNECTOR (AIR OUTLET CONTROL SERVO MOTOR - A/C AMPLIFIER) Disconnect the connector from the A/C amplifier. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition A9-40 (AOF) - A19-5 Always Below 1 ohms A9-39 (AOD) - A19-4 Always Below 1 ohms A9-40 (AOF) - Body ground Always 10 kohms or higher A9-39 (AOD) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE A/C AMPLIFIER

The air mix control servo motor (air mix damper servo sub-assembly) is controlled by the A/C amplifier. The air mix control servo motor moves the air mix damper by rotating (normal, reverse) with electrical power from the A/C amplifier.

This adjusts the mix ratio of the air that passes through the evaporator and heater core and controls the air flow temperature. Air flow temperature changes when moving the air mix damper to the target point. The target point can be detected by the air mix damper position sensor.

DTC DETECTION CONDITION AND TROUBLE AREA

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1. READ VALUE OF INTELLIGENT TESTER Connect the intelligent tester to the DLC3. Turn the ignition switch to the ON position and turn the intelligent tester main switch on. Select the items below in the DATA LIST, and read the display on the intelligent tester. DATA LIST / AIR CONDITIONER TESTER DISPLAY AND DATA LIST Tester Display Measurement Item/Range Normal Condition A/M DAMP POS-D Air mix damper position (Driver side) / min.: -14%, max.: 113.5% Damper is at "MAX. COOL": -5% Damper is at "MAX. HOT": 105% A/M DAMP TARG-D Air mix damper target position (Driver side) / min.: -14%, max.: 113.5% OK: When the target position is "MAX. COOL" (-5%), the actual opening angle is 19.0% or less. When the target position is "MAX. HOT" (105%), the actual opening angle is 81.0% or more. Result RESULT REFERENCE Result Proceed to NG A OK (When troubleshooting according to the PROBLEM SYMPTOM TABLE) B OK (When troubleshooting according to the DTC) C B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE C: REPLACE A/C AMPLIFIER A: Go to next step
2. PERFORM ACTIVE TEST BY INTELLIGENT TESTER Connect the intelligent tester to the DLC3. Turn the ignition switch to the ON position and turn the intelligent tester main switch on. Select the item below in the ACTIVE TEST and then check the air flow temperature by hand. ACTIVE TEST / AIR CONDITIONER TESTER DISPLAY AND ACTIVE TEST Tester Display Test Part Control Range AIR MIX DAMP-D Air mix damper (Driver side) min.: -14%, max.: 113.5% OK: When the lever is moved to the "MAX. HOT" side, warm air comes out. When the lever is moved to the "MAX. COOL" side, cool air comes out. Result RESULT REFERENCE Result Proceed to NG A OK (When troubleshooting according to the PROBLEM SYMPTOM TABLE) B OK (When troubleshooting according to the DTC) C B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE C: REPLACE A/C AMPLIFIER A: Go to next step
3. PERFORM ACTUATOR CHECK Enter the actuator check mode (See «CHECK MODE PROCEDURE»(ref-282137-S06475838302008032900000) ). Press the DEF switch and change to the step operation. Check the air flow temperature by hand. DISPLAY CODE REFERENCE Display Code Air Mix Damper Operation 0 "COOL" side (-5%) 1 "COOL" side (-5%) 2 "COOL" side (-5%) 3 "COOL" side (-5%) 4 "COOL"/"HOT" (50% opened) 5 "COOL"/"HOT" (50% opened) 6 "HOT" side (105%) 7 "HOT" side (105%) 8 "HOT" side (105%) 9 "HOT" side (105%) OK: Air flow temperature changes in accordance with each display code. Result RESULT REFERENCE Result Proceed to NG A OK (When troubleshooting according to the PROBLEM SYMPTOM TABLE) B OK (When troubleshooting according to the DTC) C B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE C: REPLACE A/C AMPLIFIER A: Go to next step
4. INSPECT AIR MIX CONTROL SERVO MOTOR Remove the air mix control servo motor. Disconnect the connector from the air mix control servo motor. Connect the positive (+) lead from the battery to terminal 5 and the negative (-) lead to terminal 4, then check that the lever turns to the "MAX. HOT" position smoothly. OK: Lever turns to "MAX. HOT" position smoothly. Connect the positive (+) lead from the battery to terminal 4 and the negative (-) lead to terminal 5, then check that the lever turns to the "MAX. COOL" position smoothly. OK: Lever turns to "MAX. COOL" position smoothly. NG: REPLACE AIR MIX CONTROL SERVO MOTOR OK: Go to next step
5. CHECK HARNESS AND CONNECTOR (AIR MIX CONTROL SERVO MOTOR - A/C AMPLIFIER) Disconnect the connector from the A/C amplifier. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition A9-13 (AMDC) - A17-4 Always Below 1 ohms A9-12 (AMDH) -A17-5 Always Below 1 ohms A9-13 (AMDC) - Body ground Always 10 kohms or higher A9-12 (AMDH) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE A/C AMPLIFIER

The rear air mix control servo motor (water valve servo motor) is controlled by the A/C amplifier.

The rear air mix control servo motor moves the air mix damper by rotating (normal, reverse) with electrical power from the A/C amplifier.

DTC DETECTION CONDITION AND TROUBLE AREA

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1. READ VALUE OF INTELLIGENT TESTER Connect the intelligent tester to the DLC3. Turn the ignition switch to the ON position and turn the intelligent tester main switch on. Select the items in the DATA LIST, and read the display on the intelligent tester. DATA LIST / AIR CONDITIONER TESTER DISPLAY AND DATA LIST Tester Display Measurement Item/Range Normal Condition A/M DAMP POS-R Air mix damper position (Rear) / min.:-14%, max.: 113.5% Damper is at "MAX. COOL": 0% Damper is at "MAX. HOT": 86.5% A/M DAMP TARG-R Air mix damper target position (Rear)/min.: -14%, max.: 113.5% OK: When the target position is "MAX. COOL" (0%), the actual opening angle is 19.0% or less. When the target position is "MAX. HOT" (86.5%), the actual opening angle is 81.0% or more. Result RESULT REFERENCE Result Proceed to NG A OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE) B OK (When troubleshooting according to the DTC) C B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE C: REPLACE A/C AMPLIFIER A: Go to next step
2. PERFORM ACTIVE TEST BY INTELLIGENT TESTER Connect the intelligent tester to the DLC3. Turn the ignition switch to the ON position and turn the intelligent tester main switch on. Select the item below in the ACTIVE TEST and then check the air flow temperature by hand. ACTIVE TEST/AIR CONDITIONER TESTER DISPLAY AND ACTIVE TEST Tester Display Test Part Control Range AIR MIX DAMP-R Air mix damper (Rear) min.: -14%, max.: 113.5% OK: When the lever is moved to the "MAX. HOT" side, warm air comes out. When the lever is moved to the "MAX. COOL" side, cool air comes out. Result RESULT REFERENCE Result Proceed to NG A OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE) B OK (When troubleshooting according to the DTC) C B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE C: REPLACE A/C AMPLIFIER A: Go to next step
3. PERFORM ACTUATOR CHECK Enter the actuator check mode (See «CHECK MODE PROCEDURE»(ref-282137-S06475838302008032900000) ). Press the DEF switch and change to the step operation. Check the air flow temperature by hand. DISPLAY CODE REFERENCE Display Code Air Mix Damper Operation 0 "COOL" side (0%) 1 "COOL" side (0%) 2 "COOL"/"HOT" (40% opened) 3 "COOL"/"HOT" (40% opened) 4 "COOL"/"HOT" (40% opened) 5 "COOL"/"HOT" (60% opened) 6 "COOL"/"HOT" (60% opened) 7 "COOL"/"HOT" (60% opened) 8 "HOT" side (86.5% opened) 9 "HOT" side (86.5% opened) OK: Air flow temperature changes in accordance with each display code. Result RESULT REFERENCE Result Proceed to NG A OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE) B OK (When troubleshooting according to the DTC) C B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE C: REPLACE A/C AMPLIFIER A: Go to next step
4. INSPECT REAR AIR MIX CONTROL SERVO MOTOR (WATER VALVE SERVO MOTOR) Remove the rear air mix control servo motor (water valve servo motor). Disconnect the connector from the rear air mix control servo motor. Connect the positive (+) lead from the battery to terminal 5 and the negative (-) lead to terminal 4, then check that the lever turns to the "MAX. COOL" position smoothly. OK: Lever turns to "MAX. COOL" position smoothly. Connect the positive (+) lead from the battery to terminal 4 and the negative (-) lead to terminal 5, then check that the lever turns to the "MAX. HOT" position smoothly. OK: Lever turns to "MAX. HOT" position smoothly. NG: REPLACE REAR AIR MIX CONTROL SERVO MOTOR (WATER VALVE SERVO MOTOR) OK: Go to next step
5. CHECK HARNESS AND CONNECTOR (REAR AIR MIX CONTROL SERVO MOTOR - A/C AMPLIFIER) Disconnect the connector from the A/C amplifier. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition A10-3 (MHH) - W2-4 Always Below 1 ohms A10-4 (MCH) - W2-5 Always Below 1 ohms A10-3 (MHH) - Body ground Always 10 kohms or higher A10-4 (MCH) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE A/C AMPLIFIER

This circuit turns the servo motor and changes each damper position by receiving the signals from the A/C amplifier.

The rear air outlet damper servo motor switches the air outlet mode by rotating (normal, reverse) with electrical power from the A/C amplifier.

DTC DETECTION CONDITION AND TROUBLE AREA

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1. READ VALUE OF INTELLIGENT TESTER Connect the intelligent tester to the DLC3. Turn the ignition switch to the ON position and turn the intelligent tester main switch on. Select the items below in the DATA LIST, and read the display on the intelligent tester. DATA LIST / AIR CONDITIONER TESTER DISPLAY AND DATA LIST Tester Display Measurement Item/Range Normal Condition Diagnostic Note A/O DAMP POS-R Air outlet mode damper position (Rear) / min.: -14%, max.: 113.5% Damper is at "FACE1": 0% Damper is at "FACE2": 16.5% Damper is at "FACE/FOOT": 44% Damper is at "FOOT": 100% Open in the circuit: 50.0% A/O DAMP TARG-R Air outlet mode damper target position (Rear) / min.: -14%, max.: 113.5% OK: When the target position is "FACE1" (0%), the actual opening angle is 19.0% or less. When the target position is "FOOT" (100%), the actual opening angle is 81.0% or more. Result RESULT REFERENCE Result Proceed to NG A OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE) B OK (When troubleshooting according to the DTC) C B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE C: REPLACE A/C AMPLIFIER A: Go to next step
2. PERFORM ACTIVE TEST BY INTELLIGENT TESTER Connect the intelligent tester to the DLC3. Turn the ignition switch to the ON position and turn the intelligent tester main switch on. Select the item below in the ACTIVE TEST and then check the air flow position by hand. ACTIVE TEST / AIR CONDITIONER TESTER DISPLAY AND ACTIVE TEST Tester Display Test Part Control Range A/O MODE DAMP-R Air outlet damper position (Rear) min.: -14%, max.: 113.5% OK: Air comes out from the selected air outlet. Result RESULT REFERENCE Result Proceed to NG A OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE) B OK (When troubleshooting according to the DTC) C B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE C: REPLACE A/C AMPLIFIER A: Go to next step
3. PERFORM ACTUATOR CHECK Warm up the engine. Enter the actuator check mode (See «CHECK MODE PROCEDURE»(ref-282137-S06475838302008032900000) ). Press the DEF switch and change to step operation. Press the DEF switch and check the air flow by hand. DISPLAY CODE REFERENCE Display Code Air flow condition 0 FACE1 (0%) 1 FACE1 (0%) 2 FACE1 (0%) 3 FACE2 (16.5%) 4 FACE/FOOT (44%) 5 FACE/FOOT (44%) 6 FACE/FOOT (44%) 7 FOOT (100%) 8 FOOT (100%) 9 FOOT (100%) OK: Air outlet mode changes in accordance with each display code. Result RESULT REFERENCE Result Proceed to NG A OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE) B OK (When troubleshooting according to the DTC) C B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE C: REPLACE A/C AMPLIFIER A: Go to next step
4. INSPECT REAR AIR OUTLET CONTROL SERVO MOTOR Remove the rear air outlet control servo motor. Disconnect the connector from the rear air outlet control servo motor. Connect the positive (+) lead from the battery to terminal 4 and the negative (-) lead to terminal 5, then check that the lever turns to the "FOOT" position smoothly. OK: Lever turns to "FOOT" position smoothly. Connect the positive (+) lead from the battery to terminal 5 and the negative (-) lead to terminal 4, then check that the lever turn to the "FACE" position smoothly. OK: Lever turns to "FACE" position smoothly. NG: REPLACE REAR AIR OUTLET CONTROL SERVO MOTOR OK: Go to next step
5. CHECK HARNESS AND CONNECTOR (REAR AIR OUTLET CONTROL SERVO MOTOR A/C AMPLIFIER) Disconnect the connector from the A/C amplifier. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition A10-2 (FACE) - A30-5 Always Below 1 ohms A10-1 (FOOT) - A30-4 Always Below 1 ohms A10-2 (FACE) - Body ground Always 10 kohms or higher A10-1 (FOOT) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE A/C AMPLIFIER

In this circuit, the compressor receives a refrigerant compression demand signal from the A/C amplifier. Based on this signal, the compressor changes the amount of compressor output.

DTC DETECTION CONDITION AND TROUBLE AREA

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1. INSPECT A/C COMPRESSOR Disconnect the A/C compressor connector. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition A32-2 (SOL+) - A32-1 (SOL-) 20°C (68°F) 10 to 11 ohms NG: REPLACE A/C COMPRESSOR OK: Go to next step
2. CHECK HARNESS AND CONNECTOR (A/C COMPRESSOR - BODY GROUND) Disconnect the A/C compressor connector. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition A32-1 (SOL-) - Body ground Always Below 1 ohms NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (A/C COMPRESSOR - A/C AMPLIFIER) Disconnect the A/C compressor connector. Disconnect the A/C amplifier connector. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition A9-4 (SOL+) - A32-2 (SOL+) Always Below 1 ohms A9-4 (SOL+) - Body ground Always 10 kohms or higher Result RESULT REFERENCE Result Proceed to NG A OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE) B OK (When troubleshooting according to the DTC) C B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE C: REPLACE A/C AMPLIFIER A: REPAIR OR REPLACE HARNESS OR CONNECTOR

DTC DETECTION CONDITION AND TROUBLE AREA

When the A/C amplifier is turned on, a magnetic clutch ON signal is sent from the MGC terminal of the A/C amplifier. Then, the MG CLT relay turns on to operate the magnetic clutch.

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1. CHECK CAN COMMUNICATION SYSTEM Use the intelligent tester to check if the CAN communication system is functioning normally. Result RESULT REFERENCE Result Proceed to CAN DTC is not output A CAN DTC is output B B: GO TO «CAN COMMUNICATION SYSTEM»(ref-282149-S22258365312008032900000) A: Go to next step
2. CHECK MULTIPLEX COMMUNICATION SYSTEM Use the intelligent tester to check if the multiplex communication system is functioning normally. Result RESULT REFERENCE Result Proceed to MPX DTC is not output A MPX DTC is output B B: GO TO «MULTIPLEX COMMUNICATION SYSTEM»(ref-282150-S23766576272008032900000) A: Go to next step
3. PERFORM ACTIVE TEST BY INTELLIGENT TESTER Connect the intelligent tester to the DLC3. Turn the ignition switch to the ON position and turn the intelligent tester main switch on. Select the item below in the ACTIVE TEST and then check that the relay operates. ACTIVE TEST / AIR CONDITIONER: TESTER DISPLAY AND ACTIVE TEST Tester Display Test Part Control Range A/C MAG CLUTCH Magnetic clutch relay OFF, ON- OK: Magnetic clutch relay operates. NG: Go to step 4 OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
4. INSPECT FUSE (HTR) Remove the HTR fuse from the driver side junction block. Measure the resistance according to the value(s) in the table below. Standard resistance ITEM CONDITION CHART Tester Item Condition Specified Condition HTR fuse Always Below 1 ohms Reconnect the HTR fuse to the driver side junction block. NG: REPLACE FUSE (HTR) OK: Go to next step
5. INSPECT RELAY (MG CLT) Remove the MG CLT relay from the No. 3 relay block. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Specified Condition 3 - 5 10 kohms or higher 3 - 5 Below 1 ohms (when battery voltage is applied to terminals 1 and 2) Install the MG CLT relay to the No. 3 relay block. NG: REPLACE RELAY (MG CLT) OK: Go to next step
6. CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - BATTERY) Disconnect the connector from the A/C amplifier. Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition A9-5 (MGC) - Body ground Ignition switch: OFF Below 1 V A9-5 (MGC) - Body ground Ignition switch: ON 11 to 14 V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
7. INSPECT A/C AMPLIFIER Reconnect the connector to the A/C amplifier. Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition A9-5 (MGC) - Body ground Ignition switch: ON A/C switch: OFF 11 to 14 V A9-5 (MGC) - Body ground Ignition switch: ON A/C switch: ON Below 1 V NG: REPLACE A/C AMPLIFIER OK: Go to next step
8. INSPECT COMPRESSOR AND MAGNETIC CLUTCH Disconnect the connector from the compressor and magnetic clutch. Disconnect the connector from the magnetic clutch. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition A32-3 (MG+) - A-1 Always Below 1 ohms A32-3 (MG+) - Body ground Always 10 kohms or higher NG: REPLACE COMPRESSOR AND MAGNETIC CLUTCH OK: Go to next step
9. INSPECT MAGNETIC CLUTCH Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition A-1 - Body ground Always 3.4 to 3.8 ohms When connector terminal A1 is connected to the positive (+) battery terminal, 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 OK: Go to next step
10. CHECK HARNESS AND CONNECTOR (NO. 3 RELAY BLOCK - BATTERY) Remove the MG CLT relay from the No. 3 relay block. Turn the ignition switch to the ON position. Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Specified Condition Relay block MG CLT relay terminal 5 - Body ground 11 to 14 V Relay block MG CLT relay terminal 1 - Body ground 11 to 14 V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (NO. 3 RELAY BLOCK - COMPRESSOR AND MAGNETIC CLUTCH) OK: REPAIR OR REPLACE HARNESS OR CONNECTOR

This is the rear A/C system control signal circuit as well as the power supply circuit of the rear A/C control assembly.

Pulse signals regarding rear A/C control panel switch operation are transmitted between the A/C amplifier and rear A/C control assembly.

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1. CHECK HARNESS AND CONNECTOR (REAR A/C CONTROL ASSEMBLY - BATTERY) Disconnect the connector from the rear A/C control assembly. Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition R18-9 (IG) - Body ground Ignition switch: ON 11 to 14 V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
2. CHECK HARNESS AND CONNECTOR (REAR A/C CONTROL ASSEMBLY - BODY GROUND) Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition R18-6 (E) - Body ground Always Below 1 ohms NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (REAR A/C CONTROL ASSEMBLY - A/C AMPLIFIER) Disconnect the connector from the A/C amplifier. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition R18-2 (BLK) - A10-11 (BLK) Always Below 1 ohms R18-3 (STX) - A10-10 (STX) Always Below 1 ohms R18-4 (CLK) - A10-9 (CLKR) Always Below 1 ohms R18-5 (DPD) - A10-8 (DPD) Always Below 1 ohms R18-10 (SWD) - A10-7 (SWD) Always Below 1 ohms R18-2 (BLK) - Body ground Always 10 kohms or higher R18-3 (STX) - Body ground Always 10 kohms or higher R18-4 (CLK) - Body ground Always 10 kohms or higher R18-5 (DPD) - Body ground Always 10 kohms or higher R18-10 (SWD) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

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

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1. INSPECT RELAY (RR A/C) Remove the RR A/C relay from the No. 3 relay block. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition 3 - 4 Always Below 1 ohms 3 - 4 When battery voltage applied to terminals 1 and 2 10 kohms or higher 3 - 5 Always 10 kohms or higher 3 - 5 When battery voltage applied to terminals 1 and 2 Below 1 ohms NG: REPLACE RELAY (RR A/C) OK: Go to next step
2. CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - BATTERY) Disconnect the connector from the A/C amplifier. Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition A9-8 (HRH) - Body ground Ignition switch: ON Rear blower control dial: OFF 11 to 14 V A9-8 (HRH) - Body ground Ignition switch: ON Rear blower control dial: ON Below 1 V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

Power to the rear blower motor is supplied from the battery via the RR A/C relay.

The rear blower motor speed level varies between 0 and 31 based on the voltage difference measured between the terminals of the motor.

The voltage difference measured between the terminals of the rear blower motor changes in proportion to the control at the rear blower motor controller on the ground side.

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1. READ VALUE OF INTELLIGENT TESTER Connect the intelligent tester to the DLC3. Turn the ignition switch to the ON position and turn the intelligent tester main switch on. Select the item below in the DATA LIST, and read the display on the intelligent tester. DATA LIST / AIR CONDITIONER TESTER DISPLAY AND DATA LIST Tester Display Measurement Item/Range Normal Condition BLOWER LEVEL-R Blower motor speed level (Rear) / min.: Level 0, max.: Level 31 Changes depending on blower level (Rear) OK: The display is as specified in the normal condition. NG: Go to step 2 OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
2. INSPECT REAR BLOWER MOTOR Remove the rear blower motor with the connector still connected. Disconnect the connector from the rear blower motor. Connect the positive (+) lead to terminal 1 of the rear blower motor connector, and the negative (-) lead to terminal 2. OK: The rear blower motor operates smoothly. NG: REPLACE REAR BLOWER MOTOR OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (REAR BLOWER MOTOR - BATTERY) Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition B13-2 - Body ground Ignition switch: ON Rear blower control dial: OFF Below 1 V B13-2 - Body ground Ignition switch: ON Rear blower control dial: ON 11 to 14 V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. CHECK HARNESS AND CONNECTOR (REAR BLOWER MOTOR CONTROLLER - BODY GROUND) Disconnect the connector from the rear blower motor controller. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition B15-1 - Body ground Always Below 1 ohms NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
5. CHECK HARNESS AND CONNECTOR (REAR BLOWER MOTOR - REAR BLOWER MOTOR CONTROLLER) Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition B13-1 - B15-3 Always Below 1 ohms B13-1 - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
6. CHECK HARNESS AND CONNECTOR (REAR BLOWER MOTOR CONTROLLER - A/C AMPLIFIER) Disconnect the connector from the A/C amplifier. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition A10-5 (BLWH) - B15-2 Always Below 1 ohms A10-6 (VMH) - B15-4 Always Below 1 ohms A10-5 (BLWH) - Body ground Always 10 kohms or higher A10-6 (VMH) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
7. INSPECT REAR BLOWER MOTOR CONTROLLER Disconnect the connector from the rear blower motor controller. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition B15-3 - B15-4 Always 2.0 to 2.4 kohms Connect the positive (+) lead to terminal 3 through a 12 V 3.4 W test bulb, and the negative (-) lead to terminal 1. Connect the three 1.5 V dry cell batteries' positive (+) lead to terminal 2, and the negative (-) lead to terminal 1. Then check that the test bulb comes on. OK: The test bulb comes on. NG: REPLACE REAR BLOWER MOTOR CONTROLLER OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

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

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

Scheme 112

This circuit supplies power to the A/C amplifier and the illumination for the clock.

Scheme 113

Scheme 114

1. INSPECT FUSE (ECU ACC) Remove the ECU ACC fuse from the engine room relay block. Measure the resistance according to the value(s) in the table below. Standard resistance ITEM CONDITION CHART Tester Item Condition Specified Condition ECU ACC Fuse Always Below 1 ohms NG: REPLACE FUSE (ECU ACC) OK: Go to next step
2. CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - BATTERY) Disconnect the connector from the A/C amplifier. Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition A9-19 (ACC) - Body ground Ignition switch: OFF Below 1 V A9-19 (ACC) - Body ground Ignition switch: ACC 11 to 14 V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

This is the back-up power source for the A/C amplifier. Power is supplied even when the ignition switch is off and is used for diagnostic trouble code memory, etc.

Scheme 115

Scheme 116

1. INSPECT FUSE (ECU - B) Remove the ECU - B fuse from the engine room junction block. Measure the resistance according to the value(s) in the table below. Standard resistance ITEM CONDITION CHART 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 (A/C AMPLIFIER - BATTERY) Disconnect the connector from the A/C amplifier. Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition A9-20 (B) - Body ground Always 11 to 14 V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

See also:
• PRECAUTION
• ON-VEHICLE INSPECTION
• REMOVAL