Air Conditioning (Diagnostic Codes & Circuit Tests): Overview Lexus GS III рестайлинг

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1. ACTUATOR CHECK Turn the power switch ON (IG) while pressing the A/C control AUTO switch and Recirculation / Fresh switch simultaneously. Press the Recirculation / Fresh switch. As each damper, motor and relay automatically operate the actuator check at 1 second intervals from step No. 1 to No. 10 continuously, check the temperature and airflow visually and by hand. If a slower display is desired, press the driver temperature up switch and change the display in the step operation. Each time the driver temperature up switch is pressed, the display changes by 1 step. HINT: The buzzer sounds when the displayed trouble code changes. Codes are displayed from smaller to larger numbers in order. To cancel the check mode, press the "OFF" switch. Step No. Display Code Conditions Blower Level Air Mix Damper Airflow Vent Air Inlet Damper Cool Air Bypass Damper Compressor 1 0 0 0% open FACE FRESH -14% OFF 2 1 1 0% open FACE FRESH -14% OFF 3 2 17 0% open FACE RECIRCULATION / FRESH -14% ON 4 3 17 0% open FACE RECIRCULATION 113.50% ON 5 4 17 50% open B/L RECIRCULATION 113.50% ON 6 5 17 50% open B/L RECIRCULATION 113.50% ON 7 6 17 50% open FOOT FRESH 113.50% ON 8 7 17 100% open FOOT-0 FRESH 113.50% ON 9 8 17 100% open F/D FRESH 113.50% ON 10 9 31 100% open DEF FRESH 113.50% ON

DESCRIPTION

The room temperature sensor is installed in the instrument panel to detect the room temperature and control the heater and air conditioner "AUTO" mode. The resistance of the room temperature sensor changes in accordance with the room 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 room temperature sensor and reads voltage changes as the resistance of the room temperature sensor changes. This sensor also sends the appropriate signals to the A/C amplifier. The room temperature sensor is integrated with the room humidity sensor.

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1. READ VALUE USING TECHSTREAM (ROOM TEMP) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Select the item below in the Data List, and read the display on the Techstream. DATA LIST / AIR CONDITIONER Tester Display Measurement Item/Range Normal Condition Diagnostic Note Room Temperature Sensor (Room Temp) Room temperature sensor / Min.: -6.5°C (20.3°F) Max.: 57.25°C (135.05°F) Actual room temperature is displayed Open in circuit: -6.5°C (20.3°F) Short in circuit: 57.25°C (135.05°F) OK The display is as specified in the normal condition. RESULT Result Proceed to NG A OK (Checking from the PROBLEM SYMPTOMS TABLE) B OK (Checking from the DTC) C C --> REPLACE AIR CONDITIONING AMPLIFIER B --> PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-387145-S36094178262011022400000) A: Go to next step
2. INSPECT ROOM TEMPERATURE SENSOR Remove the room temperature sensor. Measure the resistance of the sensor. Standard resistance Tester Connection Condition Specified Condition 1 (+) - 2 (-) 10°C (50°F) 3.00 to 3.73 kohms 1 (+) - 2 (-) 15°C (59°F) 2.45 to 2.88 kohms 1 (+) - 2 (-) 20°C (68°F) 1.95 to 2.30 kohms 1 (+) - 2 (-) 25°C (77°F) 1.60 to 1.80 kohms 1 (+) - 2 (-) 30°C (86°F) 1.28 to 1.47 kohms 1 (+) - 2 (-) 35°C (95°F) 1.00 to 1.22 kohms 1 (+) - 2 (-) 40°C (104°F) 0.80 to 1.00 kohms 1 (+) - 2 (-) 45°C (113°F) 0.65 to 0.85 kohms 1 (+) - 2 (-) 50°C (122°F) 0.50 to 0.70 kohms 1 (+) - 2 (-) 55°C (131°F) 0.44 to 0.60 kohms 1 (+) - 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 (see the graph. (Scheme 160)). NG --> REPLACE ROOM TEMPERATURE SENSOR OK: Go to next step
3. CHECK WIRE HARNESS (ROOM TEMPERATURE SENSOR - A/C AMPLIFIER) Disconnect the K33 room temperature sensor connector. Disconnect the K52 A/C amplifier connector. Measure the resistance of the wire harness side connectors. Standard resistance Tester Connection Specified Condition K33-1 (+) - K52-16 (TR) Below 1 ohms K33-2 (-) - K52-19 (SG-1) Below 1 ohms K52-16 (TR) - Body ground 10 kohms or higher K52-19 (SG-1) - Body ground 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> REPLACE AIR CONDITIONING AMPLIFIER

The ambient temperature sensor is installed in the front part of the condenser to detect the ambient temperature and control the air conditioner "AUTO" mode. The sensor connected to the ECM detects fluctuations in the ambient temperature. This data is used for controlling the room temperature. The sensor sends a signal to the A/C amplifier via the ECM. 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 ECM applies voltage (5 V) to the ambient temperature sensor and reads voltage changes as the resistance of the ambient temperature sensor changes. The ECM sends the read signal to the A/C amplifier via CAN and body multiplex communications.

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1. READ VALUE USING TECHSTREAM Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Select the item below in the Data List, and read the display on the Techstream. DATA LIST / AIR CONDITIONER Tester Display Measurement Item/Range Normal Condition Diagnostic Note Ambient Temp Sensor (Ambi Temp Sensor) Ambient temperature sensor / Min: -23.3°C (-9.94°F) Max: 65.95°C (150.71°F) Actual ambient temperature is displayed Open in circuit: -23.3°C (-9.94°F) Short in circuit: 65.95°C (150.71°F) OK The display is as specified in the normal condition. RESULT Result Proceed to NG A OK (Checking from the PROBLEM SYMPTOMS TABLE) B OK (Checking from the DTC) C C --> REPLACE AIR CONDITIONING AMPLIFIER B --> PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-387145-S36094178262011022400000) A: Go to next step
2. INSPECT AMBIENT TEMPERATURE SENSOR Remove the ambient temperature sensor. Measure the resistance of the sensor. Standard resistance Tester Connection Condition Specified Condition 1 - 2 10°C (50°F) 3.00 to 3.73 kohms 1 - 2 15°C (59°F) 2.45 to 2.88 kohms 1 - 2 20°C (68°F) 1.95 to 2.30 kohms 1 - 2 25°C (77°F) 1.60 to 1.80 kohms 1 - 2 30°C (86°F) 1.28 to 1.47 kohms 1 - 2 35°C (95°F) 1.00 to 1.22 kohms 1 - 2 40°C (104°F) 0.80 to 1.00 kohms 1 - 2 45°C (113°F) 0.65 to 0.85 kohms 1 - 2 50°C (122°F) 0.50 to 0.70 kohms 1 - 2 55°C (131°F) 0.44 to 0.60 kohms 1 - 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 (see the graph. (Scheme 163)). NG --> REPLACE AMBIENT TEMPERATURE SENSOR OK: Go to next step
3. CHECK WIRE HARNESS (AMBIENT TEMPERATURE SENSOR - ECM) Disconnect the B5 ambient temperature sensor connector. Disconnect the A53 and E83 ECM connectors. Measure the resistance of the wire harness side connectors. Standard resistance Tester Connection Specified Condition B5-1 - A53-53 (TAM) Below 1 ohms B5-2 - E83-97 (E3) Below 1 ohms A53-53 (TAM) - Body ground 10 kohms or higher E83-97 (E3) - Body ground 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> REPLACE ECM

The evaporator temperature sensor (A/C thermistor) is installed on the evaporator in the air conditioner unit to detect the cooled air temperature that has passed through the evaporator and control the air conditioning. It sends appropriate signals to the A/C amplifier. The resistance of the evaporator temperature sensor (A/C thermistor) changes in accordance with the cooled air temperature 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 for frost prevention.

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1. READ VALUE USING TECHSTREAM Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Select the item below in the Data List, and read the display on the Techstream. DATA LIST / AIR CONDITIONER Tester Display Measurement Item/Range Normal Condition Diagnostic Note Evaporator Temp Sensor (Evap Temp) Evaporator temperature sensor / Min.: -29.7°C (-21.46°F) Max.: 59.55°C (139.19°F) Actual evaporator temperature is displayed Open in circuit: -29.7°C (-21.46°F) Short in circuit: 59.55°C (139.19°F) OK The display is as specified in the normal condition. RESULT Result Proceed to NG A OK (Checking from the PROBLEM SYMPTOMS TABLE) B OK (Checking from the DTC) C C --> REPLACE AIR CONDITIONING AMPLIFIER B --> PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-387145-S36094178262011022400000) A: Go to next step
2. INSPECT EVAPORATOR TEMPERATURE SENSOR Disconnect the evaporator temperature sensor connector. Measure the resistance of the sensor. Standard resistance Tester Connection Condition Specified Condition z22-1 - z22-2 -10°C (14°F) 7.30 to 9.10 kohms z22-1 - z22-2 -5°C (23°F) 5.65 to 6.95 kohms z22-1 - z22-2 0°C (32°F) 4.40 to 5.35 kohms z22-1 - z22-2 5°C (41°F) 3.40 to 4.15 kohms z22-1 - z22-2 10°C (50°F) 2.70 to 3.25 kohms z22-1 - z22-2 15°C (59°F) 2.14 to 2.58 kohms z22-1 - z22-2 20°C (68°F) 1.71 to 2.05 kohms z22-1 - z22-2 25°C (77°F) 1.38 to 1.64 kohms z22-1 - z22-2 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 ambient temperature. HINT: As the temperature increases, the resistance decreases (see the graph. (Scheme 166)). NG --> REPLACE EVAPORATOR TEMPERATURE SENSOR OK: Go to next step
3. INSPECT AIR CONDITIONING HARNESS (A/C AMPLIFIER - EVAPORATOR TEMPERATURE SENSOR) Remove the air conditioning harness. Disconnect the A/C amplifier connector. Measure the resistance of the harness. Standard resistance Tester Connection Condition Specified Condition z1-6 (TE) - z22-2 Always Below 1 ohms z1-5 (SG-10) - z22-1 Always Below 1 ohms z1-6 (TE) - Body ground Always 10 kohms or higher z1-5 (SG-10) - Body ground Always 10 kohms or higher NG --> REPLACE AIR CONDITIONING HARNESS OK --> REPLACE AIR CONDITIONING AMPLIFIER

The exhaust gas sensor, which is installed on the front of the condenser, automatically changes to FRESH, FRESH / RECIRCULATION, or RECIRCULATION. The exhaust gas sensor detects CO and HC in the emission gas and transmits signals to the A/C amplifier.

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1. INSPECT FUSE (LH-IG) Remove the LH-IG fuse from the main body ECU LH. Measure the resistance of the fuse. Standard resistance Below 1 ohms NG --> CHECK FOR SHORT IN ALL HARNESSES AND COMPONENTS CONNECTED TO FUSE OK: Go to next step
2. READ VALUE USING TECHSTREAM Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Select the item below in the Data List, and read the display on the Techstream. DATA LIST / AIR CONDITIONER Tester Display Measurement Item/Range Normal Condition Diagnostic Note Emission Gas Sensor (Emiss Gas Sens) Emission gas / Min.: 0 V, Max.: 255 V Increases as the gas amount increases - OK The display is as specified in the normal condition. RESULT Result Proceed to NG A OK (Checking from the PROBLEM SYMPTOMS TABLE) B OK (Checking from the DTC) C C --> REPLACE AIR CONDITIONING AMPLIFIER B --> PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-387145-S36094178262011022400000) A: Go to next step
3. CHECK WIRE HARNESS (EXHAUST GAS SENSOR - BODY GROUND) Disconnect the B10 exhaust gas sensor connector. Measure the resistance of the wire harness side connector. Standard resistance Tester Connection Specified Condition B10-6 (E) - Body ground Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. CHECK WIRE HARNESS (EXHAUST GAS SENSOR - BATTERY) Disconnect the B10 exhaust gas sensor connector. Measure the voltage of the wire harness side connector. Standard voltage Tester Connection Condition Specified Condition B10-3 (IG) - Body ground Power switch ON (IG) 10 to 14 V Power switch OFF Below 1 V NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
5. INSPECT EXHAUST GAS SENSOR Remove the exhaust gas sensor. After applying battery voltage between terminals 3 (IG) and 6 (E) for more than 30 seconds, measure the resistance between terminals 1 (SG) and 2 (DGS). Measure the resistance of the sensor. Standard resistance Tester Connection Condition Specified Condition B10-1 (SG) - B10-2 (DGS) 10 to 35°C (50 to 95°F) 1.5 to 240 kohms HINT: When the sensor is exposed to the exhaust gas, the resistance increases. NG --> REPLACE EXHAUST GAS SENSOR OK: Go to next step
6. CHECK WIRE HARNESS (EXHAUST GAS SENSOR - A/C AMPLIFIER) Disconnect the B10 exhaust gas sensor connector. Disconnect the K52 A/C amplifier connector. Measure the resistance of the wire harness side connectors. Standard resistance Tester Connection Specified Condition B10-1 (SG) - K52-39 (SG-6) Below 1 ohms B10-2 (DGS) - K52-34 (DGS) Below 1 ohms K52-39 (SG-6) - Body ground 10 kohms or higher K52-34 (DGS) - Body ground 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> REPLACE AIR CONDITIONING AMPLIFIER

Scheme 173

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 current from the solar sensor varies according to the amount of sunlight. When the sunlight increases, the output current increases. As the sunlight decreases, the output current decreases. The A/C amplifier detects output current from the solar sensor.

HINT

If DTC B1224 is output at the same time, troubleshoot DTC B1224 first.

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1. READ VALUE USING TECHSTREAM Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Select the item below in the Data List, and read the display on the Techstream. DATA LIST / AIR CONDITIONER Tester Display Measurement Item/Range Normal Condition Diagnostic Note Solar Sensor (P side) (Solar Sens-P) Passenger side solar sensor / Min.: 0, Max.: 255 Passenger side solar sensor voltage increases as brightness increases Open in circuit: 0 Short in circuit: 255 OK The display is as specified in the normal condition. RESULT Result Proceed to NG A OK (Checking from the PROBLEM SYMPTOMS TABLE) B OK (Checking from the DTC) C C --> REPLACE AIR CONDITIONING AMPLIFIER B --> PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-387145-S36094178262011022400000) A: Go to next step
2. CHECK WIRE HARNESS (SOLAR SENSOR) Disconnect the L1 solar sensor connector. Measure the resistance of the wire harness side connector. Standard resistance Tester Connection Condition Specified Condition L1-3 (CLTE) - Body ground Always Below 1 ohms Measure the voltage of the wire harness side connector. Standard voltage Tester Connection Condition Specified Condition L1-6 (CLTB) - L1-3 (CLTE) Power switch ON (IG) 10 to 14 V L1-6 (CLTB) - L1-3 (CLTE) Power switch OFF Below 1 V OK --> See step 4 NG: Go to next step
3. CHECK WIRE HARNESS (MAIN BODY ECU RH - SOLAR SENSOR) Disconnect the K67 and DD main body ECU RH connectors. Disconnect the L1 solar sensor connector. Measure the resistance of the wire harness side connectors. Standard resistance Tester Connection Specified Condition K67-6 (CLTB) - L1-6 (CLTB) Below 1 ohms K67-4 (CLTE) - L1-3 (CLTE) Below 1 ohms K67-6 (CLTB) - Body ground 10 kohms or higher K67-4 (CLTE) - Body ground 10 kohms or higher DD-7 (GND2) - Body ground Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> REPLACE MAIN BODY ECU RH
4. CHECK WIRE HARNESS (SOLAR SENSOR - A/C AMPLIFIER) Disconnect the L1 solar sensor connector. Disconnect the K52 A/C amplifier connector. Measure the resistance of the wire harness side connectors. Standard resistance Tester Connection Specified Condition K52-14 (TSP) - L1-2 (TSR) Below 1 ohms K52-14 (TSP) - Body ground 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
5. CHECK SOLAR SENSOR (TSR VOLTAGE) Remove the solar sensor with its connector still connected. Apply battery voltage between terminals 6 (CLTB) and 3 (CLTE) of the solar sensor. Measure the voltage of the sensor. Standard voltage Tester Connection Condition Specified Condition 2 (TSR) - 3 (CLTE) Sensor is subjected to electric light 0.8 to 4.3 V Sensor is covered with a cloth Below 0.8 V HINT: As the inspection light is moved away from the sensor, the voltage decreases. Use an incandescent light for inspection. Bring it about 30 cm (11.8 in.) from the solar sensor. NG --> REPLACE SOLAR SENSOR OK --> REPLACE AIR CONDITIONING AMPLIFIER

This DTC is output when refrigerant pressure 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 the refrigerant pressure signal to the A/C amplifier. The A/C amplifier converts the signals to pressure according to the sensor characteristics to control the compressor.

HINT

Be sure to check the refrigerant volume first when this DTC is output because this DTC can also be output if there is no refrigerant in the cycle.

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1. CHECK REFRIGERANT Check the sight glass on the liquid pipe. Prepare the vehicle according to the chart below. Item Condition Vehicle Doors Fully open Temperature Setting MAX COLD Blower Speed HI A/C ON Power switch ON (IG) Compare the sight glass to the following chart. Item Symptom Amount of Refrigerant Corrective Actions 1 Bubbles visible Insufficient* Check for gas leakage and repair if necessary Add refrigerant until bubbles disappear 2 No bubbles visible Empty, insufficient or excessive Refer to 3 and 4 3 No temperature difference between compressor inlet and outlet Empty or nearly empty Check for gas leakage with gas leak detector and repair if necessary Evacuate A/C system and recharge proper amount of refrigerant 4 Considerable temperature difference between compressor inlet and outlet Proper or excessive Refer to 5 and 6 5 Immediately after air conditioning is turned OFF, refrigerant clears Excessive Discharge refrigerant Evacuate A/C system and recharge proper amount of refrigerant 6 Immediately after air conditioning is turned OFF, refrigerant foams and then becomes clear Proper - HINT: *: Bubbles in the sight glass with the vehicle interior above 35°C (95°F) can be considered normal if cooling is sufficient. NG --> CHARGE REFRIGERANT OK: Go to next step
2. READ VALUE USING TECHSTREAM Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Select the item below in the Data List, and read the display on the Techstream. DATA LIST / AIR CONDITIONER Tester Display Measurement Item/Range Normal Condition Diagnostic Note Regulator Pressure Sensor (Reg Press Sens) Refrigerant Pressure Sensor / Min.: -0.45668 MPaG, Max.: 3.29437 MPaG Actual refrigerant pressure is displayed - OK The display is as specified in the normal condition. RESULT Result Proceed to NG A OK (Checking from the PROBLEM SYMPTOMS TABLE) B OK (Checking from the DTC) C C --> REPLACE AIR CONDITIONING AMPLIFIER B --> PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-387145-S36094178262011022400000) A: Go to next step
3. CHECK WIRE HARNESS (PRESSURE SENSOR - A/C AMPLIFIER) Disconnect the B4 pressure sensor connector. Disconnect the K52 A/C amplifier connector. Measure the resistance of the wire harness side connectors. Standard resistance Tester Connection Specified Condition B4-2 (PR) - K52-13 (PRE) Below 1 ohms B4-3 (+) - K52-26 (S5-2) Below 1 ohms B4-1 (-) - K52-38 (SG-2) Below 1 ohms K52-13 (PRE) - Body ground 10 kohms or higher K52-26 (S5-2) - Body ground 10 kohms or higher K52-38 (SG-2) - Body ground 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. CHECK AIR CONDITIONING AMPLIFIER Remove the A/C amplifier with its connectors still connected. Measure the resistance of the connector. Standard resistance Tester Connection Specified Condition K52-38 (SG-2) - Body ground Below 1 ohms Measure the voltage resistance of the connector. Standard voltage Tester Connection Condition Specified Condition K52-26 (S5-2) - K52-38 (SG-2) Power switch ON (IG) 4.5 to 5.5 V Power switch OFF Below 1 V NG --> REPLACE AIR CONDITIONING AMPLIFIER OK: Go to next step
5. CHECK PRESSURE SENSOR Install the manifold gauge set. Connect the three 1.5 V dry cell batteries' positive (+) lead to terminal 3 and the negative (-) lead to terminal 1. Then connect the voltmeter's positive (+) lead to terminal 2 and the negative (-) lead to terminal 1. Measure the voltage. OK The voltage changes according to refrigerant pressure, as shown in the graph. NG --> REPLACE PRESSURE SENSOR OK --> REPLACE AIR CONDITIONING AMPLIFIER

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 current from the solar sensor varies according to the amount of sunlight. When the sunlight increases, the output current increases. As the sunlight decreases, the output current decreases. The A/C amplifier detects output current from the solar sensor.

HINT

If DTC B1244 is output at the same time, troubleshoot DTC B1244 first.

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1. READ VALUE USING TECHSTREAM Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Select the item below in the Data List, and read the display on the Techstream. DATA LIST / AIR CONDITIONER Tester Display Measurement Item/Range Normal Condition Diagnostic Note Solar Sensor (D side) (Solar Sens-D) Driver side solar sensor / Min.: 0, Max.: 255 Driver side solar sensor voltage increases as brightness increases Open in circuit: 0 Short in circuit: 255 OK The display is as specified in the normal condition. RESULT Result Proceed to NG A OK (Checking from the PROBLEM SYMPTOMS TABLE) B OK (Checking from the DTC) C C --> REPLACE AIR CONDITIONING AMPLIFIER B --> PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-387145-S36094178262011022400000) A: Go to next step
2. CHECK WIRE HARNESS (SOLAR SENSOR) Disconnect the L1 solar sensor connector. Measure the resistance of the wire harness side connector. Standard resistance Tester Connection Condition Specified Condition L1-3 (CLTE) - Body ground Always Below 1 ohms Measure the voltage of the wire harness side connector. Standard voltage Tester Connection Condition Specified Condition L1-6 (CLTB) - L1-3 (CLTE) Power switch ON (IG) 10 to 14 V L1-6 (CLTB) - L1-3 (CLTE) Power switch OFF Below 1 V OK --> See step 4 NG: Go to next step
3. CHECK WIRE HARNESS (MAIN BODY ECU RH - SOLAR SENSOR) Disconnect the K67 and DD main body ECU RH connectors. Disconnect the L1 solar sensor connector. Measure the resistance of the wire harness side connectors. Standard resistance Tester Connection Specified Condition K67-6 (CLTB) - L1-6 (CLTB) Below 1 ohms K67-4 (CLTE) - L1-3 (CLTE) Below 1 ohms K67-6 (CLTB) - Body ground 10 kohms or higher K67-4 (CLTE) - Body ground 10 kohms or higher DD-7 (GND2) - Body ground Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> REPLACE MAIN BODY ECU RH
4. CHECK WIRE HARNESS (SOLAR SENSOR - A/C AMPLIFIER) Disconnect the L1 solar sensor connector. Disconnect the K52 A/C amplifier connector. Measure the resistance of the wire harness side connectors. Standard resistance Tester Connection Specified Condition K52-35 (TSD) - L1-1 (TSL) Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
5. CHECK SOLAR SENSOR (TSL VOLTAGE) Remove the solar sensor with its connector still connected. Apply battery voltage between terminals 6 (CLTB) and 3 (CLTE) of the solar sensor. Measure the voltage of the connector. Standard voltage Tester Connection Condition Specified Condition 1 (TSL) - 3 (CLTE) Sensor is subjected to electric light 0.8 to 4.3 V 1 (TSL) - 3 (CLTE) Sensor is covered with a cloth Below 0.8 V HINT: As the inspection light is moved away from the sensor, the voltage decreases. Use an incandescent light for inspection. Bring it about 30 cm (11.8 in.) from the solar sensor. NG --> REPLACE SOLAR SENSOR OK --> REPLACE AIR CONDITIONING AMPLIFIER

The air mix damper servo sends pulse signals to inform the air conditioner amplifier of the damper position. The air conditioner amplifier activates the motor (normal, reverse) based on the signals to move the air mix damper (passenger seat) to any position, which adjusts the amount of air passing the heater core after passing the evaporator to control the blowing temperature.

HINT

Confirm that no mechanical problem is present because this diagnostic code can be output when either a damper link or damper is mechanically locked.

Scheme 187

The damper servo (air inlet control) sends pulse signals to inform the air conditioner amplifier of the damper position. The air conditioner amplifier activates the motor (normal, reverse) based on the signals to move the air inlet mode selection air inlet control damper to any position, which controls the intake air settings (FRESH, FRESH / RECIRCULATION and RECIRCULATION).

HINT

Confirm that no mechanical problem is present because this diagnostic code can be output when either a damper link or damper is mechanically locked.

Scheme 188

The mode damper servo sends pulse signals to inform the air conditioner amplifier of the damper position. The air conditioner amplifier activates the motor (normal, reverse) based on the signals to move the mode damper to any position, which controls the air outlet changes.

HINT

Confirm that no mechanical problem is present because this diagnostic code can be output when either a damper link or damper is mechanically locked.

Scheme 189

The damper servo (cool air bypass) sends pulse signals to inform the air conditioner amplifier of the damper position. The air conditioner amplifier activates the motor (normal, reverse) based on the signals to move the damper to any position. As a result, when the A/C is operating, the temperature of the air blowing toward the passenger's head area is controlled.

HINT

Confirm that no mechanical problem is present because this diagnostic code can be output when either a damper link or damper is mechanically locked.

Scheme 190

The air mix damper servo sends pulse signals to inform the air conditioner amplifier of the damper position. The air conditioner amplifier activates the motor (normal, reverse) based on the signals to move the air mix damper (driver seat) to any position. As a result, the amount of air that has passed through the evaporator and is now passing through the heater core is adjusted, and the temperature of the air blowing toward the driver seat side is controlled.

HINT

Confirm that no mechanical problem is present because this diagnostic code can be output when either a damper link or damper is mechanically locked.

Scheme 191

The exhaust gas sensor detects NOx in the emission gas and transmits signals to the A/C amplifier. Based on the signals, the A/C amplifier automatically changes to FRESH, FRESH / RECIRCULATION, or RECIRCULATION.

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1. INSPECT FUSE (LH-IG) Remove the LH-IG fuse from the main body ECU LH. Measure the resistance of the fuse. Standard resistance Below 1 ohms NG --> CHECK FOR SHORT IN ALL HARNESSES AND COMPONENTS CONNECTED TO FUSE OK: Go to next step
2. READ VALUE USING TECHSTREAM Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Select the item below in the Data List, and read the display on the Techstream. DATA LIST / AIR CONDITIONER Tester Display Measurement Item/Range Normal Condition Diagnostic Note Emission Gas Nox Sensor (Nox Gas Sens) Emission gas NOx sensor / Min.: 0, Max.: 255 Increases as gas amount increases - OK The display is as specified in the normal condition. RESULT Result Proceed to NG A OK (Checking from the PROBLEM SYMPTOMS TABLE) B OK (Checking from the DTC) C C --> REPLACE AIR CONDITIONING AMPLIFIER B --> PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-387145-S36094178262011022400000) A: Go to next step
3. CHECK WIRE HARNESS (EXHAUST GAS SENSOR - BODY GROUND) Disconnect the B10 exhaust gas sensor connector. Measure the resistance of the wire harness side connector. Standard resistance Tester Connection Specified Condition B10-6 (E) - Body ground Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. CHECK WIRE HARNESS (EXHAUST GAS SENSOR - BATTERY) Disconnect the B10 exhaust gas sensor connector. Measure the voltage of the wire harness side connector. Standard voltage Tester Connection Condition Specified Condition B10-3 (IG) - Body ground Power switch ON (IG) 10 to 14 V Power switch OFF Below 1 V NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
5. INSPECT EXHAUST GAS SENSOR Remove the exhaust gas sensor. After applying battery voltage between terminals 3 (IG) and 6 (E) for more than 120 seconds, measure the resistance between terminals 1 (SG) and 4 (DGS1). Measure the resistance of the sensor. Standard resistance Tester Connection Condition Specified Condition B10-1 (SG) - B10-4 (DGS1) 10 to 35°C (50 to 95°F) 1.5 to 240 kohms HINT: When the sensor is exposed to the exhaust gas, the resistance increases. NG --> REPLACE EXHAUST GAS SENSOR OK: Go to next step
6. CHECK WIRE HARNESS (EXHAUST GAS SENSOR - A/C AMPLIFIER) Disconnect the B10 exhaust gas sensor connector. Disconnect the K52 A/C amplifier connector. Measure the resistance of the wire harness side connectors. Standard resistance Tester Connection Specified Condition B10-1 (SG) - K52-39 (SG-6) Below 1 ohms B10-4 (DGS1) - K52-33 (DGS1) Below 1 ohms K52-39 (SG-6) - Body ground 10 kohms or higher K52-33 (DGS1) - Body ground 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> REPLACE AIR CONDITIONING AMPLIFIER

The room humidity sensor detects room humidity. The voltage of the room humidity sensor changes in accordance with room humidity. The A/C amplifier reads changes in the room humidity sensor.

The room humidity sensor is integrated with the room temperature sensor.

Scheme 197

Scheme 198

Scheme 199

1. READ VALUE USING TECHSTREAM Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Select the item below in the Data List, and read the display on the Techstream. DATA LIST / AIR CONDITIONER Tester Display Measurement Item/Range Normal Condition Diagnostic Note Humidity Sensor (Humidity Sens) Humidity Sensor / Min.: 0%, Max.: 100% Actual room humidity is displayed - OK The display is as specified in the normal condition. RESULT Result Proceed to NG A OK (Checking from the PROBLEM SYMPTOMS TABLE) B OK (Checking from the DTC) C C --> REPLACE AIR CONDITIONING AMPLIFIER B --> PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-387145-S36094178262011022400000) A: Go to next step
2. CHECK WIRE HARNESS (ROOM TEMPERATURE SENSOR - A/C AMPLIFIER) Disconnect the K33 room temperature sensor connector. Disconnect the K52 A/C amplifier connector. Measure the resistance of the wire harness side connectors. Standard resistance Tester Connection Specified Condition K33-3 (RH) - K52-15 (RH) Below 1 ohms K33-4 (S5) - K52-7 (S5-1) Below 1 ohms K33-2 (-) - K52-19 (SG-1) Below 1 ohms K52-19 (SG-1) - Body ground 10 kohms or higher K52-15 (RH) - Body ground Below 1 ohms K52-7 (S5-1) - Body ground 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
3. CHECK AIR CONDITIONING AMPLIFIER (S5-1 - SG-1 VOLTAGE) Remove the A/C amplifier with its connectors still connected. Measure the voltage of the connector. Standard voltage Tester Connection Humidity Condition Specified Condition K52-7 (S5-1) - K52-19 (SG-1) Power switch ON (IG) 4.5 to 5.5 V K52-7 (S5-1) - K52-19 (SG-1) Power switch OFF Below 1 V NG --> REPLACE AIR CONDITIONING AMPLIFIER OK: Go to next step
4. INSPECT ROOM TEMPERATURE SENSOR (ROOM HUMIDITY SENSOR) Remove the room temperature sensor. Measure the voltage of the sensor. Standard voltage Tester Connection Humidity Condition Specified Condition 2 (-) - 3 (RH) 10% 0.70 to 1.08 V 2 (-) - 3 (RH) 20% 0.72 to 1.57 V 2 (-) - 3 (RH) 30% 1.13 to 1.95 V 2 (-) - 3 (RH) 40% 1.61 to 2.24 V 2 (-) - 3 (RH) 50% 1.99 to 2.46 V 2 (-) - 3 (RH) 60% 2.26 to 2.66 V 2 (-) - 3 (RH) 70% 2.48 to 2.85 V 2 (-) - 3 (RH) 80% 2.68 to 3.04 V 2 (-) - 3 (RH) 90% 2.87 to 3.05 V NOTE: Do not touch the humidity sensor as body heat will affect the inspection results. When performing the inspection, hold the sensor by its connector. Allow the sensor to acclimate to the ambient temperature and humidity before performing the inspection. The standard voltages in the table above are based on inspections performed when the ambient temperature is 25°C (77°F). NG --> REPLACE ROOM TEMPERATURE SENSOR OK --> REPLACE AIR CONDITIONING AMPLIFIER

The A/C inverter assembly monitors power voltage from the main battery in the circuit. It stops compressor control and outputs the DTC when the monitored voltage is outside the specified range.

The output DTC is memorized as previous trouble. Compressor control may not resume unless the power switch is turned OFF.

Note. The hybrid control system and air conditioning system output DTCs separately. If these systems output DTCs simultaneously, inspect the DTCs of the hybrid control system first by following the flowchart. This circuit uses both CAN and multiplex communication. Before performing the inspection, check that the CAN and multiplex communication systems are functioning normally.

Scheme 200

Scheme 201

Scheme 202

1. CHECK FOR DTC Check if DTCs for the hybrid control system are output using the Techstream. OK DTCs are not output in the hybrid control system. NG --> GO TO THE APPROPRIATE HYBRID CONTROL SERVICE INFORMATION OK: Go to next step
2. INSPECT ELECTRIC VEHICLE FUSE (COMP) Turn the power switch OFF. Remove the service plug grip. WARNING: Be sure to wear insulated gloves. Do not touch the high-voltage connectors or terminals for 10 minutes after the service plug grip is removed. NOTE: Do not start the engine with the service plug grip removed because it may cause a malfunction. Remove the inverter cover. NOTE: Tape the interlock round terminal of the inverter cover to prevent it from being grounded. Be sure to prevent foreign objects or water from entering the inverter assembly. Check that the A and B bolts are tightened securely. Measure the resistance of the fuse. Standard resistance Below 1 ohms NG --> REPLACE FUSE OK: Go to next step
3. INSPECT AIR CONDITIONING HARNESS Disconnect the w8 and w9 air conditioning harness connectors. WARNING: Be sure to wear insulated gloves. Measure the resistance of the air conditioning harness. Standard resistance Tester Connection Specified Condition w8-2 (PB) - w9-1 (ACPB) Below 1 ohms w8-1 (PE) - w9-2 (ACPE) Below 1 ohms w8-2 (PB) - Body ground 10 kohms or higher NG --> REPAIR OR REPLACE AIR CONDITIONING HARNESS OK --> REPLACE COMPRESSOR ASSEMBLY

The inverter in the compressor assembly outputs high-voltage to operate the motor. If there is an open or short in the output circuit, the ECU will stop compressor operation and output the DTC. The output DTC will be memorized as a past DTC. The compressor operation remains stopped until both the past and present DTCs are cleared. When a DTC is output even once, replace the compressor assembly.

Note. This circuit uses both CAN and multiplex communication. Before performing the inspection, check that the CAN and multiplex communication systems are functioning normally.

The inverter activation signal is sent to the compressor assembly from the hybrid vehicle control ECU. Compressor control is stopped and the DTC is output if there is an open or short in the signal circuit.

Note. This circuit uses both CAN and multiplex communication. Before performing the inspection, check that the CAN and multiplex communication systems are functioning normally.

Scheme 203

Scheme 204

1. CHECK FOR DTC Clear the DTC. Refer to «DTC CHECK / CLEAR»(ref-387145-S20183754872011022400000) . Check if DTCs for the air conditioning system and the hybrid control system are output using the Techstream. RESULT Result Proceed to Only DTC B1473 is output A DTC B1473 and P3108 are output simultaneously (B1498 is not output) DTC B1473 and B1498 are output simultaneously (P3108 is not output) B. Refer to «DTC B1498/98: Communication Malfunction (A/C Inverter Local)»(ref-387146-S09432971602011022400000) DTC B1473, B1498 and P3108 are output simultaneously DTC other than P3108 is output for hybrid control system C. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-387110-S38353956282011022400000) C --> See step 7 B --> See step 6 A: Go to next step
2. CHECK WIRE HARNESS (HYBRID VEHICLE CONTROL ECU - COMPRESSOR) Disconnect the E84 hybrid vehicle control ECU connector. WARNING: Do not disconnect the connector on the high-voltage side. Disconnect the E85 compressor connector. Measure the resistance of the wire harness side connectors. Standard resistance Tester Connection Specified Condition E84-8 (STB) - E85-4 (STBI) Below 1 ohms E84-8 (STB) - Body ground 10 kohms or higher E85-4 (STBI) - Body ground 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
3. INSPECT COMPRESSOR ASSEMBLY Reconnect the E85 compressor connector. Disconnect the E84 hybrid vehicle control ECU. Measure the voltage of the hybrid vehicle control ECU. Standard voltage Tester Connection Condition Specified Condition E84-8 (STB) - Body ground Power switch ON (IG) 10 to 14 V E84-8 (STB) - Body ground Power switch OFF Below 1 V OK --> REPLACE HYBRID VEHICLE CONTROL ECU NG: Go to next step
4. REPLACE COMPRESSOR ASSEMBLY NEXT: Go to next step
5. CHECK FOR DTC Clear the DTC. Refer to «DTC CHECK / CLEAR»(ref-387145-S20183754872011022400000) . Check for the DTC again. Refer to «DTC CHECK / CLEAR»(ref-387145-S20183754872011022400000) . RESULT Result Proceed to DTC B1473 is output A DTC B1473 is not output B B --> END A --> REPLACE HYBRID VEHICLE CONTROL ECU
6. GO TO DTC B1498. Refer to «DTC B1498/98: Communication Malfunction (A/C Inverter Local)»(ref-387146-S09432971602011022400000)
7. GO TO HYBRID CONTROL SYSTEM. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-387110-S38353956282011022400000)

When a DTC is output even once, replace the compressor assembly.

Note. This circuit uses both CAN and multiplex communication. Before performing the inspection, check that the CAN and multiplex communication systems are functioning normally.

The temperature sensor of the compressor assembly detects the inverter temperature.

If the temperature exceeds the maximum, the compressor assembly stops compressor operation, and DTC will be output.

Note. This circuit uses both CAN and multiplex communication. Before performing the inspection, check that the CAN and multiplex communication systems are functioning normally.

The compressor assembly stops compressor control and outputs DTC if the rotation load is too great or too small while controlling motor rotation in the compressor assembly.

Possible causes are refrigerant gas leakage, overcharged refrigerant gas, insufficient cooling because of a condenser fan circuit malfunction, or compressor lock.

Note. This circuit uses both CAN and multiplex communication. Before performing the inspection, check that the CAN and multiplex communication systems are functioning normally.

The compressor assembly monitors the controlling power voltage in the circuit. It stops the compressor circuit and outputs the DTC when the monitored voltage is outside the specified range.

The output DTC is memorized as previous trouble. The compressor control may not resume unless the power switch is turned OFF. When a DTC is output even once, replace the compressor assembly.

Note. This circuit uses both CAN and multiplex communication. Before performing the inspection, check that the CAN and multiplex communication systems are functioning normally.

The air conditioning harness connects the air conditioning amplifier and each servo. The air conditioning amplifier supplies power and sends operation instructions to each servo through the air conditioning harness. Each servo sends the damper position information to the air conditioning amplifier.

Scheme 205

Scheme 206

Scheme 207

Scheme 208

1. CHECK WIRE HARNESS (AIR CONDITIONING AMPLIFIER - BODY GROUND) Disconnect the K52 A/C amplifier connector. Measure the resistance of the wire harness side connector. Standard resistance Tester Connection Specified Condition K52-20 (GND) - Body ground Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
2. CHECK AIR CONDITIONING AMPLIFIER Reconnect the K52 A/C amplifier connector. Remove the air conditioning amplifier with its connectors still connected. Measure the resistance of the connectors. Standard resistance Tester Connection Specified Condition K52-20 (GND) - z1-2 (BUSG) Below 1 ohms z1-2 (BUSG) - Body ground Below 1 ohms NG --> REPLACE AIR CONDITIONING AMPLIFIER OK: Go to next step
3. CHECK AIR CONDITIONING AMPLIFIER Remove the air conditioning amplifier with its connectors still connected. Measure the voltage of the connector. Standard voltage Tester Connection Condition Specified Condition z1-2 (BUSG) - z1-4 (BBUS) Power switch ON (IG) 10 to 14 V Power switch OFF Below 1 V z1-2 (BUSG) - z1-3 (BUS) Power switch ON (IG) Pulse generation NG --> REPLACE AIR CONDITIONING AMPLIFIER OK --> REPLACE AIR CONDITIONING HARNESS

The hybrid vehicle control ECU and compressor transmit information to one another via the CAN and multiplex communication lines. Compressor control is stopped and the DTC is output if communication information is cut off or abnormal information occurs.

The DTC is also detected if high-voltage power supplied from the inverter assembly to the compressor control circuit is shut off.

The output DTC is memorized as previous trouble.

Note. This circuit uses both CAN and multiplex communication. Before performing the inspection, check that the CAN and multiplex communication systems are functioning normally. If abnormal information occurs as a result of the timing of the power switch and the high-voltage power supply, this DTC may be output. If the DTC is a past trouble, check the fuse and the wire harness. If there is no malfunction, erase the DTC.

Scheme 209

Scheme 210

Scheme 211

Scheme 212

Scheme 213

Scheme 214

1. CHECK FOR DTC Check if DTCs for the hybrid control system are output using the Techstream. RESULT Result Proceed to DTC is not output A DTC P3108 is output A Except DTC P3108 is output B. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(ref-387110-S29587686272011022400000) B --> See step 11 A: Go to next step
2. INSPECT FUSE (A/C W/P) Remove the A/C W/P fuse from the main body ECU LH. Measure the resistance of the fuse. Standard resistance Below 1 ohms NG --> REPLACE FUSE OK: Go to next step
3. CHECK WIRE HARNESS (COMPRESSOR - BODY GROUND) Disconnect the E85 compressor connector. WARNING: Do not disconnect the connector on the high-voltage side. Measure the resistance of the wire harness side connector. Standard resistance Tester Connection Specified Condition E85-5 (GND) - Body ground Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. CHECK WIRE HARNESS (COMPRESSOR - BATTERY AND BODY GROUND) Disconnect the E85 compressor connector. Measure the voltage of the wire harness side connector. Standard voltage Tester Connection Condition Specified Condition E85-6 (IG1) - E85-5 (GND) Power switch ON (IG) 10 to 14 V E85-6 (IG1) - E85-5 (GND) Power switch OFF Below 1 V NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
5. CHECK WIRE HARNESS (HYBRID VEHICLE CONTROL ECU - COMPRESSOR) Disconnect the E84 hybrid vehicle control ECU connector. Disconnect the E85 compressor connector. Measure the resistance of the wire harness side connectors. Standard resistance Tester Connection Specified Condition E85-1 (CLK) - E84-9 (CLK) Below 1 ohms E85-2 (DIM) - E84-10 (ITE) Below 1 ohms E85-3 (DOUT) - E84-11 (ETI) Below 1 ohms E85-1 (CLK) - Body ground 10 kohms or higher E85-2 (DIM) - Body ground 10 kohms or higher E85-3 (DOUT) - Body ground 10 kohms or higher E84-9 (CLK) - Body ground 10 kohms or higher E84-10 (ITE) - Body ground 10 kohms or higher E84-11 (ETI) - Body ground 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
6. INSPECT ELECTRIC VEHICLE FUSE (COMP) Turn the power switch OFF. Remove the service plug grip. WARNING: Be sure to wear insulated gloves. Do not touch the high-voltage connectors or terminals for 10 minutes after the service plug grip is removed. NOTE: Do not start the engine with the service plug grip removed because it may cause a malfunction. Remove the inverter cover. NOTE: Tape the interlock round terminal of the inverter cover to prevent it from being grounded. Be sure to prevent foreign objects or water from entering the inverter assembly. Check that the A and B bolts are tightened securely. Measure the resistance of the fuse. Standard resistance Below 1 ohms NG --> REPLACE FUSE OK: Go to next step
7. INSPECT AIR CONDITIONING HARNESS Disconnect the w8 and w9 air conditioning harness connectors. WARNING: Be sure to wear insulated gloves. Measure the resistance of the air conditioning harness. Standard resistance Tester Connection Specified Condition w8-2 (PB) - w9-1 (ACPB) Below 1 ohms w8-1 (PE) - w9-2 (ACPE) Below 1 ohms w8-2 (PB) - Body ground 10 kohms or higher NG --> REPAIR OR REPLACE AIR CONDITIONING HARNESS OK: Go to next step
8. CHECK COMPRESSOR ASSEMBLY Reconnect the w8 and w9 air conditioning harness connectors. Disconnect the E84 hybrid vehicle control ECU connector. Reconnect the E85 compressor connector. Using an oscilloscope, check the waveform 1. WAVEFORM 1 (REFERENCE): Item Contents Test Connector CLK (E84-9) - Body ground Tool Setting 5 V/DIV., 200 msec./DIV. Vehicle Condition Power switch: ON (IG) OK Waveform appears. HINT: Waveform cycle varies with the communication contents. Using an oscilloscope, check the waveform 2. WAVEFORM 1 (REFERENCE): Item Contents Test Connector ITE (E84-10) - Body ground Tool Setting 5 V/DIV., 200 msec./DIV. Vehicle Condition Power switch: ON (IG) OK Waveform appears. HINT: Waveform cycle varies with the communication contents. OK --> REPLACE HYBRID VEHICLE CONTROL ECU NG: Go to next step
9. REPLACE COMPRESSOR ASSEMBLY NEXT: Go to next step
10. CHECK FOR DTC Clear the DTC. Refer to «DTC CHECK / CLEAR»(ref-387145-S20183754872011022400000) . Check for the DTC again. Refer to «DTC CHECK / CLEAR»(ref-387145-S20183754872011022400000) . RESULT Result Proceed to DTC B1498 is output A DTC B1498 is not output B B --> END A --> REPLACE HYBRID VEHICLE CONTROL ECU
11. GO TO HYBRID CONTROL SYSTEM. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(ref-387110-S29587686272011022400000)

The air conditioning amplifier communicates data with the ECM and combination meter through the multiplex communication system.

Scheme 215

The DTC is output if there is insulation trouble with the high-voltage circuits in the air conditioning system. Possible causes are poor insulation in the compressor assembly, or mixing of any oil other than ND-OIL 11 in the refrigerant cycle.

The motor driven with high-voltage is built into the electrical compressor and is cooled directly with refrigerant. Compressor oil (ND-OIL 11) with high insulation performance is used because a leakage of electrical power may occur if regular compressor oil (ND-OIL 8) is used.

Note. Electrical insulation performance may decrease significantly if even a small amount of oil other than ND-OIL 11 is used (or enters) in the refrigerant cycle, causing the DTC to be output. Replace the air conditioning cycle* if a large amount of oil other than ND-OIL 11 enters the system. Failing to do so may cause electrical insulation performance to remain low, causing the DTC to be output. *: The refrigerant components of the air conditioning system (Evaporator, condenser, compressor assembly, refrigerant pipe line)

HINT

This circuit uses both CAN and multiplex communication. Before performing the inspection, check that the CAN and multiplex communication systems are functioning normally.

The heater water pump assembly sends engine coolant to the heater core assembly while the engine is stopped to prevent heater effectiveness from becoming low. Directed by the air conditioning amplifier assembly, hybrid vehicle control ECU operates the water pump relay and drives the heater water pump assembly.

Scheme 216

Scheme 217

Scheme 218

Scheme 219

Scheme 220

Scheme 221

Scheme 222

1. PERFORM ACTIVE TEST USING TECHSTREAM Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Select the item below in the Active Test and then check that the relay operates. ACTIVE TEST / AIR CONDITIONER Tester Display Test Part Control Range Diagnostic Note Water Pump (Water Pump Rly) Water pump OFF, ON - OK Heater water pump operates smoothly. RESULT NG A OK (Checking from the PROBLEM SYMPTOMS TABLE) B OK (Checking from the DTC) C C --> REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY B --> PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-387145-S36094178262011022400000) A: Go to next step
2. INSPECT FUSE (A/C W/P) Remove the A/C W/P fuse from the main body ECU LH. Measure the resistance of the fuse. Standard resistance Below 1 ohms NG --> REPLACE FUSE OK: Go to next step
3. INSPECT AIR CONDITIONING WATER PUMP RELAY (Marking: A/C W/P) Remove the water pump relay from the engine room No. 1 relay block. NOTE: As the water pump relay is connected to the relays and fuses in the other systems, remove it with the power switch OFF. (A DTC may be output if the power switch is ON (IG).) Measure the resistance of the relay. Standard resistance Tester Connection Specified Condition 1 - 2 Below 1 ohms 3 - 5 10 kohms or higher 3 - 5 Below 1 ohms (when battery voltage is applied to terminals 1 and 2) NG --> REPLACE WATER PUMP RELAY OK: Go to next step
4. CHECK WIRE HARNESS (HYBRID VEHICLE CONTROL ECU - BATTERY) Install the water pump relay. Disconnect the A54 hybrid vehicle control ECU connector. Measure the voltage of the wire harness side connector. Standard voltage Tester Connection Condition Specified Condition A54-109 (WP) -Body ground Power switch ON (IG) 10 to 14 V A54-109 (WP) -Body ground Power switch OFF Below 1 V NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
5. CHECK WIRE HARNESS (A/C W/P FUSE - AIR CONDITIONING WATER PUMP RELAY) Remove the water pump relay from the engine room No. 1 relay block. Measure the voltage of the air conditioning water pump connector. Standard voltage Tester Connection Condition Specified Condition A/C W/P relay terminal 3 - Body ground Power switch ON (IG) 10 to 14 V NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
6. CHECK WIRE HARNESS (HEATER WATER PUMP - BODY GROUND) Disconnect the A56 heater water pump connector. Measure the resistance of the wire harness side connector. Standard resistance Tester Connection Specified Condition A56-1 (-) - Body ground Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
7. CHECK WIRE HARNESS (AIR CONDITIONING WATER PUMP RELAY - HEATER WATER PUMP) Remove the water pump relay from the engine room No. 1 relay block. Disconnect the A56 heater water pump connector. Measure the resistance of the wire harness side connector. Standard resistance Tester Connection Specified Condition A/C W/P relay terminal 5 - A56-2 (+B) Below 1 ohms A/C W/P relay terminal 5 - Body ground 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
8. INSPECT HEATER WATER PUMP ASSEMBLY Remove the heater water pump. Connect the battery's positive (+) lead to terminal 2 (+B) and negative (-) to terminal 1 (-) of the heater water pump connector. OK Heater water pump operates smoothly. NOTE: Complete operation within 10 seconds if there is no water in the heater water pump assembly. NG --> REPLACE HEATER WATER PUMP ASSEMBLY OK --> REPLACE HYBRID VEHICLE CONTROL ECU

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

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

Scheme 223

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

Scheme 224

Scheme 225

1. INSPECT FUSE (A/C) Remove the A/C fuse from the main body ECU LH. Measure the resistance of the fuse. Standard resistance Below 1 ohms NG --> CHECK FOR SHORT IN ALL HARNESSES AND COMPONENTS CONNECTED TO FUSE OK: Go to next step
2. CHECK WIRE HARNESS (AIR CONDITIONING AMPLIFIER - BATTERY) Disconnect the K52 A/C amplifier connector. Measure the voltage of the wire harness side connector. Standard voltage Tester Connection Specified Condition K52-1 (B) - Body ground 10 to 14 V NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-387145-S36094178262011022400000)

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