Air Conditioning: Overview Lexus LS IV

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1. NOTICE FOR INITIALIZATION NOTE: When disconnecting the cable from the negative (-) battery terminal, initialize the following systems after the cable is reconnected. SYSTEM PROCEDURE CHART System Name See procedure Navigation System (for DVD) «INITIALIZATION» Advanced Parking Guidance System Power Trunk Lid System Rear Door Sunshade System
2. NOTICE FOR RESETTING NOTE: When disconnecting the cable from the negative (-) battery terminal of the vehicle with the rear cooler unit, change the air outlet mode position for the rear LH and RH seats to "FOOT".
3. PRECAUTIONS WHEN USING TECHSTREAM When using the Techstream to troubleshoot the LIN communication line: Connect the Techstream to the vehicle, and turn a courtesy light switch on and off at 1.5 second intervals until communication between the Techstream and vehicle begins. After all DTCs are cleared, check if the trouble occurs again 6 seconds after the engine switch is turned on (IG).
4. IF ANY OF FOLLOWING CONDITIONS ARE MET, KEEP ENGINE IDLING WITH A/C ON (ENGINE SPEED AT LESS THAN 2000 RPM) FOR AT LEAST 1 MINUTE: Refrigerant gas has been refilled or A/C parts have been replaced. A long time has elapsed since the engine was stopped. NOTE: If the engine speed exceeds 2000 rpm, the A/C compressor may be damaged.
5. DO NOT HANDLE REFRIGERANT IN ENCLOSED AREAS OR NEAR OPEN FLAMES
6. ALWAYS WEAR EYE PROTECTION
7. BE CAREFUL NOT TO GET LIQUID REFRIGERANT IN YOUR EYES OR ON YOUR SKIN If liquid refrigerant gets in your eyes or on your skin: Wash the area with lots of cold water. CAUTION: Do not rub your eyes or skin. Apply clean petroleum jelly to the skin. Go immediately to a physician or hospital for professional treatment.
8. NEVER HEAT CONTAINER OR EXPOSE IT TO OPEN FLAME
9. BE CAREFUL NOT TO DROP CONTAINER OR SUBJECT IT TO PHYSICAL SHOCKS
10. DO NOT OPERATE COMPRESSOR WITH INSUFFICIENT REFRIGERANT IN REFRIGERANT SYSTEM If there is not enough refrigerant in the refrigerant system, oil lubrication will be insufficient and compressor burnout may occur. Necessary care should be taken to avoid this.
11. DO NOT OPEN HIGH PRESSURE MANIFOLD VALVE WHILE COMPRESSOR IS OPERATING Open and dose only the low pressure valve. Opening and closing the high pressure valve could cause the charging cylinder to rupture.
12. BE CAREFUL NOT TO OVERCHARGE SYSTEM WITH REFRIGERANT If the refrigerant is overcharged, it causes problems such as insufficient cooling, poor fuel economy and engine overheating.
13. DO NOT OPERATE ENGINE AND COMPRESSOR WITHOUT REFRIGERANT NOTE: This may damage the inside of the compressor.

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Communication table

COMMUNICATION CHART

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1. GENERAL The air conditioning system has the following features: The optional multi-zone automatic climate control system (controlled by the neural network) is available on this vehicle. When the 4-ZONE switch is ON, the temperature, airflow mode and airflow volume of each of the 4 seats (driver, front passenger, rear left, rear right) is automatically adjusted. As a standard, the front seat independent temperature climate control system (controlled by the neural network) is in this vehicle. A non-sliding type film damper is used to provide independent airflow volume for the right and left side of the vehicle. The multi-zone automatic climate control system has a 4-ZONE switch, and the front seat independent temperature climate control system has a DUAL switch. The registers on the center pillars help improve airflow to the rear seats. For vehicles with the rear cooler, there are roof and roof side air ducts, and independent temperature and airflow mode adjustments are automatically performed. The rear cooler unit has a rear seat independent temperature climate control system, an odor filter for the air purification function, and a cool box. For the long body VIP specification, an infrared ray sensor unit is installed. The infrared ray sensor unit detects the body temperature of the rear seat passenger, compares the body temperature to a specified setting, and attempts to decrease the temperature difference. The Positive Temperature Coefficient (PTC) heater system contains a PTC heater that heats the air that has passed through the heater core to ensure the proper heater performance. A compact, lightweight, and highly efficient straight flow (full-path flow) aluminum heater core is used. The micro dust and pollen filter control is used to remove pollen in the area around the upper areas of the driver and front passenger seats. The air conditioning amplifier is equipped with a self diagnosis function. If there is a malfunction in the system, it stores the DTCs (Diagnostic Trouble Codes) in its memory.
2. MODE POSITION AND DAMPER OPERATION MODE POSITION AND DAMPER OPERATION CHART Control Damper Control Position Damper Position Operation Air Inlet Control Damper FRESH A Brings in fresh air. RECIRC B Recirculates internal air. Air Mix Control Film Damper MAX COOL to MAX HOT J, K Varies mixture ratio of fresh air and recirculation air in order to regulate temperature continuously from HOT to COOL. Cool Air Bypass Control Damper MAX COOL to MAX HOT H, I Cool air blows out of front center register and side registers, in order to adjust temperature around head of occupants during cooling or warming. Mode Control Damper FACE G Air blows out of front and rear center registers, center pillar register, and side register. BI - LEVEL F Air blows out of front and rear center registers, side register, center pillar register and front and rear footwell register ducts. FOOT E Air blows out of front and rear footwell register ducts, and side register. In addition, air blows out slightly from center and side defrosters. FOOT/DEF D Air blows out of center defroster, side defroster, side register, and rear center register to defrost windshield. Air also blows out from front and rear footwell register ducts. DEF C Air blows out of center and side defrosters and side registers to defrost windshield. MODE POSITION AND DAMPER OPERATION CHART Control Damper Control Position Damper Position Operation Air Inlet/Outlet Control Damper & Exhaust Control Damper Air Purifier ON (FRESH Mode) A, C, F, H, J Cleaned air is discharged from air vent in luggage compartment. Air Purifier ON (RECIRC Mode) A, D, F, H, J Cleaned air blows out of diffusion register duct. Rear Cooler ON B, E, G, I Air blows out of roof side register and roof register.
3. AIR OUTLETS AND AIRFLOW VOLUME HINT: The size of the circle indicates the proportion of airflow volume. FACE U: Air flows from registers only FACE L: Air flows from registers and footwells B/L U: Standard B/L mode B/L L: B/L mode in which large amount of air flows from footwells FOOT (DEF=0): FOOT mode where no air flows from defroster FOOT D: FOOT mode in which large amount of air flows from defroster FOOT R: FOOT mode in which large amount of air flows from rear footwells FOOT F: Standard FOOT mode F/D: Standard FOOT/DEF mode DEF: Standard DEF mode HINT: The size of the circle indicates the proportion of airflow volume.

DESCRIPTION

The room temperature sensor for the front seat 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 air conditioning 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 air conditioning amplifier.

DTC DETECTION CONDITION CHART

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1. READ VALUE USING TECHSTREAM (ROOM TEMPERATURE SENSOR) Use the Data List to check if the room temperature sensor is functioning properly. Air Conditioner AIR CONDITIONER REFERENCE CHART Tester Display Measurement Item/Range Normal Condition Diagnostic Note Room Temperature Sensor Room temperature sensor / Min.: -6.5°C (20.3°F) Max.: 57.25°C (135.05°F) Actual room temperature for front seat is displayed Open in circuit: -6.5°C (20.3°F) Short in circuit: 57.25°C (135.05°F) Result RESULT CHART Result Proceed to NG A OK (Checking from the PROBLEM SYMPTOMS TABLE) B OK (Checking from the DTC) C B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (See «PROBLEM SYMPTOMS TABLE» ) C: REPLACE AIR CONDITIONING AMPLIFIER (See «REMOVAL» ) A: Go to Next Step
2. INSPECT ROOM TEMPERATURE SENSOR Remove the room temperature sensor (see «REMOVAL» ). Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE REFERENCE CHART 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 below). NG: REPLACE ROOM TEMPERATURE SENSOR (See «REMOVAL» ) OK: Go to Next Step
3. CHECK HARNESS AND CONNECTOR (ROOM TEMPERATURE - AIR CONDITIONING AMPLIFIER) Disconnect the L37 room temperature sensor connector. Disconnect the L77 air conditioning amplifier connector. Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE REFERENCE CHART Tester Connection Condition Specified Condition L37-2 - L77-9 (TR) Always Below 1 ohms L37-1 -L77-32 (SG-1) Always Below 1 ohms L77-9 (TR) - Body ground Always 10 kohms or higher L77-32 (SG-1) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE AIR CONDITIONING AMPLIFIER (See «REMOVAL» )

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 front light ECU (front controller) detects fluctuations in the ambient temperature. This data is used for controlling the room temperature. The sensor sends a signal to the air conditioning amplifier via the front light ECU (front controller). 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 front light ECU (front controller) applies voltage (5 V) to the ambient temperature sensor and reads voltage changes as the resistance of the ambient temperature sensor changes. The front light ECU (front controller) sends the read signal to the air conditioning amplifier via the CAN communication line.

HINT

This circuit uses the CAN communication line. Before performing the inspection, check that the CAN communication system is functioning normally.

DTC DETECTION CONDITION CHART

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1. READ VALUE USING TECHSTREAM (AMBIENT TEMPERATURE SENSOR) Use the Data List to check if the ambient temperature sensor is functioning properly. Air Conditioner AIR CONDITIONER REFERENCE CHART Tester Display Measurement Item/Range Normal Condition Diagnostic Note Ambient 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 CHART Result Proceed to NG A OK (Checking from the PROBLEM SYMPTOMS TABLE) B OK (Checking from the DTC) C B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (See «PROBLEM SYMPTOMS TABLE» ) C: REPLACE AIR CONDITIONING AMPLIFIER (See «REMOVAL» ) A: Go to Next Step
2. INSPECT AMBIENT TEMPERATURE SENSOR Remove the ambient temperature sensor (see «AMBIENT TEMPERATURE SENSOR» ). Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE REFERENCE CHART 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 below NG: REPLACE AMBIENT TEMPERATURE SENSOR (See «AMBIENT TEMPERATURE SENSOR» ) OK: Go to Next Step
3. CHECK HARNESS AND CONNECTOR (AMBIENT TEMPERATURE SENSOR - FRONT LIGHT ECU) Disconnect the B5 ambient temperature sensor connector. Disconnect the B14 front light ECU connector. Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE REFERENCE CHART Tester Connection Condition Specified Condition B5-1 - B14-20 (TM) Always Below 1 ohms B5-2 - B14-19 (TME) Always Below 1 ohms B14-20 (TM) - Body ground Always 10 kohms or higher B14-19 (TME) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE FRONT LIGHT ECU

The No. 1 cooler thermistor (evaporator temperature sensor) 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 air conditioning amplifier. The resistance of the No. 1 cooler thermistor (evaporator temperature sensor) 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 air conditioning amplifier applies voltage (5 V) to the No. 1 cooler thermistor (evaporator temperature sensor) and reads voltage changes as the resistance of the No. 1 cooler thermistor (evaporator temperature sensor) changes. This sensor is used for frost prevention.

DTC DETECTION CONDITION CHART

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1. READ VALUE USING TECHSTREAM (EVAPORATOR FIN THERMISTOR) Use the Data List to check if the evaporator fin thermistor is functioning properly. Air Conditioner AIR CONDITIONER REFERENCE CHART Tester Display Measurement Item/Range Normal Condition Diagnostic Note Evaporator Fin Thermistor Evaporator fin thermistor / 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 CHART Result Proceed to NG A OK (Checking from the PROBLEM SYMPTOMS TABLE) B OK (Checking from the DTC) C B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (See «PROBLEM SYMPTOMS TABLE» ) C: REPLACE AIR CONDITIONING AMPLIFIER (See «REMOVAL» ) A: Go to Next Step
2. INSPECT NO. 1 COOLER THERMISTOR (EVAPORATOR TEMPERATURE SENSOR) Remove the No. 1 cooler thermistor (evaporator temperature sensor) connector (see «DISASSEMBLY» ). Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE REFERENCE CHART Tester Connection Condition Specified Condition 1 - 2 -10°C (14°F) 7.30 to 9.10 kohms 1 - 2 -5°C (23°F) 5.65 to 6.95 kohms 1 - 2 0°C (32°F) 4.40 to 5.35 kohms 1 - 2 5°C (41°F) 3.40 to 4.15 kohms 1 - 2 10°C (50°F) 2.70 to 3.25 kohms 1 - 2 15°C (59°F) 2.14 to 2.58 kohms 1 - 2 20°C (68°F) 1.71 to 2.05 kohms 1 - 2 25°C (77°F) 1.38 to 1.64 kohms 1 - 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 below). NG: REPLACE NO. 1 COOLER THERMISTOR (See «DISASSEMBLY» ) OK: REPLACE AIR CONDITIONING HARNESS (See «DISASSEMBLY» )

The air duct sensor (for driver side) detects the register temperature and sends the appropriate signals to the air conditioning amplifier.

DTC DETECTION CONDITION CHART

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1. READ VALUE USING TECHSTREAM (DUCT SENSOR (for Driver Side)) Use the Data List to check if the duct sensor (for driver side) is functioning properly. Air Conditioner AIR CONDITIONER REFERENCE CHART Tester Display Measure Item/Range Normal Condition Diagnostic Note Duct Sensor (D Side) Duct sensor (for driver side) / Min.: -12.7°C (9.14°F) Max.: 76.55°C (169.79°F) Actual duct temperature is displayed (for driver side) - OK: The display is as specified in the normal condition. Result RESULT CHART Result Proceed to NG A OK (Checking from the PROBLEM SYMPTOMS TABLE) B OK (Checking from the DTC) C B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (See «PROBLEM SYMPTOMS TABLE» ) C: REPLACE AIR CONDITIONING AMPLIFIER (See «REMOVAL» ) A: Go to Next Step
2. CHECK AIR CONDITIONING AMPLIFIER (TFAL - SG-2 VOLTAGE) Remove the air conditioning amplifier with its connectors still connected (see «REMOVAL» ). Turn the engine switch on (IG). Measure the voltage according to the value(s) in the table below. Standard voltage VOLTAGE REFERENCE CHART Tester Connection Switch Condition Specified Condition L77-21 (TFAL) - L77-12 (S6-2) Engine switch on (IG) at 25°C (77°F) 1.8 to 2.2 V Engine switch on (IG) at 50°C (122°F) 0.8 to 1.2 V HINT: As the temperature increases, the voltage decreases. Result RESULT CHART Result Proceed to NG A OK (Checking from the PROBLEM SYMPTOMS TABLE) B OK (Checking from the DTC) C B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (See «PROBLEM SYMPTOMS TABLE» ) C: REPLACE AIR CONDITIONING AMPLIFIER (See «REMOVAL» ) A: Go to Next Step
3. CHECK AIR DUCT SENSOR Remove the air duct sensor (see «REMOVAL» ). Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE REFERENCE CHART Tester Connection Condition Specified Condition 1 - 2 0°C (32°F) 14.5 to 19.0 kohms 25°C (77°F) 4.8 to 5.2 kohms 50°C (122°F) 1.6 to 2.0 kohms HINT: As the temperature increases, the resistance decreases. NG: REPLACE AIR DUCT SENSOR (See «REMOVAL» ) OK: Go to Next Step
4. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - AIR DUCT SENSOR) Disconnect the L14 air duct sensor connector. Disconnect the L77 air conditioning amplifier connector. Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE REFERENCE CHART Tester Connection Condition Specified Condition L77-21 (TFAL) - L14-1 Always Below 1 ohms L77-12 (SG-2) - L14-2 Always Below 1 ohms L77-21 (TFAL) - Body ground Always 10 kohms or higher L77-12 (SG-2) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE AIR CONDITIONING AMPLIFIER (See «REMOVAL» )

The air duct sensor (for passenger side) detects the register temperature and sends the appropriate signals to the air conditioning amplifier.

DTC DETECTION CONDITION CHART

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1. READ VALUE USING TECHSTREAM (DUCT SENSOR (for Passenger Side)) Use the Data List to check if the duct sensor (for passenger side) is functioning properly. Air Conditioner AIR CONDITIONER REFERENCE CHART Tester Display Measure Item/Range Normal Condition Diagnostic Note Duct Sensor (P Side) Duct sensor (for passenger side) / Min.: -12.7°C (9.14°F) Max.: 76.55°C (169.79°F) Actual duct temperature is displayed (for passenger side) - OK: The display is as specified in the normal condition. Result RESULT CHART Result Proceed to NG A OK (Checking from the PROBLEM SYMPTOMS TABLE) B OK (Checking from the DTC) C B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (See «PROBLEM SYMPTOMS TABLE» ) C: REPLACE AIR CONDITIONING AMPLIFIER (See «REMOVAL» ) A: Go to Next Step
2. CHECK AIR CONDITIONING AMPLIFIER (TFAR - SG-3 VOLTAGE) Remove the air conditioning amplifier with its connectors still connected (see «REMOVAL» ). Turn the engine switch on (IG). Measure the voltage according to the value(s) in the table below. Standard voltage VOLTAGE REFERENCE CHART Tester Connection Switch Condition Specified Condition L77-22 (TFAR) - L77-11 (SG-3) Engine switch on (IG) at 25°C (77°F) 1.8 to 2.2 V Engine switch on (IG) at 50°C (122°F) 0.8 to 1.2 V HINT: As the temperature increases, the voltage decreases. Result RESULT CHART Result Proceed to NG A OK (Checking from the PROBLEM SYMPTOMS TABLE) B OK (Checking from the DTC) C B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (See «PROBLEM SYMPTOMS TABLE» ) C: REPLACE AIR CONDITIONING AMPLIFIER (See «REMOVAL» ) A: Go to Next Step
3. CHECK AIR DUCT SENSOR Remove the air duct sensor (see «REMOVAL» ). Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE REFERENCE CHART Tester Connection Condition Specified Condition 1 - 2 0°C (32°F) 14.5 to 19.0 kohms 25°C (77°F) 4.8 to 5.2 kohms 50°C (122°F) 1.6 to 2.0 kohms HINT: As the temperature increases, the resistance decreases. NG: REPLACE AIR DUCT SENSOR (See «REMOVAL» ) OK: Go to Next Step
4. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - AIR DUCT SENSOR) Disconnect the L87 air duct sensor connector. Disconnect the L77 air conditioning amplifier connector. Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE REFERENCE CHART Tester Connection Condition Specified Condition L77-22 (TFAR) - L87-1 Always Below 1 ohms L77-11 (SG-3) - L87-2 Always Below 1 ohms L77-22 (TFAR) - Body ground Always 10 kohms or higher L77-11 (SG-3) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE AIR CONDITIONING AMPLIFIER (See «REMOVAL» )

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 front light ECU (front controller).

The front light ECU (front controller) sends the read signal to the air conditioning amplifier via CAN communication line.

HINT

This circuit uses the CAN communication line. Before performing the inspection, check that the CAN communication system is functioning normally.

DTC DETECTION CONDITION CHART

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1. INSPECT FUSE (E/G RM-IG1-2) Remove the E/G RM-IG1-2 fuse from the engine room No. 2 relay block. Measure the resistance of the fuse. Standard resistance RESISTANCE REFERENCE CHART Tester Connection Condition Specified Condition E/G RM-IG1-2 fuse Always Below 1 ohms NG: REPLACE FUSE OK: Go to Next Step
2. READ VALUE USING TECHSTREAM (EMISSION GAS SENSOR) Use the Data List to check if the emission gas sensor is functioning properly. Air Conditioner AIR CONDITIONER REFERENCE CHART Tester Display Measurement Item/Range Normal Condition Diagnostic Note Emission Gas Sensor Emission gas sensor / Min.: 0, Max.: 255 Decreases as the gas amount increases - OK: The display is as specified in the normal condition. Result RESULT CHART Result Proceed to NG A OK (Checking from the PROBLEM SYMPTOMS TABLE) B OK (Checking from the DTC) C B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (See «PROBLEM SYMPTOMS TABLE» ) C: REPLACE AIR CONDITIONING AMPLIFIER (See «REMOVAL» ) A: Go to Next Step
3. CHECK HARNESS AND CONNECTOR (EXHAUST GAS SENSOR - BODY GROUND) Disconnect the B8 exhaust gas sensor connector. Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE REFERENCE CHART Tester Connection Condition Specified Condition B8-6 (E) - Body ground Always Below 1 ohms NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to Next Step
4. CHECK HARNESS AND CONNECTOR (EXHAUST GAS SENSOR - BATTERY) Disconnect the B8 exhaust gas sensor connector. Measure the voltage according to the value(s) in the table below. Standard voltage VOLTAGE REFERENCE CHART Tester Connection Switch Condition Specified Condition B8-3 (IG) - Body ground Engine switch on (IG) 11 to 14 V Engine 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 (see «REMOVAL» ). 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 according to the value(s) in the table below. Standard resistance RESISTANCE REFERENCE CHART Tester Connection Condition Specified Condition 1 (SG) - 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 decreases. NG: REPLACE EXHAUST GAS SENSOR (See «REMOVAL» ) OK: Go to Next Step
6. CHECK HARNESS AND CONNECTOR (EXHAUST GAS SENSOR - FRONT LIGHT ECU) Disconnect the B8 exhaust gas sensor connector. Disconnect the B14 front light ECU connector. Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE REFERENCE CHART Tester Connection Condition Specified Condition B8-1 (SG) - B14-9 (DGSE) Always Below 1 ohms B8-2 (DGS) - B14-11 (DGS) Always Below 1 ohms B14-9 (DGSE) - Body ground Always 10 kohms or higher B14-11 (DGS) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE FRONT LIGHT ECU

The rear room temperature sensor LH is installed in the rear door trim board LH to detect the rear room temperature and control the heater and air conditioner "AUTO" mode. The resistance of the rear room temperature sensor changes in accordance with the rear room temperature for LH seat. As the temperature decreases, the resistance increases. As the temperature increases, the resistance decreases.

The rear door ECU LH sends the read signal to the air conditioning amplifier via the CAN communication line. The rear door ECU LH applies voltage (5 V) to the rear room temperature sensor and reads voltage changes as the resistance of the rear room temperature sensor changes. This sensor also sends the appropriate signals to the rear door ECU LH.

HINT

This circuit uses the CAN communication line. Before performing the inspection, check that the CAN communication system is functioning normally.

DTC DETECTION CONDITION CHART

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Scheme 45

1. READ VALUE USING TECHSTREAM (REAR ROOM TEMPERATURE SENSOR) Use the Data List to check if the rear room temperature sensor for LH seat is functioning properly. Air Conditioner AIR CONDITIONER REFERENCE CHART Tester Display Measurement Item/Range Normal Condition Diagnostic Note Room Temperature Sensor (Rear) Rear room temperature sensor for LH seat/ Min.: -6.5°C (20.3°F) Max.: 57.25°C (135.05°F) Actual rear room temperature for LH seat 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 CHART Result Proceed to NG A OK (Checking from the PROBLEM SYMPTOMS TABLE) B OK (Checking from the DTC) C B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (See «PROBLEM SYMPTOMS TABLE» ) C: REPLACE AIR CONDITIONING AMPLIFIER (See «REMOVAL» ) A: Go to Next Step
2. INSPECT REAR ROOM TEMPERATURE SENSOR LH Remove the rear room temperature sensor LH (see «ROOM TEMPERATURE SENSOR (FOR REAR SIDE)» ). Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE REFERENCE CHART 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. HINT: As the temperature increases, the resistance decreases (see the graph below). NG: REPLACE REAR ROOM TEMPERATURE SENSOR LH (See «ROOM TEMPERATURE SENSOR (FOR REAR SIDE)» ) OK: Go to Next Step
3. CHECK HARNESS AND CONNECTOR (REAR ROOM TEMPERATURE SENSOR LH - REAR DOOR ECU LH) Disconnect the Q9 rear room temperature sensor LH connector. Disconnect the O15 rear door ECU LH connector. Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE REFERENCE CHART Tester Connection Condition Specified Condition Q9-2 - O15-26 (TRE) Always Below 1 ohms Q9-1 - O15-13 (TRAD) Always Below 1 ohms O15-26 (TRE) - Body ground Always 10 kohms or higher O15-13 (TRAD) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE REAR DOOR ECU LH

Scheme 46

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 air conditioning amplifier detects output current from the solar sensor.

DTC DETECTION CONDITION CHART

HINT

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

Scheme 47

Scheme 48

Scheme 49

Scheme 50

Scheme 51

1. READ VALUE USING TECHSTREAM (SOLAR SENSOR (for Passenger Side)) Use the Data List to check if the passenger side solar sensor is functioning properly. Air Conditioner AIR CONDITIONER REFERENCE CHART Tester Display Measurement Item/Range Normal Condition Diagnostic Note Solar Sensor (P Side) 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 CHART Result Proceed to NG A OK (Checking from the PROBLEM SYMPTOMS TABLE) B OK (Checking from the DTC) C B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (See «PROBLEM SYMPTOMS TABLE» ) C: REPLACE AIR CONDITIONING AMPLIFIER (See «REMOVAL» ) A: Go to Next Step
2. CHECK HARNESS AND CONNECTOR (SOLAR SENSOR) Disconnect the M2 solar sensor connector. Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE REFERENCE CHART Tester Connection Condition Specified Condition M2-3 (CLTE) - Body ground Always Below 1 ohms Measure the voltage according to the value(s) in the table below. Standard voltage VOLTAGE REFERENCE CHART Tester Connection Switch Condition Specified Condition M2-6 (CLTB) - M2-3 (CLTE) Engine switch on (IG) 11 to 14 V M2-6 (CLTB) - M2-3 (CLTE) Engine switch off Below 1 V OK: Go to step 4 NG: Go to Next Step
3. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - SOLAR SENSOR) Disconnect the L12 and DA main body ECU connectors. Disconnect the M2 solar sensor connector. Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE REFERENCE CHART Tester Connection Condition Specified Condition L12-20 (CLTB) - M2-6 (CLTB) Always Below 1 ohms L12-18 (CLTE) - M2-3 (CLTE) Always Below 1 ohms L12-20 (CLTB) - Body ground Always 10 kohms or higher L12-18 (CLTE) - Body ground Always 10 kohms or higher DA-40 (GND2) - Body ground Always Below 1 ohms NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE MAIN BODY ECU
4. CHECK HARNESS AND CONNECTOR (SOLAR SENSOR - AIR CONDITIONING AMPLIFIER) Disconnect the M2 solar sensor connector. Disconnect the L77 air conditioning amplifier connector. Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE REFERENCE CHART Tester Connection Condition Specified Condition L77-8 (TSP) - M2-2 (TSR) Always Below 1 ohms L77-8 (TSP) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to Next Step
5. CHECK SOLAR SENSOR (TSR - CLTE VOLTAGE) Remove the solar sensor with its connector still connected (see «SOLAR SENSOR (FOR FRONT SIDE)» ). Apply battery voltage between terminals 6 (CLTB) and 3 (CLTE) of the solar sensor. Measure the voltage according to the value(s) in the table below. Standard voltage VOLTAGE REFERENCE CHART 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 AUTOMATIC LIGHT CONTROL SENSOR (See «REMOVAL» ) OK: REPLACE AIR CONDITIONING AMPLIFIER (See «REMOVAL» )

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 front light ECU (front controller). The front light ECU (front controller) sends the read signal to the air conditioning amplifier via the CAN communication line. The air conditioning amplifier converts the signals to pressure according to the sensor characteristics to control the compressor.

HINT

1. 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.
2. This circuit uses the CAN communication line. Before performing the inspection, check that the CAN communication system is functioning normally.

DTC DETECTION CONDITION CHART

Scheme 52

Scheme 53

Scheme 54

Scheme 55

Scheme 56

1. CHECK REFRIGERANT Check the sight glass on the liquid pipe. Prepare the vehicle according to the chart below. ITEM CONDITION CHART Item Condition Vehicle Doors Fully open Temperature Setting MAX COLD Blower Speed HI A/C ON Engine switch on (IG) Compare the sight glass to the following chart. ITEM CONDITION 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 halogen 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 (See «REPLACEMENT» ) OK: Go to Next Step
2. READ VALUE USING TECHSTREAM (REFRIGERANT PRESSURE SENSOR) Use the Data List to check if the refrigerant pressure sensor is functioning properly. Air Conditioner AIR CONDITIONER REFERENCE CHART Tester Display Measurement Item/Range Normal Condition Diagnostic Note Regulator Pressure Sensor Refrigerant pressure sensor / Min.: 0 kgf/cm 2 G Max.: 38.25 kgf/cm 2 G Actual refrigerant pressure is displayed - OK: The display is as specified in the normal condition. Result RESULT CHART Result Proceed to NG A OK (Checking from the PROBLEM SYMPTOMS TABLE) B OK (Checking from the DTC) C B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (See «PROBLEM SYMPTOMS TABLE» ) C: REPLACE AIR CONDITIONING AMPLIFIER (See «REMOVAL» ) A: Go to Next Step
3. CHECK HARNESS AND CONNECTOR (PRESSURE SENSOR - FRONT LIGHT ECU) Disconnect the B4 pressure sensor connector. Disconnect the B14 front light ECU connector. Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE REFERENCE CHART Tester Connection Condition Specified Condition B4-2 (PR) - B14-13 (PRS) Always Below 1 ohms B4-3 (+) - B14-12 (SS) Always Below 1 ohms B4-1 (-) - B14-14 (SG) Always Below 1 ohms B14-13 (PRS) - Body ground Always 10 kohms or higher B14-12 (S5) - Body ground Always 10 kohms or higher B14-14 (SG) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to Next Step
4. CHECK FRONT LIGHT ECU Remove the front light ECU with its connectors still connected. Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE REFERENCE CHART Tester Connection Condition Specified Condition B14-14 (SG) - Body ground Always Below 1 ohms Measure the voltage according to the value(s) in the table below. Standard voltage VOLTAGE REFERENCE CHART Tester Connection Switch Condition Specified Condition B14-12 (S5) - B14-14 (SG) Engine switch on (IG) 4.5 to 5.5 V Engine switch off Below 1 V NG: REPLACE FRONT LIGHT ECU 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 FRONT LIGHT ECU

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.

DTC DETECTION CONDITION CHART

HINT

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

Scheme 57

Scheme 58

Scheme 59

1. READ VALUE USING TECHSTREAM (SOLAR SENSOR (for Driver Side)) Use the Data List to check if the driver side solar sensor is functioning properly. Air Conditioner AIR CONDITIONER REFERENCE CHART Tester Display Measurement Item/Range Normal Condition Diagnostic Note Solar Sensor (D Side) 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 CHART Result Proceed to NG A OK (Checking from the PROBLEM SYMPTOMS TABLE) B OK (Checking from the DTC) C B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (See «PROBLEM SYMPTOMS TABLE» ) C: REPLACE AIR CONDITIONING AMPLIFIER (See «REMOVAL» ) A: Go to Next Step
2. CHECK HARNESS AND CONNECTOR (SOLAR SENSOR) Disconnect the M2 solar sensor connector. Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE REFERENCE CHART Tester Connection Condition Specified Condition M2-3 (CLTE) - Body ground Always Below 1 ohms Measure the voltage according to the value(s) in the table below. Standard voltage VOLTAGE REFERENCE CHART Tester Connection Switch Condition Specified Condition M2-6 (CLTB) - M2-3 (CLTE) Engine switch on (IG) 11 to 14 V M2-6 (CLTB) - M2-3 (CLTE) Engine switch off Below 1 V OK: Go to step 4 NG: Go to Next Step
3. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - SOLAR SENSOR) Disconnect the L12 and DA main body ECU connectors. Disconnect the M2 solar sensor connector. Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE REFERENCE CHART Tester Connection Condition Specified Condition L12-20 (CLTB) - M2-6 (CLTB) Always Below 1 ohms L12-18 (CLTE) - M2-3 (CLTE) Always Below 1 ohms L12-20 (CLTB) - Body ground Always 10 kohms or higher L12-18 (CLTE) - Body ground Always 10 kohms or higher DA-40 (GND2) - Body ground Always Below 1 ohms NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE MAIN BODY ECU
4. CHECK HARNESS AND CONNECTOR (SOLAR SENSOR - A/C AMPLIFIER) Disconnect the M2 solar sensor connector. Disconnect the L77 A/C amplifier connector. Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE REFERENCE CHART Tester Connection Condition Specified Condition L77-7 (TSD) - M2-1 (TSL) Always Below 1 ohms L77-7 (TSD) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to Next Step
5. CHECK SOLAR SENSOR (TSL - CLTE VOLTAGE) Remove the solar sensor with its connector still connected (see «REMOVAL» ). Apply battery voltage between terminals 6 (CLTB) and 3 (CLTE) of the solar sensor. Measure the voltage according to the value(s) in the table below. Standard voltage VOLTAGE REFERENCE CHART Tester Connection Condition Specified Condition 1 (TSL) - 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 AUTOMATIC LIGHT CONTROL SENSOR (See «REMOVAL» ) OK: REPLACE AIR CONDITIONING AMPLIFIER (See «REMOVAL» )

The rear solar sensor, which is installed on the package tray trim panel, detects sunlight and controls the air conditioning in AUTO mode. The output current from the rear 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 rear junction block ECU sends the read signal to the air conditioning amplifier via the CAN communication line.

HINT

This circuit uses the CAN communication line. Before performing the inspection, check that the CAN communication system is functioning normally.

DTC DETECTION CONDITION CHART

Scheme 60

Scheme 61

Scheme 62

1. READ VALUE USING TECHSTREAM (REAR SOLAR SENSOR) Use the Data List to check if the rear solar sensor is functioning properly. Air Conditioner AIR CONDITIONER REFERENCE CHART Tester Display Measurement Item/Range Normal Condition Diagnostic Note Rear Solar Sensor Rear solar sensor / Min.: 0, Max.: 255 Rear 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 CHART Result Proceed to NG A OK (Checking from the PROBLEM SYMPTOMS TABLE) B OK (Checking from the DTC) C B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (See «PROBLEM SYMPTOMS TABLE» ) C: REPLACE AIR CONDITIONING AMPLIFIER (See «REMOVAL» ) A: Go to Next Step
2. INSPECT REAR SOLAR SENSOR Remove the rear solar sensor (see «SOLAR SENSOR (FOR REAR SIDE)» ). Measure the resistance according to the value(s) in the table below. Connect the positive (+) lead from the ohmmeter to terminal 1 and negative (-) lead to terminal 2 of the rear solar sensor. Standard resistance RESISTANCE REFERENCE CHART Tester Connection Condition Specified Condition 1 - 2 Sensor is subjected to electric light Below 1 ohms Sensor is covered by a cloth 10 kohms or higher HINT: As the inspection light is moved away from the sensor, the voltage decreases. Use an incandescent light for inspection. Bring it within 30 cm (11.8 in.) of the solar sensor. NG: REPLACE REAR SOLAR SENSOR (See «SOLAR SENSOR (FOR REAR SIDE)» ) OK: Go to Next Step
3. CHECK HARNESS AND CONNECTOR (REAR SOLAR SENSOR - REAR JUNCTION BLOCK ECU) Disconnect the v2 rear solar sensor connector. Disconnect the S62 rear junction block ECU connector. Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE REFERENCE CHART Tester Connection Condition Specified Condition v2-1 - S62-26 (TSB) Always Below 1 ohms v2-2 - S62-18 (TSD) Always Below 1 ohms S62-26 (TSB) - Body ground Always 10 kohms or higher S62-18 (TSD) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE LUGGAGE ROOM JUNCTION BLOCK (REAR JUNCTION BLOCK ECU)

The air mix damper servo (for passenger side HOT) sends pulse signals to inform the air conditioning amplifier of the damper position. The air conditioning amplifier activates the motor (normal, reverse) based on the signals to move the air mix damper (for passenger side HOT) 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 passenger 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.

DTC DETECTION CONDITION CHART

Scheme 63

The air inlet damper servo sends pulse signals to inform the air conditioning amplifier of the damper position. The air conditioning amplifier activates the motor (normal, reverse) based on the signals to move the air inlet 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.

DTC DETECTION CONDITION CHART

Scheme 64

The mode damper servo (for driver side FACE) sends pulse signals to inform the air conditioning amplifier of the damper position. The air conditioning amplifier activates the motor (normal, reverse) based on the signals to move the mode damper servo (for driver side FACE) 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.

DTC DETECTION CONDITION CHART

Scheme 65

The damper servo (for driver side cool air bypass) sends pulse signals to inform the air conditioning amplifier of the damper position. The air conditioning amplifier activates the motor (normal, reverse) based on the signals to move the damper servo (for driver side cool air bypass) to any position. As a result, when the air conditioner is operating, the temperature of the air blowing toward the driver'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.

DTC DETECTION CONDITION CHART

Scheme 66

The damper servo (for passenger side cool air bypass) sends pulse signals to inform the air conditioning amplifier of the damper position. The air conditioning amplifier activates the motor (normal, reverse) based on the signals to move the damper servo (for passenger side cool air bypass) to any position. As a result, when the air conditioner 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.

DTC DETECTION CONDITION CHART

Scheme 67

The air mix damper servo (for driver side HOT) sends pulse signals to inform the air conditioning amplifier of the damper position. The air conditioning amplifier activates the motor (normal, reverse) based on the signals to move the air mix damper (for driver side HOT) 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 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.

DTC DETECTION CONDITION CHART

Scheme 68

The mode damper servo (for passenger side FACE) sends pulse signals to inform the air conditioning amplifier of the damper position. The air conditioning amplifier activates the motor (normal, reverse) based on the signals to move the mode damper servo (for passenger side FACE) 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.

DTC DETECTION CONDITION CHART

Scheme 69

The rear outlet damper servo (for LH side) sends pulse signals to inform the air conditioning amplifier of the damper position. The air conditioning amplifier activates the motor (normal or reverse) based on these signals to move the rear outlet damper (for LH side) to the appropriate position, which controls the air outlet modes.

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.

DTC DETECTION CONDITION CHART

Scheme 70

In this circuit, the compressor receives a refrigerant compression demand signal from the air conditioning amplifier.

Based on this signal, the compressor changes the degree of refrigerant compression.

DTC DETECTION CONDITION CHART

Scheme 71

Scheme 72

Scheme 73

Scheme 74

1. READ VALUE USING TECHSTREAM (REFRIGERANT CONTROL CURRENT) Use the Data List to check if the refrigerant control current is functioning properly. Air Conditioner AIR CONDITIONER REFERENCE CHART Tester Display Measurement Item/Range Normal Condition Diagnostic Note Regulator Control Current Refrigerant control current / Min.: 0 A Max.: 0.997 A Value changes between 0 A and 0.997 A in accordance with compressor and magnetic clutch operation - OK: The display is as specified in the normal condition. Result RESULT CHART Result Proceed to NG A OK (Checking from the PROBLEM SYMPTOMS TABLE) B OK (Checking from the DTC) C B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (See «PROBLEM SYMPTOMS TABLE» ) C: REPLACE AIR CONDITIONING AMPLIFIER (See «REMOVAL» ) A: Go to Next Step
2. INSPECT COMPRESSOR AND PULLEY Disconnect the compressor and pulley connector. Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE REFERENCE CHART Tester Connection Condition Specified Condition 1 - 2 25°C (77°F) 10.1 to 11.1 ohms NG: REPLACE COMPRESSOR AND PULLEY (See «REMOVAL» ) OK: Go to Next Step
3. CHECK HARNESS AND CONNECTOR (COMPRESSOR AND PULLEY - AIR CONDITIONING AMPLIFIER) Disconnect the E11 compressor and pulley connector. Disconnect the L76 amplifier connector. Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE REFERENCE CHART Tester Connection Condition Specified Condition E11-2 (SOL+) - L76-4 (SOL+) Always Below 1 ohms E11-2 (SOL+) - Body Ground Always 1 Mohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to Next Step
4. CHECK HARNESS AND CONNECTOR (COMPRESSOR AND PULLEY - BODY GROUND) Disconnect the E11 compressor and pulley connector. Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE REFERENCE CHART Tester Connection Condition Specified Condition E11-1 (SOL-) - Body Ground Always Below 1 ohms NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE AIR CONDITIONING AMPLIFIER (See «REMOVAL» )

The air mix damper servo (for driver side COOL) sends pulse signals to inform the air conditioning amplifier of the damper position. The air conditioning amplifier activates the motor (normal, reverse) based on the signals to move the air mix damper (for driver side COOL) 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 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.

DTC DETECTION CONDITION CHART

Scheme 75

The air mix damper servo (for passenger side COOL) sends pulse signals to inform the air conditioning amplifier of the damper position. The air conditioning amplifier activates the motor (normal, reverse) based on the signals to move the air mix damper (for passenger side COOL) 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 passenger 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.

DTC DETECTION CONDITION CHART

Scheme 76

The mode damper servo (for driver side FOOT/DEF) sends pulse signals to inform the air conditioning amplifier of the damper position. The air conditioning amplifier activates the motor (normal, reverse) based on the signals to move the mode damper servo (for driver side FOOT/DEF) 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.

DTC DETECTION CONDITION CHART

Scheme 77

The mode damper servo (for passenger side FOOT/DEF) sends pulse signals to inform the air conditioning amplifier of the damper position. The air conditioning amplifier activates the motor (normal, reverse) based on the signals to move the mode damper servo (for passenger side FOOT/DEF) 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.

DTC DETECTION CONDITION CHART

Scheme 78

The air mix damper servo (for driver side front A/C rear air flow) sends pulse signals to inform the air conditioning amplifier of the damper position. The air conditioning amplifier activates the motor (normal, reverse) based on the signals to move the air mix damper (for driver side front A/C rear air flow) 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 rear driver 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.

DTC DETECTION CONDITION CHART

Scheme 79

The air mix damper servo (for passenger side front A/C rear air flow) sends pulse signals to inform the air conditioning amplifier of the damper position. The air conditioning amplifier activates the motor (normal, reverse) based on the signals to move the air mix damper (for passenger side front A/C rear air flow) 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 rear passenger 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.

DTC DETECTION CONDITION CHART

Scheme 80

The max hot bypass damper servo motor (for HOT) sends pulse signals to inform the air conditioning amplifier of the damper position. The air conditioning amplifier activates the motor (normal, reverse) based on the signals to move the max hot bypass damper servo motor (for HOT) to any position. As a result, when the air conditioner is operating, the temperature of the air blowing toward the driver'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.

DTC DETECTION CONDITION CHART

Scheme 81

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 NOx in the emission gas and transmits signals to the front light ECU (front controller).

The front light ECU (front controller) sends the read signal to the air conditioning amplifier via CAN communication line.

HINT

This circuit uses the CAN communication line. Before performing the inspection, check that the CAN communication system is functioning normally.

DTC DETECTION CONDITION CHART

Scheme 82

Scheme 83

1. INSPECT FUSE (E/G RM-IG1-2) Remove the E/G RM-IG1-2 fuse from the engine room No. 2 relay block. Measure the resistance of the fuse. Standard resistance RESISTANCE REFERENCE CHART Tester Connection Condition Specified Condition E/G RM-IG1-2 fuse Always Below 1 ohms NG: REPLACE FUSE OK: Go to Next Step
2. READ VALUE USING TECHSTREAM (EMISSION GAS NOX SENSOR) Use the Data List to check if the emission gas NOx sensor is functioning properly. Air Conditioner AIR CONDITIONER REFERENCE CHART Tester Display Measurement Item/Range Normal Condition Diagnostic Note Emission Gas Nox Sensor Emission gas NOx sensor/ Min.: 0, Max.: 255 Increases as the gas amount increases - OK: The display is as specified in the normal condition. Result RESULT CHART Result Proceed to NG A OK (Checking from the PROBLEM SYMPTOMS TABLE) B OK (Checking from the DTC) C B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (See «PROBLEM SYMPTOMS TABLE» ) C: REPLACE AIR CONDITIONING AMPLIFIER (See «REMOVAL» ) A: Go to Next Step
3. CHECK HARNESS AND CONNECTOR (EXHAUST GAS SENSOR - BODY GROUND) Disconnect the B8 exhaust gas sensor connector. Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE REFERENCE CHART Tester Connection Condition Specified Condition B8-6 (E) - Body ground Always Below 1 ohms NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to Next Step
4. CHECK HARNESS AND CONNECTOR (EXHAUST GAS SENSOR - BATTERY) Disconnect the B8 exhaust gas sensor connector. Measure the voltage according to the value(s) in the table below. Standard voltage VOLTAGE REFERENCE CHART Tester Connection Switch Condition Specified Condition B8-3 (IG) - Body ground Engine switch on (IG) 11 to 14 V Engine 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 (see «REMOVAL» ). After applying battery voltage between terminals 3 (IG) and 6 (E) for more than 30 seconds, measure the resistance between terminals 1 (SG) and 4 (DGS1). Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE REFERENCE CHART Tester Connection Condition Specified Condition 1 (SG) - 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 (See «REMOVAL» ) OK: Go to Next Step
6. CHECK HARNESS AND CONNECTOR (EXHAUST GAS SENSOR - FRONT LIGHT ECU) Disconnect the B8 exhaust gas sensor connector. Disconnect the B14 front light ECU connector. Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE REFERENCE CHART Tester Connection Condition Specified Condition B8-1 (SG) - B14-9 (DGSE) Always Below 1 ohms B8-4 (DGS1) - B14-10 (DGS1) Always Below 1 ohms B14-9 (DGSE) - Body ground Always 10 kohms or higher B14-10 (DGS1) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE FRONT LIGHT ECU

The rear room temperature sensor RH is installed in the rear door trim board RH to detect the rear room temperature and control the heater and air conditioner "AUTO" mode. The resistance of the rear room temperature sensor changes in accordance with the rear room temperature for RH seat. As the temperature decreases, the resistance increases. As the temperature increases, the resistance decreases.

The rear door ECU RH sends the read signal to the air conditioning amplifier via the CAN communication line. The rear door ECU RH applies voltage (5 V) to the rear room temperature sensor and reads voltage changes as the resistance of the rear room temperature sensor changes. This sensor also sends the appropriate signals to the rear door ECU RH.

HINT

This circuit uses the CAN communication line. Before performing the inspection, check that the CAN communication system is functioning normally.

DTC DETECTION CONDITION CHART

Scheme 84

Scheme 85

Scheme 86

1. READ VALUE USING TECHSTREAM (REAR ROOM TEMPERATURE SENSOR (for RH)) Use the Data List to check if the rear room temperature sensor (for RH seat) is functioning properly. Air Conditioner AIR CONDITIONER REFERENCE CHART Tester Display Measurement Item/Range Normal Condition Diagnostic Note Room Temperature Sensor (RP) Rear room temperature sensor (for RH seat) / Min.: -6.5°C (20.3°F) Max.: 57.25°C (135.05°F) Actual rear room temperature for RH seat 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 CHART Result Proceed to NG A OK (Checking from the PROBLEM SYMPTOMS TABLE) B OK (Checking from the DTC) C B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (See «PROBLEM SYMPTOMS TABLE» ) C: REPLACE AIR CONDITIONING AMPLIFIER (See «REMOVAL» ) A: Go to Next Step
2. INSPECT REAR ROOM TEMPERATURE SENSOR RH Remove the rear room temperature sensor RH (see «ROOM TEMPERATURE SENSOR (FOR REAR SIDE)» ). Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE REFERENCE CHART 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. HINT: As the temperature increases, the resistance decreases (see the graph below). NG: REPLACE REAR ROOM TEMPERATURE SENSOR RH (See «ROOM TEMPERATURE SENSOR (FOR REAR SIDE)» ) OK: Go to Next Step
3. CHECK HARNESS AND CONNECTOR (REAR ROOM TEMPERATURE SENSOR RH - REAR DOOR ECU RH) Disconnect the Q4 rear room temperature sensor RH connector. Disconnect the O2 rear door ECU RH connector. Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE REFERENCE CHART Tester Connection Condition Specified Condition Q4-2 - O2-26 (TRE) Always Below 1 ohms Q4-1 - O2-13 (TRAD) Always Below 1 ohms O2-26 (TRE) - Body ground Always 10 kohms or higher O2-13 (TRAD) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE REAR DOOR ECU RH

The infrared ray sensor, which is installed on the rear roof, detects human body temperature and control the heater and air conditioner "AUTO" mode in 4 zones. Signals are transmitted to the air conditioning amplifier via the LIN communication line. This DTC is output when the temperature of the physical object is detected as -30°C (-22°F) or less, or 80°C (176°F) or more for 10 seconds or more.

DTC DETECTION CONDITION CHART

Scheme 87

Scheme 88

1. INSPECT FUSE (D-IG1-3) Remove the D-IG1-3 fuse from the driver side junction block. Measure the resistance of the fuse. Standard resistance RESISTANCE REFERENCE CHART Tester Connection Condition Specified Condition D-IG1-3 fuse Always Below 1 ohms NG: REPLACE FUSE OK: Go to Next Step
2. CHECK HARNESS AND CONNECTOR (INFRARED RAY SENSOR - BODY GROUND AND BATTERY) Disconnect the X13 infrared ray sensor connector. Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE REFERENCE CHART Tester Connection Condition Specified Condition X13-1 (E) - Body ground Always 10 kohms or higher Measure the voltage according to the value(s) in the table below. Standard voltage VOLTAGE REFERENCE CHART Tester Connection Switch Condition Specified Condition X13-5 (IG) - Body ground Engine switch on (IG) 11 to 14 V Engine switch off Below 1 V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE INFRARED RAY SENSOR (See «INFRARED RAY SENSOR» )

The mode damper servo (for driver side front A/C rear air flow) sends pulse signals to inform the air conditioning amplifier of the damper position. The air conditioning amplifier activates the motor (normal, reverse) based on the signals to move the mode damper servo (for driver side front A/C rear air flow) 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.

DTC DETECTION CONDITION CHART

Scheme 89

The mode damper servo (for passenger side front A/C rear air flow) sends pulse signals to inform the air conditioning amplifier of the damper position. The air conditioning amplifier activates the motor (normal, reverse) based on the signals to move the mode damper servo (for passenger side front A/C rear air flow) 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.

DTC DETECTION CONDITION CHART

Scheme 90

The rear outlet damper servo (for RH side) sends pulse signals to inform the air conditioning amplifier of the damper position. The air conditioning amplifier activates the motor (normal or reverse) based on these signals to move the rear outlet damper (for RH side) to the appropriate position, which controls the air outlet modes.

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.

DTC DETECTION CONDITION CHART

Scheme 91

This circuit consists of the infrared ray sensor and the air conditioning amplifier. The infrared ray sensor, which is installed on the rear roof, detects human body temperature and control the heater and air conditioner "AUTO" mode in 4 zones. Signals are transmitted to the air conditioning amplifier via the LIN communication line. This DTC is output when communication between the infrared ray sensor and the air conditioning amplifier stops for 10 seconds or more. If the LIN communication system malfunctions, the air conditioning amplifier does not operate even if the infrared ray sensor is normal.

DTC DETECTION CONDITION CHART

Scheme 92

1. CHECK HARNESS AND CONNECTOR (INFRARED RAY SENSOR - AIR CONDITIONING AMPLIFIER) Disconnect the X13 infrared ray sensor connector. Disconnect the L76 air conditioning amplifier connector. Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE REFERENCE CHART Tester Connection Condition Specified Condition X13-3 (LIN) - L76-28 (LIN1) Always Below 1 ohms X13-3 (LIN) - Body ground Always 10 kohms or higher L76-28 (LIN1) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to Next Step
2. REPLACE INFRARED RAY SENSOR Replace the infrared ray sensor with a new or properly functioning one (see «INFRARED RAY SENSOR» ). Operate the infrared ray sensor to check that it functions properly. OK: Infrared ray sensor function operates normally. Result RESULT CHART Result Proceed to Infrared ray sensor malfunctions A Infrared ray sensor functions properly B B: END (INFRARED RAY SENSOR IS FAULTY) A: REPLACE AIR CONDITIONING AMPLIFIER (See «REMOVAL» )

The max hot bypass damper servo motor (for COOL) sends pulse signals to inform the air conditioning amplifier of the damper position. The air conditioning amplifier activates the motor (normal, reverse) based on the signals to move the max hot bypass damper servo motor (for COOL) to any position. As a result, when the air conditioner is operating, the temperature of the air blowing toward the driver'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.

DTC DETECTION CONDITION CHART

Scheme 93

The rear exhaust mode damper servo (for emission) sends pulse signals to inform the air conditioning amplifier of the damper position. The air conditioning amplifier activates the motor (normal or reverse) based on these signals to move the rear exhaust mode damper to the appropriate position, which controls the rear exhaust modes.

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.

DTC DETECTION CONDITION CHART

Scheme 94

The rear exhaust mode damper servo (for diffusion) sends pulse signals to inform the air conditioning amplifier of the damper position. The air conditioning amplifier activates the motor (normal or reverse) based on these signals to move the rear exhaust mode damper to the appropriate position, which controls the rear exhaust modes.

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.

DTC DETECTION CONDITION CHART

Scheme 95

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.

DTC DETECTION CONDITION CHART

Scheme 96

Scheme 97

Scheme 98

1. CHECK AIR CONDITIONING AMPLIFIER Remove the air conditioning amplifier with its connectors still connected (see «REMOVAL» ). Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE REFERENCE CHART Tester Connection Condition Specified Condition L76-1 (GND) - z1-1 (BUSG) Always Below 1 ohms L76-1 (GND) - z1-8 (BUSG) Always Below 1 ohms L76-1 (GND) - z1-11 (BUSG) Always Below 1 ohms z1-1 (BUSG) - Body ground Always Below 1 ohms z1-8 (BUSG) - Body ground Always Below 1 ohms z-1-11 (BUSG) - Body ground Always Below 1 ohms Measure the voltage according to the value(s) in the table below. Standard voltage VOLTAGE REFERENCE CHART Tester Connection Switch Condition Specified Condition z1-1 (BUSG) - z1-3 (BBUS) Always 11 to 14 V z1-8 (BUSG) - z1-10 (BBUS) Always 11 to 14 V z1-11 (BUSG) - z1-13 (BBUS) Always 11 to 14 V z1-1 (BUSG) - z1-2 (BUS) Engine switch on (IG) Pulse generation z1-8 (BUSG) - z1-9 (BUS) Engine switch on (IG) Pulse generation z1-11 (BUSG) - z1-12 (BUS) Engine switch on (IG) Pulse generation NG: REPLACE AIR CONDITIONING AMPLIFIER (See «REMOVAL» ) OK: REPLACE AIR CONDITIONING HARNESS (See «DISASSEMBLY» )

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

DTC DETECTION CONDITION CHART

Scheme 99

This circuit consists of the rear A/C switch (built into rear power seat module) and the air conditioning amplifier. When the rear A/C switch is operated, signals are transmitted to the air conditioning amplifier through the LIN communication system.

If the LIN communication system malfunctions, the air conditioning amplifier does not operate even if the rear A/C switch is operated.

Scheme 100

Scheme 101

Scheme 102

1. INSPECT FUSE (RR MPX-B2) Remove the RR MPX-B2 fuse from the luggage room junction block. Measure the resistance of the fuse. Standard resistance RESISTANCE REFERENCE CHART Tester Connection Condition Specified Condition RR MPX-B2 fuse Always Below 1 ohms NG: REPLACE FUSE OK: Go to Next Step
2. CHECK HARNESS AND CONNECTOR (REAR POWER SEAT MODULE - BODY GROUND AND BATTERY) Disconnect the r2*1 or S15*2 rear power seat module connector. Measure the resistance according to the value(s) in the table below. Standard resistance w/o Ottoman RESISTANCE REFERENCE CHART Tester Connection Condition Specified Condition r2-3 (E) - Body ground Always Below 1 ohms w/ Ottoman RESISTANCE REFERENCE CHART Tester Connection Condition Specified Condition S15-5 (E) - Body ground Always Below 1 ohms Measure the voltage according to the value(s) in the table below. Standard voltage w/o Ottoman VOLTAGE REFERENCE CHART Tester Connection Condition Specified Condition r2-11 (B) - Body ground Always 11 to 14 V w/ Ottoman VOLTAGE REFERENCE CHART Tester Connection Condition Specified Condition S15-6 (B) - Body ground Always 11 to 14 V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to Next Step
3. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - REAR POWER SEAT MODULE) Disconnect the r2*1 or S15*2 rear power seat module connector. Disconnect the L76 air conditioning amplifier connector. Measure the resistance according to the value(s) in the table below. Standard resistance w/o Ottoman RESISTANCE REFERENCE CHART Tester Connection Condition Specified Condition L76-21 (LIN3) - r2-14 (RCLN) Always Below 1 ohms L76-21 (LIN3) - Body ground Always 10 kohms or higher w/ Ottoman RESISTANCE REFERENCE CHART Tester Connection Condition Specified Condition L76-21 (LIN3) - S15-13 (RCLN) Always Below 1 ohms L76-21 (LIN3) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to Next Step
4. REPLACE REAR POWER SEAT MODULE Replace the rear power seat module with a new or properly functioning one (see «REMOVAL»(/lexus/ls/iv-2006-2012/remont/entertainment-systems/#audiovisual) ). Operate the rear power seat module to check that it functions properly. OK: Rear power seat module function operates normally. NG: REPLACE AIR CONDITIONING AMPLIFIER (See «REMOVAL» ) OK: END (REAR POWER SEAT MODULE IS FAULTY)

PTC heater relays are closed in accordance with signals from the air conditioning amplifier and power is supplied to the PTC heater installed on the radiator heater unit.

Scheme 103

Scheme 104

Scheme 105

Scheme 106

Scheme 107

1. INSPECT FUSE(PTC HTR1, PTC HTR2, PTC HTR3, PTC HTR) Remove the PTC HTR1 and PTC HTR3 fuses, and PTC HTR and PTC HTR2 H-fuses from the engine room No. 1 relay block. Measure the resistance of the fuses. Standard resistance RESISTANCE REFERENCE CHART Tester Connection Condition Specified Condition PTC HTR1 fuse Always Below 1 ohms PTC HTR2 H-fuse Always Below 1 ohms PTC HTR3 fuse Always Below 1 ohms PTC HTR H-fuse Always Below 1 ohms NG: REPLACE FUSE OK: Go to Next Step
2. CHECK AIR CONDITIONING AMPLIFIER Remove the air conditioning amplifier with its connectors still connected (see «REMOVAL» ). Turn the engine switch on (IG). When the PTC heater operating conditions are met (engine at idling speed or faster, ambient temperature is 10°C (50°F) or less, engine coolant temperature is 65°C (149°F) or less, set temperature switch is set to MAX HOT), turn the blower switch to the LO setting. Measure the voltage according to the value(s) in the table below. Standard voltage VOLTAGE REFERENCE CHART Tester Connection Switch Condition Specified Condition L76-27 (PTC1) - Body ground Engine switch on (IG) Blower Switch LO 11 to 14 V L76-26 (PTC2) - Body ground Engine switch on (IG) Blower Switch LO 11 to 14 V L76-35 (PTC3) - Body ground Engine switch on (IG) Blower Switch LO 11 to 14 V NG: REPLACE AIR CONDITIONING AMPLIFIER (See «REMOVAL» ) OK: Go to Next Step
3. INSPECT PTC HEATER RELAY (PTC HTR1, PTC HTR2, PTC HTR3) Remove the PTC heater relays from the No. 5 relay block. Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE REFERENCE CHART Tester Connection Condition Specified Condition 3 - 5 When battery voltage is not applied between terminals 1 and 2 10 kohms or higher When battery voltage is applied to terminals 1 and 2 Below 1 ohms NG: REPLACE PTC HEATER RELAY OK: Go to Next Step
4. CHECK HARNESS AND CONNECTOR (PTC HEATER RELAY - PTC HEATER) Remove the PTC heater relays from the No. 5 relay block. Disconnect the L40 PTC heater connector. Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE REFERENCE CHART Tester Connection Condition Specified Condition PTC HTR1 terminal 3 - L40-1 (B) Always Below 1 ohms PTC HTR2 terminal 5 - L40-2 (B) Always Below 1 ohms PTC HTR3 terminal 3 - L40-3 (B) Always Below 1 ohms NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to Next Step
5. CHECK PTC HEATER Disconnect the L40 and L41 PTC heater connectors. Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE REFERENCE CHART Tester Connection Condition Specified Condition L40-1 (B) - L41-1 (E) Always Below 1 ohms L40-2 (B) - L41-1 (E) Always Below 1 ohms L40-1 (B) - L41-2 (E) Always Below 1 ohms L40-3 (B) - L41-2 (E) Always Below 1 ohms NG: REPLACE PTC HEATER (See «PTC HEATER ASSEMBLY» ) OK: Go to Next Step
6. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - BODY GROUND) Remove the air conditioning amplifier with its connectors still connected (see «REMOVAL» ). Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE REFERENCE CHART Tester Connection Condition Specified Condition L76-27 (PTC1) - Body ground Always Below 1 ohms L76-26 (PTC2) - Body ground Always Below 1 ohms L76-35 (PTC3) - Body ground Always Below 1 ohms NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE AIR CONDITIONING AMPLIFIER (See «REMOVAL» )

Scheme 108

The rear blower motor is operated by signals from the air conditioning amplifier. Rear blower motor speed signals are transmitted by changes in the duty ratio.

Duty Ratio

The duty ratio is the ratio of the rear blower motor ON time (A) to the total of the rear blower motor ON and OFF time (A + B).

The rear blower motor controller controls the rear blower motor speed.

Scheme 109

Scheme 110

Scheme 111

Scheme 112

Scheme 113

Scheme 114

Scheme 115

1. PERFORM ACTIVE TEST USING TECHSTREAM (REAR BLOWER MOTOR) Select the Active Test, using the Techstream to generate a control command, and then check that the rear blower motor operates. Air Conditioner AIR CONDITIONER REFERENCE CHART Tester Display Test Part Control Range Diagnostic Note Rear Blower Motor Rear blower motor Min.: 0, Max.: 31 - Result RESULT CHART Result Proceed to NG (rear blower motor does not operate) A NG (rear blower motor operates but does not change speed) B OK C B: Go to step 6 C: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (See «PROBLEM SYMPTOMS TABLE» ) A: Go to Next Step
2. INSPECT FUSE (RR A/C) Remove the RR A/C H-fuse from the engine room No. 1 relay block. Measure the resistance of the fuse. Standard resistance RESISTANCE REFERENCE CHART Tester Connection Condition Specified Condition RR A/C H-fuse Always Below 1 ohms NG: REPLACE FUSE OK: Go to Next Step
3. CHECK HARNESS AND CONNECTOR (REAR BLOWER MOTOR - BODY GROUND) Disconnect the v3 rear blower motor connector. Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE REFERENCE CHART Tester Connection Condition Specified Condition v3-1 (GND) - Body ground Always Below 1 ohms NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to Next Step
4. CHECK HARNESS AND CONNECTOR (REAR BLOWER MOTOR - BATTERY) Disconnect the v3 rear blower motor connector. Measure the voltage according to the value(s) in the table below. Standard voltage VOLTAGE REFERENCE CHART Tester Connection Condition Specified Condition v3-3 (+B) - Body ground Always 11 to 14 V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to Next Step
5. CHECK REAR BLOWER MOTOR (SI VOLTAGE) Disconnect the v3 rear blower motor connector. Measure the voltage according to the value(s) in the table below. Standard voltage VOLTAGE REFERENCE CHART Tester Connection Switch Condition Specified Condition v3-2 (SI) - Body ground Engine switch on (IG) 4.5 to 5.5 V NG: Go to step 8 OK: Go to Next Step
6. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - REAR BLOWER MOTOR) Disconnect the L76 air conditioning amplifier connector. Measure the voltage according to the value(s) in the table below. Standard voltage VOLTAGE REFERENCE CHART Tester Connection Switch Condition Specified Condition L76-17 (SBLW) - L76-1 (GND) Engine switch on (IG) Blower switch OFF 4.5 to 5.5 V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to Next Step
7. CHECK AIR CONDITIONING AMPLIFIER (SBLW SIGNAL) Remove the air conditioning amplifier with its connectors still connected (see «REMOVAL» ). Turn the engine switch on (IG). Turn the rear blower switch ON (Lo). Using an oscilloscope, check the waveform. Waveform (Reference): WAVEFORM REFERENCE CHART Item Contents Test Connector SBLW (L76-17) - GND (L76-1) Tool Setting 1 V/DIV., 500 μsec./DIV. Vehicle Condition Engine switch: on (IG) Blower switch: OFF --> ON OK: Waveform is as shown in the illustration. HINT: Waveform varies with the blower level. NG: REPLACE AIR CONDITIONING AMPLIFIER (See «REMOVAL» ) OK: REPLACE REAR BLOWER MOTOR (See «DISASSEMBLY» )
8. CHECK HARNESS AND CONNECTOR (REAR BLOWER MOTOR - AIR CONDITIONING AMPLIFIER) Disconnect the L76 air conditioning amplifier connector. Disconnect the v3 rear blower motor connector. Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE REFERENCE CHART Tester Connection Condition Specified Condition v3-2 (SI) - L76-17 (SBLW) Always Below 1 ohms v3-2 (SI) - Body ground Always 10 kohms or higher L76-17 (SBLW) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE REAR BLOWER MOTOR (See «DISASSEMBLY» )

The rear cooler expansion valve (rear magnetic valve) is controlled by the rear junction block ECU and the air conditioning amplifier via the CAN communication line.

HINT

This circuit uses the CAN communication line. Before performing the inspection, check that the CAN communication system is functioning normally.

Scheme 116

Scheme 117

1. PERFORM ACTIVE TEST USING TECHSTREAM (REAR A/C MAGNETIC VALVE) Select the Active Test, using the Techstream to generate a control command, and then check that the rear magnetic valve operates. Air Conditioner AIR CONDITIONER REFERENCE CHART Tester Display Test Part Control Range Diagnostic Note Rear A/C Mag Valve Rear A/C magnetic valve OFF, ON - Result RESULT CHART Result Proceed to NG (rear magnetic valve operates normally) A NG (checking from the PROBLEM SYMPTOMS TABLE) B OK C B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (See «PROBLEM SYMPTOMS TABLE» ) C: REPLACE AIR CONDITIONING AMPLIFIER (See «REMOVAL» ) A: Go to Next Step
2. INSPECT FUSE (RR-IG1-2) Remove the RR-IG1-2 fuse from the luggage room junction block. Measure the resistance of the fuse. Standard resistance RESISTANCE REFERENCE CHART Tester Connection Condition Specified Condition RR-IG1-2 fuse Always Below 1 ohms NG: REPLACE FUSE OK: Go to Next Step
3. CHECK HARNESS AND CONNECTOR (REAR AIR CONDITIONING HARNESS - REAR JUNCTION BLOCK ECU) Disconnect the S28 rear air conditioning harness connector. Disconnect the S62 rear junction block ECU connector. Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE REFERENCE CHART Tester Connection Condition Specified Condition S28-4 (RMGV) - S62-5 (RMGV) Always Below 1 ohms S28-4 (RMGV) - Body ground Always 10 kohms or higher S62-5 (RMGV) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to Next Step
4. REPLACE REAR MAGNETIC VALVE HINT: Since the rear magnetic valve cannot be inspected while it is removed from the vehicle, replace the rear magnetic valve with a normal one and check that the condition returns to normal. OK: Same problem does not occur. OK: END (REAR MAGNETIC VALVE IS FAULTY) NG: Go to Next Step
5. REPLACE REAR AIR CONDITIONING HARNESS HINT: Replace the rear air conditioning harness with a normal one and check that the condition returns to normal (see «DISASSEMBLY» ). OK: Same problem does not occur. NG: REPLACE REAR JUNCTION BLOCK ECU OK: END (REAR AIR CONDITIONING HARNESS IS FAULTY)

This sensor detects the smoke level inside the cabin and sends the appropriate signals to the rear junction block ECU.

HINT

This circuit uses the CAN communication line. Before performing the inspection, check that the CAN communication system is functioning normally.

Scheme 118

Scheme 119

Scheme 120

Scheme 121

1. INSPECT FUSE (RR-IG1-2) Remove the RR-IG1-2 fuse from the luggage room junction block. Measure the resistance of the fuse. Standard resistance RESISTANCE REFERENCE CHART Tester Connection Condition Specified Condition RR-IG1-2 fuse Always Below 1 ohms NG: REPLACE FUSE OK: Go to Next Step
2. CHECK REAR JUNCTION BLOCK ECU (SMOK VOLTAGE) Remove the rear junction block ECU with connectors still connected. Measure the voltage according to the value(s) in the table below when applying or not applying cigarette smoke. Standard voltage VOLTAGE REFERENCE CHART Tester Connection Switch Condition Specified Condition S62-7 (SMOK) - Body ground Engine switch on (IG) Rear cooler AUTO switch ON Apply cigarette smoke Above 4.0 V Engine switch on (IG) Rear cooler AUTO switch ON No cigarette smoke Below 1 V OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (See «PROBLEM SYMPTOMS TABLE» ) NG: Go to Next Step
3. INSPECT SMOKE SENSOR Remove the smoke sensor (see «DISASSEMBLY» ). Connect the positive (+) lead from the battery to terminal 1 and negative (-) lead to terminal 3. Measure the voltage according to the value(s) in the table below. Standard voltage VOLTAGE REFERENCE CHART Tester Connection Condition Specified Condition 2 - 3 There is no cigarette smoke Below 1.0 V There is cigarette smoke Above 4.0 V NOTE: Since the sensor determines the amount of smoke based on the changes in the amount of light, check the sensor in an area with as little ambient light as possible. NG: REPLACE SMOKE SENSOR (See «DISASSEMBLY» ) OK: Go to Next Step
4. CHECK HARNESS AND CONNECTOR (REAR JUNCTION BLOCK ECU - REAR AIR CONDITIONING HARNESS) Disconnect the S62 rear junction block ECU connector. Disconnect the S28 rear air conditioning harness connector. Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE REFERENCE CHART Tester Connection Condition Specified Condition S62-7 (SMOK) - S28-13 (S) Always Below 1 ohms S62-7 (SMOK) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to Next Step
5. REPLACE REAR AIR CONDITIONING HARNESS HINT: Replace the rear air conditioning harness with a normal one and check that the condition returns to normal (see «DISASSEMBLY» ). OK: Same problem does not occur. NG: REPLACE REAR JUNCTION BLOCK ECU OK: END (REAR AIR CONDITIONING HARNESS IS FAULTY)

The main power source is supplied to the air conditioning amplifier when the engine switch is on (IG). The power source is used for operating the air conditioning amplifier and servo motor, etc.

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

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1. INSPECT FUSE (A/C) Remove the A/C fuse from the passenger side junction block. Measure the resistance of the fuse. Standard resistance RESISTANCE REFERENCE CHART Tester Connection Condition Specified Condition A/C fuse Always Below 1 ohms NG: REPLACE FUSE OK: Go to Next Step
2. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - BATTERY) Disconnect the L76 air conditioning amplifier connector. Measure the voltage according to the value(s) in the table below. Standard voltage VOLTAGE REFERENCE CHART Tester Connection Condition Specified Condition L76-6 (+B1) - Body ground Always 11 to 14 V L76-7 (+B2) - 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 «PROBLEM SYMPTOMS TABLE» )

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1. INSPECT REFRIGERANT VOLUME Check the sight glass on the liquid tube sub-assembly A. Test conditions: Temperature at the air inlet is 30 to 35°C (86 to 95°F). Engine is running at 1500 rpm. Blower speed control switch is at HI. A/C switch is ON. Temperature control switch is at the MAX. COOL position. Doors are fully open. ITEM CONDITION CHART Item Symptom Amount of Refrigerant Corrective Procedures 1 Bubbles visible Insufficient* Check for gas leakage and repair if necessary Add refrigerant until bubbles disappear 2 No bubbles visible Empty, insufficient or too much Refer to items 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 Add refrigerant until bubbles disappear 4 Considerable temperature difference between compressor inlet and outlet Correct or too much Refer to items 5 and 6 5 Immediately after A/C is turned OFF, refrigerant becomes clear Too much Drain or discharge refrigerant Bleed air and supply proper amount of purified refrigerant 6 Immediately after A/C is turned OFF, refrigerant foams and then becomes clear Correct - HINT: *: If the ambient temperature is higher than usual but cooling is sufficient, bubbles in the sight glass are permissible.
2. INSPECT REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET This method uses a manifold gauge set to locate problem areas. Read the manifold gauge pressure when these conditions are established. Test conditions: Temperature at the air inlet is 30 to 35°C (86 to 95°F). Engine is running at 1500 rpm. All doors are fully open. Blower speed control switch is at HI. A/C switch is ON. Gauge readings (Reference). Normally functioning refrigeration system Gauge reading GAUGE READING REFERENCE CHART Pressure side Refrigerant volume Low 0.15 to 0.25 MPa (1.5 to 2.5 kgf/cm 2 ) High 1.37 to 1.57 MPa (14 to 16 kgf/cm 2 ) The A/C system periodically changes between normal and improper function due to moisture in the refrigerant system. SYMPTOMS CHART Symptoms Probable Cause Diagnosis Corrective Actions During operation, pressure on low pressure side cycles between normal and vacuum Moisture in refrigeration system freezes at expansion valve orifice, causing temporary stop of cycle. However, when melted, normal state is restored. Drier is overly saturated Moisture in refrigeration system freezes at expansion valve orifice and blocks refrigerant circulation Replace cooler drier Remove moisture from cycle by repeatedly evacuating air Supply appropriate volume of new refrigerant The A/C system does not function effectively due to insufficient cooling. SYMPTOMS CHART Symptoms Probable Cause Diagnosis Corrective Actions Pressure low on both low and high pressure sides Cooling performance insufficient Gas leakage from refrigeration system Insufficient refrigerant Refrigerant leakage Check for gas leakage and repair if necessary Supply appropriate volume of new refrigerant If indicated pressure value close to 0 when connected to gauge, create vacuum after inspecting and repairing the location of leakage The A/C system does not function effectively due to poor circulation of the refrigerant. SYMPTOMS CHART Symptoms Probable Cause Diagnosis Corrective Actions Pressure low on both low and high pressure sides Frost exists on piping from condenser to A/C unit Refrigerant flow obstructed by dirt in condenser Condenser clogged Replace condenser The A/C system does not function or functions intermittently because the refrigerant does not circulate. SYMPTOMS CHART Symptoms Probable Cause Diagnosis Corrective Actions Vacuum indicated on low pressure side, and extremely low pressure indicated on high pressure side Frost or condensation seen on piping on both sides of condenser or expansion valve Refrigerant flow obstructed by moisture or dirt in refrigeration system Refrigerant flow obstructed by gas leakage from expansion valve Refrigerant does not circulate Check expansion valve refrigerant Clean expansion valve by blowing air Replace condenser Evacuate air and charge appropriate volume of new refrigerant For gas leakage from expansion valve, replace expansion valve The A/C system does not function effectively due to overcharged refrigerant or insufficient cooling of the condenser. SYMPTOMS CHART Symptoms Probable Cause Diagnosis Corrective Actions Pressure extremely high on both low and high-pressure sides Excessive refrigerant Cooling performance of condenser insufficient Condenser is dirty Condenser fan motor is malfunctioning Excessive refrigerant Clean condenser Check condenser fan motor operation If 1 and 2 normal, check the amount of refrigerant and supply appropriate volume of refrigerant The A/C system does not function due to air in the refrigeration system. CAUTION: The low-pressure piping may be very hot and cause serious burns. SYMPTOMS CHART Symptoms Probable Cause Diagnosis Corrective Actions Pressure extremely high on both low and high-pressure sides Low-pressure piping is too hot to touch Air in refrigeration system Air in refrigeration system Vacuum purging insufficient Check if compressor oil is dirty or insufficient Evacuate air and charge new refrigerant The A/C system does not function effectively due to an expansion valve malfunction. SYMPTOMS CHART Symptoms Probable Cause Diagnosis Corrective Actions Pressure extremely high on both low and high-pressure sides Frost or condensation on piping on low-pressure side Problem with expansion valve Excessive refrigerant in low pressure piping Expansion valve too wide open Replace expansion valve The A/C system does not function due to a defective compressor. SYMPTOMS CHART Symptoms Probable Cause Diagnosis Corrective Actions Pressure extremely high on both low and high-pressure sides Pressure extremely low on high pressure side Internal leakage in compressor Compression failure Leakage from damaged valve or broken sliding parts Repair or replace compressor

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1. RECOVER REFRIGERANT FROM REFRIGERATION SYSTEM Start up the engine. Turn the A/C switch ON. Operate the cooler compressor with an engine speed of approximately 1,000 rpm for 5 to 6 minutes to circulate the refrigerant and collect the compressor oil remaining in each component into the cooler compressor. Stop the engine. Recover the refrigerant from the A/C system using a refrigerant recovery unit. SST 07110-58060 (07117-58060, 07117-58070, 07117-58080, 07117-58090, 07117-78050, 07117-88060, 07117-88070, 07117-88080)
2. ADD COMPRESSOR OIL When performing work on air conditioning parts, follow the oil guidelines below in order to protect the cooler compressor. PART AND CONDITION REFERENCE CHART Part and Condition Oil Level (cc) Work Procedure Compressor replacement -100 to -120 Drain oil from new compressor Condenser replacement 35 to 55 Fill oil into replacement part Evaporator replacement 40 to 60 A/C pipe replacement High pressure 5 to 25 Low pressure When discharging refrigerant gas quickly 30 to 50 While applying vacuum, use manifold gauge to fill oil from low pressure side valve
3. CHARGE REFRIGERANT Perform vacuum purging using a vacuum pump. Charge refrigerant HFC-134a (R134a). Standard: w/o Rear cooler 600 +/- 50g (21.2 +/- 1.8oz.) w/ Rear cooler 750 +/- 50g (26.5 +/- 1.8oz.) SST 07110-58060 (07117-58060, 07117-58070, 07117-58080, 07117-58090, 07117-78050, 07117-88060, 07117-88070, 07117-88080) NOTE: Do not operate the cooler compressor before charging refrigerant as the cooler compressor will not work properly without any refrigerant, and will overheat. Approximately 200 g (7.05 oz.) of refrigerant may need to be charged after bubbles disappear. The refrigerant amount should be checked by measuring its quantity, and not with the sight glass.
4. WARM UP ENGINE Warm up the engine at less than 1850 rpm for 2 minutes or more after charging the refrigerant. NOTE: Be sure to warm up the compressor when turning the A/C switch ON after removing and installing the cooler refrigerant lines (including the compressor), to prevent damage to the compressor.
5. CHECK FOR LEAKAGE OF REFRIGERANT After recharging the refrigerant gas, check for refrigerant gas leakage using a halogen leak detector. Perform the operation under these conditions: Stop the engine. Secure good ventilation (the halogen leak detector may react to volatile gases other than refrigerant, such as evaporated gasoline or exhaust gas). Repeat the test 2 or 3 times. Make sure that some refrigerant remains in the refrigeration system. When compressor is off: approximately 392 to 588 kPa (4 to 6 kgf/cm 2 , 57 to 85 psi) Using a halogen leak detector, check the refrigerant line for leakage. If a gas leak is not detected on the drain hose, remove the blower motor control (blower resistor) from the cooling unit. Insert the halogen leak detector sensor into the unit and perform the test. Disconnect the connector and leave the pressure switch on for approximately 20 minutes. Bring the halogen leak detector close to the pressure switch and perform the test.

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1. RECOVER REFRIGERANT FROM REFRIGERATION SYSTEM (See «REPLACEMENT» )
2. REMOVE COWL TOP VENTILATOR LOUVER RH (See «REMOVAL» )
3. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL CAUTION: Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to prevent airbag and seat belt pretensioner activation. NOTE: After the engine switch is turned off, the HDD navigation system requires approximately 6 minutes to record various types of memory and settings. As a result, after turning the engine switch off, wait 6 minutes or more before disconnecting the cable from the negative (-) battery terminal.
4. REMOVE TUBE SUB-ASSEMBLY Remove the bolt. Remove plate, as shown in the illustration. Disconnect the suction tube and liquid tube. NOTE: Do not use a screwdriver or similar tool to disconnect the tube. Seal the opening of the disconnected parts using vinyl tape to prevent moisture and foreign matter from entering them. Remove the 2 O-rings from the suction tube and liquid tube.
5. DISCONNECT INLET HEATER WATER HOSE Using pliers, grip the claws of the clip and slide the clip. Disconnect the heater water inlet hose.
6. DISCONNECT OUTLET HEATER WATER HOSE HINT: Disconnection of the heater water outlet hose is the same as for the heater water inlet hose.
7. REMOVE INSTRUMENT PANEL SAFETY PAD Remove the instrument panel safety pad (see «REMOVAL» ).
8. REMOVE AIR DUCT Remove the bolt. Detach the 2 claws and remove the duct.
9. REMOVE AIR DUCT Remove the screw. Detach the 2 claws and remove the duct.
10. REMOVE STEERING COLUMN ASSEMBLY Remove the steering column (see «REMOVAL» ).
11. REMOVE WINDSHIELD WIPER MOTOR ASSEMBLY Remove the windshield wiper motor (see «REMOVAL» ).
12. REMOVE INSTRUMENT PANEL REINFORCEMENT ASSEMBLY Disconnect the clamps, connectors and wire harness. Remove the bolts and nuts, and disconnect the ground wire and junction block. Remove the 9 bolts and 2 screws. Using a T40 "TORX" socket, remove the 2 "TORX" bolts (passenger side) and 3 bolts (driver side). HINT: The "TORX" bolts on the passenger side can be removed with the collar for adjustment. Passenger side: Using a 12 mm hexagon wrench, remove the 2 collars and instrument panel reinforcement with spacer.
13. REMOVE AIR CONDITIONING UNIT Remove the nut and air conditioning unit.

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1. REMOVE BLOWER ASSEMBLY Remove the screw. Disconnect the connector. Detach the claw and remove the blower unit.
2. REMOVE DRAIN COOLER HOSE Remove the 2 drain hoses.
3. REMOVE AIR DUCT LH Detach the 4 claws and remove the duct.
4. REMOVE AIR DUCT RH Detach the 4 claws and remove the duct.
5. REMOVE COOL AIR BYPASS SERVO MOTOR LH Disconnect the connector. Remove the 2 screws and damper servo.
6. REMOVE COOL AIR BYPASS SERVO MOTOR RH Disconnect the connector. Remove the 2 screws and damper servo.
7. REMOVE AIR MIX SERVO MOTOR LH (Cool) Disconnect the connector. Remove the 2 screws and damper servo.
8. REMOVE AIR MIX SERVO MOTOR RH (Cool) Disconnect the connector. Remove the 2 screws and damper servo.
9. REMOVE AIR OUTLET SERVO MOTOR LH (Face) Detach the 3 claws and remove the lever. Disconnect the connector. Remove the 2 screws and damper servo.
10. REMOVE AIR OUTLET SERVO MOTOR RH (Face) Detach the claw and remove the lever. Disconnect the connector. Remove the 2 screws and damper servo.
11. REMOVE REAR MODE SERVO MOTOR LH Disconnect the connector. Remove the 2 screws and damper servo.
12. REMOVE REAR MODE SERVO MOTOR RH Disconnect the connector. Remove the 2 screws and damper servo.
13. REMOVE REAR AIR MIX SERVO MOTOR LH Disconnect the connector. Remove the 2 screws and damper servo.
14. REMOVE REAR AIR MIX SERVO MOTOR RH Disconnect the connector. Remove the 2 screws and damper servo.
15. REMOVE AIR MIX SERVO MOTOR LH (Hot) Disconnect the connector. Remove the 2 screws and damper servo.
16. REMOVE AIR MIX SERVO MOTOR RH (Hot) Disconnect the connector. Remove the 2 screws and damper servo.
17. REMOVE HOT AIR BYPASS SERVO MOTOR Disconnect the connector. Remove the 2 screws and damper servo.
18. REMOVE FRONT FOOT/DEF SERVO MOTOR LH Detach the claw and remove the main plate. Disconnect the connector. Remove the 3 screws and damper servo.
19. REMOVE FRONT FOOT/DEF SERVO MOTOR RH Detach the claw and remove the main plate. Disconnect the connector. Remove the 3 screws and damper servo.
20. REMOVE PTC HEATER ASSEMBLY (w/ PTC Heater) Remove the 2 screws. Detach the 3 clamps and remove the PTC heater.
21. REMOVE AIR CONDITIONER HARNESS
22. REMOVE AIR CONDITIONER RADIATOR ASSEMBLY Remove the screw and bracket. Remove the radiator, as shown in the illustration.
23. REMOVE EVAPORATOR SUB-ASSEMBLY Remove the butyl tape and packing from the A/C tube. Remove the 6 screws. Detach the 3 claws and remove the front cooling unit case. Remove the evaporator.
24. REMOVE AIR CONDITIONER THERMISTOR ASSEMBLY Detach the clamp and remove the thermistor.
25. REMOVE NO. 1 EXPANSION VALVE Using a 4 mm hexagon wrench, remove the 2 hexagon bolts and A/C tube. Remove the 2 O-rings from the A/C tube. Remove the cooler expansion valve from the evaporator.
26. REMOVE REAR COOL AIR BYPASS SERVO MOTOR Remove the 3 screws and damper servo.

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1. INSTALL REAR COOL AIR BYPASS SERVO MOTOR Install the damper servo with the 3 screws.
2. INSTALL NO. 1 EXPANSION VALVE Sufficiently apply compressor oil to 4 new O-rings and the fitting surface of the cooler evaporator. Compressor oil: ND-OIL8 or equivalent Install the 2 O-rings on the evaporator. Install the 2 O-rings on the A/C tube. Install the expansion valve and A/C tube to the evaporator. Using a 4 mm hexagon wrench, install the A/C tube with the 2 hexagon bolts. Torque: 3.5 N*m (35 kgf*cm, 30 in.*lbf)
3. INSTALL AIR CONDITIONER THERMISTOR ASSEMBLY NOTE: If reusing the evaporator, do not insert the sensor into a location where the sensor was previously inserted. Insert the sensor within range C shown in the illustration. Install the sensor as shown in the illustration. AREA DIMENSION CHART Area Standard Dimension a 25 mm (0.984 in.) b 154 mm (6.630 in.) c 33.3 mm (1.1311 in.) d 50 mm (1.969 in.) Attach the clamp.
4. INSTALL EVAPORATOR SUB-ASSEMBLY Install the evaporator. Attach the 3 claws to install the front cooling unit case. Install the 6 screws. Install new butyl tape and packing.
5. INSTALL AIR CONDITIONER RADIATOR ASSEMBLY Install the radiator. Install the bracket with the screw.
6. INSTALL AIR CONDITIONER HARNESS
7. INSTALL PTC HEATER ASSEMBLY (w/ PTC Heater) Attach the 3 clamps to install the PTC heater. Install the 2 screws.
8. INSTALL FRONT FOOT/DEF SERVO MOTOR LH Install the damper servo with the 3 screws. Connect the connector. Attach the claw to install the main plate, as shown in the illustration.
9. INSTALL FRONT FOOT/DEF SERVO MOTOR RH Install the damper servo with the 3 screws. Connect the connector. Attach the claw to install the main plate.
10. INSTALL HOT AIR BYPASS SERVO MOTOR Align the protruding parts on the case and cover, install the damper servo with the 2 screws. Connect the connector.
11. INSTALL AIR MIX SERVO MOTOR LH (Hot) Make sure that the rod dose not rotate further by trying to rotate it clockwise. Install the damper servo with the 2 screws. Connect the connector.
12. INSTALL AIR MIX SERVO MOTOR RH (Hot) Make sure that the rod does not rotate further by trying to rotate it clockwise. Install the damper servo with the 2 screws. Connect the connector.
13. INSTALL REAR AIR MIX SERVO MOTOR LH Align the protruding parts on the case and cover, install the damper servo with the 2 screws. Connect the connector.
14. INSTALL REAR AIR MIX SERVO MOTOR RH Align the protruding parts on the case and cover, install the damper servo with the 2 screws. Connect the connector.
15. INSTALL REAR MODE SERVO MOTOR LH Set the lever onto the stopper, as shown in the illustration. Install the damper servo with the 2 screws. Connect the connector.
16. INSTALL REAR MODE SERVO MOTOR RH Set the lever onto the stopper, as shown in the illustration. Install the damper servo with the 2 screws. Connect the connector.
17. INSTALL AIR OUTLET SERVO MOTOR LH (Face) Install the damper servo with the 2 screws. Connect the connector. Set the lever so that the cutout part engages with a tooth of the gear, and then attach the 3 claws to install the lever.
18. INSTALL AIR OUTLET SERVO MOTOR RH (Face) Install the damper servo with the 2 screws. Connect the connector. Set the lever so that the cutout part engages with a tooth of the gear, attach the claw to install the lever.
19. INSTALL AIR MIX SERVO MOTOR LH (Cool) Make sure that the rod does not rotate further by trying to rotate it clockwise. Install the damper servo with the 2 screws. Connect the connector.
20. INSTALL AIR MIX SERVO MOTOR RH (Cool) Make sure that the rod does not rotate further by trying to rotate it clockwise. Install the damper servo with the 2 screws. Connect the connector.
21. INSTALL COOL AIR BYPASS SERVO MOTOR LH Set the lever so that the cutout part engages with a tooth of the gear, install the damper servo with the 2 screws. Connect the connector.
22. INSTALL COOL AIR BYPASS SERVO MOTOR RH Set the lever so that the cutout part engages with a tooth of the gear, install the damper servo with the 2 screws. Connect the connector.
23. INSTALL AIR DUCT LH Attach the 4 claws to install the duct.
24. INSTALL AIR DUCT RH Attach the 4 claws to install the duct.
25. INSTALL DRAIN COOLER HOSE Install the 2 drain hoses, as shown in the illustration.
26. INSTALL BLOWER ASSEMBLY Attach the claw to install the blower unit. Connect the connector. Install the screw.

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1. INSTALL AIR CONDITIONING UNIT ASSEMBLY Install the air conditioning unit with the nut. Torque: 9.8 N*m (100 kgf*cm, 7 ft.*lbf)
2. INSTALL INSTRUMENT PANEL REINFORCEMENT ASSEMBLY Install the instrument panel reinforcement with spacer. Using a T40 "TORX" socket, install the 2 "TORX" bolts (passenger side) and 3 bolts (driver side). Torque: 20 N*m (204 kgf*cm, 15 ft.*lbf) Passenger side: Using a 12 mm hexagon wrench, install the 2 collars. Torque: 20 N*m (204 kgf*cm, 15 ft.*lbf) Install the 9 bolts and 2 screws. Install the ground wires and junction block with the bolts and nuts. Attach the clamps and connectors to the wire harness.
3. INSTALL WINDSHIELD WIPER MOTOR ASSEMBLY Install the windshield wiper motor (see «INSTALLATION» ).
4. INSTALL STEERING COLUMN ASSEMBLY Install the steering column (see «INSTALLATION» ).
5. INSTALL AIR DUCT Attach the 2 claws to install the duct. Install the screw.
6. INSTALL AIR DUCT Attach the 2 claws to install the duct. Install the bolt. Torque: 9.8 N*m (100 kgf*cm, 7 ft.*lbf)
7. INSTALL INSTRUMENT PANEL SAFETY PAD Install the instrument panel safety pad (see «INSTALLATION» ).
8. CONNECT HEATER WATER OUTLET HOSE Connect the water hose and attach the clip.
9. CONNECT HEATER WATER INLET HOSE HINT: Use the same procedures described for the water outlet hose.
10. CONNECT TUBE SUB-ASSEMBLY Remove the attached vinyl tape from the pipe. Sufficiently apply compressor oil to 2 new O-rings and the fitting surface of the suction tube and liquid tube. Compressor oil: ND-OIL 8 or equivalent Install the 2 O-rings on the suction tube and liquid tube. Connect the suction tube and liquid tube. HINT: After the connection, check that the claw of the piping clamp is engaged. Install the plate with the bolt. Torque: 9.8 N*m (100 kgf*cm, 7 ft.*lbf)
11. CONNECT CABLE TO NEGATIVE BATTERY TERMINAL
12. INSTALL COWL TOP VENTILATOR LOUVER RH (See «INSTALLATION» )
13. ADD ENGINE COOLANT (See «REPLACEMENT»(/lexus/ls/iv-2006-2012/remont/cooling-system-mechanical/#cooling) )
14. ADD COMPRESSOR OIL (See «REPLACEMENT» )
15. CHARGE REFRIGERANT (See «REPLACEMENT» )
16. WARM UP ENGINE (See «REPLACEMENT» )
17. CHECK FOR ENGINE COOLANT LEAKS (See «ON-VEHICLE INSPECTION»(/lexus/ls/iv-2006-2012/remont/cooling-system-mechanical/#cooling) )
18. CHECK FOR LEAKAGE OF REFRIGERANT (See «REPLACEMENT» )
19. CHECK SRS WARNING LIGHT Check the SRS warning light (see «DIAGNOSIS SYSTEM»(/lexus/ls/iv-2006-2012/remont/airbag/#supplemental-restraint-system) ).
20. PERFORM INITIALIZATION Perform initialization (see «INITIALIZATION» ). NOTE: Certain systems need to be initialized after disconnecting and reconnecting the cable from the negative (-) battery terminal.

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1. RECOVER REFRIGERANT FROM REFRIGERATION SYSTEM (See «REPLACEMENT» )
2. REMOVE COWL TOP VENTILATOR LOUVER RH (See «REMOVAL» )
3. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL CAUTION: Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to prevent airbag and seat belt pretensioner activation. NOTE: After the engine switch is turned off, the HDD navigation system requires approximately 6 minutes to record various types of memory and settings. As a result, after turning the engine switch off, wait 6 minutes or more before disconnecting the cable from the negative (-) battery terminal.
4. DISCONNECT AIR CONDITIONING TUBE AND ACCESSORY ASSEMBLY Detach the 3 claws and remove the cover. Remove the 2 bolts and disconnect the 2 tubes. Remove the 2 O-rings from the 2 tubes.
5. REMOVE REAR SEAT ASSEMBLY (for Power Seat) Remove the rear seat (see «REMOVAL»(/lexus/ls/iv-2006-2012/remont/seats/#seat) ).
6. REMOVE REAR SEAT ASSEMBLY (for Ottoman) Remove the rear seat (see «REMOVAL»(/lexus/ls/iv-2006-2012/remont/seats/#seat) ).
7. REMOVE REAR SEAT ASSEMBLY (for Fixed Type) Remove the rear seat (see «REMOVAL»(/lexus/ls/iv-2006-2012/remont/seats/#seat) ).
8. REMOVE REAR DOOR SCUFF PLATE LH for Standard Body: Remove the rear door scuff plate (see «REMOVAL» ). for Long Body: Remove the rear door scuff plate (see «REMOVAL» ).
9. REMOVE REAR DOOR SCUFF PLATE RH for Standard Body: Remove the rear door scuff plate (see «REMOVAL» ). for Long Body: Remove the rear door scuff plate (see «REMOVAL» ).
10. REMOVE REAR SEAT SIDE GARNISH LH for Standard Body: Remove the rear seat side garnish (see «REMOVAL» ). for Long Body: Remove the rear seat side garnish (see «REMOVAL» ).
11. REMOVE REAR SEAT SIDE GARNISH RH for Standard Body: Remove the rear seat side garnish (see «REMOVAL» ). for Long Body: Remove the rear seat side garnish (see «REMOVAL» ).
12. REMOVE ROOF SIDE GARNISH INNER LH for Standard Body: Remove the roof side garnish inner (see «REMOVAL» ). for Long Body: Remove the roof side garnish inner (see «REMOVAL» ).
13. REMOVE ROOF SIDE GARNISH INNER RH for Standard Body: Remove the roof side garnish inner (see «REMOVAL» ). for Long Body: Remove the roof side garnish inner (see «REMOVAL» ).
14. REMOVE PACKAGE TRAY TRIM PANEL ASSEMBLY w/ Rear Sunshade: Remove the package tray trim panel (see «REMOVAL» ). w/o Rear Sunshade: Remove the package tray trim panel (see «REMOVAL» ).
15. REMOVE NO. 1 COOLER COVER Detach the 2 clips and remove the cover.
16. REMOVE LUGGAGE COMPARTMENT MAT SUB-ASSEMBLY (See «REMOVAL» )
17. REMOVE ROPE HOOK ASSEMBLY (See «REMOVAL» )
18. REMOVE ROPE HOOK (See «REMOVAL» )
19. REMOVE DECK TRIM SIDE BOARD LH (See «REMOVAL» )
20. REMOVE DECK TRIM SIDE BOARD RH (See «REMOVAL» )
21. REMOVE NO. 1 LUGGAGE COMPARTMENT LIGHT ASSEMBLY (See «REMOVAL» )
22. REMOVE LUGGAGE COMPARTMENT TRIM COVER SUB-ASSEMBLY FRONT (See «REMOVAL» )
23. REMOVE DECK BOARD ASSEMBLY (w/o Spare Tire)
24. REMOVE TOOL BOX (w/o Spare Tire)
25. REMOVE REAR FLOOR FINISH PLATE (See «REMOVAL» )
26. REMOVE LUGGAGE COMPARTMENT TRIM COVER ASSEMBLY LH (See «REMOVAL» )
27. REMOVE LUGGAGE COMPARTMENT TRIM COVER ASSEMBLY RH (See «REMOVAL» )
28. REMOVE ROOF SIDE NO. 2 AIR DUCT LH Remove the clip. Detach the 2 claws and remove the duct.
29. REMOVE ROOF SIDE NO. 2 AIR DUCT RH Remove the clip. Detach the 2 claws and remove the duct.
30. REMOVE REAR NO. 4 AIR DUCT Detach the 4 claws and remove the duct.
31. REMOVE REAR NO. 5 AIR DUCT Detach the 4 claws and remove the duct.
32. REMOVE NO. 1 COOLER AIR DUCT Detach the 2 claws and remove the duct.
33. REMOVE NO. 2 COOLER AIR DUCT Detach the 3 claws and remove the duct.
34. REMOVE REAR COOLING UNIT ASSEMBLY Disconnect the clamp and connector. Remove the 4 bolts and rear cooling unit.

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Scheme 239

1. REMOVE NO. 1 COOLER AIR DUCT Remove the 2 screws and duct.
2. REMOVE NO. 2 COOLER AIR DUCT Remove the 2 screws and duct.
3. REMOVE REAR COOLER FILTER Remove the rear cooler filter.
4. REMOVE COOLER REFRIGERANT LIQUID PIPE A Remove the packing and butyl tape. Using a 4 mm hexagon wrench, remove the 2 hexagon bolts. Remove the screw and plate. Remove the cooler refrigerant liquid pipe A. Remove the 2 O-rings from the cooler refrigerant liquid pipe A.
5. REMOVE REAR COOLING UNIT EXPANSION VALVE Disconnect the connector. Detach the clamp. Remove the expansion valve from the cooler refrigerant suction pipe A.
6. REMOVE COOLER REFRIGERANT SUCTION PIPE A Using a 4 mm hexagon wrench, remove the 2 hexagon bolts. Remove the cooler refrigerant suction pipe A. Remove the 2 O-rings from the cooler refrigerant suction pipe A.
7. REMOVE ROOF BLOWER DAMPER SERVO SUB-ASSEMBLY Disconnect the connector. Remove the 2 screws and damper servo.
8. REMOVE ROOF BLOWER DAMPER SERVO SUB-ASSEMBLY Disconnect the connector. Remove the 2 screws and damper servo.
9. REMOVE DIFFUSE MODE DAMPER SERVO SUB-ASSEMBLY Disconnect the connector. Remove the 2 screws and damper servo.
10. REMOVE EXHAUST MODE DAMPER SERVO SUB-ASSEMBLY Disconnect the connector. Remove the 3 screws and damper servo.
11. REMOVE SMOKE SENSOR Disconnect the connector. Remove the screw and sensor.
12. REMOVE BLOWER WITH FAN (REAR) MOTOR SUB-ASSEMBLY Disconnect the connector. Remove the 3 screws and motor.
13. REMOVE DRAIN COOLER HOSE Remove the drain cooler hose as indicated by the arrow in the illustration.
14. REMOVE AIR CONDITIONER HARNESS Detach the 2 clamps and remove the wire harness.
15. REMOVE EVAPORATOR SUB-ASSEMBLY (REAR) Remove the 4 screws and evaporator cover. Remove the 12 screws and rear cooling unit case (lower side). Remove the evaporator. Remove the 2 O-rings from the evaporator.

Scheme 240

1. INSPECT SMOKE SENSOR Connect the positive (+) lead of the battery to terminal 3, and the negative (-) lead to terminal 1. NOTE: After connecting the battery to the terminals of the smoke sensor, wait 35 seconds or more before performing the smoke sensor inspection. Measure the voltage according to the value(s) in the table below. Standard voltage VOLTAGE REFERENCE CHART Tester Connection Condition Specified Condition 1 - 2 Without smoke Below 1 V 1 - 2 With smoke 4 V or higher NOTE: Perform the inspection with the sensor in a dark place, as the sensor uses light to detect smoke. Perform the inspection after applying tobacco smoke for 26 seconds or more to the sensor. If the result is not as specified, replace the sensor.

Scheme 241

Scheme 242

Scheme 243

1. INSTALL EVAPORATOR SUB-ASSEMBLY (REAR) Sufficiently apply compressor oil to 2 new O-rings and the fitting surface of the hose joint. Compressor oil: ND-OIL 8 or equivalent Install the 2 O-rings to the evaporator. Install the evaporator. Install the rear cooling unit case (lower side) with the 12 screws. Install the evaporator cover with the 4 screws.
2. INSTALL AIR CONDITIONER HARNESS Attach the 2 clamps to install the wire harness.
3. INSTALL DRAIN COOLER HOSE Install the drain cooler hose as shown in the illustration.
4. INSTALL BLOWER WITH FAN (REAR) MOTOR SUB-ASSEMBLY Install the motor with the 3 screws. Connect the connector.
5. INSTALL SMOKE SENSOR Install the sensor with the screw. Connect the connector.
6. INSTALL EXHAUST MODE DAMPER SERVO SUB-ASSEMBLY Install the damper servo with the 3 screws. Connect the connector.
7. INSTALL DIFFUSE MODE DAMPER SERVO SUB-ASSEMBLY Install the damper servo with the 2 screws. Connect the connector.
8. INSTALL ROOF BLOWER DAMPER SERVO SUB-ASSEMBLY Install the damper servo with the 2 screws. Connect the connector.
9. INSTALL ROOF BLOWER DAMPER SERVO SUB-ASSEMBLY Install the damper servo with the 2 screws. Connect the connector.
10. INSTALL COOLER REFRIGERANT SUCTION PIPE A Sufficiently apply compressor oil to 2 new O-rings and the fitting surface of the pipe joint. Compressor oil: ND-OIL 8 or equivalent Install the 2 O-rings to the cooler refrigerant suction pipe A. Install the cooler refrigerant suction pipe A to the evaporator. Using a 4 mm hexagon wrench, install the 2 hexagon bolts. Torque: 3.5 N*m (35 kgf*cm, 30 in.*lbf)
11. INSTALL REAR COOLING UNIT EXPANSION VALVE Install the expansion valve to the cooler refrigerant suction pipe A. Attach the clamp. Connect the connector.
12. INSTALL COOLER REFRIGERANT LIQUID PIPE A Sufficiently apply compressor oil to 2 new O-rings and the fitting surface of the pipe joint. Compressor oil: ND-OIL 8 or equivalent Install the 2 O-rings to the cooler refrigerant liquid pipe A. Install the cooler refrigerant liquid pipe A to the expansion valve. Using a 4 mm hexagon wrench, install the 2 hexagon bolts. Torque: 3.5 N*m (35 kgf*cm, 30 in.*lbf) Install the plate with the screw. Install new packing and butyl tape as shown in the illustration.
13. INSTALL REAR COOLER FILTER Install the rear cooler filter as shown in the illustration.
14. INSTALL NO. 2 COOLER AIR DUCT Install the duct with the 2 screws.
15. INSTALL NO. 1 COOLER AIR DUCT Install the duct with the 2 screws.

Scheme 244

1. INSTALL REAR COOLING UNIT ASSEMBLY Install the cooling unit with the 4 bolts. Torque: 9.8 N*m (100 kgf*cm, 7 ft.*lbf) NOTE: When installing the drain hose, make sure the marking is as shown in the illustration. Connect the clamp and connector.
2. CONNECT AIR CONDITIONING TUBE AND ACCESSORY ASSEMBLY Sufficiently apply compressor oil to 2 new O-rings and the fitting surface of the tube. Compressor oil: ND-OIL 8 or equivalent Install the 2 O-rings to the tube. Connect the 2 tubes with the 2 bolts. Torque: 9.8 N*m (100 kgf*cm, 7 ft.*lbf) Attach the 3 claws to install the cover.
3. INSTALL NO. 2 COOLER AIR DUCT Attach the 3 claws to install the duct.
4. INSTALL NO. 1 COOLER AIR DUCT Attach the 2 claws to install the duct.
5. INSTALL REAR NO. 4 AIR DUCT Attach the 4 claws to install the duct.
6. INSTALL REAR NO. 5 AIR DUCT Attach the 4 claws to install the duct.
7. INSTALL ROOF SIDE NO. 2 AIR DUCT LH Attach the 2 claws to install the duct. Install the clip.
8. INSTALL ROOF SIDE NO. 2 AIR DUCT RH Attach the 2 claws to install the duct. Install the clip.
9. INSTALL LUGGAGE COMPARTMENT TRIM COVER ASSEMBLY LH (See «INSTALLATION» )
10. INSTALL LUGGAGE COMPARTMENT TRIM COVER ASSEMBLY RH (See «INSTALLATION» )
11. INSTALL REAR FLOOR FINISH PLATE (See «INSTALLATION» )
12. INSTALL TOOL BOX (w/o Spare Tire)
13. INSTALL DECK BOARD ASSEMBLY (w/o Spare Tire)
14. INSTALL LUGGAGE COMPARTMENT TRIM COVER SUB-ASSEMBLY FRONT (See «INSTALLATION» )
15. INSTALL NO. 1 LUGGAGE COMPARTMENT LIGHT ASSEMBLY (See «INSTALLATION» )
16. INSTALL DECK TRIM SIDE BOARD LH (See «INSTALLATION» )
17. INSTALL DECK TRIM SIDE BOARD RH (See «INSTALLATION» )
18. INSTALL ROPE HOOK (See «INSTALLATION» )
19. INSTALL ROPE HOOK ASSEMBLY (See «INSTALLATION» )
20. INSTALL LUGGAGE COMPARTMENT MAT SUB-ASSEMBLY (See «INSTALLATION» )
21. INSTALL NO. 1 COOLER COVER Attach the 2 clips to install the cover.
22. INSTALL PACKAGE TRAY TRIM PANEL ASSEMBLY w/ Rear Sunshade: Install the package tray trim panel (see «INSTALLATION» ). w/o Rear Sunshade: Install the package tray trim panel (see «INSTALLATION» ).
23. INSTALL ROOF SIDE GARNISH INNER LH for Standard Body: Install the roof side garnish inner (see «INSTALLATION» ). for Long Body: Install the roof side garnish inner (see «INSTALLATION» ).
24. INSTALL ROOF SIDE GARNISH INNER RH for Standard Body: Install the roof side garnish inner (see «INSTALLATION» ). for Long Body: Install the roof side garnish inner (see «INSTALLATION» ).
25. INSTALL REAR SEAT SIDE GARNISH LH for Standard Body: Install the rear seat side garnish (see «INSTALLATION» ). for Long Body: Install the rear seat side garnish (see «INSTALLATION» ).
26. INSTALL REAR SEAT SIDE GARNISH RH for Standard Body: Install the rear seat side garnish (see «INSTALLATION» ). for Long Body: Install the rear seat side garnish (see «INSTALLATION» ).
27. INSTALL REAR DOOR SCUFF PLATE LH for Standard Body: Install the rear door scuff plate (see «INSTALLATION» ). for Long Body: Install the rear door scuff plate (see «INSTALLATION» ).
28. INSTALL REAR DOOR SCUFF PLATE RH for Standard Body: Install the rear door scuff plate (see «INSTALLATION» ). for Long Body: Install the rear door scuff plate (see «INSTALLATION» ).
29. INSTALL REAR SEAT ASSEMBLY (for Power Seat) Install the rear seat assembly (see «INSTALLATION»(/lexus/ls/iv-2006-2012/remont/seats/#seat) ).
30. INSTALL REAR SEAT ASSEMBLY (for Ottoman) Install the rear seat assembly (see «INSTALLATION»(/lexus/ls/iv-2006-2012/remont/seats/#seat) ).
31. INSTALL REAR SEAT ASSEMBLY (for Fixed Type) Install the rear seat assembly (see «INSTALLATION»(/lexus/ls/iv-2006-2012/remont/seats/#seat) ).
32. CONNECT CABLE TO NEGATIVE BATTERY TERMINAL
33. INSTALL COWL TOP VENTILATOR LOUVER RH (See «INSTALLATION» )
34. ADD COMPRESSOR OIL (See «REPLACEMENT» )
35. CHARGE REFRIGERANT (See «REPLACEMENT» )
36. WARM UP ENGINE (See «REPLACEMENT» )
37. CHECK FOR LEAKAGE OF REFRIGERANT (See «REPLACEMENT» )
38. CHECK SRS WARNING LIGHT Check the SRS warning light (see «DIAGNOSIS SYSTEM»(/lexus/ls/iv-2006-2012/remont/airbag/#supplemental-restraint-system) ).
39. PERFORM INITIALIZATION Perform initialization (see «INITIALIZATION» ). NOTE: Certain systems need to be initialized after disconnecting and reconnecting the cable from the negative (-) battery terminal.

Scheme 245

Scheme 246

Scheme 247

Scheme 248

1. REMOVE AIR CONDITIONING UNIT Remove the air conditioning unit (see «REMOVAL» ).
2. REMOVE BLOWER ASSEMBLY Remove the screw. Disconnect the connector. Detach the claw and remove the blower unit.
3. REMOVE DAMPER SERVO SUB-ASSEMBLY Remove the 3 screws and damper servo.
4. REMOVE BLOWER WITH FAN MOTOR SUB-ASSEMBLY Remove the 3 screws and motor.
5. REMOVE AIR FILTER Detach the 2 claws and remove the filter.

See also:
• HOW TO PROCEED WITH TROUBLESHOOTING
• REMOVAL
• REPLACEMENT
• DIAGNOSIS SYSTEM
• REMOVAL
• REMOVAL
• REMOVAL
• INSTALLATION