Air Conditioning: Diagnosis Lexus ES XV40

HOW TO PROCEED WITH TROUBLESHOOTING

HINT

1. Use the following procedures to troubleshoot the air conditioning system.
2. *: Use the intelligent tester.

1. VEHICLE BROUGHT TO WORKSHOP
2. INSPECT BATTERY VOLTAGE Inspect the battery voltage. Standard voltage: 11 to 14 V If the voltage is below 11 V, recharge or replace the battery before proceeding.
3. CHECK COMMUNICATION FUNCTION OF CAN COMMUNICATION SYSTEM* Use the intelligent tester to check if the CAN Communication System is functioning normally. Result COMMUNICATION FUNCTION OF CAN COMMUNICATION SYSTEM Result Proceed to CAN DTC is not output A CAN DTC Is output B B: Go to «CAN COMMUNICATION»(ref-283107) A: Go to Next Step
4. CHECK FOR DTC* Check for DTCs and note any codes that are output. Delete the DTCs. Recheck for DTCs. Based on the DTCs output above, try to force output of the A/C system DTC by simulating the operation indicated by the DTC. Result DTC RESULT CHART Result Proceed to DTC is not output A DTC is output B B: Go to step 7 A: Go to Next Step
5. PROBLEM SYMPTOMS TABLE Refer to the «PROBLEM SYMPTOMS TABLE»(ref-283108-S02001029892008041700000) . Result RESULT CHART Result Proceed to Fault is not listed in problem symptoms table A Fault is listed in problem symptoms table B B: Go to step 7 A: Go to Next Step
6. OVERALL ANALYSIS AND TROUBLESHOOTING* See «ACTUATOR CHECK»(ref-283108-S13664515932008041700000) See «DATA LIST / ACTIVE TEST»(ref-283108-S06039100452008041700000) See «TERMINALS OF ECU»(ref-283108-S12827432592008041700000) On-vehicle Inspection Inspection
7. ADJUST, REPAIR OR REPLACE NEXT: END

PROBLEM SYMPTOMS TABLE

AIR CONDITIONER

AIR CONDITIONER PROBLEM SYMPTOMS CHART

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1. A/C AMPLIFIER HINT: Check from the rear of the connector while it is connected to the A/C amplifier. A/C AMPLIFIER CHART Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition E1-1 (IG+) - E1-14 (GND) V-W - B Power source (IG) Engine switch on (IG) 10 to 14 V E1-1 (IG+) - E1-14 (GND) V-W - B Power source (IG) Engine switch off Below 1 V E1-2 (SOL+) - E1-14 (GND) W-W - B A/C compressor operation signal Engine is running A/C switch: ON Blower switch: LO Pulse generation (See a waveform 1) E1-5 (TAM) - E1-14 (GND) G-W - B A/C ambient temperature sensor signal Engine switch on (IG) at 25°C (77°F) 1.35 to 1.75 V E1-5 (TAM) - E1-14 (GND) G-W - B A/C ambient temperature sensor signal Engine switch on (IG) at 40°C (104°F) 0.9 to 1.2 V E1-6 (DGS) - E1-14 (GND) LG - W - B Exhaust gas sensor signal (HC, CO) After 30 seconds from engine switch on (IG) and sensor is exposed to exhaust gas. 1.0 to 4.5 V E1-7 (DGS1) - E1-14 (GND) P-W - B Exhaust gas sensor signal (NOx) After 30 seconds from engine switch on (IG) and sensor is exposed to exhaust gas. 1.0 to 4.5 V E1-8 (LOCK) - E1-14 (GND) G-W - B A/C compressor lock sensor signal Engine is running Blower switch: LO A/C switch: ON Pulse generation (See b waveform 2) E1-9 (PRE) - E1-13 (SG-2) R-L A/C pressure sensor signal Start engine, Operate A/C system, Refrigerant pressure: Abnormal pressure (more than 3,140 kPa (32.0 kgf/cm 2 , 455 psi)) 4.74 V or higher E1-9 (PRE) - E1-13 (SG-2) R - L A/C pressure sensor signal Start engine, Operate A/C system, Refrigerant pressure: Abnormal pressure (less than 196 kPa (2.0 kgf/cm 2 , 28 psi)) Below 0.76 V E1-9 (PRE) - E1-13 (SG-2) R - L A/C pressure sensor signal Start engine, Operate A/C system, Refrigerant pressure: Abnormal pressure (more than 3,140 kPa (32.0 kgf/cm 2 ,455 psi) or less than 196 kPa (2.0 kgf/cm 2 , 28 psi)) 0.76 to 4.74 V E1-10 (S5-3) - E1-13 (SG-2) G - L Power supply for A/C pressure sensor Engine switch on (IG) 4.5 to 5.5 V E1-11 (CANH) - E1-12 (CANL) GR - BR CAN communication system CAN communication circuit Pulse generation E1-13 (SG-2) - Body ground L - Body ground Ground for A/C pressure sensor, A/C ambient temperature sensor, A/C lock sensor Always Below 1 V E1-14 (GND) - Body ground W - B - Body ground Ground for main power supply Always Below 1 V E1-20 (MGC) - E1-14 (GND) B-W - B A/C compressor magnetic clutch operation signal Engine switch on (IG) Blower switch: LO A/C switch: OFF 10 to 14 V E1-20 (MGC) - E1-14 (GND) B-W - B A/C compressor magnetic clutch operation signal Engine switch on (IG) Blower switch: LO A/C switch: ON Below 1 V E1-21 (B) - E1-14 (GND) GR - W - B Power source (Back-up) Always 10 to 14 V E1-23 (BLW) - E1-14 (GND) R-W - B Blower motor speed control signal Engine switch on (IG) Blower switch: ON Pulse generation (See c waveform 3) E1-29 (TR) - E1-34 (SG-1) BR - LG A/C room temperature sensor signal Engine switch on (IG) Cabin temperature at 25°C (77°F) 1.8 to 2.2 V E1-29 (TR) - E1-34 (SG-1) BR - LG A/C room temperature sensor signal Engine switch on (IG) Cabin temperature at 40°C (104°F) 1.2 to 1.6 V E1-32 (TSP) - E1-14 (GND) Y-W - B A/C solar sensor signal (for Front passenger side) Engine switch on (IG) Solar sensor is subjected to electric light. 0.8 to 4.3 V E1-32 (TSP) - E1-14 (GND) Y-W - B A/C solar sensor signal (for Front passenger side) Engine switch on (IG) Solar sensor is covered with a cloth. Below 0.8 V E1-33 (TSD) - E1-14 (GND) O-W - B A/C solar sensor signal (for Driver side) Engine switch on (IG) Solar sensor is subjected to electric light. 0.8 to 4.3 V E1-33 (TSD) - E1-14 (GND) O-W - B A/C solar sensor signal (for Driver side) Engine switch on (IG) Solar sensor is covered with a cloth. Below 0.8 V E1-34 (SG-1) - Body ground LG - Body ground Ground for A/C room temperature sensor Always Below 1 V E1-37 (UN1) - E1-14 (GND) GR - W - B LIN communication signal Engine switch on (IG) Pulse generation E1-38 (RDFG) - E1-14 (GND) G-W - B DEF relay signal Engine switch on (IG) REAR DEF switch: ON Below 1 V E1-38 (RDFG) - E1-14 (GND) G-W - B DEF relay signal Engine switch on (IG) REAR DEF switch: OFF 10 to 14 V Y1-2 (BUS G) - Body ground - Ground for BUS IC Always Below 1 V Y1-3 (BUS) - Y1-2 (BUSG) - BUS IC control signal Engine switch off --> on (IG) Pulse generation Y1-4 (BBUS) - Y1-2 (BUSG) - Power supply for BUS IC Engine switch off Below 1 V Y1-4 (BBUS) - Y1-2 (BUSG) - Power supply for BUS IC Engine switch on (IG) 10 to 14 V Y1-5 (SG-3) - Body ground - Ground for evaporator temperature sensor Always Below 1 V Y1-6 (TEA) - Y1-5 (SG-3) - A/C evaporator temperature sensor signal Engine switch on (IG) Evaporator temperature at 0°C (32°F) 1.7 to 2.1 V Y1-6 (TEA) - Y1-5 (SG-3) - A/C evaporator temperature sensor signal Engine switch on (IG) Evaporator temperature at 15°C (59°F) 0.7 to 1.3 V Waveform 1: WAVEFORM 1 REFERENCE CHART Item Contents Terminal No. (Symbols) E1-2 (SOL+) - E1-14 (GND) Tool Setting 5 V/DIV., 500 μs./DIV. Vehicle Condition Engine is running A/C switch: ON Waveform 2: WAVEFORM 2 REFERENCE CHART Item Contents Terminal No. (Symbols) E1-8 (LOCK) - E1-14 (GND) Tool Setting 200mV/DIV., 10ms./DIV. Vehicle Condition Engine is running Blower switch: LO A/C switch: ON Waveform 3: WAVEFORM 3 REFERENCE CHART Item Contents Terminal No. (Symbols) E1-23 (BLW) - E1-14 (GND) Tool Setting 1 V/DIV., 500 μ./DIV. Vehicle Condition Engine switch on (IG) Blower switch: ON
2. A/C CONTROL ASSEMBLY HINT: Check from the rear of the connector while it is connected to the A/C control assembly. A/C CONTROL ASSEMBLY CHART Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition E3-1 (+B) - E3-18 (GND) GR - W - B Power source (Back-up) Always 10 to 14 V E3-2 (IG+) - E3-18 (GND) V-W - B Power source (IG) Engine switch off Below 1 V E3-2 (IG+) - E3-18 (GND) V-W - B Power source (IG) Engine switch on (IG) 10 to 14 V E3-10 (ACC) - E3-18 (GND) L-W - B Power source (ACC) Engine switch off Below 1 V E3-10 (ACC) - E3-18 (GND) L-W - B Power source (ACC) Engine switch on (ACC) 10 to 14 V E3-15 (TX+) - E3-18 (GND) GR - W - B LIN communication circuit Engine switch on (IG) Pulse generation E3-18 (GND) - Body ground W - B - Body ground Ground for A/C control assembly Always Below 1 V

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1. CHECK DLC3 The vehicle's ECU uses the ISO 15765-4 communication protocol. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 15765-4 format. DLC3 CONNECTOR TERMINALS CHART Symbol (Terminal No.) Terminal Description Condition Specified Condition SIL (7) - SG (5) Bus "+" line During transmission Pulse generation CG (4) - Body ground Chassis ground Always Below 1 ohms SG (5) - Body ground Signal ground Always Below 1 ohms BAT (16) - Body ground Battery positive Always 10 to 14 V CANH (6) - CANL (14) CAN bus line Engine switch off (1) 54 to 69 ohms CANH (6) - BAT (16) HIGH-level CAN bus line Engine switch off (1) 1 Mohms or higher CANH (6) - CG (4) HIGH-level CAN bus line Engine switch off (1) 1 kohms or higher CANL (14) -BAT (16) LOW-level CAN bus line Engine switch off 1 Mohms or higher CANL (14) - CG (4) LOW-level CAN bus line Engine switch off (1) 1 kohms or higher NOTE: (1) Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the engine switch, any other switches, or the doors. HINT: Connect the cable of the intelligent tester to the DLC3, turn the engine switch on (IG) and attempt to use the tester. If the display indicates that a communication error has occurred, there is a problem either with the vehicle or with the tester. If communication is normal when the tester is connected to another vehicle, inspect the DLC3 of the original vehicle. If communication is still not possible when the tester is connected to another vehicle, the problem may be in the tester itself. Consult the Service Department listed in the tester's instruction manual.

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1. DTC CHECK (SENSOR CHECK) Start the engine and warm it up. Perform the indicator check (See «CHECK MODE PROCEDURE»(ref-283108-S37472029562008041700000) ). HINT: After the indicator check is completed, the system enters the DTC check mode automatically. Read the DTC on the panel. NOTE: In the sensor check mode, which is automatically transferred from the indicator check mode, troubleshooting may be partially performed. Be sure to perform the actuator check, and then the sensor check again. If the check is performed in a dark place, DTC 21 or 24 may be displayed even though the system is normal. HINT: Refer to the «DTC CHART»(ref-283108-S06721167082008041700000) (Diagnostic Trouble Code chart) for details of the codes . When there are no problems, DTC 00 is output. As an example, the illustration shows that DTC 21 is output. If the steps are difficult to read because they change automatically, push the "UPDr" switch to display the steps one at a time so that they can be read easily. The items are displayed step by step each time the "UPDr" switch is pushed. HINT: Push the "OFF" switch to finish panel diagnosis. Push the "R/F" switch to enter the actuator check mode.
2. CLEARING DTC During the sensor check, press the "FRONT DEF" switch and "REAR DEF" switch at the same time.
3. DTC CHECK USING INTELLIGENT TESTER Connect the intelligent tester to the DLC3. Turn the engine switch on (IG). Turn the tester ON. Enter the following menu items: DIAGNOSIS / OBD/ MOBD / DTC INFO / CURRENT CODES. HINT: Refer to the intelligent tester operator's manual for further details. Check the details of the DTCs. Clear the DTCs. HINT: After repairing the malfunctions, clear the DTCs. Connect the intelligent tester to the DLC3. Turn the engine switch on (IG). Enter the following menu items: DIAGNOSIS / OBD/MOBD / DTC INFO / CLEAR CODES. HINT: Refer to the intelligent tester operator's manual for further details. Press the YES button.

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1. LIST OF OPERATION METHODS By operating each of the A/C control switches as shown in the diagram below, it is possible to enter the diagnostic check mode.
2. INDICATOR CHECK Turn the engine switch off. Turn the engine switch on (IG) while pressing the A/ C control "AUTO" switch and "R/F" switch simultaneously. Hold both switches until the indicator check screen appears. The indicator check is automatically performed when panel diagnosis is activated. Check that the indicators light up and go off at 1 second intervals 4 times in succession. HINT: The sensor check automatically starts when the indicator check is completed. Press the "OFF" switch to cancel the check mode. If a navigation system is installed, the indicator will blink and the buzzer will sound.
3. DTC CHECK (SENSOR CHECK) Start the engine and warm it up. Perform the indicator check. HINT: After the indicator check is completed, the system enters the DTC check mode automatically. Read the DTC on the panel. NOTE: In the sensor check mode, which is automatically transferred from the indicator check mode, troubleshooting may be partially performed. Be sure to perform the actuator check, and then the sensor check again. If the check is performed in a dark place, DTC 21 or 24 may be displayed even though the system is normal. HINT: Refer to the «DTC CHART»(ref-283108-S06721167082008041700000) (Diagnostic Trouble Code chart) for details of the codes . When there are no problems, DTC 00 is output. As an example, the illustration shows that DTC 21 is output. If the steps are difficult to read because they change automatically, push the "UPDr" switch to display the steps one at a time so that they can be read easily. The items are displayed step by step each time the "UPDr" switch is pushed. HINT: Push the "OFF" switch to finish panel diagnosis. Push the "R/F" switch to enter the actuator check mode.
4. ACTUATOR CHECK Start the engine and warm it up. Perform the indicator check. Push the "R/F" switch to perform the actuator check. HINT: Be sure to perform the actuator check after starting the engine. As the actuator check is repeated from steps 1 to 10 at 1-second intervals, check the temperature and air flow visually and by hand. HINT: The display blinks at 1-second intervals in the step operation. Push the "OFF" switch to finish panel diagnosis. Push the "AUTO" switch to enter the sensor check mode. AIR CONDITION REFERENCE CHART Step No. Display Code Conditions Blower Level Air Mix Damper Airflow Vent Air Inlet Damper Compressor 1 0 0 0% open FACE FRESH OFF 2 1 1 0% open FACE FRESH OFF 3 2 17 0% open FACE RECIRCULATION / FRESH ON 4 3 17 0% open FACE RECIRCULATION ON 5 4 17 50% open B/L RECIRCULATION ON 6 5 17 50% open B/L RECIRCULATION ON 7 6 17 50% open FOOT FRESH ON 8 7 17 100% open FOOT-0 FRESH ON 9 8 17 100% open F/D FRESH ON 10 9 31 100% open DEF FRESH ON If the steps are difficult to read because they change automatically, push the "UPDr" switch to display the steps one at a time so that they can be read easily. The items are displayed step by step each time the "UPDr" switch is pushed. HINT: Push the "OFF" switch to finish panel diagnosis. Push the "R/F" switch to enter the sensor check mode.

DATA LIST / ACTIVE TEST

1. DATA LIST HINT: Using the intelligent tester's DATA LIST allows switch, sensor, actuator, and other item values to be read without removing any parts. Reading the DATA LIST early in troubleshooting is one way to save time. Connect the intelligent tester to the DLC3. Turn the engine switch on (IG). Turn the tester on. Enter the following menus: DIAGNOSIS / OBD/ MOBD / AIR CONDITIONER / DATA LIST. Check the value (s) by referring to the table below. AIR CONDITIONER: DATA LIST - AIR CONDITIONER Tester Display Measurement Item/Range Normal Condition Diagnostic Note ROOM TEMP (Room temperature sensor) Room temperature sensor/ Min.: -6.5°C (20.3°F), Max.: 57.25°C (135.05°F) Actual cabin temperature is displayed - AMBI TEMP SENS (Ambient temperature sensor) Ambient temperature sensor / Min.: -23.3°C (-9.94°F), Max.: 65.95°C (150.71°F) Actual ambient temperature is displayed - AMBI TEMP (Adjusted ambient temperature) Adjusted ambient temperature / Min.: -30.8°C (-23.44°F), Max.: 50.8°C (123.44°F) - - EVAP FIN TEMP (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 - SOLAR SENS-D (Solar sensor (D side)) Driver side solar sensor / Min.: 0, Max.: 255 Driver side solar sensor value increases as brightness increases - SOLAR SENS-P (Solar sensor (P side)) Passenger side solar sensor / Min.: 0, Max.: 255 Passenger side solar sensor value increases as brightness increases - COOLANT TEMP (Engine coolant temperature) Engine coolant temperature / Min.: 1.3°C (34.34°F), Max.: 90.55°C (194.99°F) Actual engine coolant temperature is displayed while engine is warmed up - SET TEMP-D (Set temperature (D - side)) Driver side set temperature / Min.: 0°C (32°F), Max.: 31°C (54°F) Driver side set temperature is displayed - SET TEMP-P (Set temperature (P - side)) Passenger side set temperature / Min.: 0°C (32°F), Max.: 31°C (54°F) Passenger side set temperature is displayed - BLOWER LEVEL (Blower motor speed level) Blower motor speed level / Min.: 0 level, Max.: 31 level Increases in the range between 0 and 31 as the blower motor speed increases - NOX GAS SENS (Emission gas NOx sensor) Emission gas / Min.: 0, Max.: 255 Smog ventilation sensor value increases as gas amount increases - EMISS GAS SENS (Emission gas sensor) Emission gas / Min.: 0, Max.: 255 Smog ventilation sensor value increases as gas amount increases - REG PRESS SENS (Regulator pressure sensor) Regulator pressure sensor/Min.: -0.5 kgf/cm 2 G, Max.: 37.75 kgf/ cm 2 G Actual refrigerant pressure is displayed - REG CTRL CURRNT (Regulator control current) Compressor variable output current / Min.: 0 A, Max.: 0.996 A - - AIR MIX PULSE-D (Air mix servomotor target pulse (D side)) Driver side air mix servo motor target pulse / Min.: 0, Max.: 255 MAX. COLD: 5 (pulse) MAX. HOT: 103 (pulse) - AIR MIX PULSE-P (Air mix servomotor target pulse (P side)) Passenger side air mix servo motor target pulse / Min.: 0, Max.: 255 MAX. COLD: 105 (pulse) MAX. HOT: 7 (pulse) - AIR OUT PULSE-D (Air out pulse-D) Driver side air outlet servo motor target pulse / Min.: 0, Max.: 255 FACE: 8 (pulse) B/L: 30 to 38 (pulse) FOOT: 50 to 74 (pulse) FOOT/DEF: 80 (pulse) DEF: 97 (pulse) - A/I DAMP PLS (Air inlet damper target pulse) Air inlet damper target pulse / Min.: 0, Max.: 255 RECIRCULATION: 7 (pulse) FRESH: 28 (pulse) - #CODES (Number of trouble codes) Number of trouble codes / Min.: 0, Max.: 255 Number of DTCs will be displayed - ENGINE: DATA LIST - ENGINE Tester Display Measurement Item/Range Normal Condition Diagnostic Note A/C SIGNAL (A/C signal) A/C signal / ON or OFF ON: A/C ON OFF: A/C OFF
2. ACTIVE TEST HINT: Performing the intelligent tester's ACTIVE TEST allows relays, VSVs, actuators and other items to be operated without removing any parts. Performing the ACTIVE TEST early in troubleshooting is one way to save time. The DATA LIST can be displayed during the ACTIVE TEST. Connect the intelligent tester to the DLC3. Turn the engine switch on (IG). Turn the tester on. Enter the following menus: DIAGNOSIS / OBD/ MOBD / AIR CONDITIONER / ACTIVE TEST. Perform the ACTIVE TEST by referring to the table below. AIR CONDITIONER: ACTIVE TEST - AIR CONDITIONER Tester Display Test Part Control Range BLOWER MOTOR (Blower motor) Blower motor / Min.: Level 0, Max.: Level 31 - A/C MAG CLUTCH (Magnetic clutch relay) Magnetic clutch relay / OFF, ON - DEFOGER RLY-R (Defogger relay (Rear)) Defogger relay (Rear) / OFF, ON - AIR MIX PULSE-D (Air mix servomotor pulse (D side)) Driver side air mix servo motor pulse / Min.: 0, Max.: 255 - AIR MIX PULSE-P (Air mix servomotor pulse (P side)) Passenger side air mix servo motor pulse / Min.: 0, Max.: 255 - AIR OUT PULSE-D (Air outlet servomotor pulse (D side)) Driver side air outlet servo motor pulse / Min.: 0, Max.: 255 - A/I DAMP PLS (Air inlet damper target pulse) Air inlet damper target pulse / Min.: 0, Max.: 255

DIAGNOSTIC TROUBLE CODE CHART

AIR CONDITIONING SYSTEM

AIR CONDITIONING SYSTEM

INSPECTION PROCEDURE

HINT

1. If DTC B1244 is output at the same time, troubleshoot DTC B1244 first (See «DTC B1244 LIGHT SENSOR CIRCUIT MALFUNCTION»(ref-283105-S30552030612008041700000) ).
2. If the check is performed in a dark place, DTC B1421/21 or B1424/24 (solar sensor circuit abnormal) may be output even though the system is normal.

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1. READ VALUE OF INTELLIGENT TESTER Connect the intelligent tester to the DLC3. Turn the engine switch on (IG) and turn the intelligent tester main switch on. Expose the sensing portion of the solar sensor to light. HINT: Use an incandescent light for inspection. Select the item below in the DATA LIST, and read the display on the intelligent tester. DATA LIST / AIR CONDITIONER: DATA LIST Tester Display Measurement Item/Range Normal Condition Diagnostic Note SOLAR SENS-P (Solar sensor (P side)) Passenger side solar sensor / Min.: 0, Max.: 255 Passenger side solar sensor value increases as brightness increases - OK: The display is as specified in the normal condition column. Result RESULT CHART Result Proceed to NG A OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE) B OK (When troubleshooting according to the DTC) C B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-283108-S02001029892008041700000) C: REPLACE AIR CONDITIONING AMPLIFIER A: Go to Next Step
2. CHECK HARNESS AND CONNECTOR (SOLAR SENSOR) Disconnect the solar sensor connector. Measure the voltage according to the value (s) in the table below. Standard voltage SOLAR SENSOR Tester Connection Condition Specified Condition G3-6 (CLTB) - G3-3 (CLTE) Engine switch off Below 1 V G3-6 (CLTB) - G3-3 (CLTE) Engine switch on (IG) 10 to 14 V OK: Go to step 4 NG: Go to Next Step
3. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - SOLAR SENSOR) Disconnect the main body ECU connector. Measure the resistance according to the value (s) in the table below. Standard resistance MAIN BODY ECU - SOLAR SENSOR Tester Connection Condition Specified Condition E60-20 (CLTB) - G3-6 (CLTB) Always Below 1 ohms E60-18 (CLTE) - G3-3 (CLTE) Always Below 1 ohms E60-20 (CLTB) - Body ground Always 10 kohms or higher E60-18 (CLTE) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE MAIN BODY ECU
4. CHECK SOLAR SENSOR Remove the solar sensor with its connector still connected. Connect the positive (+) lead from the battery to terminal 6 (CLTB), and the negative (-) lead to terminal 3 (CLTE) of the solar sensor. Measure the voltage according to the value (s) in the table below. Standard voltage SOLAR SENSOR Tester Connection Condition Specified Condition G3-2 (TSR) - G3-3 (CLTE) Sensor is subjected to electric light 0.8 to 4.3 V G3-2 (TSR) - G3-3 (CLTE) Sensor is covered with a cloth Below 0.8 V NOTE: The connection procedure for using a digital tester such as a TOYOTA electrical tester is shown above. When using an analog tester, connect the negative (-) lead to terminal 6, and the positive (+) lead to terminal 3 of the solar sensor. While using the battery during inspection, do not bring the positive and negative tester probes too close to each other as a short circuit may occur. HINT: Use an incandescent light for inspection. Bring it within about 30 cm (11.8 in.) of the solar sensor. As the inspection light is moved away from the sensor, the voltage increases. NG: REPLACE SOLAR SENSOR OK: Go to Next Step
5. CHECK HARNESS AND CONNECTOR (SOLAR SENSOR - A/C AMPLIFIER) Disconnect the solar sensor connector. Disconnect the A/C amplifier connector. Measure the resistance according to the value (s) in the table below. Standard resistance SOLAR SENSOR - A/C AMPLIFIER Tester Connection (Symbols) Condition Specified Condition E1-32 (TSP) - G3-2 (TSR) Always Below 1 ohms E1-32 (TSP) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE AIR CONDITIONING AMPLIFIER

HINT

1. If DTC B1244 is output at the same time, troubleshoot DTC B1244 first (See «DTC B1244 LIGHT SENSOR CIRCUIT MALFUNCTION»(ref-283105-S30552030612008041700000) ).
2. If the check is performed in a dark place, DTC B1421/21 or B1424/24 (solar sensor circuit abnormal) may be output even though the system is normal.

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1. READ VALUE OF INTELLIGENT TESTER Connect the intelligent tester to the DLC3. Turn the engine switch on (IG) and turn the intelligent tester main switch on. Expose the sensing portion of the solar sensor to light. HINT: Use an incandescent light for inspection. Select the item below in the DATA LIST, and read the display on the intelligent tester. DATA LIST / AIR CONDITIONER: DATA LIST Tester Display Measurement Item/Range Normal Condition Diagnostic Note SOLAR SENS-D (Solar sensor (D side)) Driver side solar sensor/ Min.: 0, Max.: 255 Driver side solar sensor value increases as brightness increases - OK: The display is as specified in the normal condition column. Result RESULT CHART Result Proceed to NG A OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE) B OK (When troubleshooting according to the DTC) C B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-283108-S02001029892008041700000) C: REPLACE AIR CONDITIONING AMPLIFIER A: Go to Next Step
2. CHECK HARNESS AND CONNECTOR (SOLAR SENSOR) Disconnect the solar sensor connector. Measure the voltage according to the value (s) in the table below. Standard voltage SOLAR SENSOR VOLTAGE Tester Connection Condition Specified Condition G3-6 (CLTB) - G3-3 (CLTE) Engine switch on (IG) 10 to 14 V G3-6 (CLTB) - G3-3 (CLTE) Engine switch off Below 1 V OK: Go to step 4 NG: Go to Next Step
3. CHECK HARNESS AND CONNECTOR (SOLAR SENSOR - MAIN BODY ECU) Disconnect the main body ECU connector. Measure the resistance according to the value (s) in the table below. Standard resistance SOLAR SENSOR - MAIN BODY ECU Tester Connection Condition Specified Condition E60-20 (CLTB) - G3-6 (CLTB) Always Below 1 ohms E60-18 (CLTE) - G3-3 (CLTE) Always Below 1 ohms E60-20 (CLTB) - Body ground Always 10 kohms or higher E60-18 (CLTE) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE MAIN BODY ECU
4. CHECK SOLAR SENSOR Remove the solar sensor with its connector still connected. Connect the positive (+) lead from the battery to terminal 6 (CLTB), and the negative (-) lead to terminal 3 (CLTE) of the solar sensor. Measure the voltage according to the value (s) in the table below. Standard voltage SOLAR SENSOR VOLTAGE Tester Connection Condition Specified Condition G3-1 (TSL) - G3-3 (CLTE) Sensor is subjected to electric light 0.8 to 4.3 V G3-1 (TSL) - G3-3 (CLTE) Sensor Is covered with a cloth Below 0.8 V NOTE: The connection procedure for using a digital tester such as a TOYOTA electrical tester is shown above. When using an analog tester, connect the negative (-) lead to terminal 6, and the positive (+) lead to terminal 3 of the solar sensor. While using the battery during inspection, do not bring the positive and negative tester probes too close to each other as a short circuit may occur. HINT: Use an incandescent light for inspection. Bring it within about 30 cm (11.8 in.) of the solar sensor. As the inspection light is moved away from the sensor, the voltage increases. NG: REPLACE SOLAR SENSOR OK: Go to Next Step
5. CHECK HARNESS AND CONNECTOR (SOLAR SENSOR - A/C AMPLIFIER) Disconnect the solar sensor connector. Disconnect the A/C amplifier connector. Measure the resistance according to the value (s) in the table below. Standard resistance SOLAR SENSOR - A/C AMPLIFIER Tester Connection Condition Specified Condition E1-33 (TSD) - G3-1 (TSL) Always Below 1 ohms E1-33 (TSD) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE AIR CONDITIONING AMPLIFIER

1. READ VALUE OF INTELLIGENT TESTER Connect the intelligent tester to the DLC3. Turn the engine switch on (IG) and turn the intelligent tester main switch on. Operate the front passenger side temperature adjustment switch. Select the item below in the DATA LIST, and read the display on the intelligent tester. DATA LIST / AIR CONDITIONER: DATA LIST Tester Display Measurement Item/Range Normal Condition Diagnostic Note AIR MIX PULSE-P (Air mix servomotor target pulse (P side)) Passenger side air mix servo motor target pulse / Min.: 0, Max.: 255 MAX. COLD: 105 (pulse) MAX. HOT: 7 (pulse) - OK: The display is as specified in the normal condition column. Result RESULT CHART Result Proceed to NG A OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE) B OK (When troubleshooting according to the DTC) C B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-283108-S02001029892008041700000) C: REPLACE AIR CONDITIONING AMPLIFIER A: Go to Next Step
2. REPLACE AIR MIX CONTROL SERVO MOTOR Replace the air mix control servo motor. HINT: Since the servo motor cannot be inspected while it is removed from the vehicle, replace the servo motor with a normal one and check that the condition returns to normal. Check for DTCs. Result AIR MIX CONTROL SERVO MOTOR Result Proceed to DTC B1441/41 is output A DTC B1441/41 is not output B B: END A: REPLACE AIR CONDITIONING HARNESS

1. READ VALUE OF INTELLIGENT TESTER Connect the intelligent tester to the DLC3. Turn the engine switch on (IG) and turn the intelligent tester main switch on. Operate the R/F (Recirculation/Fresh) switch. Select the item below in the DATA LIST, and read the display on the intelligent tester. DATA LIST / AIR CONDITIONER: DATA LIST Tester Display Measurement Item/Range Normal Condition Diagnostic Note A/I DAMP PLS (Air inlet damper target pulse) Air inlet damper target pulse / Min.: 0, Max.: 255 RECIRCULATION: 7 (pulse) FRESH: 28 (pulse) - OK: The display is as specified in the normal condition column. Result RESULT CHART Result Proceed to NG A OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE) B OK (When troubleshooting according to the DTC) C B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-283108-S02001029892008041700000) C: REPLACE AIR CONDITIONING AMPLIFIER A: Go to Next Step
2. REPLACE AIR INLET CONTROL SERVO MOTOR Replace the air inlet control servo motor. HINT: Since the servo motor cannot be inspected while it is removed from the vehicle, replace the servo motor with a normal one and check that the condition returns to normal. Check for DTCs. Result AIR INLET CONTROL SERVO MOTOR Result Proceed to DTC B1442/42 is output A DTC B1442/42 is not output B B: END A: REPLACE AIR CONDITIONING HARNESS

1. READ VALUE OF INTELLIGENT TESTER Connect the intelligent tester to the DLC3. Turn the engine switch on (IG) and turn the intelligent tester main switch on. Operate the MODE switch. Select the item below in the DATA LIST, and read the display on the intelligent tester. DATA LIST / AIR CONDITIONER: DATA LIST Tester Display Measurement Item/Range Normal Condition Diagnostic Note AIR OUT PULSE-D (Air outlet servomotor target pulse (D side)) Driver side air outlet servo motor target pulse / Min.: 0, Max.: 255 FACE: 8 (pulse) B/L: 30 to 38 (pulse) FOOT: 50 to 74 (pulse) FOOT/DEF: 80 (pulse) DEF: 97 (pulse) - OK: The display is as specified in the normal condition column. Result RESULT CHART Result Proceed to NG A OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE) B OK (When troubleshooting according to the DTC) C B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-283108-S02001029892008041700000) C: REPLACE AIR CONDITIONING AMPLIFIER A: Go to Next Step
2. REPLACE AIR OUTLET CONTROL SERVO MOTOR Replace the air outlet control servo motor. HINT: Since the servo motor cannot be inspected while it is removed from the vehicle, replace the servo motor with a normal one and check that the condition returns to normal. Check for DTCs. Result AIR OUTLET CONTROL SERVO MOTOR Result Proceed to DTC B1443/43 is output A DTC B1443/43 is not output B B: END A: REPLACE AIR CONDITIONING HARNESS

1. READ VALUE OF INTELLIGENT TESTER Connect the intelligent tester to the DLC3. Turn the engine switch on (IG) and turn the intelligent tester main switch on. Operate the driver side temperature adjustment switch. Select the item below in the DATA LIST, and read the display on the intelligent tester. DATA LIST / AIR CONDITIONER: DATA LIST Tester Display Measurement Item/Range Normal Condition Diagnostic Note AIR MIX PULSE-D (Air mix servomotor target pulse (D side)) Driver side air mix servo motor target pulse / Min.: 0, Max.: 255 MAX COLD: 5 (pulse) MAX HOT: 103 (pulse) - OK: The display is as specified in the normal condition column. Result RESULT CHART Result Proceed to NG A OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE) B OK (When troubleshooting according to the DTC) C B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-283108-S02001029892008041700000) C: REPLACE AIR CONDITIONING AMPLIFIER A: Go to Next Step
2. REPLACE AIR MIX CONTROL SERVO MOTOR Replace the air mix control servo motor. HINT: Since the servo motor cannot be inspected while it is removed from the vehicle, replace the servo motor with a normal one and check that the condition returns to normal. Check for DTCs. Result AIR MIX CONTROL SERVO MOTOR Result Proceed to DTC B1446/46 is output A DTC B1446/46 is not output B B: END A: REPLACE AIR CONDITIONING HARNESS

HINT

Refer to the CAN communication system (See HOW TO PROCEED WITH TROUBLESHOOTING ).

Scheme 161

The blower motor is operated by signals from the A/C amplifier. The blower motor speed is controlled using various duty ratios.

Duty Ratio

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

The blower motor controller controls the blower motor speed.

Scheme 162

Scheme 163

Scheme 164

Scheme 165

Scheme 166

Scheme 167

Scheme 168

Scheme 169

Scheme 170

Scheme 171

1. PERFORM ACTIVE TEST BY INTELLIGENT TESTER Connect the intelligent tester to the DLC3. Turn the engine switch on (IG) and turn the intelligent tester main switch on. Select the item below in the ACTIVE TEST and then check that the blower motor operates. ACTIVE TEST / AIR CONDITIONER: ACTIVE TEST Tester Display Test Part Control Range BLOWER MOTOR (Blower motor) Blower motor/ Min.: Level 01, Max.: Level 31 - Result RESULT CHART Result Proceed to OK A NG (blower motor does not operate) B NG (blower motor operates but does not change speed) C B: Go to step 2 C: Go to step 6 A: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-283108-S02001029892008041700000)
2. INSPECT FUSIBLE LINK (HTR) Remove the fusible link from the engine room R/B No. 1. Check if the fusible link is melted. OK: The point indicated by "A" is not melted. Measure the resistance according to the value (s) in the table below. Standard resistance FUSIBLE LINK (HTR) Tester Item Condition Specified Condition HTR fuse (B-C) Always Below 1 ohms Install the fusible link to the engine room R/B with the nut. NG: REPLACE FUSIBLE LINK (HTR) OK: Go to Next Step
3. CHECK HARNESS AND CONNECTOR (BLOWER MOTOR - BODY GROUND) Disconnect the blower motor connector. Measure the resistance according to the value (s) in the table below. Standard resistance BLOWER MOTOR - BODY GROUND Tester Connection Condition Specified Condition E12-1 (GND) - Body ground Always Below 1 ohms NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to Next Step
4. CHECK HARNESS AND CONNECTOR (BLOWER MOTOR - BATTERY) Disconnect the blower motor connector. Measure the voltage according to the value (s) in the table below. Standard voltage BLOWER MOTOR - BATTERY Tester Connection Condition Specified Condition E12-3 (+B) - Body ground Always 10 to 14 V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to Next Step
5. CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - BLOWER MOTOR) Disconnect the A/C amplifier connector. Measure the resistance according to the value (s) in the table below. Standard resistance A/C AMPLIFIER - BLOWER MOTOR RESISTANCE Tester Connection (Symbols) Condition Specified Condition E12-2 (SI) - E1-23 (BLW) Always Below 1 ohms E12-2 (SI) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to Next Step
6. INSPECT BLOWER MOTOR Reconnect the connector to the blower motor. Measure the voltage on the A/C amplifier connector side according to the value (s) in the table below. Standard voltage BLOWER MOTOR VOLTAGE Tester Connection Condition Specified Condition E1-23 (BLW) - Body ground Engine switch on (IG) 4.5 to 5.5 V NG: REPLACE BLOWER MOTOR OK: Go to Next Step
7. INSPECT AIR CONDITIONING AMPLIFIER Remove the A/C amplifier. Reconnect the connector to the A/C amplifier. Turn the engine switch on (IG). Turn the blower switch ON. Measure the waveform between terminal E1 -23 (BLW) of the A/C amplifier and body ground. OK: Waveform is see scheme 115 HINT: Waveform varies with the blower level. AIR CONDITIONING AMPLIFIER Item Contents Tool setting 1 V/DIV., 500 μs/DIV. Vehicle condition Engine switch on (IG) Blower switch ON NG: REPLACE AIR CONDITIONING AMPLIFIER OK: REPLACE BLOWER MOTOR

HINT

Start the engine before inspection. Check the IG1 relay or battery if the engine does not start.

Scheme 172

Scheme 173

Scheme 174

1. INSPECT FUSE (A/C NO. 2) Remove the A/C No. 2 fuse from the instrument panel J/ B. Measure the resistance according to the value (s) in the table below. Standard resistance FUSE (A/C NO. 2) Tester Item Condition Specified Condition A/C No. 2 fuse Always Below 1 ohms NG: REPLACE FUSE (A/C NO. 2) OK: Go to Next Step
2. INSPECT AIR CONDITIONING AMPLIFIER (IG+ - GND) Remove the A/C amplifier with its connectors still connected. Turn the engine switch on (IG). Measure the voltage according to the value (s) in the table below. Standard voltage AIR CONDITIONING AMPLIFIER (IG+ - GND) VOLTAGE Tester Connection Condition Specified Condition E1-1 (IG+) - E1-14 (GND) Engine switch on (IG) 10 to 14 V NG: Go to step 3 OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-283108-S02001029892008041700000)
3. CHECK WIRE HARNESS (AIR CONDITIONING AMPLIFIER - BATTERY) Disconnect the A/C amplifier connector. Measure the voltage according to the value (s) in the table below. Standard voltage AIR CONDITIONING AMPLIFIER - BATTERY VOLTAGE Tester Connection Condition Specified Condition E1-1 (IG+) - Body ground Engine switch off Below 1 V Engine switch on (IG) 10 to 14 V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to Next Step
4. CHECK WIRE HARNESS (AIR CONDITIONING AMPLIFIER - BODY GROUND) Disconnect the A/C amplifier connector. Measure the resistance according to the value (s) in the table below. Standard resistance AIR CONDITIONING AMPLIFIER - BODY GROUND RESISTANCE Tester Connection Condition Specified Condition E1-14 (GND) - Body ground Always Below 1 ohms NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE AIR CONDITIONING AMPLIFIER