Home ReviewsRefund
Home/Lexus/RX/Lexus RX II facelift (2006-2009)/Repair manual/Air Conditioning: Diagnosis/DIAGNOSTIC TROUBLE CODE CHART
Contents Wiring diagrams Section: Air Conditioning: Diagnosis All sections

DIAGNOSTIC TROUBLE CODE CHART Lexus RX II facelift

Air Conditioning: Diagnosis

DIAGNOSTIC TROUBLE CODE CHART

If a malfunction code is displayed during the DTCs check (sensor check), check the circuit listed for the code in the table below (proceed to the link given for that circuit).

AIR CONDITIONING SYSTEM

DTC No.Detection ItemTrouble AreaMemory* 4Proceed to
B1411/11* 1Room Temperature Sensor CircuitCooler thermistor No. 1 Harness or connector between cooler thermistor No. 1 and A/C amplifier A/C amplifierMemorized (8.5 min. or more)B1411/11
B1412/12* 2Ambient Temperature Sensor CircuitCooler thermistor (ambient temperature sensor) Harness or connector between cooler thermistor (ambient temperature sensor) and ECM ECM Multiplex communication circuit A/C amplifierMemorized (8.5 min. or more)B1412/12
B1413/13Evaporator Temperature Sensor CircuitCooler thermistor No. 1 Harness or connector between cooler thermistor No. 1 and A/C amplifier A/C amplifierMemorized (8.5 min. or more)B1413/13
B1421/21* 3Solar Sensor Circuit (Passenger Side)Automatic light control sensor Harness or connector between automatic light control sensor and A/C amplifier or body ECU A/C amplifierMemorized* 6 (8.5 min. or more) -* 7B1421/21
B1422/22* 5Compressor Lock Sensor CircuitCooler compressor assembly Cooler compressor assembly drive belt Cooler compressor and magnetic clutch lock sensor Harness and connector between ECM and cooler compressor assembly, cooler compressor assembly and body ground Multiplex communication circuit ECM A/C amplifierB1422/22
B1423/23Pressure Switch CircuitPressure switch Harness or connector between pressure switch and ECM, Pressure switch and body ground Multiplex communication circuit Refrigerant pipe line ECM A/C amplifierB1423/23
B1424/24* 3Solar Sensor Circuit (Driver Side)Automatic light control sensor Harness or connector between automatic light control sensor and A/C Amplifier or body ECU A/C amplifierMemorized* 6 -* 7B1424/24
B1431/31Air Mix Damper Position Sensor Circuit (Passenger Side)Damper position sensor Harness or connector between damper servo sub-assembly and A/C amplifier A/C amplifierMemorized (1 min. or more)B1431/31
B1432/32Air Inlet Damper Position Sensor CircuitDamper position sensor Harness or connector between damper servo sub-assembly and A/C amplifier A/C amplifierMemorized (1 min. or more)B1432/32
B1433/33Air Outlet Damper Position Sensor CircuitDamper position sensor Harness or connector between damper servo sub-assembly and A/C amplifier A/C amplifierMemorized (1 min. or more)B1433/33
B1436/36Air Mix Damper Position Sensor Circuit (Driver Side)Damper position sensor Harness or connector between damper servo sub-assembly and A/C amplifier A/C amplifierMemorized (1 min. or more)B1436/36
B1441/41Air Mix Damper Control Servomotor Circuit (Passenger Side)Damper servo sub-assembly Damper position sensor Harness or connector between damper servo sub-assembly and A/C amplifier A/C amplifierMemorized (15 sec.)B1441/41
B1442/42Air Inlet Damper Control Servo Motor CircuitDamper servo sub-assembly Damper position sensor Harness or connector between damper servo sub-assembly and A/C amplifier A/C amplifierMemorized (15 sec.)B1442/42
B1443/43Air Outlet Damper Control Servo Motor CircuitDamper servo sub-assembly Damper position sensor Harness or connector between damper servo sub-assembly and A/C amplifier A/C amplifierMemorized (15 sec.)B1443/43
B1446/46Air Mix Damper Control Servomotor Circuit (Driver Side)Damper servo sub-assembly Damper position sensor Harness or connector between damper servo sub-assembly and A/C amplifier A/C amplifierMemorized (15 sec.)B1446/46
B1499/99Multiplex Communication CircuitOpen in multiplex communication circuitB1499/99
HINT: *1: If the room temperature is approx. -18.6°C (-3.7°F) or lower, DTC B1411/11 may be output even though the system is normal. *2: If the ambient temperature is approx. -52.9°C (-61.4°F) or lower, a malfunction code may be output even though the system is normal. *3: If the check is performed in a dark place, DTC B1421/21 or B1424/24 (solar sensor circuit abnormal) could be displayed. *4: The A/C amplifier memorizes the DTC of the respective malfunction that has occurred for a period of the time indicated in the brackets. *5: Compressor lock (DTC B1422/22) is indicated only for a current malfunction. To confirm DTC B1422/22, preform the following steps. With the engine on, enter the DTC check mode. Press the R/F switch to enter actuator check mode, and set the operation to Step No. 3. Press the AUTO switch to return to DTC check mode. The DTC is displayed after approx. 3 seconds. *6: Short in circuit *7: Open in circuit

DIAGNOSTIC TROUBLE CODE CHART