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Home >> Lexus >> 2021 >> GX 460 Base >> Repair and Diagnosis (Single Page) >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Air Conditioning System (Diagnostics - Introduction) >> Air Conditioning System >> Diagnostic Trouble Code Chart [08/2015 - 08/2019] >> Diagnostic Trouble Code Chart [08/2015 - 08/2019]

Diagnostic Trouble Code Chart [08/2015 - 08/2019]

HINT: 

If a trouble code is output during the DTC check, inspect the trouble areas listed for that code. For details of the code, refer to the appropriate service information below.

  1. *1: The air conditioning amplifier stores the DTC of the respective malfunction that has been detected for the period of time indicated in parentheses.
  2. *2: w/ Rear Air Conditioning System
DTC Code Detection Item Trouble Area Memory*1 Diagnostic Note Refer To
B1411/11 Room Temperature Sensor Circuit - Cooler thermistor (room temperature sensor)
- Harness or connector
- Air conditioning amplifier assembly
Stored
(4 seconds or more)
If the front room temperature is approx. -18.6°C (-1.48°F) or less, DTC B1411/11 may be stored even though the system is normal. Refer to DTC B1411/11: Room Temperature Sensor Circuit [08/2015 - ]
B1412/12 Ambient Temperature Sensor Circuit - Cooler thermistor (ambient temperature sensor)
- Harness or connector
- Air conditioning amplifier assembly
Stored
(4 seconds or more)
If the ambient temperature is approx. -52.9°C (-63.22°F) or less, DTC B1412/12 may be stored even though the system is normal. Refer to DTC B1412/12: Ambient Temperature Sensor Circuit [08/2015 - 08/2019]
B1413/13 Evaporator Temperature Sensor Circuit - No. 1 cooler thermistor
- Air conditioning harness assembly
- Air conditioning amplifier assembly
Stored
(4 seconds or more)
- Refer to DTC B1413/13: Evaporator Temperature Sensor Circuit [08/2015 - ]
B1417/17*2 Rear Evaporator Temperature Sensor Circuit - No. 2 air conditioning harness assembly (rear evaporator temperature sensor)
- Harness or connector
- Air conditioning amplifier assembly
Stored
(4 seconds or more)
- Refer to DTC B1417/17: Rear Evaporator Temperature Sensor Circuit [08/2015 - ]
B1418/18*2 Exhaust Gas Sensor Circuit - Smog ventilation sensor
- Harness or connector
- Air conditioning amplifier assembly
- - Refer to DTC B1418/18: Exhaust Gas Sensor Circuit [08/2015 - 08/2019]
B1419/19*2 Rear Room Temperature Sensor Circuit - Cooler thermistor (rear room temperature sensor)
- Harness or connector
- Air conditioning amplifier assembly
Stored
(4 seconds or more)
- Refer to DTC B1419/19: Rear Room Temperature Sensor Circuit [08/2015 - ]
B1422/22 Compressor Lock Sensor Circuit - Cooler compressor assembly (A/C lock sensor)
- Compressor drive belt
- Harness or connector
- Air conditioning amplifier assembly
- CAN communication system
- - Refer to DTC B1422/22: Compressor Lock Sensor Circuit [08/2015 - ]
B1423/23*2 Pressure Sensor Circuit - Air conditioner pressure sensor
- Harness or connector
- Cooler expansion valve
- Cooler condenser assembly
- Cooler dryer
- Air conditioning system (leaks, blocked)
- Refrigerant pipe line
- Air conditioning amplifier assembly
Stored
(4 seconds or more)
- Refer to DTC B1423/23: Pressure Sensor Circuit [08/2015 - ]
B1441/41 Air Mix Damper Control Servo Motor Circuit (Passenger Side) - No. 2 air conditioning radiator damper servo sub-assembly (front passenger side air mix damper servo)
- Air conditioning harness assembly
- Air conditioning amplifier assembly
Stored
(30 seconds or more)
- Refer to DTC B1441/41: Air Mix Damper Control Servo Motor Circuit (Passenger Side) [08/2015 - ]
B1442/42 Air Inlet Damper Control Servo Motor Circuit - Recirculation damper servo sub-assembly
- Air conditioning harness assembly
- Air conditioning amplifier assembly
Stored
(30 seconds or more)
- Refer to DTC B1442/42: Air Inlet Damper Control Servo Motor Circuit [08/2015 - ]
B1443/43 Air Outlet Damper Control Servo Motor Circuit - No. 1 air conditioning radiator damper servo sub-assembly (mode damper servo)
- Air conditioning harness assembly
- Air conditioning amplifier assembly
Stored
(30 seconds or more)
- Refer to DTC B1443/43: Air Outlet Damper Control Servo Motor Circuit [08/2015 - ]
B1446/46 Air Mix Damper Control Servo Motor Circuit (Driver Side) - No. 1 air conditioning radiator damper servo sub-assembly (driver side air mix damper servo)
- Air conditioning harness assembly
- Air conditioning amplifier assembly
Stored
(30 seconds or more)
- Refer to DTC B1446/46: Air Mix Damper Control Servo Motor Circuit (Driver Side) [08/2015 - ]
B1447/47*2 Rear Air Mix Damper Control Servo Motor Circuit - Rear No. 1 cooling unit damper servo sub-assembly (rear air mix damper servo)
- No. 2 air conditioning harness assembly
- Harness or connector
- Air conditioning amplifier assembly
Stored
(30 seconds or more)
- Refer to DTC B1447/47: Rear Air Mix Damper Control Servo Motor Circuit [08/2015 - ]
B1449/49*2 Rear Air Outlet Damper Control Servo Motor Circuit - Rear No. 2 cooling unit damper servo sub-assembly (rear mode damper servo)
- No. 2 air conditioning harness assembly
- Harness or connector
- Air conditioning amplifier assembly
Stored
(30 seconds or more)
- Refer to DTC B1449/49: Rear Air Outlet Damper Control Servo Motor Circuit [08/2015 - ]
B1461/61*2 Emission Gas NOx Sensor Circuit - Smog ventilation sensor
- Harness or connector
- Air conditioning amplifier assembly
- - Refer to DTC B1461/61: Emission Gas NOx Sensor Circuit [08/2015 - 08/2019]
B1497/97 BUS IC Communication Malfunction - Air conditioning harness assembly
- No. 2 air conditioning harness assembly*2
- No. 1 air conditioning radiator damper servo sub-assembly (driver side air mix damper servo)
- No. 2 air conditioning radiator damper servo sub-assembly (front passenger side air mix damper servo)
- No. 1 air conditioning radiator damper servo sub-assembly (mode damper servo)
- Recirculation damper servo sub-assembly
- Rear No. 1 cooling unit damper servo sub-assembly (rear air mix damper servo)*2
- Rear No. 2 cooling unit damper servo sub-assembly (rear mode damper servo)*2
- Air conditioning amplifier assembly
- Harness or connector
Stored
(10 seconds or more)
- Refer to DTC B1497/97: BUS IC Communication Malfunction [08/2015 - ]
B14A2 Driver Side Solar Sensor Short Circuit - Automatic light control sensor (solar sensor)
- Harness or connector
- Main body ECU (multiplex network body ECU)
- Air conditioning amplifier assembly
Stored
(4 seconds or more)
If the check is performed in a dark place, DTC B14A3 (front passenger side solar sensor short circuit) may also be stored. Refer to DTC B14A2: Driver Side Solar Sensor Short Circuit [08/2015 - 08/2019]
B14A3 Front Passenger Side Solar Sensor Short Circuit - Automatic light control sensor (solar sensor)
- Harness or connector
- Main body ECU (multiplex network body ECU)
- Air conditioning amplifier assembly
Stored
(4 seconds or more)
If the check is performed in a dark place, DTC B14A2 (driver side solar sensor short circuit) may also be stored. Refer to DTC B14A3: Front Passenger Side Solar Sensor Short Circuit [08/2015 - 08/2019]
U0100 Lost Communication with ECM - CAN communication system
- ECM
- - Refer to DTC U0100: Lost Communication with ECM; DTC U0142: Lost Communication with Main Body ECU; DTC U0155: Lost Communication with Combination Meter [08/2015 - ]
U0142 Lost Communication with Main Body ECU - CAN communication system
- Main body ECU (multiplex network body ECU)
- - Refer to DTC U0100: Lost Communication with ECM; DTC U0142: Lost Communication with Main Body ECU; DTC U0155: Lost Communication with Combination Meter [08/2015 - ]
U0155 Lost Communication with Combination Meter - CAN communication system
- Combination meter assembly
- - Refer to DTC U0100: Lost Communication with ECM; DTC U0142: Lost Communication with Main Body ECU; DTC U0155: Lost Communication with Combination Meter [08/2015 - ]