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Diagnostic Trouble Code Chart

WARNING: This page is about a different car, the 2008 Lexus RX 350. However, it is still accessible from the selected car via links, so may be relevant.

If a trouble code is displayed during the DTC check (sensor check), check the circuit listed for the code in the table below .

AIR CONDITIONING SYSTEM: 

AIR CONDITIONER SPECIFICATION

DTC No. Detection Item Trouble Area Memory *4 See
B1411/11  *1 Room Temperature Sensor Circuit
  1. A/C room temperature sensor
  2. Harness or connector between A/C room temperature sensor and A/C amplifier
  3. A/C amplifier
 Memorized (8.5 min. or more)  
B1412/12  *2 Ambient Temperature Sensor Circuit
  1. A/C ambient temperature sensor
  2. Harness or connector between A/C ambient temperature sensor and A/C amplifier
  3. A/C amplifier
 Memorized (8.5 min. or more)  
B1413/13  Evaporator Temperature Sensor Circuit
  1. A/C evaporator temperature sensor
  2. Harness or connector between A/C evaporator temperature sensor and A/C amplifier
  3. A/C amplifier
 Memorized (8.5 min. or more)  
B1421/21  *3 Solar Sensor Circuit (Passenger Side)
  1. Automatic light control sensor (A/C solar sensor)
  2. Harness or connector between automatic light control sensor (A/C solar sensor) and A/C amplifier
  3. Harness or connector between automatic light control sensor (A/C solar sensor) and body ECU
  4. A/C amplifier
  5. Body ECU
 Memorized (8.5 min. or more) (only when circuit is shorted)  
B1422/22  *5 Compressor Lock Sensor Circuit
  1. Compressor and magnetic clutch (A/C lock sensor)
  2. Compressor drive belt
  3. Harness or connector between A/C amplifier and compressor and magnetic clutch (A/C lock sensor)
  4. Multiplex communication circuit
  5. CAN communication circuit
  6. A/C amplifier
 -  
B1423/23  Pressure Switch Circuit
  1. A/C pressure sensor
  2. Harness or connector between A/C amplifier and A/C pressure sensor
  3. Refrigerant pipe line
  4. A/C amplifier
 -  
B1424/24  *3 Solar Sensor Circuit (Driver Side)
  1. Automatic light control sensor (A/C solar sensor)
  2. Harness or connector between automatic light control sensor (A/C solar sensor) and A/C Amplifier
  3. Harness or connector between automatic light control sensor (A/C solar sensor) and body ECU
  4. A/C amplifier
  5. Body ECU
 Memorized (8.5 min. or more) (only when circuit is shorted)  
B1431/31  Air Mix Damper Position Sensor Circuit (Passenger Side)
  1. Air mix control servo motor
  2. Harness or connector between A/C amplifier and air mix control servo motor
  3. A/C amplifier
 Memorized (1 min. or more)  
B1432/32  Air Inlet Damper Position Sensor Circuit
  1. Air inlet control servo motor
  2. Harness or connector between air inlet control servo motor and A/C amplifier
  3. A/C amplifier
 Memorized (1 min. or more)  
B1433/33  Air Outlet Damper Position Sensor Circuit
  1. Air outlet control servo motor
  2. Harness or connector between air outlet control servo motor and A/C amplifier
  3. A/C amplifier
 Memorized (1 min. or more)  
B1436/36  Air Mix Damper Position Sensor Circuit (Driver Side)
  1. Air mix control servo motor
  2. Harness or connector between air mix control servo motor and A/C amplifier
  3. A/C amplifier
 Memorized (1 min. or more)  
B1441/41  Air Mix Damper Control Servo Motor Circuit (Passenger Side)
  1. Air mix control servo motor
  2. Harness or connector between air mix control servo motor and A/C amplifier
  3. A/C amplifier
 Memorized (15 sec.)  
B1442/42  Air Inlet Damper Control Servo Motor Circuit
  1. Air inlet control servo motor
  2. Harness or connector between air inlet control servo motor and A/C amplifier
  3. A/C amplifier
 Memorized (15 sec.)  
B1443/43  Air Outlet Damper Control Servo Motor Circuit
  1. Air outlet control servo motor
  2. Harness or connector between air outlet control servo motor and A/C amplifier
  3. A/C amplifier
 Memorized (15 sec.)  
B1446/46  Air Mix Damper Control Servo Motor Circuit (Driver Side)
  1. Air mix control servo motor
  2. Harness or connector between air mix control servo motor and A/C amplifier

  1. 4. A/C amplifier
 Memorized (15 sec.)  
B1451/51  Compressor Solenoid Circuit
  1. Compressor and magnetic clutch (A/C compressor solenoid)
  2. Harness or connector between A/C amplifier and compressor and magnetic clutch (A/C compressor solenoid)
  3. A/C amplifier
 Memorized (1 min. or more)  
B1499/99  Multiplex Communication Circuit Multiplex communication system -  
HINT:
  • *1 : If the cabin temperature is approx. -18.6°C (-1.48°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 (-63.22°F) or lower, DTC B1412/12 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) may be output.
  • *4 : The A/C amplifier memorizes the DTC of the respective malfunction if it has occurred for a period of time indicated in the brackets.
  • *5 : Compressor lock (DTC B1422/22) is indicated only for the current malfunction. To confirm DTC B1422/22, preform the following steps.
  1. With the engine running, enter the DTC check mode.
  2. Press the R/F switch to enter the actuator check mode, and set the operation to Step No. 3.
  3. Press the AUTO switch to return to the DTC check mode.
  4. The DTC is displayed after approx. 3 seconds.
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