AIR CONDITIONING SYSTEM DIAGNOSTIC TROUBLE CODE CHART

AIR CONDITIONING SYSTEM
DTC No. Detection Item DTC Detection Condition Link
B1411 Room Temperature Sensor Circuit

  • Diagnosis condition: Ambient temperature is -30°C (-22°F) or more

  • Malfunction status: Open or short in room temperature sensor circuit

  • Detection time: None (Present malfunction), continuously for 4 seconds or more (Past malfunction)

Click here

B1412 Ambient Temperature Sensor Circuit

  • Diagnosis condition: None

  • Malfunction status: Open or short in ambient temperature sensor circuit

  • Detection time: None (Present malfunction), continuously for 4 seconds or more (Past malfunction)

Click here

B1413 Evaporator Temperature Sensor Circuit

  • Diagnosis condition: None

  • Malfunction status: Open or short in evaporator temperature sensor circuit

  • Detection time: None (Present malfunction), continuously for 4 seconds or more (Past malfunction)

Click here

B1418 Emission Gas Sensor Circuit

  • Diagnosis condition: None

  • Malfunction status: Short in smog ventilation sensor circuit (HC, CO)

  • Detection time: Continuously for 4 seconds or more (Present malfunction), although only when the power switch off → on (IG) continuously 28 seconds or more

Click here

B1423 Pressure Sensor Circuit

  • Diagnosis condition: Power switch on (IG)

  • Malfunction Status: Refrigerant pressure signal malfunction

  • Detection time: Continuously for 4 seconds or more (Present malfunction)

Click here

B1441 Air Mix Damper Control Servo Motor Circuit (Passenger Side)

  • Diagnosis condition: During No. 2 air conditioning radiator damper servo sub-assembly (front passenger side upper air mix) operation

  • Malfunction status: The damper servo operation request signal is output but the position information of the servo does not change or servo is malfunctioning

  • Detection time: Continuously for 30 seconds or more

Click here

B1442 Air Inlet Damper Control Servo Motor Circuit

  • Diagnosis condition: During No. 1 blower damper servo sub-assembly operation

  • Malfunction status: The damper servo operation request signal is output but the position information of the servo does not change or servo is malfunctioning

  • Detection time: Continuously for 30 seconds or more

Click here

B1443 Air Outlet Damper Control Servo Motor Circuit

  • Diagnosis condition: During No. 3 air conditioning radiator damper servo sub-assembly (MODE FACE) (for LHD) or No. 1 air conditioning radiator damper servo sub-assembly (MODE FACE) (for RHD) operation

  • Malfunction status: The damper servo operation request signal is output but the position information of the servo does not change or ervo is malfunctioning

  • Detection time: Continuously for 30 seconds or more

Click here

B1446 Air Mix Damper Control Servo Motor Circuit (Driver Side)

  • Diagnosis condition: No. 1 air conditioning radiator damper servo sub-assembly (driver side upper air mix) (for LHD) or No. 4 air conditioning radiator damper servo sub-assembly (driver side upper air mix) (for RHD) operation

  • Malfunction status: The damper servo operation request signal is output but the position information of the servo does not change or servo is malfunctioning

  • Detection time: Continuously for 30 seconds or more

Click here

B144A Air Outlet DEF Damper Control Servo Motor Circuit

  • Diagnosis condition: No. 4 air conditioning radiator damper servo sub-assembly (MODE DEF) (for LHD) or No. 3 air conditioning radiator damper servo sub-assembly (MODE DEF) (for RHD) operation

  • Malfunction status: The damper servo operation request signal is output but the position information of the servo does not change or servo is malfunctioning

  • Detection time: Continuously for 30 seconds or more

Click here

B1453 Air Outlet Damper Cool Control Servo Motor Circuit (Driver Side)

  • Diagnosis condition: No. 1 air conditioning radiator damper servo sub-assembly (driver side lower air mix) (for LHD) or No. 4 air conditioning radiator damper servo sub-assembly (driver side lower air mix) (for RHD) operation

  • Malfunction status: The damper servo operation request signal is output but the position information of the servo does not change or servo is malfunctioning

  • Detection time: Continuously for 30 seconds or more

Click here

B1454 Air Outlet Damper Cool Control Servo Motor Circuit (Passenger Side)

  • Diagnosis condition: During No. 2 air conditioning radiator damper servo sub-assembly (front passenger side lower air mix) operation

  • Malfunction status: The damper servo operation request signal is output but the position information of the servo does not change or servo is malfunctioning

  • Detection time: Continuously for 30 seconds or more

Click here

B1455 Air Outlet Damper FOOT/DEF Control Servo Motor Circuit (Passenger Side)

  • Diagnosis condition: During No. 3 air conditioning radiator damper servo sub-assembly (MODE FOOT) (for LHD) or the No. 1 air conditioning radiator damper servo sub-assembly (MODE FOOT) (for RHD) operation

  • Malfunction status: The damper servo operation request signal is output but the position information of the servo does not change or ervo is malfunctioning

  • Detection time: Continuously for 30 seconds or more

Click here

B1461 Emission Gas NOx Sensor Circuit

  • Diagnosis condition: None

  • Malfunction status: Short in smog ventilation sensor circuit

  • Detection time: Continuously for 4 seconds or more (Present malfunction), although only when the power switch off → on (IG) continuously 28 seconds or more

Click here

B1471 A/C Inverter High Voltage Power Resource System Malfunction

  • Diagnosis condition: Power switch on (READY)

  • Malfunction status: Open or short in A/C inverter high voltage power resource system

  • Detection time: None

Click here

B1472 A/C Inverter High Voltage Output System Malfunction

  • Diagnosis condition: Compressor operation

  • Malfunction status: Open or short in A/C inverter high voltage output system

  • Detection time: None

Click here

B1473 A/C Inverter Start-up Signal System Malfunction

  • Diagnosis condition: Power switch on (READY)

  • Malfunction status: Any of the following conditions are met;


    • High voltage from hybrid vehicle control ECU assembly is unavailable

    • Air conditioning refrigerant pressure malfunction

    • Compressor with motor assembly malfunction

  • Detection time: Present malfunction

Click here

B1474 A/C Inverter Malfunction

  • Diagnosis condition: Power switch on (READY)

  • Malfunction status: The inverter internal temperature is outside the specified range (exceeds the maximum)

  • Detection time: None

Click here

B1475 A/C Inverter Cooling / Heating System Malfunction

  • Diagnosis condition: Power switch on (READY)

  • Malfunction status: Outside base temperature in the Inverter (unreasonable temperature)

  • Detection time: None

Click here

B1476 A/C Inverter Load System Malfunction

  • Diagnosis condition: Compressor operation request

  • Malfunction status: Motor rotation load while the compressor is operating is too large or too small

  • Detection time: None

Click here

B1477 A/C Inverter Low Voltage Power Resource System Malfunction

  • Diagnosis condition: Power switch on (READY)

  • Malfunction status: An open or short to ground in the inverter control power voltage circuit

  • Detection time: None

Click here

B1497 Communication Malfunction (Bus Ic)

  • Diagnosis condition: None

  • Malfunction status: Error or open in communication line between air conditioning amplifier assembly and servo motor

Click here

B1498 Communication Malfunction (A/C Inverter Local)

  • Diagnosis condition: Power switch on (READY)

  • Malfunction status: Error or open in communication line between the hybrid vehicle control ECU and compressor with motor assembly or high-voltage power source shut off

Click here

B14A8 Glass Temperature Sensor Circuit

  • Diagnosiscondition: Power switch on (IG)

  • Malfunctionstatus: Communication between rain sensor (galss humidity sensor) and main body ECU (multiplex network body ECU) is abnormal or stops

  • Detection time: Continuously for 5 seconds or more after turning power switch on (IG) after progress 10 seconds.

Click here

B14A9 Glass Surroundings Temperature Sensor Circuit

  • Diagnosiscondition: Power switch on (IG)

  • Malfunctionstatus: Communication between rain sensor (galss humidity sensor) and main body ECU (multiplex network body ECU) is abnormal or stops

  • Detection time: Continuously for 5 seconds or more after turning power switch on (IG) after progress 10 seconds.

Click here

B14AA Glass Humidity Sensor Circuit

  • Diagnosiscondition: Power switch on (IG)

  • Malfunctionstatus: Communication between rain sensor (galss humidity sensor) and main body ECU (multiplex network body ECU) is abnormal or stops

  • Detection time: Continuously for 5 seconds or more after turning power switch on (IG) after progress 10 seconds.

Click here

B14B2 Lost Communication with Front Panel LIN

Lost communication with air conditioning control assembly


  • Diagnosis condition: Power switch on (IG)

  • Malfunction status: Lost communication with integration control and panel assembly

  • Detection time: Continuously for 10 seconds or more

Click here

B14B8 Refrigerant Shortage

  • Diagnosis condition: At the time of quantity of refrigerant opinion on infringement condition establishment by the ordinary control

  • Malfunction status: When following condition is detected in refrigerant shortage check in normal operation; Amount of refrigerant is insufficient

  • Detection time: During air conditioning system operation for 10 minutes or more

Click here

B14B9 Open in Ion Generator Circuit

  • Diagnosis condition: Power switch on (IG), blower switch on, ion generator switch on

  • Malfunction status: Open or short in ion generation circuit

  • Detection time: Continuously for 12 seconds or more

Click here

P1C7C49 Hybrid/EV Battery Voltage System Isolation (A/C Area) Internal Electronic Failure High voltage system insulation malfunction

Click here

U0131 Lost Communication with Power Steering Control Module No communication with power steering ECU assembly

Click here

U0142 Lost Communication with Main Body ECU No communication with main body ECU (multiplex network body ECU)

Click here

U0151 Lost Communication with Restraints Control Module No communication with airbag sensor assembly

Click here

U0155 Lost Communication with Combination Meter No communication with combination meter assembly

Click here

U0163 Lost Communication with Navigation Control Module No communication with radio receiver assembly

Click here

U0293 Lost Communication with HV ECU No communication with hybrid vehicle control ECU assembly

Click here