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Air Conditioning System DTCS

AIR CONDITIONING SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) LIST

DTC Detection item Condition when trouble detected (DTC is determined when following condition detected)
B1502 Inside Air Temperature Sensor Circuit Malfunction Signal voltage of inside air temperature sensor is higher than specification.
Signal voltage of inside air temperature sensor is lower than specification.
B1503 Evaporator Temperature Sensor Circuit Malfunction Signal voltage of evaporator temperature sensor is higher than specification.
Signal voltage of evaporator temperature sensor is lower than specification.
B1504 Sun load Sensor Circuit Malfunction
  • Signal voltage of sun load sensor is higher than specification.
  • Without sunlight.
Signal voltage of sun load sensor is lower than specification.
B1511 Temperature Control Actuator (Position Sensor) and/or Its Circuit Malfunction Signal voltage of position sensor included in temperature control actuator is higher than specification.
Signal voltage of position sensor included in temperature control actuator is lower than specification.
B1512 Air Flow Control Actuator (Position Sensor) and/or Its Circuit Malfunction Signal voltage of position sensor included in airflow control actuator is higher than specification.
Signal voltage of position sensor included in airflow control actuator is lower than specification.
B1513 Temperature Control Actuator (Motor) and/or Its Circuit Malfunction Motor of temperature control actuator is not operated more than specified time.
B1514 Air Flow Control Actuator (Motor) and/or Its Circuit Malfunction Motor of air flow control actuator is not operated more than specified time.
B1520 Temperature Selector Malfunction Signal voltage of temperature selector in HVAC control module is higher than specification.
Signal voltage of temperature selector in HVAC control module is lower than specification.
B1521 Blower Speed Selector Malfunction Signal voltage of blower speed selector in HVAC control module is higher than specification.
Signal voltage of blower speed selector in HVAC control module is lower than specification.
B1522 Air Flow Selector Malfunction Signal voltage of airflow selector in HVAC control module is higher than specification.
Signal voltage of airflow selector in HVAC control module is lower than specification.
B1541 Back-up Power Supply Circuit Malfunction
  • Back-up power supply voltage of HVAC control module is higher than or lower than specification.
  • When connect battery with vehicle and then, turn ignition switch to ON position for first time.
B1546 A/C Refrigerant Pressure Malfunction
  • Signal voltage of outside air temperature sensor is more than specified value. However, A/C refrigerant pressure is less than specified value.
  • Insufficient refrigerant in A/C system.
B1551 Serial Communication Circuit Malfunction Circuit voltage of serial communication circuit is higher than specification.
Circuit voltage of serial communication circuit is lower than specification.
B1552 HVAC Control Module Check Sum Error HVAC control module received unspecified data from BCM more than 8 times.
B1553 CAN Communication Circuit Malfunction HVAC control module received signal indicating reception error from ECM.
B1557 VSS Signal Failure HVAC control module receives invalid data of VSS signal from BCM.
B1561 ECT signal Failure HVAC control module receives invalid data of ECT signal from BCM.
B1562 Outside Temperature Sensor Signal Failure HVAC control module receives invalid data of outside air temperature sensor signal from BCM.
B1563 A/C Refrigerant Pressure Sensor Signal Failure HVAC control module receives invalid data of A/C refrigerant pressure sensor signal from BCM.
B1570 Engine Type Signal Failure HVAC control module receives invalid data of engine type signal from BCM.
B1571 Combination Meter Spec Signal Failure HVAC control module receives invalid data of combination meter Spec signal from BCM.
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