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Home >> Lexus >> 2019 >> RX 450h Base >> Repair and Diagnosis (Single Page) >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Air Conditioning System (Diagnostics - Introduction) (2 Of 2) >> Air Conditioning System >> Diagnostic Trouble Code Chart [03/2018 - 08/2019] >> Diagnostic Trouble Code Chart [03/2018 - 08/2019]
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Diagnostic Trouble Code Chart [03/2018 - 08/2019]

AIR CONDITIONING SYSTEM

DTC No. Detection Item DTC Detection Condition Link
B1411-11 Room Temperature Sensor Circuit Open or short in room temperature sensor circuit Refer to DTC B1411-11: Room Temperature Sensor Circuit [10/2015 - ]
B1412-12 Ambient Temperature Sensor Circuit Open or short in ambient temperature sensor circuit Refer to DTC B1412-12: Ambient Temperature Sensor Circuit [10/2015 - ]
B1413-13 Evaporator Temperature Sensor Circuit Open or short in evaporator temperature sensor circuit Refer to DTC B1413-13: Evaporator Temperature Sensor Circuit [10/2015 - ]
B1417-17 Evaporator Temperature Circuit Open or short in rear evaporator temperature sensor circuit Refer to DTC B1417-17: Evaporator Temperature Circuit [03/2018 - ]
B1418-18 Exhaust Gas Sensor Circuit Open or short in smog ventilation sensor circuit (HC, CO) Refer to DTC B1418-18: Exhaust Gas Sensor Circuit [10/2015 - ]
B1419-19 Rear Room Temperature Sensor Circuit Open or short in rear room temperature sensor circuit Refer to DTC B1419-19: Rear Room Temperature Sensor Circuit [03/2018 - ]
B1423-23 Pressure Sensor Circuit
  • Open or short in air conditioner pressure sensor circuit
  • Refrigerant pressure on high pressure side is extremely low (176 kPa (1.8 kgf/cm2 , 26 psi) or less) or extremely high (3025 kPa (30.8 kgf/cm2 , 439 psi) or more)
Refer to DTC B1423-23: Pressure Sensor Circuit [10/2015 - 08/2019]
B1441-41 Air Mix Damper Control Servo Motor Circuit (Passenger Side) Air mix damper position sensor value does not change even if air conditioning amplifier assembly operates No. 1 air conditioning radiator damper servo sub-assembly (front passenger side air mix) Refer to DTC B1441-41: Air Mix Damper Control Servo Motor Circuit (Passenger Side) [10/2015 - ]
B1442-42 Air Inlet Damper Control Servo Motor Circuit Air inlet damper position sensor value does not change even if air conditioning amplifier assembly operates No. 1 blower damper servo sub-assembly Refer to DTC B1442-42: Air Inlet Damper Control Servo Motor Circuit [10/2015 - ]
B1443-43 Air Outlet Damper Control Servo Motor Circuit Air outlet damper position sensor value does not change even if air conditioning amplifier assembly operates No. 3 air conditioning radiator damper servo sub-assembly Refer to DTC B1443-43: Air Outlet Damper Control Servo Motor Circuit [10/2015 - ]
B1446-46 Air Mix Damper Control Servo Motor Circuit (Driver Side) Air mix damper position sensor value does not change even if air conditioning amplifier assembly operates No. 1 air conditioning radiator damper servo sub-assembly (driver side air mix) Refer to DTC B1446-46: Air Mix Damper Control Servo Motor Circuit (Driver Side) [10/2015 - ]
B1447-47 Air Mix Damper Control Servo Motor Circuit (Rear) Air outlet damper position does not change when the air conditioning amplifier assembly operates the rear No. 2 cooling unit damper servo sub-assembly Refer to DTC B1447-47: Air Mix Damper Control Servo Motor Circuit (Rear) [03/2018 - ]
B1448-48 Passenger Side FACE Servo Motor Circuit Air outlet damper position sensor value does not change even if air conditioning amplifier assembly operates No. 1 air conditioning radiator damper servo sub-assembly (front passenger side mode) Refer to DTC B1448-48: Passenger Side FACE Servo Motor Circuit [10/2015 - ]
B1449-49 Rear Air Outlet Damper Control Servo Motor Circuit Air mix damper position sensor value does not change even if air conditioning amplifier assembly operates No. 2 air conditioning radiator damper servo sub-assembly Refer to DTC B1449-49: Rear Air Outlet Damper Control Servo Motor Circuit [10/2015 - ]
B1461-61 Emission Gas NOx Sensor Circuit Open or short in emission gas NOx sensor circuit Refer to DTC B1461-61: Emission Gas NOx Sensor Circuit [10/2015 - ]
B1471-71 A/C Inverter High Voltage Power Resource System Malfunction
  • Open or short in A/C inverter high voltage power resource system
  • Boost inverter malfunctioning
Refer to DTC B1471-71: A/C Inverter High Voltage Power Resource System Malfunction [10/2015 - ]
B1472-72 A/C Inverter High Voltage Output System Malfunction Open or short in A/C inverter high voltage output circuit Refer to DTC B1472-72: A/C Inverter High Voltage Output System Malfunction [10/2015 - ]
B1473-73 A/C Inverter Start-up Signal System Malfunction Open or short in A/C inverter start-up signal circuit Refer to DTC B1473-73: A/C Inverter Start-up Signal System Malfunction [10/2015 - ]
B1474-74 A/C Inverter Malfunction A/C inverter malfunction Refer to DTC B1474-74: A/C Inverter Malfunction [10/2015 - ]
B1475-75 A/C Inverter Cooling / Heating System Malfunction A/C inverter temperature outside specified range (temperature too high) or open or short to ground in temperature sensor circuit Refer to DTC B1475-75: A/C Inverter Cooling / Heating System Malfunction [10/2015 - 08/2019]
B1476-76 A/C Inverter Load System Malfunction Motor rotation load while compressor is operating is too large or too small Refer to DTC B1476-76: A/C Inverter Load System Malfunction [10/2015 - 08/2019]
B1477-77 A/C Inverter Low Voltage Power Resource System Malfunction Open or short to ground in inverter control power voltage circuit Refer to DTC B1477-77: A/C Inverter Low Voltage Power Resource System Malfunction [10/2015 - ]
B1486-86 Air Outlet Damper Control Servo Motor Circuit (Driver Side Front A/C Rear Air Flow) Rear air outlet damper position sensor value does not change even if air conditioning amplifier assembly operates rear No. 1 cooling unit damper servo sub-assembly Refer to DTC B1486-86: Air Outlet Damper Control Servo Motor Circuit (Driver Side Front A/C Rear Air Flow) [03/2018 - 08/2019]
B1497-97 BUS IC Communication Malfunction Error or open in communication line Refer to DTC B1497-97: BUS IC Communication Malfunction [03/2018 - 08/2019]
B1498-98 Communication Malfunction (A/C Inverter Local)
  • Error or open in communication line between the hybrid vehicle control ECU assembly and compressor with motor assembly
  • High-voltage power source shut off
Refer to DTC B1498-98: Communication Malfunction (A/C Inverter Local) [10/2015 - ]
B14A8 Glass Temperature Sensor Circuit Open or short in glass temperature sensor circuit Refer to DTC B14A8: Glass Temperature Sensor Circuit; DTC B14A9: Glass Surroundings Temperature Sensor Circuit; DTC B14AA: Glass Humidity Sensor Circuit [10/2015 - ]
B14A9 Glass Surroundings Temperature Sensor Circuit Open or short in glass surroundings temperature sensor circuit Refer to DTC B14A8: Glass Temperature Sensor Circuit; DTC B14A9: Glass Surroundings Temperature Sensor Circuit; DTC B14AA: Glass Humidity Sensor Circuit [10/2015 - ]
B14AA Glass Humidity Sensor Circuit Open or short in glass humidity sensor circuit Refer to DTC B14A8: Glass Temperature Sensor Circuit; DTC B14A9: Glass Surroundings Temperature Sensor Circuit; DTC B14AA: Glass Humidity Sensor Circuit [10/2015 - ]
B14B3 Lost Communication with Rear Panel LIN Lost communication with No. 2 air conditioning control assembly Refer to DTC B14B3: Lost Communication with Rear Panel LIN [03/2018 - ]
B14B8 Refrigerant Shortage When following condition is detected in refrigerant shortage check in normal operation:
Amount of refrigerant is insufficient
Refer to DTC B14B8: Refrigerant Shortage [10/2015 - 08/2019]
P0AA6-611 Hybrid Battery Voltage System Isolation Fault High voltage system insulation malfunction Refer to DTC P0AA6-611: Hybrid Battery Voltage System Isolation Fault [10/2015 - 08/2019]
U0131 Lost Communication with Electric Power Steering ECU No communication with power steering ECU assembly Refer to DTC U0131: Lost Communication with Electric Power Steering ECU; DTC U0142: Lost Communication with Main Body ECU; DTC U0151: Lost Communication with Restraints Control Module; DTC U0155: Lost Communication with Combination Meter; DTC U0163: Lost Communication with Navigation Control Module; DTC U0293: Lost Communication with HV ECU [10/2015 - ]
U0142 Lost Communication with Main Body ECU No communication with main body ECU (multiplex network body ECU) Refer to DTC U0131: Lost Communication with Electric Power Steering ECU; DTC U0142: Lost Communication with Main Body ECU; DTC U0151: Lost Communication with Restraints Control Module; DTC U0155: Lost Communication with Combination Meter; DTC U0163: Lost Communication with Navigation Control Module; DTC U0293: Lost Communication with HV ECU [10/2015 - ]
U0151 Lost Communication with Restraints Control Module No communication with airbag sensor assembly Refer to DTC U0131: Lost Communication with Electric Power Steering ECU; DTC U0142: Lost Communication with Main Body ECU; DTC U0151: Lost Communication with Restraints Control Module; DTC U0155: Lost Communication with Combination Meter; DTC U0163: Lost Communication with Navigation Control Module; DTC U0293: Lost Communication with HV ECU [10/2015 - ]
U0155 Lost Communication with Combination Meter No communication with combination meter assembly Refer to DTC U0131: Lost Communication with Electric Power Steering ECU; DTC U0142: Lost Communication with Main Body ECU; DTC U0151: Lost Communication with Restraints Control Module; DTC U0155: Lost Communication with Combination Meter; DTC U0163: Lost Communication with Navigation Control Module; DTC U0293: Lost Communication with HV ECU [10/2015 - ]
U0163 Lost Communication with Navigation Control Module No communication with radio receiver assembly (A/C control panel) Refer to DTC U0131: Lost Communication with Electric Power Steering ECU; DTC U0142: Lost Communication with Main Body ECU; DTC U0151: Lost Communication with Restraints Control Module; DTC U0155: Lost Communication with Combination Meter; DTC U0163: Lost Communication with Navigation Control Module; DTC U0293: Lost Communication with HV ECU [10/2015 - ]
U0293 Lost Communication with HV ECU No communication with hybrid vehicle control ECU assembly Refer to DTC U0131: Lost Communication with Electric Power Steering ECU; DTC U0142: Lost Communication with Main Body ECU; DTC U0151: Lost Communication with Restraints Control Module; DTC U0155: Lost Communication with Combination Meter; DTC U0163: Lost Communication with Navigation Control Module; DTC U0293: Lost Communication with HV ECU [10/2015 - ]