LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2021 >> LS 500 Base, AWD >> Repair and Diagnosis >> Quick Lookups >> DTC Index >> DTC Index (2 Of 3) >> Heating / Air Conditioning DTCS >> Air Conditioning System
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Air Conditioning System

AIR CONDITIONING SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION [12/2017 - 10/2023]

DTC Code Description
B1411 Room Temperature Sensor Circuit
B1412 Ambient Temperature Sensor Circuit
B1413 Evaporator Temperature Sensor Circuit
B1418 Emission Gas Sensor Circuit
B1419 Rear Room Temperature Sensor Circuit
B1423 Pressure Sensor Circuit
B1441 Air Mix Damper Control Servo Motor Circuit (Passenger Side)
B1442 Air Inlet Damper Control Servo Motor Circuit
B1443 Air Outlet Damper Control Servo Motor Circuit
B1446 Air Mix Damper Control Servo Motor Circuit (Driver Side)
B1448 Passenger Side FACE Servo Motor Circuit
B144A Air Outlet DEF Damper Control Servo Motor Circuit
B1451 Compressor Solenoid Circuit
B1453 Air Outlet Damper Cool Control Servo Motor Circuit (Driver Side)
B1454 Air Outlet Damper Cool Control Servo Motor Circuit (Passenger Side)
B1455 Air Outlet Damper FOOT/DEF Control Servo Motor Circuit (Driver Side)
B1456 Air Outlet Damper FOOT/DEF Control Servo Motor Circuit(Passenger Side)
B1457 Driver Side Air Outlet Damper Control Servo Motor Circuit
B1458 Air Outlet Damper Control Servo Motor Circuit(Passenger Side Front A/C Rear Air Flow)
B1461 Emission Gas NOx Sensor Circuit
B1468 Room Temperature Sensor Circuit (Rear Passenger Side)
B1469 Infrared Ray Sensor Circuit
B1486 Driver Side Air Outlet Damper Control Servo Motor Circuit
B1487 Air Outlet Damper Control Servo Motor Circuit(Passenger Side Front A/C Rear Air Flow)
B148A Air Outlet Rear FOOT Damper Control Servo Motor Circuit (Driver Side)
B148B Air Outlet Rear FOOT Damper Control Servo Motor Circuit (Passenger Side)
B1492 Communication Malfunction (IR Sensor)
B1497 Communication Malfunction (Bus Ic)
B14A4 Solar Sensor Short Circuit(Rear Driver Side)
B14A8 Glass Temperature Sensor Circuit
B14A9 Glass Surroundings Temperature Sensor Circuit
B14AA Glass Humidity Sensor Circuit
B14B2 Lost Communication with Front Panel LIN
B14B3 Lost Communication with Rear Panel LIN
B14B8 Refrigerant Shortage
B14BD Refrigerant Overabundance Filling Malfunction
U0100 Communication Stop from ECM to Distance Control ECU, VSC
U0131 Lost Communication with Power Steering Control Module
U0142 Lost Communication with Main Body ECU
U0151 Lost Communication with Restraints Control Module
U0155 Lost Communication with Combination Meter
U0163 Lost Communication with Navigation Control Module
U0201 Lost Communication with "Door Control Module C"
U0202 Lost Communication with "Door Control Module D"
U0210 Lost Communication with "Seat Control Module C"
AIR CONDITIONING SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION [10/2023 - ]

DTC Code Description
B1411 Room Temperature Sensor Circuit
B1412 Ambient Temperature Sensor Circuit
B1413 Evaporator Temperature Sensor Circuit
B1418 Emission Gas Sensor Circuit
B1419 Rear Room Temperature Sensor Circuit
B1423 Pressure Sensor Circuit
B1441 Air Mix Damper Control Servo Motor Circuit (Passenger Side)
B1442 Air Inlet Damper Control Servo Motor Circuit
B1443 Air Outlet Damper Control Servo Motor Circuit
B1446 Air Mix Damper Control Servo Motor Circuit (Driver Side)
B1448 Passenger Side FACE Servo Motor Circuit
B144A Air Outlet DEF Damper Control Servo Motor Circuit
B1451 Compressor Solenoid Circuit
B1453 Air Outlet Damper Cool Control Servo Motor Circuit (Driver Side)
B1454 Air Outlet Damper Cool Control Servo Motor Circuit (Passenger Side)
B1455 Air Outlet Damper FOOT/DEF Control Servo Motor Circuit (Driver Side)
B1456 Air Outlet Damper FOOT/DEF Control Servo Motor Circuit(Passenger Side)
B1457 Driver Side Air Outlet Damper Control Servo Motor Circuit
B1458 Air Outlet Damper Control Servo Motor Circuit(Passenger Side Front A/C Rear Air Flow)
B1461 Emission Gas NOx Sensor Circuit
B1468 Room Temperature Sensor Circuit (Rear Passenger Side)
B1469 Infrared Ray Sensor Circuit
B1486 Driver Side Air Outlet Damper Control Servo Motor Circuit
B1487 Air Outlet Damper Control Servo Motor Circuit(Passenger Side Front A/C Rear Air Flow)
B148A Air Outlet Rear FOOT Damper Control Servo Motor Circuit (Driver Side)
B148B Air Outlet Rear FOOT Damper Control Servo Motor Circuit (Passenger Side)
B1492 Communication Malfunction (IR Sensor)
B1497 Communication Malfunction (Bus Ic)
B14A4 Solar Sensor Short Circuit(Rear Driver Side)
B14B2 Lost Communication with Front Panel LIN
B14B3 Lost Communication with Rear Panel LIN
B14B8 Refrigerant Shortage
B14BD Refrigerant Overabundance Filling Malfunction
U0100 Communication Stop from ECM to Distance Control ECU, VSC
U0131 Lost Communication with Power Steering Control Module
U0142 Lost Communication with Main Body ECU
U0151 Lost Communication with Restraints Control Module
U0155 Lost Communication with Combination Meter
U0163 Lost Communication with Navigation Control Module
U0201 Lost Communication with "Door Control Module C"
U0202 Lost Communication with "Door Control Module D"
U0210 Lost Communication with "Seat Control Module C"