Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Diagnostic Trouble Code Chart

B1411/11

Room Temperature Sensor Circuit

Open or short in room temperature sensor circuit

B1412/12

Ambient Temperature Sensor Circuit

Open or short in ambient temperature sensor circuit

B1413/13

Evaporator Temperature Sensor Circuit

Open or short in evaporator temperature sensor circuit

B1417/17

Evaporator Temperature Circuit

Open or short in rear evaporator temperature sensor circuit

B1418/18

Exhaust Gas Sensor Circuit

Open or short in smog ventilation sensor circuit (HC, CO) (w/ Smog Ventilation Sensor)

B1419/19

Rear Room Temperature Sensor Circuit

Open or short in rear room temperature sensor circuit

B1422/22

Compressor Lock Sensor Circuit

Open or short in A/C lock sensor circuit

B1423/23

Pressure Sensor Circuit

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)

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

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

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)

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.

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)

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

B1451/51

Compressor Solenoid Circuit

Open or short in compressor solenoid circuit

B1461/61

Emission Gas NOx Sensor Circuit

Open or short in emission gas NOx sensor circuit (w/ Smog Ventilation Sensor)

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

B1497/97

BUS IC Communication Malfunction

Error or open in communication line

B14B3

Lost Communication with Rear Panel LIN

Lost communication with No. 2 air conditioning control assembly

B14B8

Refrigerant Shortage

When following condition is detected in refrigerant shortage check in normal operation:

Amount of refrigerant is insufficient

U0100

Lost Communication with ECM

No communication with ECM

U0131

Lost Communication with Electric Power Steering ECU

No communication with power steering ECU assembly

U0142

Lost Communication with Main Body ECU

No communication with main body ECU (multiplex network body ECU)

U0151

Lost Communication with Restraints Control Module

No communication with airbag sensor assembly

U0155

Lost Communication with Combination Meter

No communication with combination meter assembly

U0163

Lost Communication with Navigation Control Module

No communication with radio receiver assembly (A/C control panel)