Diagnostic Trouble Code Chart

WARNING: This page is about a different car, the 2007 Lexus SC 430. However, it is still accessible from the selected car via links, so may be relevant.

If a trouble code is displayed during the DTC check, inspect the trouble areas listed for that code. For details of the code, refer to the "See page" below.

DIAGNOSTIC TROUBLE CODE CHART

DTC No.	Detection Item	Trouble Area	Memory*4
B1411/11	Room Temperature Sensor Circuit	Cooler (room temperature sensor) thermistor Wire harness A/C amplifier (A/C control)	Memorized (8.5 min. or more)*1
B1412/12	Ambient Temperature Sensor Circuit	Cooler (ambient temperature sensor) thermistor Wire harness ECM Multiplex communication circuit A/C amplifier (A/C control)	Memorized (8.5 min. or more)*2
B1413/13	Evaporator Temperature Sensor Circuit	No. 1 cooler thermistor Wire harness A/C amplifier (A/C control)	Memorized (8.5 min. or more)
B1418/18	Exhaust Gas Sensor Circuit	Cooler (sensor thermistor smog ventilation) Wire harness A/C amplifier (A/C control)	-
B1421/21	Solar Sensor Circuit (Passenger Side)	Automatic light control sensor Wire harness A/C amplifier (A/C control)	Memorized6 (8.5 min. or more) - 3, *7
B1422/22	Compressor Lock Sensor Circuit	Cooler compressor Cooler compressor drive belt Magnet clutch (Lock sensor) Wire harness Multiplex communication circuit ECM A/C amplifier (A/C control)	*5
B1423/23	Pressure Sensor Circuit	Pressure switch Wire harness Multiplex communication circuit Refrigerant pipe line ECM A/C amplifier (A/C control)	Memorized (8.5 min. or more)
B1424/24	Solar Sensor Circuit (Driver Side)	Automatic light control sensor Wire harness A/C amplifier (A/C control)	Memorized6 (8.5 min. or more) - 3, *7
B1431/31	Air Mix Damper Position Sensor Circuit (Passenger Side)	Air mix damper servo Wire harness A/C amplifier (A/C control)	-
B1432/32	Air Inlet Damper Position Sensor Circuit	Recirculation damper servo Wire harness A/C amplifier (A/C control)	Memorized (1 min. or more)
B1433/33	Air Outlet Damper Position Sensor Circuit	Mode damper servo Wire harness A/C amplifier (A/C control)	Memorized (1 min. or more)
B1436/36	Air Mix Damper Position Sensor Circuit (Driver Side)	Air mix damper servo Wire harness A/C amplifier (A/C control)	Memorized (1 min. or more)
B1441/41	Air Mix Damper Control Servo Motor Circuit (Passenger Side)	Air mix damper servo Wire harness A/C amplifier (A/C control)	Memorized (15 sec.)
B1442/42	Air Inlet Damper Control Servo Motor Circuit	Recirculation damper servo Wire harness A/C amplifier (A/C control)	Memorized (15 sec.)
B1443/43	Air Outlet Damper Control Servo Motor Circuit	Mode damper servo Wire harness A/C amplifier (A/C control)	Memorized (15 sec.)
B1446/46	Air Mix Damper Control Servo Motor Circuit (Driver Side)	Air mix damper servo Wire harness A/C amplifier (A/C control)	Memorized (15 sec.)
B1499/99	Multiplex Communication Circuit	Multiplex communication circuit	-
HINT: 1: If the room temperature is approximately -18.6°C (-1.48°F) or lower, DTC B1411/11 may be output even though the system is normal. 2: If the ambient temperature is approximately -52.9°C (-63.2°F) or lower, DTC B1412/12 may be output even though the system is normal. 3: If the check is being performed in a dark place, DTC B1421/21 or B1424/24 (solar sensor circuit abnormal) may be output. 4: The A/C amplifier memorizes the DTC (of the respective malfunction that has occurred) for the period of time indicated in the brackets. 5: Compressor lock (DTC B1422/22) is indicated only for a current malfunction. To confirm DTC B1422/22, perform the following steps. With the ignition switch ON, enter the DTC check mode. Press the R/F switch to enter the actuator check mode, and set the operation to Step No. 3. Press the AUTO switch to return to the DTC check mode. The DTC is displayed after approximately 3 seconds. 6: Short in circuit *7: Open in circuit