On-Vehicle Inspection
WARNING: This page is about a different car, the 2007 Lexus ES 350. However, it is still accessible from the selected car via links, so may be relevant.
- INSPECT LIGHT FAILURE SENSOR
- Disconnect the R9 light failure sensor connector.
- Measure the voltage and resistance according to the value(s) in the table below.
Standard voltage
TESTER CONNECTION SPECIFIED CONDITIONTester Connection Condition Specified Condition R9-3 (+T) - R9-11 (E) Light control switch in TAIL 10 to 14 V Light control switch OFF Below 1 V R9-7 (+STP) - R9-11 (E) Brake pedal depressed 10 to 14 V Brake pedal released Below 1 V R9-8 (B) - R9-11 (E) Always 10 to 14 V Standard resistance
TESTER CONNECTION SPECIFIED CONDITIONTester Connection Condition Specified Condition R9-11 (E) - Body ground Always Below 1 Ω If the result is not as specified, there is a malfunction on the wire harness side.
- Reconnect the light failure indicator sensor connector.
- Measure the voltage according to the value(s) in the table below.
Standard voltage
TESTER CONNECTION SPECIFIED CONDITIONTester Connection Condition Specified Condition R9-2 (-STP) - Body ground) Brake pedal depressed 10 to 14 V Brake pedal released Below 1 V R9-5 (-TL) - Body ground) Light control switch in TAIL 10 to 14 V Light control switch OFF Below 1 V R9-9 (-TR) - Body ground) Light control switch in TAIL 10 to 14 V Light control switch OFF Below 1 V If the result is not as specified, repair or replace the wire harness between the sensor and bulb, or replace the light failure indicator sensor.