On-Vehicle Inspection [08/2013 - ]
WARNING: This page is about a different car, the 2014 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.
- INSPECT STOP LIGHT SWITCH ASSEMBLY
- Disconnect the A28 connector from the stop light switch assembly.
- Measure the voltage and resistance according to the value(s) in the table below.
Standard Voltage
Tester Connection Condition Specified Condition A28-1 (B) - A28-3 (GND) Power switch off 11 to 14 V A28-5 (B) - A28-3 (GND) Power switch on (IG) 11 to 14 V Standard Resistance
Tester Connection Condition Specified Condition A28-3 (GND) - Body ground Always Below 1 Ω TEXT IN ILLUSTRATION*a Front view of wire harness connector
(to Stop Light Switch Assembly)If the result is not as specified, repair or replace the wire harness or connector.
- Reconnect the A28 connector to the stop light switch assembly.
- Measure the voltage according to the value(s) in the table below.
Standard Voltage
Tester Connection Condition Specified Condition A28-2 (L) - A28-3 (GND) Power switch off, brake pedal not depressed Below 1 V A28-2 (L) - A28-3 (GND) Power switch off, brake pedal depressed 11 to 14 V A28-4 (L) - A28-3 (GND) Power switch on (IG), brake pedal not depressed 11 to 14 V A28-4 (L) - A28-3 (GND) Power switch on (IG), brake pedal depressed Below 1 V TEXT IN ILLUSTRATION*a Component with harness connected
(Stop Light Switch Assembly)If the result is not as specified, replace the stop light switch assembly.