General Information

Component Location





General Description

The Stop lamp switch is used to judge whether the acceleration system is abnormal or not. The stop lamp switch has a duplex system (signals brake test or brake light) to memorize the abnormality when the signals of depressing and releasing the brake pedal are detected simultaneously.

DTC Description

PCM sets DTC P0504 if the PCM detects signal of the brake warning lamp and brake switch do not correlate within the predetermined time.

DTC Detecting Condition





Diagnostic Circuit Diagram





Signal Waveform & Data




1. Brake Test Switch
2. Brake Light Switch