PCM/ECM sets DTC P0504 if the PCM/ECM detects signal of the brake warning lamp and brake switch do not correlate within the predetermined time.
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
Plausibility check between Brake Light Switch(BLS) and Brake Test Switch(BTS) | 1. Open or short circuit in harness 2. Poor connection or damaged harness 3. Faulty brake warning lamp or brake test switch |
Enable Conditions |
•
Engine running | |
Threshold Value |
•
Time between brake light switch and brake test switch do not correlate longer than > 10 sec | |
Diagnostic Time |
•
12 times brake pedal activation | |
MIL On Condition |
•
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