DTC P0504-00: Brake Switch Circuit Problem: Notes

DTC P0504:00 (PCM, SKYACTIV-G 2.0) DETECTION CONDITION AND POSSIBLE CAUSE

DTC P0504:00	Brake switch circuit problem
DETECTION CONDITION	The condition in which the brake switch No. 1 and No. 2 signals are both on or off continues for 3 s or more and the condition is repeated 5 times. Diagnostic support note This is a continuous monitor (CCM). The check engine light illuminates if the PCM detects the above malfunction condition during the first drive cycle. FREEZE FRAME DATA/Snapshot data is available. DTC is stored in the PCM memory.
FAIL-SAFE FUNCTION	Not applicable
POSSIBLE CAUSE	CAUTION: Inspect the brake switch with it installed to the brake pedal, otherwise the brake switch may not operate normally. If the brake switch is removed from the brake pedal, replace the brake switch with a new one. Brake switch connector or terminals malfunction Short to ground or open circuit in brake switch No. 1 power supply circuit: Short to ground in wiring harness between MAIN 200 A fuse and brake switch terminal A MAIN 200 A fuse and/or STOP 10 A fuse malfunction Open circuit in wiring harness between battery positive terminal and brake switch terminal A Open circuit in wiring harness between brake switch terminal B and body ground Short to ground in wiring harness between the following terminals: Brake switch terminal D-PCM terminal 2AB Brake switch terminal C-PCM terminal 2P PCM connector or terminals malfunction Short to power supply in wiring harness between the following terminals: Brake switch terminal D-PCM terminal 2AB Brake switch terminal C-PCM terminal 2P Open circuit in wiring harness between the following terminals: Brake switch terminal D-PCM terminal 2AB Brake switch terminal C-PCM terminal 2P Brake switch malfunction PCM malfunction

Courtesy of MAZDA MOTORS CORP.