DTC P0504-00: Brake Switch System: Circuit Malfunction

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P0504-00: (PCM - VIN Y) DETECTION CONDITION AND POSSIBLE CAUSE

System malfunction location	Brake switch system: Circuit malfunction
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.
Fail-safe	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. DTCs are stored in the PCM. (P0571-00:) (See P0571-00: .) Sub relay malfunction (Refer to RELAY LOCATION (VIN Y) in the service information.) (Refer to RELAY INSPECTION in the service information.) Malfunction in wiring harness (including connector/terminal) between battery and brake switch (see CIRCUIT INSPECTION .) (see CONNECTOR INSPECTION .) Malfunction in wiring harness (including connector/terminal) between brake switch and body ground (see CIRCUIT INSPECTION .) (see CONNECTOR INSPECTION .) Malfunction in wiring harness (including connector/terminal) between brake switch and body control module (BCM) (see CIRCUIT INSPECTION .) (see CONNECTOR INSPECTION .) Malfunction in wiring harness (including connector/terminal) between brake switch and PCM (see CIRCUIT INSPECTION .) (see CONNECTOR INSPECTION .) Malfunction in wiring harness (including connector/terminal) between body control module (BCM) and PCM (see CIRCUIT INSPECTION .) (see CONNECTOR INSPECTION .) Brake switch malfunction (Refer to applicable BRAKE SWITCH INSPECTION in the service information.) Body control module (BCM) malfunction (Refer to applicable BODY CONTROL MODULE (BCM) INSPECTION in the service information.) PCM malfunction (Refer to applicable PCM REMOVAL/INSTALLATION (VIN Y) in the service information.)
Repeatability verification procedure	Clear the DTC recorded in the memory. (see CLEARING DTC .) Replicate the vehicle conditions at the time the DTC was detected using the following procedure. Switch the ignition ON (engine off). After depressing the brake pedal for 3 s or more, perform the operation of depressing and releasing the brake pedal 5 times. Perform the DTC inspection for the PCM. (See DTC INSPECTION .)

G16378227

Courtesy of MAZDA MOTORS CORP.

PCM COMPONENT OPERATIONS

Component No.	Refer to
1	Battery
2	Brake switch
3	Body control module (BCM)
4	PCM