P0703

DTC P0703: Brake Switch Circuit Malfunction





Circuit Description
The brake switch is used to indicate brake pedal status to the Transaxle Control Module (TCM). The brake switch is a normally open switch. Applying the brake pedal closes the switch, supplying voltage to the TCM. Releasing the brake pedal interrupts voltage to the TCM.

This DTC is stored at start-up. If the TCM receives a brake switch signal after start-up, the DTC will be stored in memory.

Conditions for Setting the DTC
^ Brake switch stuck to closed.
^ Brake switch wiring harness shortage to ground.
^ Brake switch wiring harness shortage to power.
^ Immediately after the above condition occurs.

Action Taken When the DTC Sets
^ No lamp control required but diagnostic information should be stored immediately when malfunction is detected.
^ TCM assume that the brake light always active.

Conditions for Clearing the MIL/DTC
Using a scan tool can clear history DTCs.

Diagnostic Aids
^ Inspect the poor wiring harness connection for TCM connectors and transaxle wiring connectors.
^ Inspect the improperly formed or damage terminals.

Troubleshooting

Steps 1-15: