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

Step 1:

Steps 1 (continued)-15:

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