P0703

DTC P0703

Circuit Description

The brake switch is used to indicate brake pedal status to the transmission 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.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC P0703 Brake Switch Circuit

Conditions for Setting the DTC

* Brake switch stuck to closed
* Brake switch wiring harness shortage to ground
* 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.
* The TCM assumes that the brake light is always active.

Conditions for Clearing the Hold Lamp/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.