Brake Light Switch

BRAKE LIGHT SWITCH
The brake light switch gives information to the Transmission Control Module (TCM) and the shift-lock relay.

When the brake pedal is applied, the brake light switch is activated and sends information to the TCM on pin 26, which results in the lock-up being disengaged. The activation results in battery positive voltage on pin 26.

On markets with a shift-lock function there is a circuit for the shift-lock relay and its electro-magnet. The selector lever is in position P during starting and can only be moved when the brake has been activated. When the brake pedal is engaged, this is registered by the brake light switch which controls the electro-magnet via pin 87 on the shift-lock relay.