Brake Light Switch: Description and Operation

Brake light switch
The brake light switch supplies the control module and the shift-lock relay with information.

Depressing the brake pedal will activate the brake light switch and send information to control module pin 36, which will disengage the lock-up function if the engine speed is below 2000 rpm. Activation puts B+ on pin 36.

The shift-lock function mechanically locks the gear lever in the P position when the engine is being started. Depressing the brake pedal checks the shift-lock relay and releases the mechanical lock.






Brake light switch not connected to bus






Brake light switch connected to bus






Wiring diagram, brake light switch not connected to bus






Wiring diagram, brake light switch connected to bus