Brake light switch
WARNING: This page is about a different car, the 2003 Saab 9-3 and 2002 Saab 9-3. However, it is still accessible from the selected car via links, so may be relevant.
When the brake pedal is depressed, the normally open pair of contacts in the brake light switch will close and B+ will be applied on control module pin 63.
Brake light information is used by the control module to:
- disengage cruise control
- enable engine torque limitation
- enable diagnosis of the speed signal.