Stoplight Switch

WARNING: This page is about a different car, the 1988 Buick Riviera and 1988 Buick Reatta. However, it is still accessible from the selected car via links, so may be relevant.

Brake light switch input is provided to EBCM pin 12 when brake pedal is being depressed. This alerts EBCM to increase sensitivity to wheel sensor input signals. This input consists of a 12-volt signal on circuit No. 20 of the normally open brake light switch.

Fig 1: Miscellaneous EBCM Inputs Schematic

Fig 2: Flow Chart B6, Miscellaneous EBCM Inputs

Fig 3: Flow Chart B6, Miscellaneous EBCM Inputs (1 of 2)

Fig 4: Flow Chart B6, Miscellaneous EBCM Inputs (2 of 2)