Circuit Description
WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. However, it is still accessible from the selected car via links, so may be relevant.
The body control module (BCM) supplies battery positive voltage to the center high mounted stop lamp (CHMSL) through the stop lamp supply voltage circuit when the brakes are applied. The stop lamp supply voltage circuit also supplies a signal to the powertrain control module (PCM) or engine control module (ECM) and the electronic brake control module (EBCM) for other functions, is a separate pin in the BCM connector and is internally connected within the BCM.