Circuit Description
WARNING: This page is about a different car, the 2002 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
The BCM provides an internal 12 volts reference used in three separate ratiometric comparisons to determine which steering wheel control switch and which rear wiper switch, if any, are activated.