Operation Inside Rearview Mirror

WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

With the ignition ON, ignition voltage is supplied to the mirror from the HVAC 1 fuse in the I/P fuse block.
Ground for the mirror is provided by G203.