Circuit/System Verification

WARNING: This page is about a different car, the 2007 Hummer H2. However, it is still accessible from the selected car via links, so may be relevant.

To verify system operation, use one of the two methods provided.

Method A. Ignition ON, with the scan tool access the BCM menu, command the back up lamps ON.
Method B. Park brake applied, ignition ON, foot brake applied, transmission in REVERSE.