Circuit/System Description
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2008 GMC Yukon XL, 2008 GMC Yukon, 2008 Chevrolet Tahoe, 2008 Chevrolet Suburban, and 2008 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
The rearview camera image display module receives a 12-volt signal from the body control module (BCM) indicating that the vehicle is in reverse gear. When this signal is detected the rearview camera image display module will provide a regulated 6-volt power source to the rearview camera. The rearview image will then be displayed on the radio.
If a proper video signal is not detected, the radio will display a SERVICE REQUIRED notification on the radio display.