Circuit Description
WARNING: This page is about a different car, the 2006 Chevrolet Monte Carlo and 2006 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.
When the PRNDL is placed in the REVERSE position, a signal is sent to the body control module (BCM). The message indicates that the gear selector is in the REVERSE position. The BCM then applies voltage through the backup lamps supply voltage circuit illuminating the left and right backup lamps.