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 park enable relay control circuit is a voltage output from the body control module (BCM) energizing the PARK ENABLE PCB relay in the left instrument panel junction block. Voltage is applied to the park enable relay control circuit under different circumstances for different subsystems depending on vehicle content. Refer to the applicable Description and Operation for a more detailed explanation of the control of the park enable relay control circuit.