Circuit/System Description
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2011 GMC Yukon XL, 2011 GMC Yukon, 2011 Chevrolet Tahoe, 2011 Chevrolet Suburban, and 2011 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
When the ignition is turned ON, the parking assist control module and the side object sensors receive the vehicle identification number (VIN) from the body control module. The control modules will compare the VIN received to the VIN stored in memory.