Certain GM models equipped with parking assist may exhibit a non-operative system. Affected vehicles include 2006-2008 Buick Lucerne, 2008-2009 Buick Enclave, 2006-2008 Cadillac DTS, 2007-2009 Cadillac Escalade and SRX, 2008-2010 Cadillac CTS, 2007-2009 Chevy Avalanche, Silverado, Suburban and Tahoe, 2009 Chevy Traverse, 2007-2009 GMC Sierra, Acadia, Yukon and Yukon XL, and 2007-2009 Saturn Outlook. DTC B1E3A may be stored.
This may be caused by a malfunctioning object sensor or a circuit failure on the eight-volt reference circuit. The eight-volt reference circuit serves all of the object sensors in parallel. A fault anywhere on the circuit or in any single sensor will affect all of the sensors. When a single sensor malfunctions, the shared eight-volt reference circuit may be compromised, resulting in a DTC for each sensor.
Important: Do not replace all of the sensors and/or the object alarm module.
If normal diagnosis does not reveal any concerns with the park assist system, perform the following diagnostic procedure: