No park assist

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:

  1. Turn the ignition off and disconnect the harness connector at each of the park assist sensors (four sensor except the Cadillac DTS, which features eight sensors). Note that with all of the park assist sensor harness connectors disconnected, multiple sensor DTCs will set and will not clear. Ignore these DTCs.
  2. Turn the ignition on, and clear any DTCs. Verify that DTC B1E3A is not set after clearing the DTCs. If the DTC B1E3A is set, test the eight-volt reference circuit for a short to voltage/power or a short to ground. Ensure that each leg of the circuit is tested, since the eight-volt reference circuit feeds all sensors in parallel. Repair the faulty leg.
  3. !nstall each sensor harness connector one at a time, checking DTCs after each sensor is connected. Verify that DTC B1E3A is not set. If DTC B1E3A is set, replace the park assist sensor that was connected immediately before the DTC set. The sensors are available as P/N 15239247.
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