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Circuit/System Testing

WARNING: This page is about a different car, the 2012 Buick LaCrosse. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at each of the object sensors.
  2. Ignition ON, transmission in REVERSE, test for 7.2-9.2 V between the object sensor supply voltage circuit terminal 1 at the B78G Rear Object Sensor - Left Outer harness connector and ground.
    • If less than the specified range, test the object sensor supply voltage circuit for a short to ground. If the circuit tests normal, replace the K41 Front and Rear Parking Assist Control Module.
    • If greater than the specified range, test the object sensor supply voltage circuit for a short to voltage. If the circuit tests normal, replace the K41 Front and Rear Parking Assist Control Module.
  3. Install each object alarm sensor harness connector one at a time, checking DTCs after each sensor is connected. Verify DTC B1405 is not set as current.
    • If the DTC is set, replace the object alarm sensor that was connected immediately before the DTC set.
  4. If all circuits test normal, replace the K41 Front and Rear Parking Assist Control Module.
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