Circuit/System Testing

Manual Transmission

1. Ignition ON, transmission in REVERSE, verify the engine control module (ECM) scan tool Reverse Position Switch parameter is Active.
   • If not the specified value, refer to Backup Lamps Malfunction (Manual Transmission) , Backup Lamps Malfunction (Automatic transmission) .
2. Verify the scan tool Park Assist System Status parameter displays Enable.
   NOTE:

   After completing the next step the vehicle might need to be driven in the forward direction at speed greater than 40 km/h (25 MPH).

   • If not the specified values, refer to Diagnostic Aids and the scan tool Park Assist Disable History parameters to determine the cause of the inhibit.
3. If all tests normal, replace the K41 Front and Rear Parking Assist Control Module.

Automatic Transmission

1. Ignition ON, transmission in REVERSE, verify the scan tool Park Assist System Status parameter displays Enable.
   NOTE:

   After completing the next step the vehicle might need to be driven in the forward direction at speed greater than 40 km/h (25 MPH).

   • If not the specified values, refer to Diagnostic Aids and the scan tool Park Assist Disable History parameters to determine the cause of the inhibit.
2. If all tests normal, replace the K41 Front and Rear Parking Assist Control Module.