Circuit/System Verification

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2015 GMC Sierra 3500 HD, 2015 GMC Sierra 2500 HD, 2015 GMC Sierra 1500, 2015 Chevrolet Silverado 3500 HD, and 2015 Chevrolet Silverado 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.

Ignition ON.
Verify the scan tool Park Assist Switch parameter changes between Active and Inactive while pressing and releasing the parking assist switch.
- If the parameter does not change between Active and Inactive
  Refer to Circuit/System Testing - Parking Assist Switch Circuit Malfunction.
- If the parameter changes between Active and Inactive
Engine running, parking brake applied, transmission in R.
Verify the reverse lamps are illuminated.
- If the reverse lamps are not illuminated
  Refer to Backup Lamps Malfunction (Manual Transmission)Backup Lamps Malfunction (Automatic Transmission) .
- If the reverse lamps are illuminated
Verify the scan tool Parking Assist System Status parameter is Enabled.
- If the parameter is not Enabled
  Refer to Diagnostic Aids to determine the cause of the inhibit.
- If the parameter is Enabled
Verify the parking assist switch indicator turns ON and OFF when turning the parking assist system on and off with the park assist switch.
- If the indicator does not turn ON and OFF
  Refer to Circuit/System Testing - Parking Assist Switch Indicator Circuit Malfunction.
- If the indicator turns ON and OFF
All OK.