Diagnostic Test

CHECK FOR AN ACTIVE DIAGNOSTIC TROUBLE CODE (DTC)
1. Turn the ignition on.
2. With the scan tool, read DTCs.
  Does the scan tool display this DTC as active?
  
  Yes
  - Go To 2.
  No
  - Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.
  - Refer to STANDARD PROCEDURE and perform the BODY VERIFICATION TEST.
CHECK THE (L71) LEFT REAR PARK LAMP DRIVER CIRCUIT FOR A SHORT TO VOLTAGE IN THE HARNESS
1. Turn the Park Lamps off.
2. Turn the ignition off.
3. Disconnect the Left Tail Lamp Assembly harness connector.
4. Disconnect the BCM C2 harness connector.
5. Turn the ignition on.
6. Measure the voltage between ground and the (L71) Left Rear Park Lamp Driver circuit.
  Is there any voltage present?
  
  Yes
  - Repair the short to voltage in the (L71) Left Rear Park Lamp Driver circuit.
  - Refer to STANDARD PROCEDURE and perform the BODY VERIFICATION TEST.
  No
  - Go To 3.
CHECK THE (L77) LEFT FRONT PARK LAMP DRIVER CIRCUIT FOR A SHORT TO VOLTAGE IN THE HARNESS
1. Turn the ignition off.
2. Disconnect the Left Front Park/Turn Lamp harness connector.
3. Disconnect the BCM C1 harness connector.
4. Turn the ignition on.
5. Measure the voltage between ground and the (L77) Left Front Park Lamp Driver circuit.
  Is there any voltage present?
  
  Yes
  - Repair the short to voltage in the (L77) Left Front Park Lamp Driver circuit.
  - Refer to STANDARD PROCEDURE and perform the BODY VERIFICATION TEST.
  No
  - Replace the BCM in accordance with the Service Information. Refer to MODULE, BODY CONTROL, REMOVAL .
  - Refer to STANDARD PROCEDURE and perform the BODY VERIFICATION TEST.