Backup Lamps Inoperative

Step	Action	Yes	No
Schematic Reference: Exterior Lights Schematics Connector End View Reference: Lighting Systems Connector End Views or Data Communication Connector End Views
1	Did you perform the Diagnostic System Check - Vehicle?	Go to Step 2	Go to Diagnostic System Check - Vehicle
2	Verify that the backup lamps are inoperative. Do the backup lamps operate normally?	Go to Testing for Intermittent Conditions and Poor Connections	Go to Step 3
3	Is only one backup lamp inoperative?	Go to Step 5	Go to Step 4
4	Use the scan tool to check if there are any codes set in the current or history Powertrain DTC Information. Are any codes present?	Go to Diagnostic System Check - Vehicle i	Go to Step 6
5	Test the backup lamp supply voltage and ground circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct a condition?	Go to Step 9	Go to Step 7
6	Inspect for poor connections at the harness connector of the body control module (BCM). Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition?	Go to Step 9	Go to Step 8
7	Replace the affected backup lamp bulb or printed circuit board. Refer to Backup Lamp Bulb Replacement (GMC) or Tail Lamp Circuit Board Replacement . Did you complete the replacement?	Go to Step 9	-
8	Replace the BCM. Refer to Control Module References for replacement, setup and programming. Did you complete the replacement?	Go to Step 9	-
9	Operate the system in order to verify the repair. Did you correct the condition?	System OK	Go to Step 3