GM Service Manual Online
For 1990-2009 cars only

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

Go to Step 6

5

Test the backup lamp supply voltage and ground circuits for an open or high resistance. Refer to Circuit Testing and Wiring Repairs.

Did you find and correct a condition?

Go to Step 10

Go to Step 8

6

Test the backup lamp supply voltage circuit for the following:

    • An open
    • A high resistance
    • A short to ground

Refer to Circuit Testing and Wiring Repairs.

Did you find and correct a condition?

Go to Step 10

Go to Step 7

7

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 10

Go to Step 9

8

Replace the inoperative backup lamp bulb. Refer to Backup Lamp Bulb Replacement .

Did you complete the replacement?

Go to Step 10

--

9

Replace the BCM. Refer to Control Module References for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 10

--

10

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3