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

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 circuit 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 following circuits for an open, high resistance, or a short to ground. Refer to Circuit Testing and Wiring Repairs .

    •  backup lamp supply voltage
    •  backup lamp control circuit from the BCM Connector X 8 terminal 2.

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 affected backup lamp bulb. Refer to Tail Lamp Replacement .

Did you complete the replacement?

Go to Step 10

--

9

Replace the BCM. Refer to Control Module References for BCM 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