GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Backup Lights System Check?

--

Go to Step 2

Go to Backup Lamp System Check

2

Disconnect the body control module (PZM) connector C2.

Do the backup lamps turn off?

--

Go to Step 6

Go to Step 3

3

Remove the reverse relay from the rear compartment relay center 5.

Do the backup lamps turn off?

--

Go to Step 4

Go to Step 7

4

Inspect CKT 646 (DK GRN) for a short to ground. Refer to Testing for Short to Ground in Wiring Systems.

Is CKT 646 OK?

--

Go to Step 5

Go to Step 8

5

Replace the reverse relay.

Is the repair complete?

--

Go to Backup Lamp System Check

--

6

Replace the body control module (PZM). Refer to Body Control Module Replacement in Body Control Systems.

Is the repair complete?

--

Go to Backup Lamp System Check

--

7

Repair the short to battery positive voltage (B+) in CKT 24 (LT GRN). Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Backup Lamp System Check

--

8

Repair the short to ground in CKT 646 (DK GRN). Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Backup Lamp System Check

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