GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Exterior Lights System Check?

--

Go to Step 2

Go to Exterior Lights System Check

2

Disconnect the lamp control module connector C1.

Do the park lamps turn off?

--

Go to Step 3

Go to Step 4

3

Inspect CKT 308 (GRY/BLK) for a short to ground. Refer to Testing for Short to Ground in Wiring Systems.

Is CKT 308 OK?

--

Go to Step 7

Go to Step 8

4

Disconnect the lamp control module connector C2.

Do the park lamps turn off?

--

Go to Step 5

Go to Step 6

5

Replace the lamp control module.

Is the repair complete?

--

Go to Exterior Lights System Check

--

6

Repair the short to voltage in CKT 9 (BRN). Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Exterior Lights System Check

--

7

Replace the headlamp switch. Refer to Multifunction Turn Signal Lever Replacement - On Vehicle in Steering Wheel and Column-Tilt.

Is the repair complete?

--

Go to Exterior Lights System Check

--

8

Repair the suspect wiring. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Exterior Lights System Check

--