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 park lamp relay.

Did the park lamps turn off?

--

Go to Step 3

Go to Step 4

3

Test CKT 991 for a short to ground.

Did you find a short to ground in CKT 991?

--

Go to Step 5

Go to Step 6

4

Replace the turn/hazard/headlamp switch. Refer to Multifunction, Turn Signal, and Hazard Switch Replacement - On Vehicle in Steering Wheel and Column - Standard.

Is the repair complete?

--

Go to Exterior Lights System Check

--

5

Repair a short to ground in CKT 991. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Exterior Lights System Check

--

6

Replace the park lamp relay.

Is the repair complete?

--

Go to Exterior Lights System Check

--