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

  1. Remove each roof marker lamp, one at a time. Refer to Roof Marker Lamp Replacement .
  2. Connect a self-powered test lamp between cavity B for CKT 250 (BLK) and ground.

Does the test lamp light?

--

Go to Step 3

Go to Step 6

3

  1. Connect a test lamp between cavity A for CKT 9 (BRN) at each roof marker lamp and ground.
  2. Place the headlamp and panel dimmer switch in the park lamps position.

Does the test lamp light?

--

Go to Step 7

Go to Step 8

4

Connect a test lamp between the headlamp and panel dimmer switch connector, cavity H, for CKT 240 (BRN) and ground.

Does the test lamp light?

--

Go to Step 5

Go to Step 9

5

  1. Place the headlamp switch in the park lamps position.
  2. Connect a test lamp between the headlamp and panel dimmer switch connector, cavity S, and ground.

Does the test lamp light?

--

Go to Step 10

Go to Step 11

6

Repair the open in CKT 250 (BLK) between the malfunctioning lamp and ground G200. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Exterior Lights System Check

--

7

Replace the malfunctioning bulb. Refer to Roof Marker Lamp Replacement .

Is the repair complete?

--

Go to Exterior Lights System Check

--

8

Repair the open in CKT 9 (BRN) between splice S210 and the lamps. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Exterior Lights System Check

--

9

Repair the open in CKT 240 (BRN) between the instrument panel fuse block and headlamp and panel dimmer switch. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Exterior Lights System Check

--

10

Repair the open in CKT 9 (BRN) between the headlamp and panel dimmer switch and splice S225. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Exterior Lights System Check

--

11

Replace the headlamp and panel dimmer switch. Refer to Multifunction, Turn Signal, and Hazard Switch Replacement - On Vehicle .

Is the repair complete?

--

Go to Exterior Lights System Check

--