GM Service Manual Online
For 1990-2009 cars only

License Lamps Inoperative One

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. Disconnect connector C407.
  2. Connect a test lamp between the license lamp connector, cavity B for CKT 150 (BLK), and B+.

Does the test lamp light?

--

Go to Step 3

Go to Step 4

3

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

Does the test lamp light?

--

Go to Step 5

Go to Step 6

4

Repair the open in CKT 150 (BLK) between the license lamp connector and ground G401. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Exterior Lights System Check

--

5

Replace the license lamp bulb. Refer to Rear License Lamp Replacement .

Is the repair complete?

--

Go to Exterior Lights System Check

--

6

Repair the open in CKT 9 (BRN) between splice S415 and the license lamp connector. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Exterior Lights System Check

--

License Lamps Inoperative Both

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

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

Does the test lamp light?

--

Go to Step 3

Go to Step 4

3

  1. Place the headlamp and panel dimmer 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 5

Go to Step 6

4

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

Is the repair complete?

--

Go to Exterior Lights System Check

--

5

Repair the open in CKT 9 (BRN) between the headlamp and panel dimmer switch and splice S210. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Exterior Lights System Check

--

6

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

--