GM Service Manual Online
For 1990-2009 cars only

Exterior Lamps Inoperative One

Step

Action

Value(s)

Yes

No

1

Was the entire exterior lights system check performed?

--

Go to Step 2

Go to Exterior Lights System Check

2

  1. Disconnect the inoperative lamp.
  2. Turn the parklamps on.
  3. Connect a test light between the inoperative lamp connector terminal circuit 9 and the inoperative lamps ground circuit.

Does the test light illuminate?

--

Go to Step 3

Go to Step 4

3

Replace the inoperative lamp. Refer to Side Marker Lamp Bulb Replacement Park/Turn Signal Lamp Bulb Replacement Tail Lamp Bulb Replacement

Is the repair complete?

--

Go to Step 7

--

4

Connect a test light between the inoperative lamp connector terminal circuit 9 and ground.

Does the test light illuminate?

--

Go to Step 5

Go to Step 6

5

Repair the poor connection or open in the inoperative lamps ground circuit.

Is the repair complete?

--

Go to Step 7

--

6

Repair the poor connection or open in circuit 9.

Is the repair complete?

--

Go to Step 7

--

7

  1. Turn the ignition switch to the OFF position.
  2. Reconnect all connectors /components removed.

Have all repairs been made?

--

Go to Exterior Lights System Check

--

Exterior Lamps Inoperative All

Step

Action

Value(s)

Yes

No

1

Was the entire exterior lights system check performed?

--

Go to Step 2

Go to Exterior Lights System Check

2

  1. Disconnect the headlamp switch.
  2. Connect a test light between the headlamp switch connector terminal C and B+.

Does the test light illuminate?

--

Go to Step 3

Go to Step 4

3

  1. Repair a short to ground in circuit 9.
  2. Replace the TAIL LP fuse.

Is the repair complete?

--

Go to Step 9

--

4

Connect a test light between the headlamp switch connector terminal H and ground.

Does the test light illuminate?

--

Go to Step 5

Go to Step 6

5

  1. Reconnect the headlamp switch.
  2. Connect a test light between the headlamp switch terminal C and ground.
  3. Turn the parklamps on.

Does the test light illuminate?

--

Go to Step 7

Go to Step 8

6

Repair the poor connection or open in circuit 240.

Is the repair complete?

--

Go to Step 9

--

7

Repair the poor connection or open in circuit 9.

Is the repair complete?

--

Go to Step 9

--

8

Replace the headlamp switch. Refer to Headlamp Switch Replacement

Is the repair complete?

--

Go to Step 9

--

9

  1. Turn the ignition switch to the OFF position.
  2. Reconnect all connectors /components removed.

Have all repairs been made?

--

Go to Exterior Lights System Check

--