GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Audible Warnings System Check?

--

Go to Step 2

Go to Audible Warnings System Check

2

Inspect the park lamps fuse in the engine wiring harness junction block 2.

Is the park lamps fuse open?

--

Go to Step 4

Go to Step 3

3

  1. Turn the ignition switch to the LOCK position.
  2. Disconnect the seat belt/ ignition key/ lamps alarm electrical connector.
  3. Connect a test lamp.
  4. Probe between the seat belt/ ignition key/ lamps harness connector terminal A1 and the ground.
  5. Turn the headlamp switch to the PARK or HEAD position while observing the test lamp.

Does the test light illuminate?

--

Go to Step 6

Go to Step 7

4

  1. Replace the park lamps fuse.
  2. Turn the headlamp switch to the park or head position.
  3. Inspect the park lamps fuse again.

Is the park lamps fuse open again?

--

Go to Step 5

Go to Step 10

5

Repair a short to ground in CKT 1340 or CKT 308.

Has the repair been made?

--

Go to Step 10

--

6

  1. Inspect the seat belt/ ignition key/ lamps alarm connector for a poor terminal contact.
  2. Replace the seat belt/ ignition key/ lamps alarm if the connector is good.
  3. Refer to Multifunction Alarm Module Replacement .

Has the repair been made?

--

Go to Step 10

--

7

  1. Use a test light to probe the headlamps switch terminal I and the ground.
  2. Turn the headlamp switch to HEAD or PARK.

Does the test light illuminate?

--

Go to Step 8

Go to Step 9

8

Repair a poor connection or an open in CKT 308.

Has the repair been made?

--

Go to Step 10

--

9

Replace the headlamp switch.

Has the repair been made?

--

Go to Step 10

--

10

  1. Make sure the ignition switch is in the LOCK position.
  2. Reconnect all connectors/components that have been disconnected.

Have all repairs been made?

--

Go to Audible Warnings System Check

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