GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Audible Warnings Diagnostic System Check?

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Go to Step 2

Go to Diagnostic System Check - Audible Warnings

2

  1. Connect a Scan Tool scan tool to the data link connector (DLC).
  2. Turn the ignition switch to the RUN position.
  3. Ensure that the headlamp switch is OFF.
  4. Select the instrument panel cluster (IPC) data list inputs.
  5. View the IPC headlamp switch input.
  6. Turn the headlamp switch to the ON position.

Is the scan tool input ON?

--

Go to Step 3

Go to Step 4

3

Perform the IPC Diagnostic System Check. Refer to Diagnostic System Check - Instrument Cluster .

Did you complete the inspection?

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Go to Diagnostic System Check - Audible Warnings

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4

  1. Verify that the ignition switch is in the OFF position.
  2. Remove the key from the ignition switch.
  3. Disconnect the headlamp switch connector C1 terminal A.

Is the warning chime on?

--

Go to Step 8

Go to Step 5

5

Connect a fused jumper between the headlamp switch connector C1 terminal A and ground.

Is the warning chime on?

--

Go to Step 7

Go to Step 6

6

  1. Repair the open in CKT 74 (LT BLU). Refer to Wiring Repairs in Wiring Systems.
  2. Test for a short in the battery. Refer to Battery Common Causes of Malfunction in Engine Electrical.

Did you complete the repair?

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Go to Diagnostic System Check - Audible Warnings

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7

Repair CKT 151 (BLK/WHT). Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Diagnostic System Check - Audible Warnings

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8

Inspect the headlamp switch connector C1 for proper terminal contact. Refer to Repairing Connector Terminals in Wiring Systems.

Did you complete the repair?

--

Go to Step 10

Go to Step 9

9

Repair the headlamp connector C1 terminal contact. Refer to Repairing Connector Terminals in Wiring Systems.

Did you complete the repair?

--

Go to Diagnostic System Check - Audible Warnings

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10

Replace the headlamp switch. Refer to Headlamp Switch Replacement in Lighting Systems.

Did you complete the repair?

--

Go to Diagnostic System Check - Audible Warnings

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