GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Lighting Systems Diagnostic System Check?

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Go to Step 2

Go to Diagnostic System Check - Lighting Systems

2

  1. Disconnect the underhood lamp connector.
  2. Turn ON the ignition, with the engine OFF.
  3. Turn ON the headlamps.
  4. Connect a test lamp between the underhood lamp power feed circuit and a good ground.

Does the test lamp illuminate?

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Go to Step 3

Go to Step 6

3

Connect a test lamp between the underhood lamp power feed circuit and the underhood lamp ground circuit.

Does the test lamp illuminate?

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Go to Step 4

Go to Step 7

4

Inspect for poor connections at the underhood lamp connector. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

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Go to Step 8

Go to Step 5

5

Replace the underhood lamp. Refer to Underhood Lamp Replacement .

Is the underhood lamp replacement complete?

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Go to Step 8

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6

Repair the open in power circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Is the circuit repair complete?

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Go to Step 8

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7

Repair the open in ground circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Is the circuit repair complete?

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Go to Step 8

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8

Operate the system in order to verify the repair.

Did you find and correct the condition?

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System OK

Go to Step 2