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.

Did you find and correct the condition?

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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