GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Exterior Lights System Check?

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Go to Step 2

Go to Exterior Lights System Check

2

  1. Disconnect the inoperative bulb.
  2. Inspect the bulb.
  3. Repeat this test as needed for each inoperative bulb.

Is the bulb open?

--

Go to Step 3

Go to Step 4

3

Replace the bulb.

Is the repair complete?

--

Go to Exterior Lights System Check

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4

Connect a test lamp between the BLK wire at the lamp socket and battery B+.

Does the test lamp light?

--

Go to Step 6

Go to Step 5

5

Locate and repair the open in BLK wire.

Is the repair complete?

--

Go to Exterior Lights System Check

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6

  1. For pickup models, connect a test lamp between the cavity A at the lamp socket and ground.
  2. For utility models, connect a test lamp between the cavity C at the lamp socket and ground.
  3. Turn the ignition switch to the RUN position.
  4. Select the appropriate direction on the turn signal switch.

Does the test lamp light?

--

Go to Step 7

Go to Step 8

7

Replace the bulb.

Is the repair complete?

--

Go to Exterior Lights System Check

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8

Locate and repair the open in the lamp feed circuit.

Is the repair complete?

--

Go to Exterior Lights System Check

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