GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Diagnostic System Check?

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Go to Step 2

Go to Diagnostic System Check - Lighting Systems

2

  1. Turn the ignition to the RUN position.
  2. Turn on the park lamps.
  3. Set the IP dimmer switch at the maximum intensity.

Do the instrument panel lamps illuminate at maximum intensity?

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Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

3

Connect a test lamp between the IP dimmer switch connector terminal D and ground. Refer to Circuit Testing in Wiring Systems.

Does the test lamp illuminate?

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Go to Step 8

Go to Step 4

4

Connect a test lamp between the IP dimmer switch connector terminal A and ground. Refer to Circuit Testing in Wiring Systems.

Does the test lamp illuminate?

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Go to Step 6

Go to Step 5

5

Repair the open in circuit 9 between the IP dimmer switch and S226. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

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Go to Step 11

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6

Test for and repair a poor connection at the IP dimmer switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and repair a poor connection?

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Go to Step 11

Go to Step 7

7

Replace the headlamp switch. Refer to Headlamp Switch Replacement .

Did you complete the replacement?

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Go to Step 11

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8

Connect a test lamp between the IP fuse block terminal E5 and ground. Refer to Circuit Testing in Wiring Systems.

Does the test lamp illuminate

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Go to Step 9

Go to Step 10

9

Repair the open in circuit 8 between the IP fuse block and S224. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

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Go to Step 11

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10

Repair the open in circuit 44 between the IP fuse block and the IP dimmer switch. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

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Go to Step 11

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11

Operate the system in order to verify the repair.

Did you correct the condition?

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System OK

Go to Step 3