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

Verify that the instrument cluster illumination lamps are always on.

Do the instrument cluster illumination lamps operate normally?

--

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

Go to Step 3

3

Are all of the other dimmable instrument panel components always on?

--

Go to Step 4

Go to Step 7

4

Remove the ILLUM fuse 12 in the IP Fuse Block.

Do the affected lamps remain on?

--

Go to Step 5

Go to Step 8

5

Test CKT 1220 (GRY) for short to voltage. Refer to Circuit Testing in Wiring Systems.

Was a problem found?

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Go to Step 6

Go to Step 7

6

Locate and repair the short to voltage in CKT 1220 (GRY). Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 11

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7

Replace the Instrument Cluster.

Refer to Instrument Cluster Replacement in Instrument Panel, Gauges and Console.

Is the repair complete?

--

Go to Step 11

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8

Remove the Headlamp Switch.

Do the affected lamps remain on?

--

Go to Step 9

Go to Step 10

9

Locate and repair the short to voltage in CKT 44 (DK GRN). Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 11

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10

Replace the Headlamp Switch. Refer to Headlamp Switch Replacement .

Is the repair complete?

--

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