GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Interior Lights Schematics

Connector End View Reference: Master Electrical Component List in Wiring Systems

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

2

  1. Cover the sunload sensor assembly.
  2. Turn ON the courtesy lamps.
  3. Open and close the vanity mirror covers.

Do the vanity mirror lamps operate properly?

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

Go to Step 3

3

Do the courtesy lamps operate properly?

Go to Step 4

Go to Courtesy Lamps Inoperative

4

  1. Disconnect the inoperative vanity mirror lamp harness connector.
  2. Place the interior lamp switch in the ON position.
  3. Connect a test lamp between the courtesy lamp supply voltage circuit and the ground circuit of the inoperative vanity lamp.

Does the test lamp illuminate?

Go to Step 6

Go to Step 5

5

Test the courtesy lamp supply voltage circuit for an open, high resistance, or short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 9

Go to Step 7

6

Inspect for poor connections at the harness connector of the inoperative vanity mirror lamp. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 9

Go to Step 8

7

Locate and repair an open or high resistance in the ground circuit of the inoperative vanity mirror lamp. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 9

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8

Replace the sunshade. Refer to Sunshade Replacement in Interior Trim.

Did you complete the replacement?

Go to Step 9

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9

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2