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?

--

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

2

Verify that the visor vanity mirror lamps are inoperative.

Do the visor vanity mirror lamps operate normally?

--

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

Go to Step 3

3

Connect a test lamp from CKT 1732 (ORN) above the headliner at the LH or the RH visor vanity mirror to ground. Refer to Circuit Testing in Wiring Systems.

Does the test lamp light?

--

Go to Step 5

Go to Step 4

4

Locate and repair the open or high resistance in CKT 1732 (ORN). Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 8

--

5

Connect a test lamp between CKT 1850 (BLK) at the LH or the RH visor vanity mirror lamp and CKT 1735. Refer to Circuit Testing in Wiring Systems.

Does the test lamp light?

--

Go to Step 6

Go to Step 7

6

Replace the visor vanity mirror lamp. Refer to Vanity Mirror Lamp Replacement .

Is the repair complete?

--

Go to Step 8

--

7

Locate and repair the open or high resistance in CKT 1850 (BLK). Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 8

--

8

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 3