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 inside rearview mirror lamps are inoperative.

Do the inside rearview mirror lamps operate normally?

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

Go to Step 3

3

  1. Disconnect the inside rearview mirror lamp.
  2. Connect a test lamp from CKT 1732 (ORN) from one of the following inside rearview mirror cavities to ground. Refer to Circuit Testing in Wiring Systems.
  3. • Cavity C (non-electrochromatic mirror)
    • Cavity 7 (electrochromatic mirror)

Does the test lamp light?

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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?

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Go to Step 10

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5

  1. Connect a test lamp between the following cavities. Refer to Circuit Testing in Wiring Systems.
  2. • Cavity A and cavity C (non-electrochromatic mirror).
    • Cavity 6 and cavity 7 (electrochromatic mirror).
  3. Open the front door.

Does the test lamp illuminate?

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Go to Step 7

Go to Step 6

6

Locate and repair the open or high resistance in CKT 156 (WHT). Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

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Go to Step 10

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7

Connect a test lamp between the following cavities. Refer to Circuit Testing in Wiring Systems.

    • Cavity B and cavity C (non-electrochromatic mirror).
    • Cavity 2 and cavity 7 (electrochromatic mirror).

Does the test lamp illuminate?

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Go to Step 9

Go to Step 8

8

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

Is the repair complete?

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Go to Step 10

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9

Replace the inside rearview mirror lamp. Refer to Rearview Mirror Lamp Replacement .

Is the repair complete?

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Go to Step 10

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10

Operate the system in order to verify the repair.

Did you correct the condition?

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System OK

Go to Step 3