GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you review the automatic day/night mirrors circuit description and perform the necessary inspections?

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Go to Step 2

Go to Symptoms

2

Verify that the automatic day/night mirrors are inoperative in reverse.

Do the automatic day-night mirrors 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 rear view mirror (automatic day/night mirror) connector.
  2. With the ignition in the RUN position, place the transmission in reverse.
  3. Connect a test lamp from the inside rear view mirror (automatic day/night mirror) connector cavity 3 to ground.

Does the test lamp illuminate?

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Go to Step 5

Go to Step 4

4

Inspect the backup lights.

Do the backup lights function properly?

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Go to Step 6

Go to Backup Lamps Inoperative in Lighting Systems

5

Replace the inside rear view mirror (automatic day/night mirror). Refer to Inside Rearview Mirror Replacement .

Did you complete the repair?

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Go to Step 7

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6

Locate and repair the open in CKT 1324 (LT GRN) between the mirror and the VEH B/U lamp fuse. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

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Go to Step 7

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7

Operate the system in order to verify the repair.

Did you find and correct the condition?

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System OK

Go to Step 3