GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Outside Rearview Mirror Schematics

1

Did you review the Heated Mirror Description and Operation and perform the necessary inspections?

Go to Step 2

Go to Symptoms - Doors

2

  1. Turn ON the ignition, with the engine OFF.
  2. Depress the rear window defogger switch.

Does the rear window defogger operate normally?

Go to Step 3

Go to Rear Window Defogger Inoperative

3

Do the heated mirrors operate normally?

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

Go to Step 4

4

Are both heated mirrors inoperative?

Go to Step 5

Go to Step 8

5

Inspect the HTD MIR fuse.

Is the HTD MIR fuse open?

Go to Step 6

Go to Step 10

6

Check the mirror heating element supply voltage circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 13

Go to Step 7

7

Check both of the power mirrors for an internal short to ground. Replace the mirror(s) as necessary. Refer to Power Mirror Replacement .

Did you complete the repair?

Go to Step 13

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8

  1. Disconnect the inoperative mirror.
  2. Connect a test lamp between the mirror heating element supply voltage circuit at the inoperative mirror and ground.
  3. Depress the rear defogger switch to activate the system.

Does the test lamp illuminate?

Go to Step 9

Go to Step 10

9

With the system still active, connect a test lamp between the mirror heating element supply voltage circuit and the mirror ground circuit.

Does the test lamp illuminate?

Go to Step 12

Go to Step 11

10

Repair the open in the mirror heating element supply voltage circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 13

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11

Repair the open in the mirror ground circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 13

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12

Replace the power mirror. Refer to Power Mirror Replacement .

Did you complete the repair?

Go to Step 13

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13

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3