GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Power Door Systems Diagnostic System Check?

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Go to Step 2

Go to Diagnostic System Check - Power Door Systems

2

Verify that the heated mirror switch indicator is inoperative.

Does the heated mirror switch indicator operate normally?

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

Go to Step 3

3

Replace the heater and A/C controller. Refer to Control Assembly Replacement in HVAC Systems - Manual.

Did you complete the repair?

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Go to Step 4

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4

Operate the system in order to verify the system.

Did you find and correct the condition?

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System OK

Go to Step 3