GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Diagnostic System Check?

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Go to Step 2

Go to Diagnostic System Check - Lighting Systems

2

  1. Turn the ignition to the RUN position.
  2. Turn the IP dimmer switch to the ON position.
  3. Turn the courtesy/reading lamps on using the switches.

Do the courtesy/reading lamps turn on?

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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 connector.
  2. Connect a test lamp between the inside rearview mirror connector terminal C and terminal B. Refer to Circuit Testing in Wiring Systems.

Does the test lamp illuminate?

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Go to Step 4

Go to Step 6

4

Test for and repair a poor connection at the inside rearview mirror connector terminal C and terminal B. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and repair a poor connection?

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Go to Step 7

Go to Step 5

5

Replace the inside rearview mirror. Refer to Inside Rearview Mirror Replacement .

Did you complete the replacement?

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Go to Step 7

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6

Repair the open in circuit 750 from the inside rearview mirror to S220. Refer to 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 correct the condition?

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System OK

Go to Step 3