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 to the ON position.

Do the courtesy/reading lamps illuminate?

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

Go to Step 3

3

Use the courtesy/reading lamp switches to operate the lamps.

Do the courtesy/reading lamps illuminate?

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Go to Step 4

Go to Courtesy or Reading Lamps Inoperative with Lamp Switch

4

  1. Disconnect the inside rearview mirror connector.
  2. Connect a test lamp between the inside rearview mirror connector terminal C and ground. Refer to Circuit Testing in Wiring Systems.
  3. Open the driver door.

Does the test lamp illuminate?

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Go to Step 5

Go to Step 8

5

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

Does the test lamp illuminate?

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Go to Step 6

Go to Step 9

6

Test for and repair a poor connection at the inside rearview mirror connector terminal C and terminal A. 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 10

Go to Step 7

7

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

Did you complete the replacement?

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Go to Step 10

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8

Repair an open or a poor connection in circuit 149 between the inside rearview mirror and S241. Refer to Wiring Repairs or Connector Repairs in Wiring Systems.

Did you complete the repair?

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Go to Step 10

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9

Repair an open or a poor connection in circuit 156 between the inside rearview mirror and S247. Refer to Wiring Repairs or Connector Repairs in Wiring Systems.

Did you complete the repair?

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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