GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

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

Do the courtesy reading lamps illuminate?

--

Go to Step 2

Go to Courtesy or Reading Lamps Inoperative with Lamp Switch

2

  1. Disconnect the inside rearview mirror connector.
  2. Connect a test lamp from inside rearview mirror connector terminal C to ground.
  3. Open the driver door.

Does the test lamp light?

--

Go to Step 3

Go to Step 5

3

Connect a test lamp from inside rearview mirror connector terminal C to terminal A.

Does the test lamp light?

--

Go to Step 4

Go to Step 6

4

  1. Test for a poor connection at the inside rearview mirror connector terminal C and terminal A.
  2. If the connections are OK, replace the inside rearview mirror. Refer to Inside Rearview Mirror Replacement .

Is the repair complete?

--

System OK

--

5

Repair the open or poor connection in circuit 149 between the inside rearview mirror and S241.

Is the repair complete?

--

System OK

--

6

Repair the open or poor connection in circuit 156 between the inside rearview mirror and S247.

Is the repair complete?

--

System OK

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