GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Interior Lights Schematics

Connector End View Reference: Master Electrical Component List in Wiring Systems

1

Did you perform the Diagnostic Systems Check?

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

2

Turn ON the rearview mirror reading lamps.

Do the lamps illuminate?

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

Go to Step 3

3

  1. Disconnect the inside rearview mirror.
  2. Probe the battery positive voltage supply circuit of the inside rearview mirror reading lamp with the test lamp connected to ground.

Does the test lamp illuminate?

Go to Step 4

Go to Step 5

4

Connect a test lamp between the switched battery positive voltage supply circuit of the inside rearview mirror reading lamp and the ground circuit.

Does the test lamp illuminate?

Go to Step 7

Go to Step 6

5

Repair the poor connection, or an open in the inside rearview mirror reading lamp. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 8

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6

Repair the poor connection, or an open in the ground circuit of the inside rearview mirror reading lamp. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 8

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7

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

Did you complete the replacement?

Go to Step 8

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8

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3