GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

1

Was the Lighting Systems Diagnostic System Check performed?

Go to Step 2

Go to A Diagnostic System Check - Lighting Systems

2

Do the rearview mirror reading lamps operate properly with the lamp switches?

Go to Step 4

Go to Step 3

3

  1. Disconnect the rearview mirror reading lamps connector.
  2. Test for ground at terminal B of the connector. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Is ground present at the terminal?

Go to Step 4

Go to Step 7

4

Test for an open in CKT 1732 between the rearview mirror reading lamps assembly terminal C and the dome lamp assembly terminal B. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Was a condition found and corrected?

System OK

Go to Step 5

5

Test for an open in CKT 156 between the rearview mirror reading lamps assembly terminal A and the dome lamp assembly terminal A. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Was a condition found and corrected?

System OK

Go to Step 6

6

Replace the rearview mirror reading lamps assembly.

Is the repair complete?

System OK

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7

Repair the open in the ground CKT 150. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

System OK

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