GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

Important: A short to ground will cause an open fuse(s). Before performing this diagnostic procedure, inspect the fuse(s) for an open.

1

  1. Disconnect the right vanity mirror lamp connector.
  2. Use a DMM in order to measure the resistance between terminal B of the vanity mirror lamp and ground.

Does the resistance measure within the specified range?

0-2 ohms

Go to Step  2

Go to Step  3

2

Use the DMM in order to measure the voltage between terminal A of the vanity mirror lamp connector and ground.

Does the voltage measure to the specified value?

B+

Go to Step  4

Go to Step  5

3

Repair the open in CKT 750 between the right vanity mirror lamp and ground splice pack G401. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Interior Lamps System Check

--

4

Replace the right vanity mirror lamp. Refer to RH Vanity Mirror Lamp in Roof.

Is the repair complete?

--

Go to Interior Lamps System Check

--

5

Use the DMM in order to backprobe the left IP junction block connector C3. Measure the voltage between terminal C4 and ground.

Does the voltage measure to the specified value?

B+

Go to Step  6

Go to Step  7

6

Repair the open in CKT 1732 between the left IP junction block and the right vanity mirror lamp. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Interior Lamps System Check

--

7

Replace the left IP junction block. Refer to Relay/Fuse Center Replacement in Wiring Systems.

Is the repair complete?

--

Go to Interior Lamps System Check

--