GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Has the Radio/Audio System Check been performed?

Go to Step 2

Go to Radio/Audio System Check

2

  1. Remove the rear stereo controller.
  2. Disconnect the rear stereo controller connector.
  3. Place the headlamp and panel dimmer switch in the park position.
  4. Connect a DMM between connector C1 Pin 6 and ground.

Is there battery voltage?

Go to Step 3

Go to Step 4

3

Remove the rear stereo controller and send for service.

Is the repair complete?

Go to Radio/Audio System Check

4

  1. Remove the headlamp and panel dimmer switch.
  2. Disconnect the headlamp and panel dimmer switch connector.
  3. Connect a DMM to pin of the headlamp and panel dimmer switch connector and to ground.

Is there battery voltage?

Go to Step 6

Go to Step 5

5

Locate and repair the open in CKT 1382 (PPL/WHT) between the IP fuse block and the headlamp and panel dimmer switch. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

Go to Radio/Audio System Check

6

Connect a DMM between pin N of the headlamp and panel dimmer switch and C1 pin 6 of the radio.

Is there continuity?

Go to Step 8

Go to Step 7

7

Replace the headlamp and panel dimmer switch. Refer to Headlamp Switch Replacement in Lighting Systems.

Is the repair complete?

Go to Radio/Audio System Check

8

Locate and repair the open in CKT 9 (BRN) between the rear stereo controller and the headlamp and panel dimmer switch. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

Go to Radio/Audio System Check