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

Does the radio display vary with the dimming control?

--

Go to Step 3

Go to Step 4

3

Activate the radio display buttons.

Does the radio display respond when you press the buttons?

--

Go to Step 6

Go to Step 7

4

  1. Remove the radio. Refer to Radio Replacement .
  2. Turn the ignition to the RUN position.
  3. Turn the radio to the ON position.
  4. Use a DMM in order to backprobe from the radio connector C1, cavity 6 to ground.
  5. Turn the Headlamp Switch to the PARK position.

Is battery voltage present?

--

Go to Step 5

Go to Step 8

5

  1. Place the ignition in the RUN position.
  2. Turn the radio to the ON position.
  3. Use a DMM in order to backprobe from the radio connector C1, cavity 7 to ground.
  4. Turn the headlamp dimmer switch back and forth.

Is voltage within the specified range?

0-10 Volts

Go to Step 7

Go to Step 9

6

Refer to Testing for Electrical Intermittents in Wiring Systems.

Is the repair complete?

--

Go to Radio/Audio System Check

--

7

Send the radio in for repair.

Is the repair complete?

--

Go to Radio/Audio System Check

--

8

Repair the open in CKT 1382 (PPL/WHT) between the radio connector C2 and the headlamp panel dimmer switch. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Radio/Audio System Check

--

9

Repair the open in CKT 8 (GRY) between the radio connector C1 and the IP fuse block. Refer to Wiring Repairs .

Is the repair complete?

--

Go to Radio/Audio System Check

--