GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Inspect the MALL/RADIO/DIC fuse.

Is the fuse open?

--

Go to Step 10

Go to Step 2

2

Inspect the RADIO fuse.

Is the fuse open?

--

Go to Step 11

Go to Step 3

3

  1. Disconnect the radio harness connectors.
  2. Use a test lamp in order to backprobe between the radio harness connector C1 terminal 10 and ground.

Does the test lamp light?

--

Go to Step 4

Go to Step 9

4

Use a test lamp in order to backprobe between the radio harness connector C1 terminal 5.

Does the test lamp light?

--

Go to Step 5

Go to Step 6

5

  1. Turn the ignition switch to the RUN position.
  2. Use a test lamp in order to backprobe between the radio harness connector C1 terminal 9 and terminal 5.

Does the test lamp light?

--

Go to Step 7

Go to Step 8

6

Repair the faulty connection or the open in CKT 351 between the radio harness connector C1 terminal 5 and G201.

Is the repair complete?

--

Go to Radio/Audio System Check

--

7

Service the radio. Refer to Radio Replacement .

Is the repair complete?

--

Go to Radio/Audio System Check

--

8

Repair the faulty connection or the open in CKT 43 between S227 and the radio harness connector C1 terminal 9.

Is the repair complete?

--

Go to Radio/Audio System Check

--

9

Repair the faulty connection or the open in CKT 640 between S202 and the radio harness connector C1 terminal 10.

Is the symptom still present?

--

Go to Radio/Audio System Check

--

10

Repair the short to ground in CKT 43.

Is the repair complete?

--

Go to Radio/Audio System Check

--

11

Repair the short to ground in CKT 640.

Is the repair complete?

--

Go to Radio/Audio System Check

--