GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Inspect the RADIO BATT fuse for a open.

Is the RADIO BATT fuse open?

--

Go to Step 10

Go to Step 2

2

Inspect the RADIO fuse for a open.

Is the RADIO fuse open?

--

Go to Step 11

Go to Step 3

3

  1. Disconnect the radio harness connectors.
  2. Using a test light, backprobe between the radio harness connector C1 terminal 10 and ground.

Does the test light illuminate?

--

Go to Step 4

Go to Step 9

4

Using a test light, backprobe between the radio harness connector C1 and terminal 10 and terminal 5.

Does the test light illuminate?

--

Go to Step 5

Go to Step 6

5

  1. Using a test light, backprobe between the radio harness connector C1 terminal 9 and terminal 5.
  2. Turn the ignition switch to the RUN position.

Does the test light illuminate?

--

Go to Step 7

Go to Step 8

6

Repair a poor connection or open in circuit 351.

Is the repair complete?

--

Go to Diagnostic System Check - Radio/Audio System

--

7

Replace the radio. Refer to Radio Replacement .

Is the repair complete?

--

Go to Diagnostic System Check - Radio/Audio System

--

8

Repair the poor connection or open in circuit 43.

Is the repair complete?

--

Go to Diagnostic System Check - Radio/Audio System

--

9

Repair a poor connection or open in circuit 640.

Is the repair complete?

--

Go to Diagnostic System Check - Radio/Audio System

--

10

Repair a short to ground in circuit 640.

Is the repair complete?

--

Go to Diagnostic System Check - Radio/Audio System

--

11

Repair a short to ground in circuit 43.

Is the repair complete?

--

Go to Diagnostic System Check - Radio/Audio System

--