GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Check the RADIO-HVAC fuse.

Is the RADIO-HVAC fuse open?

--

Go to Step 10

Go to Step 2

2

Check the RADIO-CRUISE fuse.

Is the RADIO-CRUISE fuse open?

--

Go to Step 11

Go to Step 3

3

  1. Disconnect the radio harness connector.
  2. Using a test light, backprobe between the radio harness connector terminal F1 and ground.

Is the test light on?

--

Go to Step 4

Go to Step 9

4

Using a test light, backprobe between the radio harness connector terminal F1 and terminal E16.

Is the test light on?

--

Go to Step 5

Go to Step 6

5

  1. Using a test light, backprobe between the radio harness connector terminal F2 and terminal E16.
  2. Turn the ignition switch on.

Is the test light on?

--

Go to Step 7

Go to Step 8

6

Repair poor connection or open in circuit  351.

Is the repair complete?

--

Go to Diagnostic System Check - Radio/Audio System

--

7

Service the radio. Refer to Radio Replacement for service procedure.

Is the repair complete?

--

Go to Diagnostic System Check - Radio/Audio System

--

8

Repair poor connection or open in circuit 43.

Is the repair complete?

--

Go to Diagnostic System Check - Radio/Audio System

--

9

Repair poor connection or open in circuit 640.

Is the repair complete?

--

Go to Diagnostic System Check - Radio/Audio System

--

10

Repair short to ground in circuit 640.

Is the repair complete?

--

Go to Diagnostic System Check - Radio/Audio System

--

11

Repair short to ground in circuit 43.

Is the repair complete?

--

Go to Diagnostic System Check - Radio/Audio System

--