GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you review the system operation?

--

Go to Step 2

Go to

Symptoms

2

Inspect Fuse E1-E2.

Is Fuse E1-E2 open?

--

Go to Step 11

Go to Step 3

3

Inspect Fuse J7-J8.

Is Fuse J7-J8 open?

--

Go to Step 12

Go to Step 4

4

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

Does the test light illuminate?

--

Go to Step 5

Go to Step 10

5

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

Does the test light illuminate?

--

Go to Step 6

Go to Step 7

6

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

Does the test light illuminate?

--

Go to Step 8

Go to Step 9

7

Repair a poor connection or open in circuit 351.

Is the repair complete?

--

Go to Step 13

--

8

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

Is the repair complete?

--

Go to Step 13

--

9

Repair the poor connection or open in circuit 43.

Is the repair complete?

--

Go to Step 13

--

10

Repair a poor connection or open in circuit 640.

Is the repair complete?

--

Go to Step 13

--

11

Repair a short to ground in circuit 640.

Is the repair complete?

--

Go to Step 13

--

12

Repair a short to ground in circuit 43.

Is the repair complete?

--

Go to Step 13

--

13

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 1