GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Radio/Audio System Schematics

Connector End Views Reference: Entertainment Connector End Views

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

2

  1. Insert a CD magazine with at least 1 audio CD into the CD player.
  2. Turn ON the ignition, with the engine OFF.
  3. Turn ON the radio.
  4. Play the CD in the CD player.

Does the CD player play without noise?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

3

Is noise present only on one channel?

Go to Step 4

Go to Step 5

4

Test the output circuit of the suspect channel for a short, high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 10

Go to Step 8

5

Test the shield ground circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 10

Go to Step 6

6

Test the common output circuit for a short, high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 10

Go to Step 7

7

Inspect the audio harness shield for damage.

Did you find and correct the condition?

Go to Step 10

Go to Step 8

8

  1. Disconnect the CD player.
  2. Inspect for poor connections at the harness connector of the CD player. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 10

Go to Step 9

9

Replace the CD player. Refer to Remote CD Changer Replacement .

Did you complete the replacement?

Go to Step 10

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10

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2