GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

DEFINITION: This table applies to remote compact disc (CD) players and remote cassette tape players with one or more audio channels inoperative.

1

Did you review the radio/audio system operation and perform the necessary inspections?

--

Go to Step 2

Go to Symptoms

2

Verify that one or more of the speakers are inoperative.

Do the speakers operate normally?

--

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

Go to Step 3

3

Are both right and left channels inoperative?

--

Go to Step 4

Go to Step 7

4

Important: The audio signal can be identified as a fluctuating AC voltage. Measure from the channel input cavity to the channel common ground cavity.

  1. Turn the ignition switch to the ACC position.
  2. Play a known good medium.
  3. Test for the audio signal input to the radio.

Is the audio signal present at both inputs?

0-400 mV AC

Go to Step 14

Go to Step 5

5

Test CKT 372 (BLK/WHT) for an open.

Is an open present in CKT 372 (BLK/WHT)?

--

Go to Step 6

Go to Step 15

6

Repair the open in CKT 372 (BLK/WHT). Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 16

--

7

Is the right audio channel inoperative?

--

Go to Step 8

Go to Step 11

8

Important: The audio signal can be identified as a fluctuating AC voltage. Measure from the channel output cavity to the channel common ground cavity.

  1. Turn the ignition switch to the ACC position.
  2. Play a known good medium.
  3. Test for right channel audio signal output at the remote audio player.

Is the right channel audio signal present?

0-400 mV AC

Go to Step 9

Go to Step 15

9

Test CKT 368 (DK GRN/WHT) for an open.

Is an open present in CKT 368 (DK GRN/WHT)?

--

Go to Step 10

Go to Step 14

10

Repair the open in CKT 368 (DK GRN/WHT). Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 16

--

11

Important: The audio signal can be identified as a fluctuating AC voltage. Measure from the channel output cavity to the channel common ground cavity.

  1. Turn the ignition switch to the ACC position.
  2. Play a known good medium.
  3. Test for left channel audio signal output at the remote audio player.

Is the left channel audio signal present?

0-400 mV AC

Go to Step 12

Go to Step 15

12

Test CKT 368 (DK GRN/WHT) for an open.

Is an open present in CKT 368 (DK GRN/WHT)?

--

Go to Step 13

Go to Step 14

13

Repair the open in CKT 368 (DK GRN/WHT). Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 16

--

14

Service the radio. Refer to Radio Replacement .

Is service of the radio complete?

--

Go to Step 16

--

15

Service the remote audio player. Refer to Remote CD Changer Replacement or Remote Tape Player Replacement .

Is service of the remote audio player complete?

--

Go to Step 16

--

16

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 3