GM Service Manual Online
For 1990-2009 cars only

Diagnostic Instructions

    • Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
    • Review Strategy Based Diagnosis for an overview of the diagnostic approach.
    •  Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Audio Amplifier B+

1

1

--

--

CD Changer B+

1, 2

1, 2

--

--

Front Center Speaker Output (+)

1

1

1

--

Front Center Speaker Output (-)

1

1

1

--

Left Front Midrange Speaker Output (+)

1

1

1

--

Left Front Midrange Speaker Output (-)

1

1

1

--

Left Front Subwoofer Speaker Output (+)

1

1

1

--

Left Front Subwoofer Speaker Output (-)

1

1

1

--

Left Seat Speaker Output (+)

1

1

1

--

Left Seat Speaker Output (-)

1

1

1

--

Right Front Midrange Speaker Output (+)

1

1

1

--

Right Front Midrange Speaker Output (-)

1

1

1

--

Right Front Subwoofer Speaker Output (+)

1

1

1

--

Right Front Subwoofer Speaker Output (-)

1

1

1

--

Right Seat Speaker Output (+)

1

1

1

--

Right Seat Speaker Output (-)

1

1

1

--

Audio Amplifier Ground

--

1

--

--

CD Changer Ground

--

1, 2

--

--

1. Speaker Malfunction

2. Compact Disk Inoperative

Circuit/System Description

The CD changer is supplied with battery voltage from the RADIO, S-BAND/VCIS fuse located in the body control module (BCM). The radio provides the CD changer with right and left low level audio signal circuits (+) and (-). The audio signal circuits are DC bias voltage circuits that are one half of the battery voltage. When using a DMM, each of the audio signal circuits will measure approximately 6.5V DC. Ground for the CD changer id provided at G104.

Reference Information

Schematic Reference

Radio/Navigation System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Radio/Audio System Description and Operation

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Radio ON, verify the CD changer operates properly and audio can be heard from the speakers.

If the CD changer operates properly and audio is inoperative or distorted from one or all of the speakers, refer to Speaker Malfunction .

Circuit/System Testing

  1. Ignition OFF, disconnect the X1 harness connector at the CD changer.
  2. Test for less than 10 ohms between the ground circuit terminal 1 and ground.
  3. If greater than the specified range, test the ground circuit for an open/high resistance.
  4. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 16 and ground.
  5. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  6. If all circuits test normal, replace the CD changer.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Remote CD Changer Replacement