For 1990-2009 cars

# Driver Information and Entertainment

## All Description and Operation

- OnStar Description and Operation
- Radio/Audio System Description and Operation

## Diagnostic Procedures

- Audio Distortion - One or More Speakers
- Compact Disc Inoperative
- Diagnostic Starting Point - Entertainment
- Radio Display Inoperative, No Sound from Speakers
- Radio Poor Reception
- Symptoms - Entertainment
- Tape Player Inoperative

## Diagnostic Trouble Codes

- DTC B1025, B1035, B1045, or B1055
- DTC B1446 or B1447
- DTC B2455
- DTC B2462
- DTC B2470
- DTC B2476

## Electrical/Electronic Schematic Diagrams

- Radio/Navigation System Schematics

## Mechanical Specifications

- Fastener Tightening Specifications

## Removal, Installation, and Replacement

- Cellular and Navigation Antenna Assembly Replacement
- Communication Interface Module Battery Replacement
- Communication Interface Module Replacement
- Front Upper Speaker Replacement
- Mobile Telephone Microphone Replacement
- OnStar Button Assembly Replacement
- Radio Antenna Module Replacement
- Radio Front Speaker Replacement
- Radio Rear Speaker Replacement
- Radio Replacement