For 1990-2009 cars

# Body and Accessories

## All Component Locator

- Cellular Communication Components

## All Description and Operation

- OnStar Circuit Description
- OnStar Operation

## All Visual Identification

- Cellular Communication Connector End Views

## Diagnostic Procedures

- Diagnostic Starting Point
- OnStar Audio Malfunction
- OnStar Button LED Malfunction
- OnStar Button Malfunction
- OnStar Call Center Exterior Lamp Command Inoperative
- OnStar Call Center Horn Command Inoperative
- OnStar Call Center Lock/Unlock Commands Inoperative
- OnStar Call Center Unable to Configure OnStar (R) System
- OnStar Call Center Unable to Locate Vehicle
- OnStar Operator Unable to Hear Caller
- OnStar Reconfiguration
- OnStar System Check
- OnStar Will Not Power Up
- Symptoms
- Unable to Contact OnStar Call Center

## Diagnostic Trouble Codes

- Diagnostic Trouble Code (DTC) List/Type
- DTC B2462 GPS Signal Error
- DTC B2476 Cellular Phone Select Service Switch Malfunction
- DTC U1500 Inter-Device Dedicated Bus Malfunction

## Electrical/Electronic Schematic Diagrams

- Cellular Communication Schematic Icons
- Cellular Telephone Schematics
- OnStar Schematics

## General Diagnostic Information

- Scan Tool Data Definitions
- Scan Tool Data List

## Mechanical Specifications

- Fastener Tightening Specifications

## Other Specifications

- GM SPO Group Numbers

## Removal, Installation, and Replacement

- Mobile Telephone Antenna Replacement
- Mobile Telephone Microphone Replacement
- OnStar Button Assembly Replacement
- OnStar GPS Antenna Replacement
- OnStar Vehicle Communication Unit Replacement
- OnStar Vehicle Interface Unit Replacement