OnStar Schematics

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2002 GMC Yukon XL, 2002 GMC Yukon, 2002 Chevrolet Tahoe, 2002 Chevrolet Suburban, and 2002 Cadillac Escalade EXT. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Power, Ground & Serial Data Schematic

Courtesy of GENERAL MOTORS CORP.

Fig 2: Communication Signals & Control Schematic

Courtesy of GENERAL MOTORS CORP.

Fig 3: Radio Interrupt & Broadcast Signals - YE9 w/o Remote Playback Device - CD Player Schematic

Courtesy of GENERAL MOTORS CORP.

Fig 4: Radio Interrupt & Broadcast Signals - YE9 w/Remote Playback Device - CD Player Schematic

Courtesy of GENERAL MOTORS CORP.

Fig 5: Radio Interrupt & Broadcast Signals - w/Y91 Schematic

Courtesy of GENERAL MOTORS CORP.