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System Description

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2003 GMC Yukon XL, 2003 GMC Yukon, 2003 Chevrolet Tahoe, 2003 Chevrolet Suburban, and 2003 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

This symptom table will enable the user to verify the customer complaint and narrow it to its source. If there is a concern with voice recognition or OnStar® steering wheel control function, technicians should proceed directly to the applicable diagnostic in SYMPTOMS - CELLULAR COMMUNICATION  .

IMPORTANT: To successfully diagnose and repair the OnStar® system it is necessary to comprehend its operation. Technicians should read and understand the ONSTAR DESCRIPTION AND OPERATION  before attempting to repair an OnStar® system.
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