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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1633 (Cellular Communication System) >> Diagnostic Information and Procedures >> OnStar Symptom Diagnosis >> System Description

System Description

WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. 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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