Diagnostic Starting Point - Body Control System

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Diagnostic Starting Point - Body Control System
WARNING: This page is about a different car, the 2003 GMC Sonoma, 2003 GMC Jimmy, 2003 Chevrolet S10 Pickup, and 2003 Chevrolet Blazer. However, it is still accessible from the selected car via links, so may be relevant.

Begin the diagnosis of the body control system by performing the diagnostic system check for the system in which the customer concern is apparent.

The diagnostic system check will direct you to the correct procedure for diagnosing the system and where the procedure is located.

Fig 1: Scan Tool Output Controls
G01476531Courtesy of GENERAL MOTORS CORP.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.