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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 839 (Seat Belt System) >> Description and Operation >> Seat Belt System Description and Operation >> Front Seat Belt System Operation

Front Seat Belt System Operation

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.
CAUTION: To help avoid personal injury from unrepaired crash damage to a restraint system, perform the seat belt check for each seat belt system. Replace the seat belt system if there is any doubt about the condition of system components. 
  1. The front seat belt system consists of a driver and passenger seat belt retractor and buckle.
  2. The driver's seat belt has a seat belt switch mounted within the seat belt buckle. The seat belt switch communicates the status of the seat belt to the inflatable restraint sensing and diagnostic module (SDM). The SDM communicates the status of the seat belt to the instrument panel cluster (IPC) which controls a seat belt indicator and an audio alarm. When the driver's seat belt is buckled with the LF door closed and the ignition switch in the ON position, the following events occur:
    • The audio alarm will not operate.
    • The seat belt indicator will not operate.
  3. When the driver's seat belt is not buckled with the LF door closed and the ignition switch in the RUN position, the following events will occur:
    • The audio alarm will operate for 4 to 8 seconds and then turn OFF.
    • The seat belt indicator will operate for 20 seconds or until the driver's seat belt is buckled.
    • The seat belt indicator will flash for an additional 55 seconds before turning OFF.

    To diagnose further failure of the seat belt indicator Refer to SYMPTOMS - SEAT BELTS  or the audio alarm, refer to Audible Warnings in Instrument Panel, Gages and Console.

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