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Diagnostic System Check - SIR: Notes

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Refer to SIR Special Tool Caution in Cautions and Notices.

These diagnostic procedures will help you find and repair SIR system malfunctions. For best results, use the diagnostic tables and follow the sequence listed below:

  1. Refer to the diagnostic tables as directed by the Diagnostic System Check-SIR. The diagnostic tables will assist you in diagnosing SIR system malfunctions. Bypassing these procedures may result in the following:
    • Extended diagnostic time
    • Incorrect diagnosis
    • Incorrect parts replacement
  2. Repeat the Diagnostic System Check-SIR after you perform any repairs or diagnostic procedures. This will verify that you correctly performed the repair. This will also verify that no other SIR system malfunctions exist.
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