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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 819 (Theft Deterrent System) >> Diagnostic Information and Procedures >> DTC B3031: BCM Does Not See A Valid Passlock™ Sensor Code >> Test Description

Test Description

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The number below refers to the step number on the diagnostic table.

  1. 3. Tests for the proper operation of the 12-volt reference Security Sensor Power circuit, sensor ground circuit, and Passlock™ sensor signal (data) circuit. Troubleshoot the appropriate DTC prior to diagnosing DTC B3031.
Fig 1: Diagnostic System Check - DTC B3031
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