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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1659 (Theft Deterrent System) >> Diagnostic Information and Procedures >> DTC B2955: Passlock Code >> Test Description

Test Description

WARNING: This page is about a different car, the 2002 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table.

  1. 2. Verifies that DTC B2955 is current.
  2. 3. Tests for proper operation of the circuit in the high voltage range.
  3. 6. Test for any device that may prevent proper Passlock system operation.
  4. 7. Tests for a voltage drift within the Passlock sensor.
  5. 8. Verifies correct signal circuit voltage to Passlock sensor.
  6. 9. Test for proper operation of the circuit in the low voltage range.
  7. 10. Tests for high resistance or an open in the 12v reference circuit.
  8. 12. Tests for a short to ground in the Passlock signal circuit.
    Fig 1: DTC B2955 (1 Of 2)
    G01718149Courtesy of GENERAL MOTORS CORP.
    Fig 2: DTC B2955 (2 Of 2)
    G01718150Courtesy of GENERAL MOTORS CORP.
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