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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1179 (Steering Wheel And Steering Column) >> Diagnostic Information and Procedures >> DTC B2587: BCM Internal Malfunction Or An Open Or A Short To Ground In Column Lock Drive A Circuit >> Test Description

Test Description

WARNING: This page is about a different car, the 2003 Chevrolet Corvette. 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. Tests for an open in the BCM2 fuse. BCM2 fuse supplies power to the BCM to operate the steering column lock motor.
  2. 3. Tests for an open in the BCM battery positive voltage circuit at the BCM.
  3. 4. Tests for an open or short to ground in the BCM battery positive voltage circuit between the steering column lock relay and the I/P fuse block.
  4. 5. Tests for an open or short to ground in the steering column lock or unlock circuit. If steering column lock or unlock circuit is shorted to ground the BCM2 fuse will open.
  5. 6. When the BCM is replaced, use a scan tool to perform the BCM RPO Reprogram procedure.
Fig 1: Diagnostic System Check - DTC B2587
G01419123Courtesy of GENERAL MOTORS CORP.
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