Antilock Brakes - Service Manual Update
File In Section: 5 - BrakesBulletin No.: 56-50-09
Date: December, 1996
SERVICE MANUAL UPDATE
Subject:
Section 5E1B - VCM (LB4) Four Wheel Antilock Brake System
Models:
1994-95 Chevrolet and GMC S/T Models
This bulletin revises pages 38-39, 42-43, 46-47, 50-51, 54-55, 56-59, and 66-67 in Section 5E1B of the 1994-95 S/T Service Manuals.
Multiple diagnostic trouble codes may set if a short to battery in the ABS Pulse Width Modulator circuitry occurs.
Current diagnostics instruct the technician to erroneously replace the Vehicle Control Module (VCM).
On LB4 equipped vehicles, a new part number is being released for the Vehicle Control Module. The new part number 16230703 will directly replace the existing 16184738 part number.
Prior to replacing the Vehicle Control Module, use the diagnostic charts which have been revised to aid in correctly diagnosing the problem.
Parts Information
Parts are currently available from GMSPO.