GM ABS VI & ETS Component Description: EBCM/EBTCM, Wheel Speed Sensors (5E2-9)

This is page 5E2-9 from a GM factory service manual section covering the Antilock Brake System (ABS) and Enhanced Traction System (ETS), specifically the ABS VI system. The page describes major system components and their operation. It explains the Electronic Brake Control Module/Electronic Brake Traction Control Module (EBCM/EBTCM), including its inputs (four wheel speed sensors, brake switch, ignition switch, unswitched battery voltage), outputs (three bidirectional motor controls, four indicator controls, two solenoid controls, system enable relay), serial data communication via DLC terminal 9, its wheel lock-up prevention logic, and DTC storage in nonvolatile memory. A NOTICE states the PROM is not serviceable and the module must be replaced as an assembly. Sections describe front and rear wheel speed sensors (variable reluctance type, integrated with hub/bearing assemblies, not repairable or adjustable, requiring full assembly replacement on failure), the electronic brake control relay (normally-open with special contact material for high currents), the brake fluid level indicator sensor (cross-referenced to Section 5A), the wiring harness, and the wheel speed sensor jumper harnesses (twisted-pair, flexible, not repairable, an Important callout warns against soldering, splicing, or crimping). The page ends beginning a discussion of the amber ABS warning indicator behavior.