GM Service Manual Online
For 1990-2009 cars only

When the Electronic Brake Traction Control Module (EBTCM) commands the electronic brake control relay ON, B+ is supplied through the EBTCM connector C1 terminal B8 to the MAGNASTEER actuator connector terminal A. Ground/control for the MAGNASTEER actuator is provided through the EBTCM connector C1 terminal B7 to MAGNASTEER actuator connector terminal B. The EBTCM controls the amount of current supplied to the MAGNASTEER actuator based on the input from the wheel speed sensors.