Or you could pull each wheel, disconnect the bearing harness, hook up a continuity tester to the two leads and spin the bearing. If the meter changes its reading, then that bearing is good. If it stays at 0, then the wire internally is broken, causing an open circuit, therefore causiung the ABSbrake light to illuminate. Get discount prices, fast shipping and ultimate product help when shopping for 2003 GMC Envoy SLT Parts at 4 Wheel Parts. The best online destination and local store solution for all of your Truck and Jeep off-roading needs. Locate the ABS wheel sensor. Remove the bolts that attach it to the rest of the suspension. You may also need to remove a few bolts that attach the wiring to the car's frame or suspension, to pull the sensor away from the vehicle for cleaning. Follow the line andor wiring harness to see if there are more bolts.