GMC 22510143 Lever Assembly, Direct Sign & Headlamp Dimmer Switch

Disconnect the negative battery cable and remove the steering wheel, then take off the steering column trim cover at the base of the dashboard. For late models, pry out the plastic cover plate at the end of the steering column using a screwdriver in the provided slots. Remove the lock plate from the steering column, which is secured by a snap ring in a groove on the steering shaft; depress the lock plate to relieve pressure on the snap ring and use a special U-shaped tool to assist in its removal. Slide off the cancelling cam, upper bearing preload spring, and thrust washer from the end of the shaft. Remove the turn signal lever attaching screw and take out the turn signal lever from the side of the column. Push in on the hazard warning knob and unscrew it from the threaded shaft, then remove the three mounting screws for the turn signal assembly. Pull the switch wiring connector out of the bracket on the steering column jacket, tape the connector terminals to prevent damage, and feed the wiring connector up through the column support bracket to pull the switch wiring harness and connectors out the top of the steering column. For installation, reverse the removal steps, ensuring the wiring harness is in the protector as it is positioned. Before placing the thrust washer, upper bearing preload spring, and cancelling cam, confirm that the switch is in the neutral position and the warning knob is pulled out, and always use a new snap ring on the shaft for the lock plate.