GMC 19245374 Switch Asm,Headlamp

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In 1988 through 1994 models, start by disconnecting the negative battery cable, and for models with a Delco Loc II anti-theft audio system, ensure the lockout feature is off. Remove the instrument cluster trim panel retaining screws, disconnect electrical connectors behind the light switch, and remove the panel. Take out the light switch retaining screws and lift the switch from the trim panel. To reinstall, ensure the grounding ring is in place. For the headlight dimmer switch, remove the steering column support bracket bolts and nuts, lower the steering column, disconnect the dimmer switch electrical connector, and remove the retaining bolts. In the case of the park/neutral switch/back-up light switch for automatic transmission. For the windshield wiper/washer switch, remove the steering wheel, compress the locking plate, remove the clip retaining it to the steering column, and proceed with the disassembly steps. Disconnect the handle from the windshield wiper switch and drive the pin through the switch housing to remove it. Reinstallation is the reverse of removal. For the ignition switch, disconnect the negative battery cable, place the ignition switch in the Lock position, and lower the steering column. Remove the ignition switch retaining screws, lift the switch out, and reconnect the actuating rod before reinstalling it. To remove the Turn Signal Switch and key lock cylinder. In 1995 and later models, start by removing the steering wheel and the steering column cover. Remove the Torx-head bolt, unplug the electrical connector, and lift off the Turn Signal Switch. Installation is the reverse of removal. If needed, center the airbag coil by removing it, turning it over, depressing the spring lock, rotating the hub as instructed, and releasing the spring lock. Finally, install the wave washer and the airbag coil, ensuring the lower wiring harness is taut to prevent damage when turning the steering wheel.

The process for removing and installing steering column switches (turn signal and key lock cylinder) on 1988 through 1994 models should be included in your question as it is not present in the provided text.