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You have to remove the steering wheel, and it requires special tools.
Remove the ignition cylinder retaining ring. Poll the ignition cylinder out. Remove the wiring harness from the back of the ignition cylinder.
do I remove steering wheel to change out ignition
How do you remove steering pump on a 2002 Buick rendezvous 3.4L?
The complete instructions are in Haynes manual #38025 (1420). You actually have to remove the steering wheel first. Amazon should have this cheap.
remove the steering wheel with special tools and then the turn signal arm and switch assembly plate to expose the ignition switch lock bolt use some fingernail polish to mark the positions of anything you remove.
how to remove power steering pump
I believe that the switch is located in the ignition cylinder (which you can get from any auto parts store). Unfortunately you'll need a steering wheel puller and a tilt removal mechanism before you can start with that.
It is not possible to remove the power steering pulley on a 1997 Buick Le Sabre without removing the power steering pump.
The ignition switch. Where the key goes in is the key tumbler.
remove the upper and lower covers on the steering column. ignition switch has a couple of bolts holding it on the left side. may require a female torx socket to remove. Has large wiring harness that plugs to bulkhead connector underneath dash.
Disconnect the battery. Remove the ignition coils. Remove the ignition control module that was under the coils, and replace it.