Before you take off or replace the steering wheel on your 1989-1992 Nissan 240SX, turn your wheels to face straight ahead and tilt the steering wheel sideways to be equal on both sides. Disconnect the battery ground cable. Step back and remove screws from the rear of the wheel. Unbolt the horn pad while moving the wire beyond reach, if needed. The method for removing and putting back on each horn button varies. Some you pop off, others you press up then remove, while others have a push in, turn clockwise way to remove them. When you have trouble taking off the horn pad, adjust the fixing screw behind the steering wheel before continuing. It's better to remove the horn switching block when necessary, but only if it gets in the way while you're taking out the wheels. Make sure to note where you put each piece. Use the pliers to connect two marks on the steering shaft right above the nylon nut and the wheel connecter. Take off the nut, then remove the steering wheel with a puller tool that won't chip the column shaft. Put the steering wheel back in place, following the same steps, and line up the punch marks. Also grease the turn signal cancel and horn ring. Be careful not to drive or hammer the wheel when putting it in place to keep the supporting column safe. Last, tighten the steering wheel nut to its prescribed torque and put on the horn button parts, before making sure everything works correctly, with the recommended steering wheel nut torque of 22-29 foot-pounds.