The 1998 Chevrolet K1500 has an airbag, and when removing the ignition lock cylinder, you must follow the precautions so that the airbag does not inflate and cause injury to you. The lock cylinder can be replaced by itself-you do not have to replace the ignition switch when replacing the lock cylinder. If the key is coded, you will need to take the key and lock cylinder to the dealership to have it programmed for the vehicle.
You will need these tools to complete this job:
Set of wrenches
Set of sockets
Special tool J 23653-SIR
Liquid eraser or white paint
Eighth-inch burring tool
Disconnect the battery negative cable and lay it aside, ensuring that it does not touch metal. Wait for at least five minutes before proceeding, so that any residual power to the air bag system is released. Turn the steering wheel 90 degrees, so you can access the rear shroud holes for the inflator module. Insert a screwdriver into the holes. Push on the leaf spring to release the pin. Turn the steering wheel 180 degrees so you can access the rest of the shroud holes. Release the remaining pins with the screwdriver.
Tilt the inflator module toward the rear, from the top, across the wiring. Unplug the lead wire from the clip on the module and mark it with the masking tape and module. Unplug the lead wire from the clip on the steering wheel, then unplug the connector position assurance (CPA) and its retainer from the module.
Remove the upper and lower steering wheel shroud and the air bag module with the appropriate sockets. Lower the steering column by loosening the four bolts under the steering column and allowing the column to rest on the seat.
Remove the retaining ring, SIR coil assembly and wave washer using the screwdriver. Remove the lock shaft retaining ring using special tool J 23653-SIR and pushing down on the shaft lock shield assembly. Discard the ring. Remove the shaft lock shield from the steering column. Unbolt and remove the turn signal cancel cam assembly from the steering column, using the appropriate socket.
Remove the park-lock cable assembly from the lock module assembly. If you have a key alarm switch, remove that by prying its retaining clip with a small screwdriver and rotating it one-quarter turn.
Remove the two tapping screws using a screwdriver. Remove the ignition key and alarm assembly, but do not unplug the switch-let it hang freely. Hold the lock module assembly, then remove the three pan-head tapping screws for the lock module assembly. Keep slight pressure on the assembly, as it has some spring tension. Remove it from the vehicle. Unbolt and remove the backing plate from the module.
Mark the two sector gears, using the liquid eraser or white paint, at the “Off-Lock” position. Remove the sector gears with the appropriate socket. Remove the positioning tab that is located on the end of the lock cylinder, using an eighth-inch burring tool. Remove all the metal burrs from the lock module and the cylinder assembly. Push on the locking tab located on the inside of the lock module assembly while pulling the lock cylinder off the steering column.
Line up the marks on the sector gears. Install the gears and the backing plate onto the lock module assembly. Install the new lock cylinder set. Check to make sure that the assembly is in the “Off-Lock” position. Insert the key into the lock cylinder and turn it to the “Off-Lock” position if it’s not already there.
Line up the locking tab with the slots on the lock module assembly. Push the cylinder into position. Turn the lock cylinder to the “Acc” position and make sure the alignment arrows on the sector gears are pointing toward each other. Turn the lock cylinder to the “Lock” position and push the lock bolt in until it is flush. Line up the lock module assembly with the head assembly, then install the lock module assembly.
Screw in the three pan head screws and tighten them to 53 inch-pounds of torque. Reinstall the ignition and key alarm switch assembly and their fasteners. Tighten the fasteners to 12 inch-pounds of torque. Install the key alarm switch, making sure the retaining clip is parallel to the lock cylinder. Rotate the alarm switch one-quarter turn until you feel it lock in place.
Lubricate the lower brass surface of the lower turn signal cancel cam assembly with a bit of synthetic grease. Reinstall the assembly. Line up the inner block tooth on the lock plate to the block tooth on the race and upper shaft assembly. Install the assembly and tighten the bolts. Install a new shaft long ring, using special tool J 23653-SIR. Make sure the ring is seated in the groove located on the shaft.
Reinstall the center race and the upper shaft assembly. Place the ignition switch on the lock assembly, making sure that the coil is centered. Reinstall the washer and SIR coil assembly. Reinstall the retaining ring. Route the coil wire along the steering column.
Reinstall the wiring harness straps on the steering column harness. Reinstall the park lock cable assembly, making sure the transmission is in “Park,” then install the ignition switch, making sure it is in the “Off-lock” position. Reinstall the upper and lower covers and the lock cylinder set. Lift the steering column and tighten reinstall the four steering column bolts. Tighten the bolts firmly. Plug in the CPA and its retainer. Reattach the lead wires for the steering wheel and the module. Refit the inflator module on the steering wheel and slide it into place, making sure the pins snap into place. Reconnect the negative battery cable.