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How do you change the ignition tumbler in a 1999 gmc suburban


Inspect/ReplaceTo remove the

Inspect/ReplaceTo remove the ignition lock:

CAUTION
You must remove the steering wheel when replacing the ignition lock. On vehicles with a Supplemental Inflatable Restraint (SIR) system, you must temporarily disable the SIR system and remove the inflator module when removing the steering wheel. Leaving the SIR system on could result in deployment of the air bag and possible personal injury.

•Disconnect the negative battery cable, and remove the steering wheel.
•Remove the bumper and the carrier snapring retainer from the steering shaft.
•Use a lock plate compressor screw tool to install the lock plate compressor screw in the upper steering shaft. To keep the shaft from telescoping, tighten it to 40 inch lbs.
•Using the lock plate compressor tool, install on the upper steering shaft, tighten it to depress the shaft lock. Remove the shaft lock retainer, the compressor tool and the steering shaft lock.
•Remove the turn signal canceling cam assembly. Put the turn signal switch in the "N" position and remove the upper bearing spring.
•Position the turn signal switch so the mounting screws can be removed through the holes in the switch and remove the turn signal lever.
•Remove the turn signal switch-to-steering column screws and lift the turn signal switch. Remove the wire protector and disconnect the turn signal switch connector.
•Use a terminal remover tool to disconnect the buzzer switch wires from the turn signal switch connector. Remove the buzzer switch assembly with needle-nose pliers.
•Place the lock cylinder in the ACC position, then remove the lock retaining screw and the lock cylinder set.
•To install the new cylinder lock, reverse the removal procedures.
•Tighten the lock retaining screw to 22 inch lbs., the turn signal switch screws to 59 inch lbs. and turn the turn signal lever screw to 53 inch lbs.
•As part of the final replacement procedures, check the operation of the switches and the steering column.

The steering wheel is splined to the steering column and held in place by a nut. Courtesy of General Motors Corporation - Service Operations.


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