Mechanics

HOW DO I REPAIR AN IGNITION LOCK

1993 GMC Suburban • 143,000 miles

When I put the truck into park, I cannot turn the key to shut off the engine, and take the key out. I can only turn the ignition forward to start the truck. What should I be checking, and how do I do it. Is this a repair that is done easily? How costly is it to take it to a shop and have them fix it?
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David.roynelle.keola
February 8, 2012.



STEERING COLUMN SWITCHES -1993 GMC Suburban C1500
Page 1 of 1
TURN SIGNAL SWITCH & LOCK CYLINDER

Removal

1.
Disconnect battery negative cable. Remove steering wheel. See STEERING WHEEL & HORN PAD under REMOVAL & INSTALLATION. Remove shaft lock cover. Using Lock Plate
Compressor (J-23653-C), compress lock plate and pry retaining ring from groove in steering shaft. See Fig. 3. Discard retaining ring. Remove lock plate. Remove turn signal canceling cam.
Remove upper bearing spring. Remove thrust washer. Place turn signal lever in up (right turn) position. Remove turn signal/combination switch lever and hazard switch lever. Remove switch
actuator arm screw and remove switch actuator arm. Remove 3 turn signal switch retaining screws. Remove steering column support bracket bolts and support bracket.
Disconnect turn signal switch electrical connector. Remove 2 wiring protectors and carefully pull wiring through steering column. Remove turn signal switch and allow to hang free.
Remove buzzer switch. Place key in lock cylinder and turn to LOCK position. Remove lock retaining screw, being careful not to drop screw down column. See Fig. 4. Pull lock cylinder from
housing.
2.
3.
4.
Installation

1.
To install, reverse removal procedure. Install turn signal switch electrical connector through housing. Install 2 wiring protectors. Install steering column support bracket and support bracket
bolts.
To complete installation, reverse remaining removal procedure. Lubricate turn signal canceling cam with synthetic grease before installation. Using Lock Plate Compressor (J-23653-C), install
NEW shaft lock retaining ring. See Fig. 3. Ensure retaining ring is fully seated in groove on steering shaft.
Carefully pull down on turn signal electrical wiring to remove any possible kinks within steering column. Tighten bolts and screws to specifications. See TORQUE SPECIFICATIONS TABLE at
the end of this article.
2.
3.
Fig. 3: Removing Shaft Lock Plate & Retaining Ring Courtesy of GENERAL MOTORS CORP.
Fig. 4: Removing Lock Cylinder Assembly Courtesy of GENERAL MOTORS CORP.

2/7/2012


Rivermikerat
Feb 8, 2012.


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