Contents Section: Steering Column Switches All sections

Ignition Switch & Lock Cylinder GMC Cab & Chassis R3500

Steering Column Switches 2 illustrations ~535 words

DESCRIPTION

The ignition lock cylinder is typically mounted below turn signal switch and is actuated by ignition key. The ignition switch is typically mounted at base of steering column, inside channel section of brake pedal support.

The ignition switch is actuated by a rod and rack assembly. A portion of rack is toothed and engages a gear on end of lock cylinder. This enables the rod and rack to be moved axially, with respect to column, to actuate ignition switch when lock cylinder is rotated.

STEERING WHEEL

Removal & Installation

Disconnect negative battery cable. Remove horn button cap. Remove retainer and steering wheel nut. Disconnect horn lead (if equipped). Mark relationship of steering wheel to shaft. Use Steering Wheel Puller (J-1859-03) to remove steering wheel. To install, reverse removal procedure.

TURN SIGNAL SWITCH

Removal

1) Remove steering wheel. Remove instrument panel trim cover. Position screwdriver blade into steering shaft lock plate cover slot. Pry up and out to free cover from lock plate.

2) Screw center post of Lock Plate Compressor (J-23653-A or J-23653-B) onto steering shaft as far as it will go. Compress lock plate by turning center post nut clockwise. Pry retaining ring out of steering shaft. Remove compressor and lock plate.

3) Remove turn signal lever screw and lever. Remove hazard warning knob. Press knob inward and then unscrew. Remove turn signal switch mounting screws. Position turn signal switch and shifter housing in low gear position. Remove wiring harness cover by carefully pulling downward on tab provided.

4) Pull switch connector out of bracket and feed connector through column support bracket. Pull turn signal switch straight up, guiding the wiring harness and cover through column housing.

Installation

To install, reverse removal procedure. On non-tilt steering columns, ensure wiring harness is on protector. Feed connector and cover down through housing and under mounting screw. On tilt columns, feed connector down through housing and under mounting bracket. Install cover on harness.

Removal

Turn ignition key to "RUN" position. Remove steering wheel and turn signal switch. It is not necessary to completely remove switch from column. Pull switch out far enough to slip it over end of shaft. DO NOT pull harness out of column. Carefully remove retaining screw and lock cylinder.

Installation

Turn ignition key clockwise against stop while holding lock cylinder. (Scheme 1) Align lock cylinder with keyway in housing. Push lock cylinder in and install retaining screw. To complete installation, reverse removal procedure.

Scheme 1

Scheme 1: LOCK CYLINDER

Note. "P" series ignition switch removal and installation procedures not available from manufacturer.

Removal

1) Lower steering column and support column to avoid causing damage. Place ignition switch in "LOCK" position (one detent down from full up position). (Scheme 2) Remove 2 screws and switch assembly from vehicle.

2) If lock cylinder was removed, the actuating rod should be pull up until there is a definite stop, then move rod down one detent (into "LOCK" position). Remove 2 screws and switch assembly from vehicle.

Installation

Place lock and switch in "LOCK" position (one detent down from full up position). Insert actuating rod into switch and install switch using mounting screws. To complete installation, reverse removal procedure.

Scheme 2

Scheme 2: IGNITION SWITCH

TORQUE SPECIFICATIONS

ApplicationFt. Lbs. (N.m)
Steering Column Support Bracket Screws22 (30)
Steering Wheel Nut30 (40)
INCH Lbs. (N.m)
Ignition Switch Screws35 (4.0)
Lock Cylinder Retaining Screw40 (4.5)
Turn Signal Switch Screws35 (4.0)

TORQUE SPECIFICATIONS