Commander 4WD V6-3.7L VIN K (2007)
Steering Column Lock: Description and Operation
Description
DESCRIPTION
A shaft lock module (1) is part of the premium version of the Sentry Key Immobilizer System (SKIS) in the Vehicle Theft Security System (VTSS). The
premium version of the SKIS is only available in vehicles built for certain markets, where the additional features offered by this system are required. The
shaft lock module is located in a bracket integral to the lower end of the steering column housing casting below the instrument panel in the passenger
compartment. This unit is designed to work in conjunction with the Sentry Key REmote Entry Module (SKREEM) (also known as the Wireless Control
Module/WCM) to control a locking bolt (2) that engages a machined slot in the steering shaft to prevent shaft rotation whenever there is not a valid key
present in the ignition lock cylinder on the instrument panel.
The die cast aluminum shaft lock module housing has a series of integral engagement tabs and slide tabs that engage matching slots and channels integral
to the mounting bracket on the steering column. When the module is fully engaged in the mounting bracket, two spring clips (3) on the module engage
the bracket, locking the module securely into place. Concealed within the module is the electronic circuitry of the module, and a bi-directional electric
motor that actuates the locking bolt. The module is connected through an integral connector receptacle (4) to the vehicle electrical system through a take
out and connector of the instrument panel wire harness.
The mounting provisions for the shaft lock module are designed to resist unauthorized tampering. The module cannot be removed from the steering
column while the locking bolt is in the locked position, or while the steering column is installed in the vehicle.
The shaft lock module unit cannot be adjusted or repaired and, if ineffective or damaged, it must be replaced.
