PT Cruiser L4-2.4L Turbo (2009)
Steering Mounted Controls Communication Module: Description and Operation
Steering Column Control Module - Description
DESCRIPTION
This vehicle is equipped with a Steering Column Control Module (SCCM) that houses a clockspring (2), the left multi-function switch (1), and the right
multi-function switch (3). The SCCM is secured near the top of the steering column below the steering wheel and is completely concealed beneath the
steering column shrouds. The SCCM is installed as a modular unit that supports the left (lighting) multi-function switch (1) and the right (wiper)
multi-function switch (3). The controls for each of these switches extend through appropriate clearance holes provided in the steering column shrouds.
The SCCM utilizes integrated circuitry and information carried on the Controller Area Network (CAN) data bus along with several hard wired analog
and multiplexed inputs to monitor both the right and left multi-function switches, the ignition switch, the horn switch, and the speed control switches. In
response to those inputs, the SCCM controls and integrate many electronic functions and features of the vehicle through both hard wired outputs and the
transmission of electronic message outputs to other electronic modules in the vehicle over the CAN data bus. See: Powertrain Management/Computers
and Control Systems/Information Bus/Description and Operation/Communication - Description.
The clockspring is contained within a flat, round molded plastic case (1). The back (instrument panel side) of the case has an integral mounting bracket
that is secured to the stationary steering column housing with three screws.
The electronics for the lighting functions and the wiper functions are located in the left lighting stalk, or left multi-function switch. There is a jumper
wire from the wiper stalk that connects to the lighting stalk. The messages are than sent over the LIN bus to the Cab Compartment Node (CCN) and the
CCN then transfers the message to the TIPM on the CAN bus.
A service replacement SCCM is shipped with the clockspring pre-centered and with a molded plastic locking pin installed. The locking pin secures the
centered clockspring rotor to the SCCM case during shipment and handling, but must be removed after the SCCM is installed on the steering column and
the steering wheel is installed. See: Restraint Systems/Air Bag Systems/Clockspring Assembly / Spiral Cable/Service and Repair.
If faulty or damaged, each component of the SCCM can be replaced individually, including the clockspring, and the left and right multi-function
switches.