RAM 2500 Truck 2WD L6-6.7L DSL Turbo (2010)
Steering Mounted Controls Communication Module: Description and Operation
Steering Column Module - Description
DESCRIPTION
This vehicle is equipped with a Steering Control Module (SCM) that is internal to the multi-function switch housing. The multi-function switch is located
on the left side of the steering column, just below the steering wheel. This switch is the primary control for the front wiper and washer system, and also is
the driver control for the turn signals and the headlamp beam selection. The only visible components of the switch are the control stalk (1), control knob
and control sleeve that extend through the steering column shrouds on the left side of the column. The remainder of the switch, including its mounting
provisions and electrical connections, is concealed beneath the shrouds.
The switch housing and controls are constructed of molded black plastic. A single latch feature and key features integral to the multi-function switch
housing are used to secure the switch to the mounting bracket integral to the clockspring (3). Each of the switches within the multi-function switch is
internally connected to the SCM. A single connector receptacle integral to the back of the switch housing connects the SCM to the vehicle electrical
system through a dedicated takeout and connector of the instrument panel wire harness. The SCM within the multi-function switch is a Local Interface
Network (LIN) slave and communicates over a dedicated LIN bus circuit with the ElectroMechanical Instrument Cluster (EMIC) (also known as the Cab
Compartment Node/CCN), which is the LIN master.
The SCM cannot be adjusted or repaired, and is not flash update capable. If ineffective or damaged the entire multi-function switch must be replaced.
See: Lighting and Horns/Sensors and Switches - Lighting and Horns/Combination Switch/Service and Repair/Multifunction Switch - Removal.
