Combination Switch: Description and Operation

94 - Combined Steering Column Module / Multi-function Steering Wheel

The combined steering column module reads in the button and switch signals generated by module levers and outputs this on the Comfort CAN.

Lever Functions










Multi-function Steering Wheel (optional)







The multifunction steering wheel is based on the basic steering wheel and requires the PCM option. Unlike the basic steering wheel, however, it has four function buttons and two function rollers evenly divided between the left-hand and right-hand spokes.

These controls allow the driver to operate essential audio, telephone and navigation functions without having to take their hands off the wheel. This means less distraction and better concentration on what is happening on the road. The black function buttons are embedded in bezels painted with an Aluminium Look finish. This clearly emphasizes the controls, both visually and functionally. They are also ergonomically arranged to ensure the driver can easily operate them using their left or right thumb.

The steering wheel electronics system comprises two switch modules, a multi-function control unit, an airbag module and a horn contact. The signals from the Tiptronic rocker switches and the buttons are fed into the multi-function control unit in voltage encoded form. In the multifunction control unit the individual signals are combined into a protocol and relayed serially via single core cable, volute springs to the combined steering column module, where they are processed for CAN transmission.

Diagnosis

Diagnosis is carried out with the PIWIS Tester under menu option "Steering wheel electronics". Some functional features of the vehicle electrical system are restricted or disabled in production and transportation mode.







Positions of the Controls