Steering Mounted Controls Assembly: Description and Operation

Multifunction Steering Wheel

Buttons are integrated in the steering wheel for easier operation of Infotainment, telephone and the navigation system. On vehicles with Tiptronic, rocker switches are also installed on the left and right.

The Multifunction Steering Wheel Control Module (J453) (under right button) reads out the button information and transmits it to the Steering Column Electronic Systems Control Module (J527) via the LIN bus (single wire Bus). From the Steering Column Electronic Systems Control Module, the information is transferred to the individual components via the CAN bus (comfort) and the Data Bus On Board Diagnostic Interface (J533).

Fault finding is performed via "Guided Fault Finding" using Vehicle Diagnosis, Testing and Information System (VAS5051B).