GF82.90-P-0001TB Multifunction Steering Wheel Function

GF82.90-P-0001TB Multifunction Steering Wheel Function

15.03.07 The document has been updated to this date and will no longer be subject to revision.

Component Identification:

Function conditions:
^ Circuit 15 ON
^ Circuit 15R ON

The multifunction steering wheel (MFL) serves to increase active driving safety in road traffic in combination with the instrument cluster (A1).
The driver can concentrate on the traffic without distraction when controlling and operating various vehicle components (e.g. radio, telephone). The multifunction steering wheel allows the driver to operate and interrogate the following systems:
^ Radio
^ COMAND
^ Navigation
^ Distronic
^ Trip computer
^ ASSYST
^ Telematics/E-Call (USA)
^ Telephone
^ Tire pressure monitor (TPM)
^ Steering wheel gear shift

The main system selected by the user is displayed in the multifunction display (A1p13) in the instrument cluster (A1). In addition, the fanfare horns (H2) can be actuated by means of the impact plate of the multifunction steering wheel.

The start screen for the selected level is always displayed when the display level is changed, not the last submenu selected in this display.

Task of left multifunction steering wheel button group (S110)
In system selection button (S110s3) and Scroll forward and backward buttons (S110s1) are included in the left multifunction steering wheel button group (S110).

Each of the systems can be called with the system selection button (S110s3). It is possible to "scroll" forward and backward in the systems. It is also possible to "scroll" forward and backward with the scroll forward and backward button (S110s1) within a system, i.e. additional submenus can be called up.

Task of right multifunction steering wheel button group (S111)
The right-hand button group for the multifunction steering wheel (S111) contains the button for accepting and terminating a telephone call (S111s3), and the + and - buttons, which are used to set specific functions and for the volume control (S111s1). A telephone call can be accepted or terminated with the accept/ terminate phone call button (S111s3).

The volume for the system currently active can be adjusted with the button + and -, setting of specific functions and volume control (S111s1). In addition, for example, in the "Settings" system, the OFF delay time of the interior light can be extended (+) or shortened (-) .

Transfer of signals
The control signals are transferred voltage-coded via the fanfare horns and airbag clock spring contact (A45) to the steering column module (N80).
From the steering column module (N80), the transfer takes place via the Controller Area Network bus class B (interior) (CAN-B).

Steering wheel gear shift
With program selection "M" (manual program), the individual gears of the transmission can be engaged directly via the steering wheel gear shifter MINUS (S110/1) or the steering wheel gear shifter PLUS (S111/1).

Transfer of shift signals
Each time the steering wheel gear shifter MINUS (S110/1) or steering wheel gear shifter PLUS (S111/1) is operated, the electronic selector lever module control unit (N15/5) receives an electrical signal. The signal is read in by the electronic selector lever module control unit (N15/5) and is placed on the Controller Area Network bus class C (engine compartment) (CAN-C). The ETC control unit (N15/3) triggers the gear change.

The steering wheel gear shifter MINUS (S110/1) and steering wheel gear shifter PLUS (S111/1) are not capable of diagnosis.