SL 65 AMG (230.479) V12-6.0L Turbo (275.981) (2005)
Steering Mounted Controls Assembly: Description and Operation
GF82.90-P-3001RK Scanning Of Switch Positions, Function
GF82.90-P-3001RK Scanning Of Switch Positions, Function
The button presses on the multifunction steering wheel (MFL) are read in voltage-coded by the steering column module (N80). Different resistors are
connected in series upstream and downstream of the individual buttons. Pressing the buttons relays different voltages to the steering column module
(N80). The steering column module (N80) interprets the button-related request from these voltages and can then generate and transmit an appropriate
Class B (interior) Controller Area Network Bus (CAN-B) message. The requests from the steering wheel gear shifter PLUS switch (S111/1) and the
steering wheel gear shifter MINUS switch (S110/1) are also read in voltage-coded.
The steering column module (N80) receives the requests from the steering wheel gear shifter PLUS switch (S111/1) and the steering wheel gear shifter
MINUS switch (S110/1) and relays them to the electronic selector lever module control unit (N15/5) via discrete cabling.
Priorities
If, within the left multifunction steering wheel button group (S110) or the right multifunction steering wheel button group (S111) several buttons are
pressed simultaneously, the instrument cluster (A1) will always only activate one function. As a result, the different functions have different priority
ranks.
Below, the buttons within the right multifunction steering wheel button group (S111) are listed in descending priority order:
^
Fanfare horn button (S111s5)
^
Steering wheel gear shifter PLUS (S111/1)
^
Accept/terminate phone call button (S111s3)
^
Buttons + and - for setting specific functions and volume control (S111s1)
Below, the buttons within the left multifunction steering wheel button group (S110) are listed in descending priority order:
^
Fanfare horn button (S110s5)
^
Steering wheel gear shifter MINUS (S110/1)
^
System select button (S110s3)
^
Scroll forward/back button (S110s1)