Automatic transmission (AT), transmission modes - GF27.10-P-0001-06AHX

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TRANSMISSION 722.930 up to 5/31/11, 722.931 as of 6/1/11 in MODEL 212.0/2

Fig 1: Display - Transmission Mode Screen

Courtesy of MERCEDES-BENZ USA

Gear indicator in instrument cluster (A1) in transmission mode Sport "S", Sport PLUS "S+" and transmission mode Comfort "C"

It shows the driver the currently selected shift range "1", "2", "3", "4", "5", "6" or the selector lever position "P", "R", "N", "D".

In addition to the gear indicator, the current selector lever position is highlighted with a white background bottom left next to the transmission mode display.

Gear indicator in instrument cluster in transmission mode Manual "M"

It shows the driver the engaged gear "1", "2", "3", "4", "5", "6", "7" or selector lever position "P", "R", "N".

Transmission mode display in instrument cluster

It shows the driver the program selection (S192) Comfort "C", Sport "S", Sport PLUS "S+" or Manual "M" performed at the transmission mode rotary switch.

The individual vehicle tuning (chassis setting and selected transmission mode) stored via the AMG button (S193/3) is shown in the multifunction display after the AMG button has been pressed, and can be changed through the multifunction steering wheel (MFL).

As of model refinement 13, a gearshift recommendation is also shown in the instrument cluster. This is part of the short-term M mode that is also integrated.

The gear limitation is replaced by the function "Short-term M mode". Short-term mode M is a temporary program that is activated when the steering wheel gearshift buttons or the DIRECT SELECT INTERFACE (N150) are operated. Pressing in the positive (+) direction triggers an upshift and pressing in the negative (-) direction triggers a downshift, insofar as this is permissible. If not, the current gear is maintained. After a specified time window, this function deactivates again automatically. The activated time can be extended by a minimum speed being dropped below (e.g. stopping), where lateral acceleration is detected by the yaw rate sensor for lateral and longitudinal acceleration (B24/15) or if the vehicle is in a deceleration phase. If none of the stated criteria are active anymore, the M mode remains active for a prescribed remaining time. After this remaining time expires, the initial shift mode is returned to.

The driver can prematurely cancel the short-term mode M through specific actions, e.g. if he/she operates and holds the upshift steering wheel gearshift button (S111/1) or the DIRECT SELECT INTERFACE in the "positive" (+) direction, changes the gear range or changes the transmission mode. If one of these preconditions is met, a switch is made back to the initial shift program.

View of center console, shown as of model year 2012/YoM 11

Fig 2: Center Console - Shown On Model 212

Courtesy of MERCEDES-BENZ USA

The following selector lever positions are detected via the DIRECT

SELECT INTERFACE:

"R", reverse gear
"N", neutral and start position (no power transmission, vehicle can move freely)
"D", all 7 forward gears are available

In order to change from one selector lever position to the next, greater pressure must be applied to the selector lever (higher force application necessary).

Pressing the "P" button at a vehicle speed < 8 km/h activates the parking lock.

Transmission mode rotary switch

The following transmission modes can be selected via the transmission mode rotary switch:

Transmission mode Comfort "C", start-off in 2nd gear except in 1st gear range; gear changes are performed at lower engine speeds
Transmission mode Sport "S", start-off in 1st gear for all driving situations; gear changes are performed at a higher engine speed
Transmission mode Sport PLUS "S+"; gear changes are performed with shorter shift times
Transmission mode Manual "M"; direct gear selection using upshift steering wheel gearshift button (S111/1) and downshift steering wheel gearshift button (S110/1)
Transmission mode Race Start "RS", offers optimum vehicle acceleration from a standing start, provided that road surface provides good grip. This mode is activated in the Electronic Stability Program (ESP) Sport mode with the selector lever set to "D". The Race Start transmission mode ends when a vehicle speed of 50 km/h is exceeded. Transmission mode "S+" is then activated and ESP Sport remains engaged.

Customer action	Operating safety	System protection
AMG ESP Sport Off button pressed	Driver door closed	No limp-home mode for following systems: ME-SFI [ME] (motor electronics) gasoline injection and ignition system Adaptive Brake (ABR) Fully integrated transmission control (VGS)
Brake operated or brake pressure > limit value	No trailer	No cold start Engine temperature > limit value
Transmission mode rotary switch is set to Race Start "RS" and confirmed with upshift steering wheel gearshift button	Steering not turned Steering angle < limit value	Wet clutch not overloaded Steel disk temperature < limit value
Accelerator not operated
Vehicle at rest
1st gear engaged
Parking brake not operated
AMG ESP Sport Off button not pressed, after vehicle speed v > 0 km/h	Steering not turned Steering angle > limit value, not after vehicle speed v > 0 km/h	No limp-home mode for following systems: ME ABR VGS
Brake not applied or brake pressure < limit value, not after vehicle speed v > 0 km/h or transmission mode Race Start "RS" active	Driver door, trunk lid or engine hood open
1st gear not engaged, not after vehicle speed v > 0 km/h
Canceled with downshift steering wheel gearshift button

AMG button for vehicles up to facelift 13

The AMG button is used to store and call up an individual vehicle tuning setting.

The vehicle tuning features the following setting possibilities:

The selected suspension tuning (Comfort/Sport)
The selected transmission mode ("C", "S", "S" and "M")

The task of the transmission mode control unit is to read in the AMG button, to process the signals digitally and to transmit them to the instrument cluster via the chassis CAN in the form of a status message. The status of the AMG ESP Sport Off button remains unchanged and it is not stored.

For vehicles as of facelift 13 the current chassis CAN will be replaced by the chassis CAN 1 (CAN E1). A second chassis CAN 2 (CAN E2) is networked between the instrument cluster and the front SAM control unit with fuse and relay module (N10/1).