System Components

System Components
The H-SMG system is made up of the following components:
^ SMG gearshift lever
^ SMG steering wheel with shift paddles
^ Sport button (Dynamic Driving Control)
^ SMG hydraulic system
^ SMG Control Module
^ Reverse light relay
^ Transmission
^ Displays/indications in Instrument Cluster

SMG Gearshift Lever
The design of the lever and the shift gate is similar to the previously used SMG shift lever.
The shift gate depicted on the gearshift knob features the D symbol instead of the C symbol for cruise mode. The lever is connected to the transmission by electric leads only and the gearshift lever positions are monitored by 7 Hall sensors.

Operation
^ A downshift is performed when the lever is pressed forward.
^ An upshift is performed when the lever is pulled backward.
The gearshift lever position display (indicated with LEDs) is integrated in the gearshift lever center console trim, behind the gearshift lever.

SMG Steering Wheel with Shift Paddles


A gear change can also be performed using the shift paddles on the steering wheel.

Operation
^ An upshift is performed when either shift paddle is pulled backward
^ A downshift is performed when either shift paddle is pressed forward.

Sport Button





Pressing the Sport button (1) activates the Dynamic Driving Control function and selects sportier transmission performance (shorter gearshift times). This function can also be selected in cruise mode.
The request signal is monitored by the MS45 ECM which transmits the signal to the SMG and EPS Control Modules.
If there are no faults in the Control Modules, the EPS Control Module illuminates the function light in the Sport button.

SMG Hydraulic System
The clutching operation and the gear shift is performed automatically by the SMG hydraulic system. The H-SMG hydraulic system has similar components and functions as the previous SMG hydraulic system.

Installation location
In comparison with the previous SMG, the mounting positions of the hydraulic system components in the H-SMG have undergone significant changes, as can be seen in the following 5 illustrations:





Left Side View





Right Side View





Top Rear View





Bottom Rear View





Rear view





Compared with the previous SMG hydraulic system, the H-SMG hydraulic system is slightly modified in the following areas:
^ The electromechanical reverse light switch has been omitted.
^ The valve block is located underneath the transmission.
^ The expansion tank is located on the right side of the transmission with new min/max fill level markings.
^ The electroLydraulic pump is located on the right side of the transmission.
^ On the left side of the transmission, below the clutch actuator, is a central connector for the valve block (solenoid valves EV0 to EV3, pressure sensor, voltage and ground supply to the valves).
^ Flexible high pressure hydraulic lines with quick-connect couplings are used.

SMG Control Module





The SMG Control Module is located in the electronics box at the front left in the engine compartment. It is positioned next to the ECM, in place of the EGS Control Module.

Displays/Indications





The selected drive positions are displayed in 2 segments in the instrument cluster. The selected -tear position (1-6) is displayed in the right segment (2).
The drive mode is displayed in the left segment (1), D for automatic mode. No symbol appears in the left segment when the manual drive program is selected. Only the selected Gears are disPiaved in the right segment.
A fault can also be displayed in the left segment with F. A serious gearbox fault is indicated by an indicator light in the instrument cluster.