Engine start

To start the engine, the gear lever and transmission must both be in "N" (neutral).

When the engine is started, sufficient system pressure must immediately be built up to open the clutch. For this reason, the SMG control unit is activated by a wake-up signal from the car access system (CAS) when the vehicle is unlocked. The SMG control unit measures the system pressure via the hydraulic pressure sensor. If the system pressure is too low, the hydraulic pump will be actuated. The hydraulic pump will build up pressure. When the system pressure has been reached, the SMG control unit will switch the hydraulic pump off again.

With the "prompt signal", the gear lever position indicator in the center console is activated. If terminal 15 (wake-up wire) has not been activated approx. 15 minutes after the vehicle was unlocked, the gear lever position display will be switched off again.