Convenient-start system

The convenient-start system allows the engine to be started in a user-friendly manner as the starter motor automatically remains engaged until the engine is running.

When the START-STOP button is pressed, the CAS control unit first activates terminal 15. The relief relay for the ignition coils is activated.

When the START-STOP button is pressed, the CAS control unit checks that the brake pedal is depressed and the selector lever is in P or N.

The engine start process runs as follows:

• First, the EWS is checked via the EWS data wire.
• If the data is correct, the DME enables the ignition and the fuel injection.
• The CAS control unit switches battery voltage to the DME control unit via terminal 50E. This gives the signal for the required engine start.
• The CAS control unit switches battery voltage to the starter motor via terminal 50L. The starter motor is switched on by the DME via the starter inhibitor relay.
  • E65, E66 and E70

  The DME switches the starter motor on.

• The starter motor continues to turn until the CAS control unit receives the "engine running" signal from the DME through the data bus. The terminals 50 are then switched off by the CAS control unit.

  If the engine does not start, the terminals 50L and 50E will be switched off after a maximum of 20 seconds. The engine start is thus aborted.