START-STOP button and fixture for remote key

The START-STOP button and the remote key together start the vehicle. The remote key contains an authorization code for the corresponding vehicle.

Fig 1: Inserting Remote Key

Courtesy of BMW OF NORTH AMERICA, INC.

After inserting the remote key in the fixture, the transponder authorization is read out. When the CAS detects an authorized remote control, terminal R is switched on. At the same time, the remote control is locked in the holder. The interlock is locked by a solenoid switch. The locked remote key is a prerequisite for the terminals to be switched (terminal R, terminal 15 with engine ON/OFF). An interlock prevents the remote key from being pulled out under the following preconditions:

• Engine running
• Speed signal greater than 0 km/h
• Selector lever not in "P" (park) for automatic vehicles

Pressing the START-STOP button initializes the engine start. In the process, the CAS control unit checks the following prerequisites:

• With automatic transmission, selector lever position "P" or "N" and brake control
• With manual gearbox, clutch control

Once all prerequisites have been met, the engine is started by the CAS control unit (terminal 50 activation). The engine is stopped by pressing the START-STOP button once again. The engine is stopped, terminal R stays switched on (for a long press, terminal 30). On vehicles with automatic gearboxes, the engine can only be stopped with the vehicle at a standstill when the parking lock is engaged. This fully electronic access to the vehicle has the following advantages:

• increased reliability of the terminal signals from wear-free sensor system
• defined switching characteristics of terminal outputs
• electronic access option to vehicle e.g. for auxiliary heater and Telestart (remote engine start)

For safety reasons, the engine can be stopped while driving by pressing the START-STOP button. A renewed start in this case is possible without additional brake control or clutch control.

For Comfort Access (CA), the remote key must not be in the fixture when starting the engine.