Issuing Start Enable

Authorization to start the engine is only given when there is an ID transmitter in the vehicle. Once the last door is closed, the Car Access System begins its search for a valid ID transmitter.

The Car Access System 4 requests a signal to be sent out to identify a valid ID transmitter. The interior antennas are used for this.

The ID transmitter responds using a high-frequency range (315 MHz). If the ID transmitter is authenticated, the Car Access System 4 grants permission for the engine to be started.

The search for an ID transmitter in the passenger compartment can also be triggered by pressing the START-STOP button. This will take place if the START-STOP button is pressed before the last door is closed, for instance.

Or if the vehicle is stationary too long and therefore loses communication with the ID transmitter. Pressing the START-STOP button triggers the search for the ID transmitter in the vehicle interior.