System Inputs: EWS

The EMS2000 communicates with the EWS system to provide immobilization of the vehicle. To start the engine, the correct key must be used which will transmit the correct code magnetically to the coil in the steering column. This code is then fed to the immobilization unit, which will transmit various codes to the EMS2000 to enable the engine to start.

The purpose of the immobilization system is to prevent the engine from starting if the information from the immobilizer module (EWS 3) is not recognized as the correct information.

A specific unidirectional single wire line supports communication between the EMS2000 and the EWS 3. To secure the system the information transmitted from the immobilizer is encrypted. To automatically protect the system there is a time limit, which represents the maximum duration of the communication between the EMS2000 and the EWS 3.

On the automatic transmission vehicle there is a park/neutral inhibit signal that the EWS 3 receives directly from the switch in the automatic transmission. The purpose of the switch is to ensure that the engine will only crank if the automatic transmission is in Neutral or Park.