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Introduction For (EWS)

The components of EWS
The components of EWS
Purpose of the System

The purpose of the Drive Away Protection system was to reduce vehicle theft as mandated by the European Insurance Commission to combat the high theft rate in European Countries.
This first version of the Drive Away Protection System added a circuit from the General Module to the DME. The added circuit was spliced into the existing code function from the Board Computer (BC) to the DME.
The components of the Drive Away Protection System are:
• Door Lock Switch
• General Module
• Board Computer
• DME

 

System Components

Door Lock Switch:
The door lock switch provides a 12V (High) signal to the GM when the vehicle is locked from the outside. The switch also provides a Low signal to the GM when the vehicle is unlocked.
General Module:
The GM receives the lock and unlock signals from the door lock switch and signals the
DME with a 12V High signal when the vehicle is double locked or with a Low signal when this vehicle is unlocked.
Board Computer:
The Board Computer (BC) through its’ code function provides a High signal to the DME to disallow vehicle operation or a Low signal to allow vehicle operation.
DME:
The DME looks for a High/Low signal from the BC or GM and dependent on the signal, it will either allow or prevent vehicle operation.

 

 

Principle of Operation

When the vehicle is locked from the outside, a High signal is sent to the GM from the door lock switch. The GM receives this High signal and outputs a High signal to the DME. The circuit from the GM is spliced into an existing circuit from the BC to the DME.
A High signal from the GM (or BC) causes the DME to cancel the fuel and spark functions to the engine resulting in a no-start condition. The vehicle must be unlocked with the key or the code function of the BC cancelled for the DME to allow engine operation.
The status pages of the ZKE and DME will show the condition of the Drive Away Protection signal as High/Active or Low/Not Active.
 

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BMW ECU Programming
Description
This is about the EWS system main components and principle of operation
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