EWS w BMW E39.pdf

Table of Contents

EWS

Subject

Page

Drive Away Protection..................................................................................3

EWS I...........................................................................................................5

EWS II..........................................................................................................8

EWS III (3.2)...............................................................................................16

EWS III (3.3)...............................................................................................20

EWS III D (3-D)...........................................................................................24

Worksheets................................................................................................27

Review Questions.......................................................................................30

Initial Print Date: 5/01

Revision Date:

Drive Away Protection System (EWS)

Model: EWS I/EWS II/EWS III/EWS III D

E31/E34/E36/E38/E39/E46/E52/E53

Production Date: All since 1/94

Objectives

After completion of this module you should be able to:

• Explain the differences in the EWS systems.

• List the components that make up the different EWS systems.

• Describe the operation of each system.

• Understand and relate the data exchange sequence between the EWS and DME.

EWS

Drive Away Protection

The first version of Drive Away Protection was installed on production vehicles 9/93

through 12/93.

Purpose of The System

The purpose of the Drive Away Protection system was to reduce vehicle theft as mandat-

ed 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.

EWS

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.

Lock

Double Lock

Switch

Double Lock

Additional Circuit

12V

Active

Code

Function

Not

Active

8510101

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.

EWS

EWS I

EWS I was installed on vehicles beginning production 1/94 , replacing the original Drive

Away Protection System.

Purpose of the System

The next level of compliancy with the European Insurance Commission required additional

changes from the previous system. An additional component was added called the Starter

Immobilization Relay . This relay module provides added theft prevention and safety fea-

tures.

At the time of introduction the system was referred to as Electronic Drive Away

Protection which in German is Electronische Wegfahrsperre or EWS.

The EWS I system consisted of the following components:

• Starter Immobilization Relay

• Door Lock Cylinders and Switch

• General Module

• Board Computer (if equipped)

• Transmission Range Switch

• DME Engine Speed Signal (Beginning 6/94 Production)

• DWA (E31)

System Components

Starter Immobilization Relay

8510104

The Starter Immobilization Relay was installed on E31, E34 and E36 vehicles.

It was in the following location:

E36 -In the relay carrier to the left of the steering column.

E31/E34 -In the “A” pillar above the footwell kick panel speaker.

The Starter Immobilization Relay functions as a “Smart Relay”, a relay which receives inputs

from various sources looking at the proper combination of input signals before activating a

component, in this case the starter.

The Starter Immobilization Relay receives input from:

• Ignition Switch

• General Module

• Board Computer

• Trans Range Switch • DME (>6/94)

And processes output to:

• Starter

• DME

EWS

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