ECU BMW X5 2000 E53 Drive Away Protection Syst

8
EWS
EWS II
Starting with 1/95production, all vehicles were equipped with a new EWS system, EWS II.
This change was once again brought about to meet the next level of compliancy with the
European Insurance Commission regulations.
Purpose of The System
Changes to the European Insurance Commission regulations made it necessary to intro-
duce a new theft protection system with greater capabilities and a higher level of security.
The EWS II system operates independent of the mechanical key. The mechanical key only
makes a request of the vehicle starting system. Verification of the key electronically is
required before the starting procedure is initiated.
The system features wireless communication between a programmed EEPROM housed in
the ignition key and the EWS II control module. A key which is properly coded to the EWS
II control module is required before starting operation continues. The EWS II and the DME
control modules are synchronized through an Individual Serial Number (ISN).
The ISN, stored in the EWS II,
must match that of the DME every
time the ignition is switched “ON”
before engine operation is
allowed.
EWS II was installed on E31, E34,
E36, E38 and E39 vehicles.
Major components of the EWS II
system are:
• Key with Transponder
• Ring Antenna
• Transmitter/Receiver Module
• EWS II Control Module
• DME Control Module
8510111
EWS II