Specifications

Testing Testing Immobilizer (EWS) Systems

EWS Functions:

• “Remote control Identification

• “Rolling code ISN

• “EWS3.3

Central Body Electronics:

• “Main Central Locking controller

• “Window function master

• “FBD functions (Evaluates RF signals from remote control)

Gateway Functions:

• “Gateway between K-can-S and K-can-P

• The CAS is capable of waking up the vehicle electrical system and is responsible for

redundant storage of: VIN, Vehicle Order (FA) Total mileage driven, CBS (Conditioned Based

Service) Data.

• The EWS functions have been integrated into the CAS control unit. Transponder

authentication is analogous to the method used by EWS 3.3. The encoding process has been

changed compared to that of previous versions, to increase security.

Starting Function CAS

After a start request from the Start button, starting takes place if the following conditions are met:

• “Valid transponder detected

• “Brakes actuated (service brake pedal depressed)

• “Selector lever in P or N

The CAS sends a message (ISN) with a random code to the DME. The DME enables the ignition

and fuel injection, the fuel pump is actuated as soon as a corresponding speed signal is sent on

the bus by the DME.

NOTE:

i The starter is actuated independently of the CAS ISN using the terminal 50 signal. If the starter

turns and the engine fails to start, there may be a communication problem between the DME and

the CAS.

EWS Encoding

The EWS control module stores the central coding key and the vehicle identification number

(VIN). If the EWS control module is replaced, the vehicle systems must be encoded with the

central coding key and VIN. This process using the factory scan tool encoding program transfers

either automatically or manually the central coding key (“Appendix C Electronic Control Module

Coding and Programming” on page 116) and VIN to the appropriate modules. If the coding key

and VIN can be read out from the defective EWS control module, it can be stored and transferred

to the replacement EWS control module.

For EWS II, encoding will also transfer the ISN from the defective EWS to the replacement EWS

control module.