Specifications

Testing Testing Immobilizer (EWS) Systems

The DME automatically burns the rolling code table into its memory. Once performed, it cannot be

changed. Once a DME is “married” to the vehicle, it will not work in any other vehicles. Under

certain conditions, “alignment” of the DME and EWS 3.3 modules may still be necessary. The

alignment procedure resets the code table to code #1—it does not change the rolling code table.

Important Tips Regarding EWS III

•

With EWS 3.3, the rolling code also changes the ISN every time the vehicle enters the start

sequence. This means the DME is no longer the source for the ISN as with earlier EWS 3.2

and EWS II systems.

• EWS 3.3 DME or the EWS modules are permanently locked or married together and to the

vehicle. They cannot be used in any other vehicles.

• All EWS III replacement DME modules are purchased blank and then flash programmed

using the factory scan tool. Part of the programming includes the EWS sending the rolling

code table to the new DME, which is then burned into memory. The EWS then resets its rolling

code back to position 1.

• EWS/DME alignment resets the rolling code back to position 1 in both modules.

EWS III Key Activation/Deactivation

Keys that are lost or stolen may be deactivated or made to not operate the starter functions. The

factory tool has the ability to activate and deactivate EWS III (3.3) keys. Any key may be “barred”

except the key in the ignition at the time of deactivation. The lost or stolen key can be identified by

the identification of the remaining keys. There is no limit to the number of times a key can be

activated/deactivated.

NOTE:

i Note the following regarding key activation:

• While checking key operation, wait 10 seconds before inserting the next key because the ISN

is still being transferred after the key is shut off (the EWS system is not activated until after 10

seconds). If you do not wait for 10 seconds, a bad key could still start the vehicle.

• A dead key battery does not affect vehicle starting.

• In approximately 2000, new style keys with non-replaceable batteries (featuring the blue and

white BMW roundel) are only charged when the ignition switch is turned on. See “Key Type

#3” on page 64.

CAS

The CAS system is used on the E65, E66, E60, E63, and the E64.It stands for Car Access System

(CAS) and provides access to the vehicle by controlling the functions of the central locking

system. It also controls the statuses of circuits KL R, KL 15, KL 50 via the ignition SW/Starting

button. The CAS combines previously installed separate control units into one unit.

Terminal Status Master:

• KLR, KL15, KL50

• Hardwire outputs

• Bus telegrams