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Thread: BMW vehicle communication software manual

  1. #1
    Join Date
    May 2004
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    Japan
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    Default BMW vehicle communication software manual

    some info:

    .10 Testing Immobilizer (EWS) Systems
    EWS stands for the German words “Electronic Wegfahrsperre” meaning electronic driveaway protection. Starting in 1994, BMW vehicles came equipped with EWS, which disables fuel and ignition using door locking input from the General Module to the DME.
    There are three versions of EWS currently in use:
    • EWS I
    • EWS II
    • EWS III
    4.10.1 EWS I
    Beginning with the 1994 model year, all cars were equipped with EWS I. This system still uses a mechanical key but added a “Starter Immobilization Relay” preventing the starter from operating. It functions as a smart relay which only allows starter activation if a specific combination of inputs is met.
    The EWS I system is activated when the vehicle is locked from the outside with the key. When activated, the EWS I system performs the following functions:
    • Prevents the engagement of the starter
    • Disables the fuel injection system
    • Controls the neutral safety switch
    4.10.2 EWS II
    At the start of the 1995 model year, EWS I was replaced with EWS II, which is used on E31, E34, E36, E38 and E39 vehicles. EWS II incorporates all of the functions of the previous EWS I but uses an electronic key. There still is a mechanical key, but an electronic component was added interfacing to the ignition switch which is part of the EWS function. EWS II provides immobilizer protection electronically through a coded chip imbedded in the key and prevents
    vehicle operation until the ignition key has transferred the correct code (random changing code) to the EWS control module. EWS II permanently assigns an “Individual Serial Number” or “ISN” to the DME, which is also stored in the EWS. The DME and the EWS modules must match the “ISN” every time the ignition is powered on or the engine will not start.
    With EWS I and EWS II, the DME and the EWS are not permanently married or locked together. Diagnostic testing with either a used DME or EWS is possible (EWS II will require ISN re-alignment procedure as outlined below).
    Up to 6 additional keys may be ordered as replacement keys. The EWS II control module is codeable for only 10 keys (4 delivered with vehicle and 6 replacement
    ..... and more

    http://www1.snapon.com/display/DocMg...px?fileid=4653

  2. #2
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    Mar 2006
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    Default

    Is there another link that is still active with the rest of the information? Looks like good information so far but would like to read the rest.

  3. #3
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    Feb 2004
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    Default

    My car with alarm going off... can still crank the starter... but cannot start the car.

  4. #4
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    Default

    Quote Originally Posted by pgrindstaff View Post
    Is there another link that is still active with the rest of the information? Looks like good information so far but would like to read the rest.
    try again this one
    http://www1.snapon.com/display/DocMg...px?fileid=4653

    takes about 5-10 seconds to work

  5. #5
    Join Date
    Mar 2006
    Location
    Marietta, GA
    Posts
    383

    Default

    Thanks Shogun, that worked much better. I think a better title for you would be Grand Master at finding BMW related documents .

    As a side note, I have the interface and software with the ability to do the above procedures but have not been brave enough to mess around with EWS alignment. Too much trouble can be caused by messing with an already finicky system.

    Thanks again Shogun, you rock.

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