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  1. #1
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    Member No: 163104 Manolito is an unknown quantity at this point Manolito's Avatar
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    Can Immobilizer be Coded to Block Old Keys?

    Last week a burgler broke in and stole both keys, took daughter's pristine '97 328.

    Police found car yesterday, surprisingly intact.

    Ordered new key from dealer today.

    I was told that an e36 'remembers' up to seven keys. That is how it can have a rotating code yet work with multiple keys. It recognizes which key is inserted so it knows what revolving code to expect from that key.

    The same guy told me that the dealer can log in to your computer and delete/block any of the keys so they will still open the doors but they won't start the car.

    The parts man at the dealer in Washington DC says this is not possible. The car will always start with any key that it has ever used.

    Has anyone had old keys blocked in the immobilizer of an e36?

    Any suggestions on a shop in Washington DC who could do that for us?

    Thanks!
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  2. #2
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    Member No: 58057 Shogun will become famous soon enough Shogun's Avatar
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    This is what the manual of a programmer tells us, I guess that answers your question.

    Immobiliser EWS installed on the BMW cars since 1996. EWS are used on BMW E38 (7xx),E39 (5xx), E36 and E46 (3xx), E53 (X5), Z4 also on others car made with BMW cooperation - Mini Cooper, Rover 75, Range Rover.
    Supported systems:
    Supports all immobilizers modifications EWS1, EWS2, EWS3, EWS3+
    Functions:
    • Reading and writing EWS1, EWS2, EWS3, EWS3+ using CarProg Motorola cable;
    • Automatic identification EWS version of dump;
    • Adding new keys;
    • Restoring original lost key synchronization;
    • The blocking and unblocking key access to the car if car key is lost;
    • Reading and changing data coding (for the vehicle);
    • Changing parameters EWS (product number, date of manufacture, etc.);
    • Change VIN number stored in EWS;
    • Change VIN numbers in the key (stored in key after 1998);
    • Changing mileage in EWS (in EWS after 1998);
    • Changing mileage in the key;
    Works with empty PCF7935 and with original BMW keys (EMU – emulator)
    Select in CarProg BMW immobiliser Menu EWS2 old immobiliser system and read EWS data. Now you can see how many key is programmed and perform action you won. To program key just set empty PCF7935 transponder in to CarProg antenna adapter A3, select key number to program and perform key programming action.Also see in this manual how to:
    • Restore old keys (in case if old key stop to work);
    • Delete lost transponder key;
    • Change EWS settings;
    • Check key;

    S4.4.2 EWS2 immobiliser: usually used in BMW cars up to year 1996, with yellow or violet connector (white or black plastic box). Use A10 adapter and connect immobiliser like in picture:
    ....
    Select in CarProg BMW immobiliser Menu EWS2 immobiliser system and read EWS data.Now you can see how many key is programmed and perform action you won. To program key just set empty PCF7935 transponder in to CarProg antenna adapter A3, select key number to program and perform key programming action. EWS2 with processor mask 2D47J in some case can by erased while reading. But this is rare.
    • Restore old keys (in case if old key stop to work);
    • Delete lost transponder key;
    • Change EWS settings;
    • Check key;

    S4.4.2 EWS3 immobiliser: used in BMW, Mini and Rover cars year 1997-2004, with black connector (white or black plastic box). Use A10 adapter and connect immobiliser like in picture: .....

    Select in CarProg BMW immobiliser Menu EWS3 immobiliser system and read EWS data. Now you can see how many key is programmed and perform action you won. To program key just set empty PCF7935 transponder in to CarProg antenna adapter A3, select key number to program and perform key programming action. EWS3 with processor mask 2D47J can by erased while reading. This processor type is used in EWS3 software versions SW5, SW4 and SW3. Tested, that SW3 HW1 EWS3 memory will be lost while reading. Recover lost EWS3 data is impossible with our equipment. Most common problem in EWS3 immobilizers is bad ELMOS circuit. Check if this IC
    temperature in working state is normal. If ELMOS is very hot – replace it first.Also see in this manual how to:
    • Restore old keys (in case if old key stop to work);
    • Delete lost transponder key;
    • Change EWS settings;
    • Check key;

    EWS Key programmer Additional functions:
    • Restore old keys: in older BMW cars equipped with EWS2 immobiliser most common problem is key variable part synchronization loosing. This happen when battery is old and bad charged. Original transponder key remote control work, but car starter relay is not operated. Remove EWS from car, connect it to CarProg like in pictures and read EWS data. Now insert not working key in CarProg antenna and Check Key. CarProg will show key number. Just deselect this key Used box and perform EWS write operation. If you don’t have car key is possible to restore all car keys - deselect Used box for all used key.
    • Delete lost transponder key: in key data write all FFFF and perform Write EWS operation. Key will by disabled.
    • Change EWS settings: you can change EWS VIN number, mileage and perform EWS write operation. This data will by overwritten in all car keys after first engine start – in case if key is working. Also you can change EWS password, key data, EWS GM, VN, SA car coding – but be careful and not use this function if you not advanced user – you can damage car.
    • Check key: insert key in to CarProg antenna adapter and Check key validity to EWS and key number.
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  3. #3
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    Member No: 163104 Manolito is an unknown quantity at this point Manolito's Avatar
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    Thank you for all the info Shogun. This sounds like it should have been possible for a 328 manufactured in 9/96, but the dealer tried it and said that they could not do it. For the moment, she is locking out the ignition with a code in her on-board computer to keep the guy with her keys from stealing her car again. I will keep your writeup and look at it myself if I ever get access to her car again (it is clear across the country).

    The other thing that I think I learned from this is that it should be possible to re-instate the key to may 2004 325iT. I had to replace both the computer and EWS in my 325, and since then, only the key that was in use when they programmed the new units will work. Unfortunately, the indy shop that installed and coded my new computer and EWS does not know how to re-instate the other key, and the dealer will probably charge as much as a new key costs to touch it, so I may as well buy a new key.
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