2001 E46 EWS Rolling code sync issue

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  1. 2001 E46 EWS Rolling code sync issue 
    #1
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    2001 E46 EWS Rolling code sync issue
    Guys after a bit of technical help...

    My mates 2001 330d e46 has got a EWS error after recent battery issues. Basically the EWS is not accepting the key comes up with Random Code Error. The error shows in the DDE fault log and the EWS fault log. Car does not crank...

    What we have tried so far:

    Re syncing the DDE with the EWS in INPA via DDE>EWS SYNC Values. We can get the codes to clear down after doing this but wont start and same EWS random key code comes back in.

    In DIS under Service Functions > EWS > we have ran the various test plans, on the key status plan everything comes back as expected apart from the key random code, reports NOT OK. Tried the WRITE KEY Variant plan, this wont allow you to disable or enable the currently active keys.

    Try to run the EWS III Calibration plan, this wont run, just comes up with various errors ??

    I have SSS/Progman and this communicates with the car....anything in this we can try ...not done to much exploring in this due to not wanting mess up the VO.

    Any subjections of what to try next? and yes he only has 1 key!
     
     

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    I few people have said this DIS gets some errors on some of the EWS syncs.
    The EWS syncs are for the rolling codes from the EWS to the ECU.

    Your mismatch is in the key to the EWS, and I'm not sure if that is able to be synced. The only options I can think of that would work are a new key from BMW, or possibly a reset of the key's status from inside the EWS unit.

    You have to think of it like a USB stick, at first, the key will show a password to the EWS unit. Once they both agree it is the same password, they'll check the rolling codes. Once done, the engine will be able to start, and the EWS unit will give the key the next rolling code.
    What would have happened is that during that engine start, the battery voltage dropped off, and it didn't finish writing the new rolling code into the chip, like pulling out a USB stick midway through sending a file to it.
     
     

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    #3
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    The new key idea is something that we considered, plus he really needs a spare! I take it the new key is synced to with the EWS from the factory? I seem to remember last time I ordered one the only thing needed to be done was initializing the remote locking...

    What lines are you thinking of for resetting the keys status from inside the EWS?
     
     

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    The new key will have the password in it, set up from the factory, but without the rolling code. On it's first use, it'll then swap codes and carry on as normal.
    The reset is opening the EWS box, reading the info in the microprocessor that runs the EWS, and telling it the key is unused. The idea is it will kickstart the swapping of rolling code tables again.
     
     

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    Thanks. Ok from this and a bit more reading I am getting that there is no easy way of resetting the rolling code, either a new key or a specialist it is then....
     
     

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    Just a update on this.

    New Valet key ordered from BMW (£38), car fired first time.

    The old key has had the transponder replaced and coded to the car by a local key specialist (as if to be a brand new key from BMW). No need to replace the EWS module.

    So if you only have one key...consider getting a spare.
     
     

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