1995 E36 m3 immobiliser/ews problem

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  1. 1995 E36 m3 immobiliser/ews problem 
    #1
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    hi guys, i have a '95 3.0 m3 with a std bmw alarm(3g) mk1 and ews

    over winter the battery died, i dont know how long for as i dont use the car in winter.
    when i charged it back up the car had forgotten the alarm remote.
    i could lock/unlock the doors with the key but not the alarm remote.
    after a bit of meessing about, with the key and buttons, i got the remote working again.
    now the alarm works as it should, but i cant get the car to start
    it was all working fine when i parked it up.
    when i turn the key i get ign lights, but then turn to crank and nothing happens.

    i can hear any relays clicking, no starter, cant hear the fuel pump priming but not sure if i should?
    theres a permanent live at the starter but no signal when cranking.
    does this sound like a ews/immobilser fault?

    nothing i do will make the car start.
    any ideas on how to get the car going again?
    cheers
    Last edited by mark@vorny.co.uk; 09-01-2011 at 22:41.
     
     

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    Are you 100% sure the battery is OK? If it has failed you'll still get the lights but nothing else and clicking from the relays.

    Assuming you've tried a replacement battery or a jump start then read on....

    Sounds like you have read this....

    http://www.bimmerforums.co.uk/forum/...3g-ews-t39173/

    As you have been fiddling (with the best of intentions) there could be some confusion with the EWS system. Firstly check the bootlid wiring as per the guide. This often shorts the CL system. Next make sure the alarm is unset and try locking & unlocking the car with the key, then try to start it (this will send the unset signal to EWS). Lastly try another key if you have one.
     
     

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    thanks for the reply,
    yes i have read that thread, it helped me know what i have lol

    the battery on the car is fine, fairly new, fully charged and ive also tried it with the charger connected and set to boost(basically jump started while plugged into the mains)
    there is no clicking of relays/starter like a flat battery would give. theres no live to the starter when the car is cranked.

    i have tried starting the car after using the alarm and key in both doors, still nothing.

    unfortunately i dont have a spare key or alarm fob
    bootlid wiring is fine, its like new under there.
    it seems more of an immobiliser prob than an alarm prob.
    where is the starter relay?

    i also tried to disconect the battery, wait 5 mins, turned key to p2 then reconect the battery
    still nothing
     
     

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    Have you checked the fuses?

    Have you pulled the rubber back to check the bootlid wiring?

    Has the car been outdoors all winter? Plenty trees etc in your neighbourhood?

    You can download the wiring diagram here...

    http://www.wedophones.com/BMWManualsLead.htm
     
     

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    all fuses are ok, tried a different relay for the dme, pulled the boot wiring rubber off (no damaged wires),
    the car has been outside all winter and theres hardly any trees, u thinking wet dme? i took the cover off the compartment and theres no evidence of it being wet, but i could take it out and open it up if its worth a look?
     
     

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    Quote Originally Posted by stu21t View Post
    theres no live to the starter when the car is cranked.
    Have you confirmed this with a meter?
     
     

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    yep put a power probe on the terminal and when i cranked it nothing happened
     
     

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    If the compartment is dry then it's unlikely there will have been an issue.

    Your car is a 1995, was it built in 1995 or late 1994? - If manufactured before Jan 95 it will have EWS I and there is a starter immobilisation relay instead of the chip/transponder system that EWS II uses. All the info I have seen is from the USA which states the relay is "In the relay carrier to the left of the steering column" which I take to mean behind the glovebox on UK cars.

    If it is post Jan 1995 and you have EWS II it may be time to order a second key and try that. Keys can lose their coding and it is not unknown for previously "broken" keys to start working once a newly coded key has been used. Worst case you'll have a spare key!

    After that then unless there is a failure of the EWS module (which is coded to the DME for EWS II) then it suspect it may not be an immobiliser problem after all!
     
     

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    its jun 95 i think so ewsII

    im 99% sure its an immobiliser fault as the car was working fine when i parked it up.

    i dont suppose theres anyway of diagnosing a dodgy key?
    or can the car relearn the key at all?
     
     

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    No way of self-diagnosing that I'm aware of.

    I've read that once the new key has been used old keys can "magically" comes back to life, I guess they just start recognising previously coded keys once EWS is kicked back into life!

    You could probably get the key recoded at the dealer but I doubt you'll pay less than an hours labour and at the end you'll still have one key. New keys are around £30 to £40 and come cut & coded.

    I'd still give some thought to a dodgy connection / earth somewhere.

    You could always try something like putting the key in the ignition, switching to position 2 and disconnecting & reconnecting the battery - it may jump EWS back into life! Or try the key in upside down, or give it a wiggle when you try & start the car

    Sorry, I'm clutching at straws here as there is only so much you can do over the web.
     
     

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