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Discuss disengage immobiliser in the alt.auto.mercedes forum at Car Dealer Forums; Hi Mercedes 300E 1996 diesel. I cannot start my car because the immobiliser will not ...
  1. #1
    Charlie Brown
    Guest

    Default disengage immobiliser

    Hi

    Mercedes 300E 1996 diesel. I cannot start my car because the immobiliser
    will not disengage. I have changed the batteries in the key fob, I have
    tested them to see if the IR light comes on and the recovery mechanic
    checked them on his machine. I have checked the manual to synchronise the
    sender/receiver (press fob twice) and its still no good (my spare key is
    only 6 months old, it cost me 120). When I turn on the ignition I get
    red/green flashing at the rear mirror receiver. The car cranks OK but will
    not fire. Is there anything I can do before I call out Mercedes tomorrow?
    I know one they are on the case it will cost me a fortune. In case it is
    relevant, the car is kept in a dry garage and is only used about once a
    fortnight.

    TIA

    Charlie Brown





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  2. #2
    Tiger
    Guest

    Default Re: disengage immobiliser

    Make sure your battery on the car is in good shape... if it is old or weak,
    you will get lots of problem. Check voltage and do a battery test.



  3. #3
    Tiger
    Guest

    Default Re: disengage immobiliser

    Another thing... is your glow plug light lighting up as normal? Immobilizer
    usually won't let you crank the engine at all.



  4. #4
    Charlie Brown
    Guest

    Default Re: disengage immobiliser

    tiger

    My battery is about 3 years old, although untested , it has been OK and
    starts the car first shot after 2 weeks idle. It is flat today though,
    after flogging it yesterday. the glow plug light works OK. I am in danger
    of calling Mercedes very soon!

    Charlie Brown


    "Tiger" <tiger0002@hotmail.comn> wrote in message
    news:ts6Gg.7163$0a5.6616@newsfe09.lga...
    > Another thing... is your glow plug light lighting up as normal?
    > Immobilizer usually won't let you crank the engine at all.
    >




  5. #5
    Tiger
    Guest

    Default Re: disengage immobiliser

    I don't think it is the immobiliser that is preventing you from starting...
    If you could... hook up a jumper cable to another car as usual and let that
    car run... about 2000 rpm.

    On your car... try starting with petrol pedal fully depressed... after the
    glow plug light goes out. If it does attempt to fire up, the keep going. Do
    not crank for more than 45 seconds at a time. and let 5 minutes to cool down
    the starter.

    If it still does not attempt to start... are you sure you got enough diesel
    in the tank? Maybe it could be your fuel pump.



  6. #6
    Charlie Brown
    Guest

    Default Re: disengage immobiliser

    Tiger

    Mercedes are rubbing their hands together as we speak. It was towed away
    this morning with a completely flat battery. I will get myself a jump
    start/charger unit this weekend. there was no juice left to do anything
    more. Thanks for your help. I will get back with their solution later.

    Charlie Brown


    "Tiger" <tiger0002@hotmail.comn> wrote in message
    news:n5jGg.893$%D.745@newsfe12.lga...
    >I don't think it is the immobiliser that is preventing you from starting...
    >If you could... hook up a jumper cable to another car as usual and let that
    >car run... about 2000 rpm.
    >
    > On your car... try starting with petrol pedal fully depressed... after the
    > glow plug light goes out. If it does attempt to fire up, the keep going.
    > Do not crank for more than 45 seconds at a time. and let 5 minutes to cool
    > down the starter.
    >
    > If it still does not attempt to start... are you sure you got enough
    > diesel in the tank? Maybe it could be your fuel pump.
    >




  7. #7
    Dori A Schmetterling
    Guest

    Default Re: disengage immobiliser

    I hope you used the services of a motoring organisation if you were
    appropriately covered. The tow should be free then.

    Did it a few months ago. Could have had a tow (well, transport on the back
    of a lorry) under the Mercedes Mobilo Life scheme but it would cost if not a
    manufacturing fault (which it wasn't) so used the RAC. Saved 120 quid,
    IIRC.

    DAS

    For direct contact replace nospam with schmetterling
    ---

    "Charlie Brown" <charlie.brown@homecall.co.uk> wrote in message
    news:44e9c3c0$1_4@mk-nntp-2.news.uk.tiscali.com...
    > Tiger
    >
    > Mercedes are rubbing their hands together as we speak. It was towed away
    > this morning with a completely flat battery. I will get myself a jump
    > start/charger unit this weekend. there was no juice left to do anything
    > more. Thanks for your help. I will get back with their solution later.
    >
    > Charlie Brown
    >
    >
    > "Tiger" <tiger0002@hotmail.comn> wrote in message
    > news:n5jGg.893$%D.745@newsfe12.lga...
    >>I don't think it is the immobiliser that is preventing you from
    >>starting... If you could... hook up a jumper cable to another car as usual
    >>and let that car run... about 2000 rpm.
    >>
    >> On your car... try starting with petrol pedal fully depressed... after
    >> the glow plug light goes out. If it does attempt to fire up, the keep
    >> going. Do not crank for more than 45 seconds at a time. and let 5 minutes
    >> to cool down the starter.
    >>
    >> If it still does not attempt to start... are you sure you got enough
    >> diesel in the tank? Maybe it could be your fuel pump.
    >>

    >
    >




  8. #8
    Charlie Brown
    Guest

    Default Re: disengage immobiliser

    Dori

    Absolutely right. I was hoping that Mercedes would send an engineer to me
    with a computer or gadget to bypass the immobiliser. They said they don't
    do that anymore as all non starters are collected by a tow firm under
    contract. They would have billed me for the transport cost to their nearest
    distributor. Luckily I was covered by . FYI, the problem is the result of
    a faulty K40 relay switch - total cost 300!

    Charlie Brown


    "Dori A Schmetterling" <ng@nospam.co.uk> wrote in message
    news:xp-dnbxZhKkUjHfZRVnytQ@pipex.net...
    >I hope you used the services of a motoring organisation if you were
    >appropriately covered. The tow should be free then.
    >
    > Did it a few months ago. Could have had a tow (well, transport on the
    > back of a lorry) under the Mercedes Mobilo Life scheme but it would cost
    > if not a manufacturing fault (which it wasn't) so used the RAC. Saved 120
    > quid, IIRC.
    >
    > DAS
    >
    > For direct contact replace nospam with schmetterling
    > ---
    >
    > "Charlie Brown" <charlie.brown@homecall.co.uk> wrote in message
    > news:44e9c3c0$1_4@mk-nntp-2.news.uk.tiscali.com...
    >> Tiger
    >>
    >> Mercedes are rubbing their hands together as we speak. It was towed away
    >> this morning with a completely flat battery. I will get myself a jump
    >> start/charger unit this weekend. there was no juice left to do anything
    >> more. Thanks for your help. I will get back with their solution later.
    >>
    >> Charlie Brown
    >>
    >>
    >> "Tiger" <tiger0002@hotmail.comn> wrote in message
    >> news:n5jGg.893$%D.745@newsfe12.lga...
    >>>I don't think it is the immobiliser that is preventing you from
    >>>starting... If you could... hook up a jumper cable to another car as
    >>>usual and let that car run... about 2000 rpm.
    >>>
    >>> On your car... try starting with petrol pedal fully depressed... after
    >>> the glow plug light goes out. If it does attempt to fire up, the keep
    >>> going. Do not crank for more than 45 seconds at a time. and let 5
    >>> minutes to cool down the starter.
    >>>
    >>> If it still does not attempt to start... are you sure you got enough
    >>> diesel in the tank? Maybe it could be your fuel pump.
    >>>

    >>
    >>

    >
    >




  9. #9
    Charlie Brown
    Guest

    Default Re: disengage immobiliser

    All

    the flashing immobiliser was a symptom of the problem. The failed K40 relay
    switch shut off power to the fuel pump and because of the power failure, the
    immobilser lights flashed because they were on the same circuit. This is
    explained as best as I understand it.

    HTH

    Charlie Brown


    "Charlie Brown" <charlie.brown@homecall.co.uk> wrote in message
    news:44eb4b23_3@mk-nntp-2.news.uk.tiscali.com...
    > Dori
    >
    > Absolutely right. I was hoping that Mercedes would send an engineer to me
    > with a computer or gadget to bypass the immobiliser. They said they don't
    > do that anymore as all non starters are collected by a tow firm under
    > contract. They would have billed me for the transport cost to their
    > nearest distributor. Luckily I was covered by . FYI, the problem is the
    > result of a faulty K40 relay switch - total cost 300!
    >
    > Charlie Brown
    >
    >
    > "Dori A Schmetterling" <ng@nospam.co.uk> wrote in message
    > news:xp-dnbxZhKkUjHfZRVnytQ@pipex.net...
    >>I hope you used the services of a motoring organisation if you were
    >>appropriately covered. The tow should be free then.
    >>
    >> Did it a few months ago. Could have had a tow (well, transport on the
    >> back of a lorry) under the Mercedes Mobilo Life scheme but it would cost
    >> if not a manufacturing fault (which it wasn't) so used the RAC. Saved
    >> 120 quid, IIRC.
    >>
    >> DAS
    >>
    >> For direct contact replace nospam with schmetterling
    >> ---
    >>
    >> "Charlie Brown" <charlie.brown@homecall.co.uk> wrote in message
    >> news:44e9c3c0$1_4@mk-nntp-2.news.uk.tiscali.com...
    >>> Tiger
    >>>
    >>> Mercedes are rubbing their hands together as we speak. It was towed
    >>> away this morning with a completely flat battery. I will get myself a
    >>> jump start/charger unit this weekend. there was no juice left to do
    >>> anything more. Thanks for your help. I will get back with their
    >>> solution later.
    >>>
    >>> Charlie Brown
    >>>
    >>>
    >>> "Tiger" <tiger0002@hotmail.comn> wrote in message
    >>> news:n5jGg.893$%D.745@newsfe12.lga...
    >>>>I don't think it is the immobiliser that is preventing you from
    >>>>starting... If you could... hook up a jumper cable to another car as
    >>>>usual and let that car run... about 2000 rpm.
    >>>>
    >>>> On your car... try starting with petrol pedal fully depressed... after
    >>>> the glow plug light goes out. If it does attempt to fire up, the keep
    >>>> going. Do not crank for more than 45 seconds at a time. and let 5
    >>>> minutes to cool down the starter.
    >>>>
    >>>> If it still does not attempt to start... are you sure you got enough
    >>>> diesel in the tank? Maybe it could be your fuel pump.
    >>>>
    >>>
    >>>

    >>
    >>

    >
    >




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