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Thread: E46 cant unlock car with remote

  1. #1
    Join Date
    Jan 2018
    Location
    Sweden
    Posts
    5
    My Cars
    E46 320 2004

    E46 cant unlock car with remote

    Hello everyone im from Sweden so if my english isn’t very good thats why.
    Anyways. I have a problem with my remote key doesn’t work with my e46 320 2004. It works good if I unlock it with my key in the door and all doors unlock. I have tried initializating my key and changed battery without succses. I have mesured with a multimeter on the cables that goes from the antenna amplifyer (the thing under the rear spoiler). And I get a indication every time I press the key. So it isnt my key or the antenna that is bad. What could be the problem?

  2. #2
    Join Date
    Oct 2007
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    Northern Virginia
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    1,997
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    2020 Mercedes S560
    When this happened to me I had to have the key re-programmed at the dealer.

  3. #3
    Join Date
    Jul 2011
    Location
    Arlington, VA
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    9,923
    My Cars
    2018 BMW M240i
    Are you having any other electrical or electronic issues with the car? Cold temperatures are very hard on batteries. Google “BMW E46 hidden OBC functions.” Test #9 will show you the voltage as seen by the engine computer (DME in NMWeze).

    If all else is fine I suggest you check the electrical connections at the antenna amplifier. It’s located in the driver’s side “C” pillar.

    Also check fuses 49, 52 and 60. They’re for the locking system.

  4. #4
    Join Date
    Jan 2018
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    Sweden
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    5
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    E46 320 2004
    No other electrical problems. Forgot to say that it is a touring. Do you know where the antenna amplifier is located on the wagon?

  5. #5
    Join Date
    Jan 2018
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    Sweden
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    E46 320 2004
    Does antone know where the wires from the antenna goes?

  6. #6
    Join Date
    Jul 2011
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    Arlington, VA
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    2018 BMW M240i
    The antenna amp is in the roof liner. It’s item #2 in the link.

    http://www.realoem.com/bmw/enUS/show...diagId=65_0637

  7. #7
    Join Date
    Jan 2018
    Location
    Sweden
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    E46 320 2004
    Ah okey, what is number 5 then cause it says antenna amp too?

  8. #8
    Join Date
    Jul 2011
    Location
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    2018 BMW M240i
    I think #5 is the AM/FM amp. It seems the touring has different amps than the other 3-series bodies.

  9. #9
    Join Date
    Jan 2018
    Location
    Sweden
    Posts
    5
    My Cars
    E46 320 2004
    Aha okey that is probably it. Going to check the wireing today thanks

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