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Thread: Manually changing the battery on the key fob (non CA).

  1. #1
    Join Date
    Dec 2017
    Location
    PA
    Posts
    9
    My Cars
    2008 328xi

    Manually changing the battery on the key fob (non CA).

    I have a 2008 E92 328xi (non CA). My key fob has been slowly refusing to work, each time taking longer until it died. At least my valet key works.

    https://www.youcanic.com/guide/bmw-k...ry-replacement

    Based on the above article, I'm going to try and replace the key with a CR 2032. What are the chances it will stop working with the transponder? This is my only key and I depend on it for transformation.

  2. #2
    Join Date
    Jan 2016
    Location
    Ca
    Posts
    6,981
    My Cars
    2001 525it
    First off you need to always have another key for all sorts of reasons. The battery works the buttons on the key it does not effect the ews chip and starting systems. I recently took my key apart on my e39 to replace the battery, but after testing the battery I found it was just fine. Then I initialized the circuit board to the car and it worked fine. I came to the conclusion that the buttons in key body the don't really move that much when pressed, so the micro switches are not being pressed far enough to have the circuit board work. So when i pressed the circuit board firmly into the key part that had the push buttons it worked I fine. So did a little sanding to make sure it would happen and when gluing the halves back together I used plastic epoxy and clamp the key together on the edge of my work bench using an actual clamp for wool working. The key has worked ever since.

  3. #3
    Join Date
    Dec 2017
    Location
    PA
    Posts
    9
    My Cars
    2008 328xi
    How did you initialize the circuit board to the car?

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