Quote:
Originally Posted by upallnight
The chip get it power from the antenna ring. The induction circuit is used to charge the battery for the key fob. You can have a dead key fob battery, but the chip to start the engine will still send out a signal to the EWS module because it is receiving the electrical charge from the antenna ring.
You can see from this photo that the chip is a stand-alone chip that is not solder to any circuit board.
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The pic you have posted is NOT an original BMW new style remote key...that is an ebay key (replica) that has a space designed in it to place a transponder chip if you are transplanting it from a BMW non-remote key...or if you are creating an unofficial remote using aftermarket equipment/software like an AK90.
But no BMW original/official diamond shaped remote key comes with a loose transponder like in your pic above.