You can use BMW Scanner to see when the car thinks it is receiving a signal. I don't remember if a Foxwell will tell you that.



However I think the trunk release uses the same communications module (the FZV antenna behind the rear spoiler) as the keyless entry, so if that works it would indicate a key side problem. There are a few folks out there you can send the diamond keys to, who will fix solder issues and replace batteries for like $50/key (instead of $200 for a new one).

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2003 3.0 5MT Topasblau
Purchased in 2016 and sold in 2024
2012 35d Platingrau