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Improved Key FOB Range

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If you have a 2.5 it is purple. Pull the cover where the trunk release button is. You will see a bundle of wires inside and the purple is wound around the bundle. Unwind and straighten out or as others suggest, lengthen. If you bring your car over I will do it for you :)
 
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I have a 1.5 and they installed a sub/addl. 12V battery system in mine, so my wiring is VERY DIFFERENT.
My car radio and amp/sub draw power from a totally different system that comes up there, so there are 20+ wires in that space.

I was actually swapping my radio last weekend, so had the whole thing open. I could not see any wire that may be the key fob radio wire.
:(

Now that I have had it open once, I have to say that it is super easy. I would probably open it again, if I knew that I could figure out the key fob wire ...