Hi,
FYI, the Key does not turn off after 5 days, rather, the car essentially stops listening for it after 120 Hrs.
If you have changed the battery and you get the LED to light (or not), I suspect you have a faulty Key Fob.
Replacements are available on eBay, but be certain that the Code Card comes with it, or it's useless. You'll need a Dealer Service to program the Car to that new Fob. Hope this helps...
Happpy Motoring!... Jim'99
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