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I just bought a 2009 XLE V6 so a certain answer to this would be nice to know.
Here's my reasoning though this situation for whatever its worth (not a toyota tech, but work on high end metal detectors and xray systems that are much more complicated and expensive than a car)
anyways.
You said you replaced the batteries and reprogrammed. 5 years is not out of the norm for a battery to die, however it is unlikely that they would both die at the same time. I am not buying the dealer's "they just die" argument. The remotes are built to take a beating. and if you are like me, one of the remotes stays at home, and the other one goes with me and eventually gets beat up.
unless you had both in your pocket and took a swim, i am thinking that the remotes are fine and that the problem is in the receiver circuit in the car.
Someone with more familiarity with how the system works could help us more here. I something keeps the memory live in the receiver if the receiver uses RAM to store info, otherwise you would lose the programming when the main battery was disconnected. More likely is that the receiver uses a programmable ROM, which would not need an additional battery.
My thoughts would be the following:
+failing battery in receiver RAM (if the receiver uses RAM)
+corrupted ROM in receiver
+some issue that damaged both transmitters at the same time like submerged them, hit them with massive amounts of RF, (microwave uplink) drove over both at the same time, etc
++most likely solution: broken/poor connection in wiring to receiver or bad receiver itself.
I would try a new receiver circuit (if that is even available) and if the problem is gone, cool. If not, It would have to be a damaged cable feeding the receiver.
If you find the answer, let us know
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