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WIth car remotes they do not need re-coding if the battery is replaced within a few minutes of the old one being taken out.
source: car remote battery sales assistant.
If the remote works for sometime once the battery is put into , it means that the circuit is erratic as the frency seems to change from the set value. This can be a fault in the processor IC in the remote, a fault in the crystal or associated capacitors. Check also the IR driver transistor which can be leaking and so changes the output.
It's unlikely that you need a new remote. It simply needs to be reprogrammed with the correct code again. Remotes can "forget" the programmed codes if the batteries run down completely or if the new batteries aren't inserted quickly enough.
If the antitheft system is armed and isn't recognizing the key for starting, the dealer should be the next place it should be towed for reprogramming the key to the computer.
first you should double check to make sure the batteries are installed correctly ,then get the new car manual out of the glove box ,and check for the reprogram procedure for your remote . every car manufacture has there own procedure , example,I have 03 mustang mach 1 the procedure goes something like this.turn key to on position..put drivers side window up then down open and close driver door then turn lights on and off then radio on off and so on
You should not have to reprogram the remote if you are just changing the battery. I would first check to make sure you put the battery in correct side up. If that didn't work try disconnecting both terminals on your car battery for 10 minutes. Then reconnect them and try your key fob. This has worked for many people and I have no idea why.
If you have the original remote, it does not need any reprogramming because the Sony code will be the first one even if you change the batteries.
Try pressing the TV key on it if you have the RM-Y185 remote, also try to move the switch to the AV1 position.
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