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Does the car start? Or is it just the remote functions that are not working?
Click this LINK and This LINK and save the files. On the remote push the button that removes the metal key and take it out of the remote. Then use a screwdriver to pop the case of the remote in half as seen in the pictures. The battery is right there + side up.
Ok then it is likely just the battery. I see that you requested a phone consultation but it failed. I will send another phone offer. Did you get the reply with the remote disassembly info?