Replacing Your Car Key Battery. The replacement may only be available through the manufacturer and ordering the key may take a week or two. Its best to pry it open in a few different places so you dont break the key fob.
Depending on which car key you have you may need to lift out the circuit board of the remote to reveal the battery. Get a good car key battery. Put the key in the ignition and remove it Open and close the driver door twice in forty seconds again Put the key in the ignition and close the drivers door Turn the ignition on and back to lock three times in one-second intervals.
And in the hands of a professional they can also easily check the voltage to ensure your batteries are at fault.
The battery will be flat and round like a large watch battery and stored in the head of the key fob. Note the battery and - position as some fobs may not have the labeling inside. The first step is to open up your key fob. If your car key fobs range has diminished the buttons arent responding to your touch or the vehicle is having trouble recognizing its proximity the key fob battery is probably dead.