![]() This is somewhat advanced, but with a garage door opener I once had, one of the remotes worked well and the other didn't. If you have a soldering iron and know how to use it, you might try touching up the soldered joints in the remote, especially the ones for the battery and for the antenna (if the antenna isn't part of the circuit board). (BTW, this same trick works on many TV remote controls.) Touch up solder joints Sometimes these carbon buttons will fail due to dirt or moisture or corrosion so gently cleaning them (and any other contacts, such as the battery) with a pencil eraser will fix the problem. It is intended to contact a small matching interlocking comb pattern of copper (or sometimes carbon on copper) on the circuit board. Many remotes use a carbon "button" embedded into a flexible membrane. after you've spent an hour or so taking the door apart. If not, sometimes all that's required is a little lithium grease on the locking mechanism. Verify by using the electronic locking buttons within the car to see if they reliably lock and unlock the doors. If you hear that but the door doesn't reliably unlock, the problem is much more likely to be the locking mechanism in the door rather than either the transmitter or receiver. Usually, if you're close enough to the vehicle, you can hear the "click" of the lock solenoid. ![]() Check the locking mechanisms in the doors There's often a big difference in performance (distance between you and the vehicle) depending on which side of the vehicle you approach. ![]() Many cars have the receiver mounted to optimize reception from approaching the driver's side door. Make sure you're on the driver's side of the car If you get the same symptom with a fresh battery, verify that the battery really is fresh by measuring the voltage if you have a voltmeter. It's also pretty inexpensive, so a good thing to try. You already know this one, but it's the easiest and most typical fix. Just for completeness, I've already listed two things you've already tried - they're primarily for anyone who reads this some time in the future. I have had a similar issue with remote controls before. ![]()
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