Your Ford Falcon remote buttons were getting harder to press?
First you bought a new CR2032 battery, but that didn't do much. Next you wore through the rubbery buttons, but discovered that you can buy a new shell from ebay. That helped, but not for long. Finally, you came to terms that it was those little surface mount microswitches on the circuit board that just don't work properly anymore and you were just about to give up and never lock your car again...and then you found this!
Good news, I have two solutions.
First, take battery out and squirt isopropyl alcohol on the switch (metho will do if that's all you have), get it on top, through the sides, all through it. You've got nothing to lose. Press the switch over and over, wipe with a rag, repeat. Keep going. You will find that the switch will get clickier again, I even had one that some blue corrosion goop came out. You'll find they clean up well.
Put it back together and if you are lucky, it will work like new! One of my remotes did, the other one not quite as well. On this occasion I left it at that.
The next time I had another broken fob in my possession, the microswitches had snapped off. I think this one may have gone for a swim in soft drink? A problem - the existing switches are some fancy surface mount device; they don't have legs out the side you can solder. Must be some fancy wave soldering technique to originally attach them. I grabbed a box of miscellaneous fob microswitches from AliExpress, hoping that one of them would be a close enough fit, and there was one that had the right pinout and was very close to the same size. I can make that work, yay.
The strategy is simple. Clean the board, touch a tiny dob of hot solder to the 4 connecting points. Touch a tiny dob of hot solder to the underside of the microswitch connecting points. Then, with a magnifying glass and a steady hand, hold the switch in position and press the soldering iron on the switch legs and let the heat melt the two tiny dobs together. Repeat on each corner - make sure you are pressing the switch down so they are well attached.
While the switch wasn't an exact match, it was close enough that all four pins had a good connection. Fob worked once again, happy days!
The fob, you can see the four solder points for LOCK and UNLOCK.
Microswitches soldered on, alignment is pretty good, fit is pretty close, most importantly the pinout is the same as the original so it works just fine.
Good luck out there!
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