Prius Key fob faulty Lock/Unlock buttons

Get a replacement case. The rubber membrane is worn out.

I've seen cases on both eBay and Amazon. do not know where I got mine, but it works better than the old one with a missing button...

To open the old case, take out the mechanical key, take out the battery, and split the case by spreading a needle nose plier in the mechanical key opening. The original Gen2 fob is glued together, so you'll have to break it open.

The replacement cases are snap together, similar to Gen3+ cases.

Transfer the circuit board and the transponder chip (1/2" by 1/8" separate chip) from the old case to new. If you don't transfer the transponder, the fob will not work plugged into the dash.

While you've got the case open, may as well replace the battery.

 

Do you have the other key fob?

 

If the buttons are defective, then you may need to purchase a new key fob online and use the "Chicken Dance" to pair it with your car. To use the "Chicken Dance", you need the lock/unlock buttons to be working.

 

If it's just the rubber membrane, the old circuit board should work fine in a new case. No need to do a new chicken dance.

 

Yes, but he said:

 

Real test is to take out the circuit board and see how it works without the old case. Have to hold the battery in place and be sure that the LED flashes when you press the real buttons without the rubber in the way.