keyless entry

I had the same problem with the occasional 'key detected' signal, but now the car can be locked/unlocked only with the fob. I cannot open or lock the door by the handle or the hatchback handle. If I try to lock the door by holding my hand over the handle, I get the 'long beep' that is supposed to happen when I try to lock the car with the keys inside (or a door ajar, etc.). Any ideas? thanks.

 

test the 12 volt battery health.

 

Keyless entry button under the steering wheel?

 

I'm having the same issue. The keyless entry some times works. Like It may not work in the morning as I get into the car, but then work later when I get to work. My battery voltage is around 13V or so (LifePo4) and my key fobs were tried both using new cells and then after draining the cells to 3V. Some people were saying that the fob voltage sometimes is too high with new cells. Neither fob works now. Its gotten to the point where it sometimes works rather than sometimes doesn't work. When it works, its all normal. When it doesn't work, the car can still be locked from inside using the door buttons or from outside using the mechanical key (which is annoying to use as hell). I opened the driver's side rear panel to see the receiver. I did that because I was getting TPMS errors too but without having a flat tire. Sometimes I drive the kids to school and as soon as the rear driver side door closes I get the long beeps and screen indicating that the key is not detected... Placing the fob near the start button doesn't fix that, so I just drive home with that annoying thing happening in the background. Anyway, I can't find any wiring diagrams out there for the Prius C 2014 so its a little frustrating. I want to know what fuses to check specifically that control that function to see if they are burnt. I checked all the fuses on the little box in side the engine compartment to the left and there is nothing on the right side one. But there is another fuse box that I haven't checked yet in the passenger compartment near the driver's leg.

 

could be a bad ecu or corrosion. you can find the service manual with schematics at techinfo.toyota.com