Installed EV mode and it works....but

My experience is that you will only hear three beeps if EV is forced out by a low battery of if you go over 34 mph, or maybe if you press the accelerator too hard. Just turning it off won't get you the beeps.

 

I don't have the Coastal version, but the behavior of mine (which presumably is in the car itself, not the specific mod) is what Cheap describes. In addition, you'll get the 3 beeps if EV is denied when requested: cold ICE, hot battery, >34 MPH, etc.

 

I have the coastal ev mod. My experience with the 3 beeps is as described by cheap (when the computer terminates the mode).

I get no indication when ev is selected other than the display is switched to the energy screen. If already on the energy screen there is no indication at all; that is no beeps if denied or no indication of being accepted.

 

Three beeps indicates the EV DENY condition. This will happen if you try to engage EV and the computer says No, and it will happen if you are in EV and the computer kicks it out of EV.

You can experience this by trying to go into EV when you are going too fast or accelerating at the same time as you try to enter EV; or by stepping hard on the accelerator or exceeding 34 mph while in EV mode.

Going into EV, the MFD will switch to the Energy screen if it is not already there. This will be accompanied by a single beep. But only if you were not already on the Energy screen.

 

As everyone said, the beeps came from Toyota's, not from Costal Dave's.
Anyway, please refer to the EV switch part of the UK manual...
http://priuschat.com/index.php?showtopic=14582&st=1

Ken@Japan