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Posted by Elmo P. Shagnasty on February 15, 2010, 6:21 pm

I was speaking hypothetically.  However, "starting" the Prius doesn't
engage a starter motor; the only thing to "start" is the computer.  It
needs to come up to a Ready state, at which point it opens the relays
and allows the drive system to operate.  The drive system includes the
big traction battery.

So, there's no large power source needed to turn the starter motor.  
Turning the computer on and opening the relays requires about as much
electricity as a potato generates, really.  Just about any 12v source
can make that happen.

And once it happens, the drive system can charge the car's 12v battery
back up--just like any other car's drive system can.

A little tiny bit of 12v power can go a long way.

Posted by Hal on February 16, 2010, 3:14 pm

On Mon, 15 Feb 2010 13:21:40 -0500, "Elmo P. Shagnasty"

Thanks for explaining!    I'm hoping I won't have to leave mine sit
idle long enough for it to die.   However a couple posts here about
needing a jump on older models, did make me wonder.


Posted by TKM on February 16, 2010, 1:24 pm

Clever, but it makes sense.  Relays don't take much power.  Any idea of what
the voltage has to be?  A 2-cell flashlight is only 3 volts and the Prius
battery is 12 volts.


Posted by Al Falfa on February 16, 2010, 3:50 pm

Posted by Al Sherman on February 15, 2010, 2:22 am

Page 44 of my 2008 Owner's manual says:

Battery saving function

...  the entry function is disabled in order to prevent the vehicle and
electronic key batteries from discharging when the entry function has not
been used for 2 weeks or more.

I'm not sure if this addresses the same function as the "cancel switch"
under the steering wheel.   When was this feature added? I have not seen any
discussion of it.

Does this mean it is not necessary to turn off remote entry?


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