my Prius is playing musical locks on me

I've got 5 doors but when I unlock the doors only 3 will unlock. Every week its a different 3 meaning 2 will not lock or unlock. You never know which 2 will fail as it seems to be a sick game of musical locks that the Prius is playing on me.

its really embarrassing having to go in a rear door and having to reach over the front seat to unlock a front door manually. I don't feel like taking the metal key out of the sks fob and going old school.

one door failing means mechanical (actuator or whatever) but 2 doors failing at random locations has got to be electrical (or am i wrong??)

some other clues:
-sometimes the little lock starts to move but doesn't make the full 90 degree turn to lock or unlock but sometimes it doesn't budge at all.
-I have never experience any other electrical problems including the dreaded intermittent HID lighting problem.

If anyone knows what the problem is and a do-it-yourself way to fix it would be greatly appreciated.

 

thanks so much, most of my trips are under 10 minutes, and with running accessories (I only use the JBL) I do know that means the alternator may not have enough time to charge the battery back up. We had battery problems with our rx330 so I've got a decent Black and Decker microprocessor-controlled starter/Charger, so tomorrow I'll hook it up and put it on a slow 2-amp trickle charge for about 6 hours or so, its computer controlled so it'll shut off by itself once full.

does anyone know if the stock battery is wet/gell, AGM or is it a traditional battery?? that's one of the options on the charger.

here is the report from the Prius Maintenance Mode:
no load on battery: 11.9V (should be 12.4 to 12.8)
load on battery: 11.6-11.7 (should be above 12.0)
charging state: 14.2-14.3 (should be 13.6 to 14.4)
so the battery is definitely a little low (to be taken care of tomorrow) but the charging system is just fine, so why don't the power locks work when the car and ICE are running?? isn't there power aplenty once the car is started???

 

okay I just started to charge the battery under AGM mode, after I took the red plastic cover off the positive terminal, I can see why other members told me to disconnect the negative terminal instead of the positive terminal as there is so much crap connected to the positive side.

I've disconnected the negative lead to the battery and moved it behind some carpeting out of the way and will charge the battery under the lowest (2amp) setting, nothing is disconnected on the positive terminal, someone let me know if this is wrong . . . immediately . . . thanks

 

no, I read in other posts that jump start terminal under the hood is only for jump start & nothing else. If you could charge the prius at the jump start terminal they would have called it an auxiliary positive terminal.

 

well charging is done, using the AGM setting at 2volts, here is the results:
it ran at 2.7 for about twenty minutes
it decreased to 1.9 for another hour or so
it decreased to 1.2 for another hour or so
it then shut off and stated the battery was 'FULL'

new results of the Maintenance Mode report:
no load on battery: 12.2V (should be 12.4 to 12.8)
load on battery: 11.9 (should be above 12.0)
charging state: 14.2 (should be 13.6 to 14.4)

the battery definitely improved after charging but there is no change I needed as the power locks still won't lock or unlock either front door (that's this week, next week it'll be 2 different doors)

What is the next step?? lubricating the locking mechanisms??
we had the same problem in our '92 Camry so Toyota's achilles heel must be power locks.

 

no power locks at all with sks fob or internal switch, and all wiring harnesses are solidly connected, locks can easily turned 90 degrees into lock/unlock position, but to get into the car I have to go into the back seat and reach over (I'm not that tall), I'm probably gonna have to remove the headrest for now.