Temporary lack of power steering, abs, fan, airbags!!

[the other hand]

Happened today for the first time, 2007 model yr. manual yaris hatch.

Started the car, no problem had to rock it out of the snow. Everything working fine, drove 5km to grocery store.

Start car to return home, no power steering, then I notice all the warning lights are on, airbag, abs etc.

Continue driving home and suddenly I have my power steering back, this is when I realize the the fan has also come back on. All other warning lights go out except for the airbags.

I was reading various postings about people having ongoing problems with their abs (various sensors continually needing replacement) such as here
http://www.yarisworld.com/forums/showthread.php?t=11533.

I have not been able to find any info regarding what I experienced. Can anyone point me to a possible explanation.

Thanks for your time