Hi again, Don,
I tried to answer you Sat. morning, but my computer was having issues, so I had to shut it down live (improperly) & I lost everything I had typed. I wasn't around at all yesterday, so here I go trying again today.
No, the little "skidding car" symbol has nothing to do with Vehicle Stability Control (VSC). It's a "wheel slip indicator" as noted in section 2-6 (Operation of Instruments and Controls), Pg 140 & 141 of my 2005 owners manual. It will flash & emit an audible beep when a wheel spins on wet, icy, or sandy pavement as the traction control engages cutting power output from the transmission, forcing the wheel(s) to turn slower (to keep traction) until your road speed matches the power requested from your foot position on the "go pedal". ALL Priuses have traction control standard, NOT to improve traction (like the old GM "Posi-traction"), but to protect the electric motor(s) from over-spinning & causing damage to your car's drive system.
The dash display changed between my 2005 & your 2006, so I don't know if the positions of all the indicator lights remained the same or not. In mine, the row of indicator warning lights starts with #1 Check Engine, #2 Brake System warning, #3 ABS, #4 VSC, & #5 is the Wheel Slip warning, so if yours is set up the same & you don't see the VSC light come on between the ABS & the "skidding car" symbol, then you DON'T have VSC. VSC is an option only available in certain higher end option pkg models & Consumer Reports has touted it (sometimes also called ESC in other makes) as the best safety device to come along since ABS brakes & airbags. I think it's going to become mandatory in all cars starting with either the 2011 or 2012 model year. It works along with your ABS brakes & compares the angle your steering wheels are turned to with the angle a body sensor reports that the car is following, & if they are not the same it assumes you are starting to spin out of control & will apply the ABS brakes of the appropriate 1, 2, or 3 wheels to swing the body angle back in line with the steering wheel angle to save your butt. I think the VSC light will also flash & give an audible beep if it has to go to work to save my butt.
As far as your power port under the dash, I would guess either a blown fuse or a disconnected wire. The power port inside the center console/armrest is on a different circuit from the under-dash one. I don't think the fuse for either one is in the fuse/relay box under the hood behind the driver's side headlight. The fuses for those circuits will be in the fuse box under the dash, just above the parking brake foot pedal where the dash has about a 4" long cutout. The label on the lid of it is hard to read while in place & the lid is a little difficult to remove for the 1st few times (it goes back on hard too). To remove the lid, just put a finger on the single tab between the edge of the lid & the cutout opening & pull gently down until it gives. If the circuits are the same between our two years, then you probably have a blown #29 fuse (the function identification is below the numbered fuse position on the grid of the lid label---I think the #23 position is the "pwr outlet" inside the center console).