If they won't fold out:
Key out of ignition.
Unfold mirrors by hand, they will make a crack noise as the move out.
Mirror knob to top position.
key in ignition, ignition on, but don't start car.
Wait 30 seconds, then turn knob to bottom position. Mirrors will make cracking noises and fold in.
Wait 30 seconds.
Knob back to top, and the mirrors should unfold.
It's detailed in your owners manual.
The major thing is that when the control module in the mirror housing starts to wear out, it become susceptable to the voltage drop when you start the car. So you must unfold the mirrors before starting the car. All will be happy then.
Simon.