The blink means the cycle did not complete when you moved the top the last time. This can be simply due to letting go of the button before the beep.
Other than that, you either have low fluid or a pump going bad, based on the slow movement.

The tank is on the pump assembly, driver's side wheel well, back by the tail light assembly. Hit the button to put the top up or down, when the big lid raises, let go of the button and you can look down in there.