When i put in any of the slow modes the wipers do not work, but putting it in fast mode it will work, but it is anoying when it is not raining that hard. what is the problem is it the rain sensor or just mechanical problem.

its the timer that's bad on it ,you,ll have to take it in to the dealer for that one,they will have to replace it,but that's what causes that too happen,it doesn't cost that much though to get it replaced,good luck with it,and merry x-mas.