hi i have the same problem its all down to a little card under the glovebox
get down have a look you should see a brown plug
a screw at each side
take the screws out and pull the plug down
it will have a creditcard sized thing on the end of it
goto your local scrapyard and ask for one or remove it yourself
shoud cost about a tenner £10
fit it the same way and it shoud work
these tend to be a regular problem in micras as they are placed stupidly
they are right under the demister so when youve got the fan on and its clearing the window all the water drips down onto the card a fries it
firstly it will only work on 234
then 34
then 4
then not at all
hope this was useful
jayjay
November 2006