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Common problem is that the nut holding the arm on has loosened. Right at the pivot point on the arm is a nut underneath a pop off cover. You should be able to take that off. Tap the arm down far enough to grab the post again and tighten the nut. The only thing that would stand in your way is if the arm connection or the post is stripped in which case you will have to replace the wiper arm, the wiper mechanism, or both.
At the base of the wiper arm there is likely a plastic cover or cap. When you remove that cap or cover there will be a nut that holds the wiper arm to the post. Align the arm back to it's proper position and tighten the nut. Typically they are aeither a 15 mm or 13 mm nut.
if the passanger wiper stopped working AND the drivers side is still working...one of two problems. the easiest is to pop off the black cap at the base of the wiper arm, under it you will find a nut. check to see the nut is tight. turn the wipers on and observe the post that the nut is on, if it is turning, then the nut needs to be tightened or the spline on the post or wiper arm is stripped. If the post is not turning, then most likely an arm on your wiper assembly has come off, remove the wiper arms remove the black plastic cowl and you will find the wiper arm assembly.
good luck. HTH
If the driver's side is working OK then most likely your problem lies with the attachment of the passenger side arm to the transmission. The transmission is the linkage between the wiper motor and the wiper arms. Often the female or socket part of the arm has become stripped due to turning the wipers on whilst they are ice/snow stuck to the windshield. Remove the cap at the base of the arm, often this is already gone. Get a socket wrench and remove the nut which is exposed. Now gently pry the entire arm up and away from the splined stub sticking out, maybe some liquid wrench or WD40 could help here. Do NOT pry against the windshield. Take your removed wiper arm to a salvage or junk yard and have them sell you another just like it but making sure the inside of the stub socket is not already stripped smooth too. Put it on in the reverse order, firmly tightening the nut.
The wiper arm connection at the motor shaft is a soft metal and known to strip out and slip. No problem to replace. Get a new wiper arm before beginning the procedure. Remove the rubber cover at the pivot and remove the nut securing the wiper arm. Pull the stripped wiper arm off and place the new one on in a horizontal and original position. Put the securing nut on and tighten it enough that it won't strip again, replace the rubber cover and done. See, NOOOOOOO problem.
Virtually all wiper arm systems have notches and grooves on the wiper arm and stud to keep them in place and make them move. If you take the arm that doesn't work off, you will probably find it has stripped, it is easy to do because they are only made of "white metal". Also check the head of the stud to see if it is stripped as well. If you are unsure, you can remove the side that works for comparison. The wiper arm and stud are available at the dealer and aren;t that hard to change by yourself. Hope this helps.
some wiper arms fit over a splined pivot post. When you tighten the nut down, the splines cut into the wiper arm thus holding it tight and keeping it from slipping on the post.
You may just need to tighten the wiper arm down r replace the wiper arm. Does it have a cover that you can rotae up and expse the nut?