The rear wiper on my 1999 Ody LX quit working a few weeks ago mid cycle. After quite a battle to get the "special low profile $3 nut" which I believe is 23mm off of the much corroded aluminum shaft (not the 10mm nut on the wiper arm), I basically found the motor was not working because it was overloaded due to a corroded wiper arm shaft. I have experienced this on 1999-2000 VW Golf and Jettas, so I was expecting this. Except it was the front wipers on my VW. It was stall in heavy rains. Definitely a fun thing on the highway to have your wipers quit! -- But only for like 15 seconds. Some kind of protection device would stop the wipers but then they would restart. At least on the Honda it was only the rear wiper!
Once the wiper motor was removed from the car, it was nice to see that the rear plate was removeable on the rear wiper motor asy with phillips screws. A new one is like $115-150 from the dealer. The shaft is removeable after you pull off the white plastic washer, circlip, stainless washer and o-ring from the top area of the shaft. Spinning the wiper arm nut back on the shaft (to protect the threads), you can gently pound the shaft thru the house to scrap, clean and re-lubricate it. The shaft itself was probably like 3" long and about the top 3/4" was corroded and plating was somewhat eroded.
If you have a rear wiper that is acting up and is slowing down, you should do this. Our 99 Ody has 138k on it and the road salt and weather has definitely aggravated the situation.
One of the brushes on my motor was half eaten away, from the stall condition, I am surprised it didn't just blow the fuse. I just rebent the brush hold spring arm and reassembled the motor. I was also pleased to see the motor could be "serviced". I doubt Honda offers parts, but maybe someone does.
Of course, to access the wiper motor you need to remove all of the trim from the tailgate.
The moral of the story is, if your rear wiper is slowing down or hesitating, it's probably worth servicing. Alot of grease on the shaft will go a long way. I noticed originally I could not turn the wiper shaft at all. Now, there is a little bit of free play. Your is probably ok if there is a little bit of slop (free play) when you try to rotate the wiper arm by hand (don't forced it as most of the gearing is plastic).