Question about Acura MDX

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Hi - I have 1 2008 Acura MDX and suddenly the wipers came on and won't shut off. (Stuck in intermitten mode.) Also the HIGH speed option for the wipers also isn't working - it just stays on standard speed. I checked the fuses but everything there looks good. Any suggestions? Some sites say it might be the relay and some say the wiper switch. How can I tell which one and is it an easy fix? Thanks.

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Front wipers.
they all guess, do you want me to guess, too? surely not.
or test?. we can use a voltmeter to find this.
what we do is look at the schematics at
and its all clear. a simple road map;

Sticking on possibles.
the fuses are underhood. fuse 11 and 31
bad motor , internal keep alive cam switch stuck on,
will cause continuous wiper.s

so will motor colored wires green or blue hot full time
will keep motor going full time (any voltmeter, easy check)
12vdc is bad, 0v good (wipers off)
next and last is that wiper relay in hood fuse box, shorted. (pull it out see if they shut off?)
if the relay is good then its input is wrong. the control block.

the combo switch wipers on , sends a CAN buss digital commands to the MICU control block, this i turn powers up the wiper relay.
the MICU has a diagnostic port,and can be tested at the dealer
or errors.

if the relay coil pins are hot all the time, then the MICU /combo side is failing, if not, the problem is the relay ,if its output is hot all the time.
how is that?

Posted on Dec 22, 2013

  • _-__-___-_
    _-__-___-_ Dec 22, 2013

    sorry , old post



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SOURCE: Windshield Wiper Not Working Properly

Well sure enough all I had to do was replace the circuit board...wish I had done this a couple months was so easy to do and will now be much easier to drive with being able to see clearly again....

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SOURCE: Rear Windshield Wiper Problems

Check the wiper motor connection if its touching anything and loose it will automatically ground out and check at connection make sure you put some gel and then snap it in/ Please rate my response thank you very much

Posted on Jan 31, 2009

  • 156 Answers

SOURCE: 1998 Toyota Camry wipers don't park and only work on low & hi.

Really from experience I will advice you have the wiper motor replaced.

Rate this solution.

Posted on Dec 30, 2009

SOURCE: winshield wiper works on high

This solution applies specifically to a 91 Ranger with delay wipers, but may apply to other years as well:

There is a "cold solder" joint on the wiper control module that should be investigated whenever intermittent wiper issues crop up. I dont have the ability to post a schematic, but it is one of the leads that come off of the main terminal, and is fairly large. The solder around the lead will look dull and will most likely show physical separation from the circuit board itself. Re-solder with a good hot iron and it may well cure what ails ya. Takes 30-45 minutes, depending on how adept you are at worming your way under the dash to retrieve the module. It's to the left of the ashtray about 6 inches.

Posted on Jun 08, 2012

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Just bought a 2003 acura mdx the wipers will not work on auto. I've messed with the speed and nothing. It does stay on if I turn it to 1 or two but as you can imagine this is frustrating Thanks

Check fuse # 11 and #12 in drivers side fuse panel. If ok, possible wiper relay. You can switch relay with another for testing to see if the intermittant will operate. If they do, replace relay. If not, possible switch/wiring/control module problem and further diagnostics will be necessary. Here is a picture of the relay/s. Try switching them.


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