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Un-Synchronised wipers, an odd experience. |
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David_R
 
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 Member No: #5956
Location: In a puddle of LHS |
I've had a read-through of various other wiper-related shenannigans on the site, and do at least now have some understanding of how the system works. The symptoms I'm having seem to revolve around (pun fully intended) the LH (and I assume slave) motor and arm. When the system is turned on from fully off, it completes one wipe correctly, and stops at the "raised" stop position. On the second wipe, while coming back down the screen, it shoots down far too quickly, and smacks into the scuttle really very hard. Once it's done this, the system appears to ignore the LH wiper for one or two cycles of the RH (driver's) motor, which operates correctly. The system then appears to re-calibrate itself as the driver's wiper then parks all the way down, and the cycle re-starts. This works whether the wipers are on intermittent, automatic or first speed. On occasion, they will also both stop at the top of the screen for about 2 seconds, and then fold correctly. Sometimes this will induce the LH arm to smash into the scuttle, but usually it moves correctly for that one cycle. On very rare occasions, the LH wiper remains vertical while the RH wiper wipes correctly for a couple of cycles, before they both pause and then fold correctly. ... and sometimes when this happens, one arm goes up at the same time as one going down and they clash really badly in the middle of the screen. This has happened at least three/four times now, and twice they have locked themselves up at the bottom of the screen, requiring me to pull over and un-knot them from each other. I've found that if you ask it to do one wipe, then turn off (and fully park again) then the next wipe works properly. If you just keep asking for a single wipe and park each time, they function 99% of the time correctly. But that's no good in a torrential downpour on the motorway... I'm assuming this is probably an encoder losing track of where the arm is, but can't be sure if the issue is the slave (I assume LH) motor not knowing where it is, or the master (I assume RH) motor not instructing properly, or indeed not knowing where it is, so can't instruct the slave motor where it should be. I am tempted to just swap out both motors for known good ones, but I would rather see if I can work out what's actually wrong and only fix the bits that really need fixing. Also, are the motors coded to the vehicle? Cheers! |
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C6Dave
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    Member No: #1
Location: Northumberland |
Have a look at this thread: - Click Here - | ||
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MGmike
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  Member No: #3151
Location: South Queensferry |
David_R wrote ... I am tempted to just swap out both motors for known good ones, but I would rather see if I can work out what's actually wrong and only fix the bits that really need fixing. Also, are the motors coded to the vehicle? Cheers! I'm fairly sure it'll be the LH one. Not coded. |
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David_R
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Member No: #5956
Location: In a puddle of LHS |
MGmike wrote ... David_R wrote ... I am tempted to just swap out both motors for known good ones, but I would rather see if I can work out what's actually wrong and only fix the bits that really need fixing. Also, are the motors coded to the vehicle? Cheers! I'm fairly sure it'll be the LH one. Not coded. Many thanks for that. On a journey today the LH motor has completely stopped, meaning I have only the driver-side wiper. Not awful to drive with, but clearly needs sorting. I shall get hold of a s/h nearside motor and see what happens! |
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David_R
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Member No: #5956
Location: In a puddle of LHS |
Latest shenannigans with the wipers... after the LH motor stopped completely, I had the arm off, removed the plastics and gave it a shove while it was suppsed to be on. And it burst back into life. Let it run for a bit with no arm on, put everything back together, and it appears to be behaving itself. ... for the moment! Does anyone know how the position encoder works or what technology it is? I'm wondering if it's a resistive track that has gotten "noisy" hence some use has made it work a bit better. |
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David_R
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Member No: #5956
Location: In a puddle of LHS |
Follow-up on this issue. Bought a replacement second-hand L/H motor (passenger side UK) and fitted it. And it worked immediately. I plan to pull the old motor apart at some point to understand better how it works, but for the moment, working wipers, which is excellent news! |
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Tjensen
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 Member No: #954
Location: Bergen |
I had the same problem, passenger side stopping and/or behaving bad, also colliding with the other and destroying it. Bought 2 new motors and it became better for a while, bot not good. Gradually problems appeared with larger intervals and now it is down to 4-5 times/year. Can live with that. But have not found the exact cause of the problem ! | ||
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