M-Class (W164) Produced 2006-2011: ML280CDI, ML320CDI, ML420CDI, ML350, ML500, ML550

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Old Oct 4, 2018 | 02:43 PM
  #1  
broncoupe's Avatar
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W164 ML320
wipers

Hi have a 2007 ML the front wipers don't operate
But if you turn them on and pull the wiper arms to work you can move them through a sweep
if you turn wiper stalk off they will not move which is write
I tried to read codes with some software but it can only access the engine and stability system all other systems wont communicate with it
Could this be a fault with the front SAM unit
indicators electric windows all work fine
thanks
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Old Oct 5, 2018 | 01:33 AM
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If you can move the wiper arms by hand, then the wiper transmission is faulty. See if anything popped off.
Attached Files
File Type: pdf
R&I Wiper System #1.pdf (100.4 KB, 194 views)
File Type: pdf
R&I Wiper System #2.pdf (80.9 KB, 129 views)
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Old Oct 5, 2018 | 06:17 AM
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Originally Posted by Maj. Dundee
If you can move the wiper arms by hand, then the wiper transmission is faulty. See if anything popped off.
I removed the motor and it’s free put motor back on
turned wipers ON they didb1 cycle perfect then nothing
I am thinking either power issue hence why I could move them by hand when turned ON as if not enough power to push motor
could it be a SAM or relay problem ??
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Old Oct 6, 2018 | 08:35 AM
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Under no circumstances should you be able to manually move the wiper arms, so it is not a power issue. It is the wiper motor or the transmission arms that get attached to it.
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Old Oct 6, 2018 | 09:04 AM
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I really don't want to disagree with you because I need your help
please think of it this way if you have a slow electric window you can help it up or down with your hands if someone presses the window button
this is the same but its a wiper motor its as if its seized but its not it just needs a kick ie a pull to work through its sweep
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Old Oct 7, 2018 | 11:18 AM
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Originally Posted by broncoupe
I really don't want to disagree with you because I need your help
please think of it this way if you have a slow electric window you can help it up or down with your hands if someone presses the window button
this is the same but its a wiper motor its as if its seized but its not it just needs a kick ie a pull to work through its sweep
Yes I agree. That is why I said it could be the motor.
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Old Oct 7, 2018 | 11:30 AM
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I agree the motor
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Old Oct 7, 2018 | 12:09 PM
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Originally Posted by Maj. Dundee
Yes I agree. That is why I said it could be the motor.
will get another motor
do they need coding or any setting up to the front SAM
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Old Oct 7, 2018 | 12:32 PM
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Originally Posted by broncoupe

will get another motor
do they need coding or any setting up to the front SAM
No, it is not included in the instructions.
Attached Files
File Type: pdf
R&I Wiprer Motor Front.PDF (51.4 KB, 123 views)
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Old Oct 8, 2018 | 02:13 PM
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Even odder took battery earth off just to let everything settle
reconnected the battery turned ignition On
turned wipers to 1st position they did 2 complete wipes with a small delay then nothing
Checked motor its not hot this must be electrical not mechanical
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Old Oct 8, 2018 | 02:33 PM
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Do you know where front SAM is its not by the battery under drivers seat
There is a unit there but it just has a few fuses I thought front and rear SAM units looked similar
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Old Oct 9, 2018 | 02:07 AM
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tried another motor that doesn't work at all
the SAM unit was next too the battery under a curved plastic cover that is also bone dry
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Old Oct 9, 2018 | 02:43 AM
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giving up taking it to an indie today
will post what they find to help others
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Old Oct 9, 2018 | 10:19 AM
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Originally Posted by broncoupe
Do you know where front SAM is its not by the battery under drivers seat
There is a unit there but it just has a few fuses I thought front and rear SAM units looked similar




It's right next to the battery.
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Old Oct 10, 2018 | 07:23 AM
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2 yellow relays replaced in engine bay fuse box
all good now
thanks for info hope this helps another member
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