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ML500 cooling fan wiring problems

 
Old 02-20-2014, 08:21 AM
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ML500 cooling fan wiring problems

Ive got a ML500 that previous owner installed a aftermarket fan using a toggle switch to turn on (talk about Bush League). Ive since purchased a new OEM fan, but he cut the wiring harness. Could someone enlighten me on the color to pin location of the factory fan. I have loose wires I need to hook up to new fan.
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Old 02-20-2014, 08:22 AM
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FYI 2002 ML500
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Old 02-20-2014, 06:42 PM
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Here is the diagram and legend.

Please note the following:

1. M4/7 is the fan.

2. Blue wire comes from fuse #22 in the fuse box.

3. White wire comes from the ECM.

4. Brown wire comes from ground W2.

5. Red wire comes from special 100 amp fuse at the battery.
Attached Thumbnails ML500 cooling fan wiring problems-2014-02-20_183952.jpg   ML500 cooling fan wiring problems-2014-02-20_183913.jpg  
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Old 02-20-2014, 07:06 PM
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I cant figure out what pin each color goes to on the fan. Example what pin the red wire hooks to ... ect . Ive just got air gaped wires I need to connect to the pins.
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Old 02-20-2014, 07:16 PM
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Post a few photos of the fan control module.
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Old 02-20-2014, 07:35 PM
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not really sure how to, I have one on my desktop. when I hit attach picture it is looking for a URL..
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Old 02-20-2014, 07:37 PM
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im going to try install photobucket in my iphone
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Old 02-20-2014, 07:45 PM
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Old 02-21-2014, 01:51 AM
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Just hang on and I'll see what I can do.
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Old 02-21-2014, 09:52 AM
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I had to ask someone else to take photos and you owe him thanks for providing them.
Attached Thumbnails ML500 cooling fan wiring problems-2014-02-21_082344.jpg   ML500 cooling fan wiring problems-2014-02-21_094907.jpg   ML500 cooling fan wiring problems-2014-02-21_094819.jpg  
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Old 02-22-2014, 12:58 AM
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First I got to say Dundee you have been a tremendous help!
I'll take a closer look at my fan to make sure the + and - for red and black are there. Inside the black plug there are 4 pins, I'll ring them out to see if they can be put in series with the color located just below. If you see my picture there are two big pins and two smaller just above.
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Old 02-22-2014, 01:10 AM
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An OE fan only has two pins. I have no idea why yours has two and two.

Be aware that WHITE wire is a Pulse Width Modulated signal that comes from the ECM and the BLUE wire comes from fuse #22. You must be absolute sure of where those two wires are situated or else you can fry your ECM.
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Old 02-22-2014, 01:50 AM
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The box says VDO, I'm assuming they were a oem for Benz. Makes me feel better knowing I got to get it right 1st time. Dealing with a $800 fan
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Old 02-22-2014, 02:03 AM
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Yes VDO is a supplier for M/B, but where did you get the fan?
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Old 02-22-2014, 02:14 AM
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Amazon
VDO FA70581 Radiator Fan Assembly
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Old 02-22-2014, 04:37 PM
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1990 190E 2.6, ... 1998 ML320, 2005 ML500SE
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Last edited by Mike's ML; 02-22-2014 at 04:45 PM.
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Old 02-23-2014, 08:10 AM
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This thing does not the the lugs for the + and -, appears to have the pins inside the plastic disconnect, that is why I have 4 pins. Im attaching a few better pictures, hopefully someone will recognize this set up..
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Old 02-23-2014, 08:10 AM
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Old 02-23-2014, 08:11 AM
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Old 02-23-2014, 08:11 AM
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Old 02-23-2014, 08:18 AM
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I checker Oreilly auto parts and they show this VDO part number fitting the ML500

http://www.oreillyauto.com/site/c/de...1389&ppt=C0331
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Old 02-23-2014, 01:52 PM
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You do not have the correct fan or this is Thailand's version which is totally wrong.

This is why the M/B version costs $950 and that is why the previous owner went with the toggle switch and then sold the truck.

I cannot offer any other info or suggestions. You are on your own.
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Old 02-23-2014, 04:39 PM
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Update:
Ok guys I decided I was swinging for the fence, I took a guess and hooked it up. Got it right the fan is running! My seat heaters are working and the coolant low light is off! Dundee I greatly appreciate your help and time spent researching, also thank the person how took those pictures for you, I used them to help with my educated guess. I will post the correct pin to color layout on here if anyone else had this issue.
Thanks again everyone
Dave
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Old 02-25-2014, 01:11 AM
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When are you going to post a photo of what you did?
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Old 03-02-2014, 02:07 PM
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Finished Product ML500 cooling fan wiring problems-22e1029f-6de4-4d29-8f24-1a3957243cf4_zps2x59e3rj.jpg
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