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  #1  
Old 06-19-2007, 08:43 PM
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Engine cable harness S420 1994

Hi,
Does anyone have the harness wiring diagram of the car S420 1994? Would you please, post or email this to dinh_hai_tran@yahoo.com. I have a very strange problem as I posted earlier on the auxilliary fan on all the time. After I checked the new engine harness which new part number is: 140 540 1132 on the tag and the part number printed on the harness is 000 545 4881. I called MB dealer, the person who answer the phone said the earlier part number (000 ...) is not on his computer anymore. But the point is that... the pin out new part number (140 ...) is not the same as the old one. I traced from old part number from AC temperature sensor to the computer go to pin number 6 (brown) and 7 (blue) while the new harness go to pin 5 (brown) and 31 (red). This makes my fan on all the time. I'm afraid that if I order another one, it will be just the same as the one I installed. Please, if you have this diagram, I would like to test pin to connector before I purchase.
Thank you very much,

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  #3  
Old 06-19-2007, 09:57 PM
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Yes, the last 7 digits of my VIN is A159980. I hope this is enough
Thanks,

Last edited by dinh_hai_tran; 06-20-2007 at 08:02 AM.
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  #4  
Old 06-20-2007, 09:24 PM
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EPC gives 140 540 11 32 as a harness from 1993 for s420.
p/n 000 545 48 81 is for the black connector only, and not for the harness. Did you take this connector apart? How do you know the wire colors on pins in this connector?
Mike
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  #5  
Old 06-20-2007, 09:36 PM
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Yes, I take everything apart... I even want to strip the wire skin to see what's inside the insulation... As I stated the part number 000... that's what I read from the harness... the rubber with MB sign and the number beside that and 140... is what I see from the tag. The tag, I means add on... just like price tag when you buy your jeans...
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  #6  
Old 06-20-2007, 09:46 PM
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You still have the old harness ??
What is the tag # on That?
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  #7  
Old 06-20-2007, 10:20 PM
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I think I know what is a problem: check if connectors for the temperature sensor and right camshaft solenoid are swapped. I think they are almost the same configuration. And wire from pin 5 goes to camshaft connector.
Mike
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  #8  
Old 06-20-2007, 10:29 PM
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That would also explain the 12v at the connector...
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  #9  
Old 06-27-2007, 04:56 PM
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Hi,
I have leaving my car for a mechanic who installed my harness a while ago for 3 days and eventually he gave up and called me in for help. I told him what I found out of course mainly with help from Arthur, and suddenly I remember what Mike said.... and you know what... actually he connected wrong plug by switching camshaft sensor to AC temp. sensor... I tested the voltage... and follow the cable to main computer connector and these wires go to pin 6 and 7 as they should be... Bingo. But now the AC temp. sensor is shorted just because the voltage supply (12V) to the 5 V sensor. I am ordering the sensor now. Of course, I followed Arthur suggestion by using 1K resistor to fool the computer and the fans stop. I learn quite a bit from all of unseen friends/brothers from this forum... I really appreciated
Thank you very much,
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  #10  
Old 06-27-2007, 06:01 PM
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Location: Florida / N.H.
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Amazing mistake..hope the guy makes it right by you.

I am kinda surpised no one spotted the screw-up .
The tip off was the 12v you got at the 5v sensor and a good deduction from Mike..
The Forum Rules !!!!

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