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#1
03-26-2007, 11:58 AM
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VSS (vehicle speed sensor) on a W124
Could anyone provide some assistance as to where the VSS (vehicle speed sensor) wire(s) on a late-model W124 can be found? I have a '95 E300 Diesel and would like to install a device that needs this signal to function. The owner's manual of the device says some cars actually have two VSS senders -- a low speed and a high speed. Any tips on where to locate these would be greatly appreciated. Thx.
-Frank 
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#2
03-26-2007, 12:05 PM
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That car has 4 VSS's.
ONE for the speedo & 3 for the ABS traction system. all are A/C generators. The speedo sensor may be a hall-effect....ie on/off/on/off
__________________
MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator Last edited by mbdoc; 03-26-2007 at 02:19 PM.
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#4
03-26-2007, 12:57 PM
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Inductive sensor that generates AC current.
The speedo would be the closest.
__________________
MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator
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#5
03-26-2007, 12:58 PM
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Incidentally I work in highway design and the device I would really like to install (and in fact already own) is a DMI or Distance Measuring Instrument:
http://www.jamartech.com/files/RAC_Plus_I_II_Manual.pdf
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#6
03-26-2007, 01:01 PM
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>>The speedo would be the closest.
Thx. I actually have instrument cluster removal tools from when I had a '93 W201. I don't have the car at the moment, but when I get to it and pull out the cluster, could you give me some description of what wire on the back of the speedo is the "target"?  If you could describe it either by color, location, or some other identifier, that would be great. I recently bought the "W124 Owners Bible" and was surprised there was no mention of it in there.
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#7
03-26-2007, 01:04 PM
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I think they generate a current induced by the spining of whatever rotating piece of steel (wheel hub or driveshaft) they are positioned to monitor.
If you are looking to get speed based volume control... there may be a signal to the cruse control that would work best... unfortunatly I do not know what wire and where you could tap it...
__________________
-Marty 1986 300E 220,000 miles+ transmission impossible (Now waiting under a bridge in order to become one) Reading your M103 duty cycle: http://www.peachparts.com/shopforum/showpost.php?p=831799&postcount=13 http://www.peachparts.com/shopforum/showpost.php?p=831807&postcount=14
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#8
03-26-2007, 01:34 PM
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...I thought the spedo was mechanical...
__________________
-Marty 1986 300E 220,000 miles+ transmission impossible (Now waiting under a bridge in order to become one) Reading your M103 duty cycle: http://www.peachparts.com/shopforum/showpost.php?p=831799&postcount=13 http://www.peachparts.com/shopforum/showpost.php?p=831807&postcount=14
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