ABS light on checked every thing I could
 

I used the wiring diagrams and checked to make sure module was getting voltage from all sources,all sensors okay,pump unit has power and pump will run if you ground signal wire that comes from controler that is supose to turn on relay.Is there a way to have the module checked to make sure it is bad it sure seems like it is.

FRONT WHEEL SENSORS.

The leads break down and fail over time from a myriad of use and abuse issues, but sooner or later they fail and wink, ABS light. I've even had them kinked or pinched too sharply after maintenance and the light's on, then straightened them out and massaged them a bit again everything was fine. That was when the wires were still young. Age eventually kills them.

Check the OVP fuse..


http://catalog.eautopartscatalog.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=1M30LAGSC1OX18KDC1&year=1987&make=MB&model=300-SDL-001&category=P&part=Overload+Relay

Merry Christmas to all!
banshee350 is the ABS light remaining on from ignition to starting or going off when started and then coming back on once the vehicle has attained ~10mph?

My ABS light was on until I replaced the the fuse. I would check that first before you do anything. I don't know where yours would be, but mine was right behind the battery (I have a 190E 2.3L).

Andrew

I checked all the sensors at the controler there is a ohm reading all sources of power are there the one from the ovp the alt proveing the constant power on ect. the light stays on all the time, the controler must send a ground to the pump relay to pull it in that turns the light signal off from the pump the diagram does not show any internals of the controler but it also is sending a signal for the light to be on.