blunder1956

I am having the dreaded ABS/BAS/ASR lights on all the time, I attempted to find the fault with a DIY decoder but failed as it appears I may have a digital system.I traced the feed wires of the abs pump to the connector on the ASR/PML module (I think they are the right ones) and found the red wire had a high resistance and only showed 10 volts at the pump.I made a temporary lead to the pump fom the module and the pump worked, but does not turn off with the ignition.I cannot find any relays in the fusebox or in the module box to see if one is faulty, so I assume the pump is fed from the ASR/PML module directly and the module is at fault.Any help or ideas or even a circuit diagram would be gratefully appreciated,many thanks:

blunder1956

traced power to pump, found relay, tested relay and thats ok, relay is not being energised when ignition turned on , can anyone help, tried disconnecting battery for 30 mins but fault lights persist.

oldsinner111

what year w140,did you remove fuse box top that hides relays?

blunder1956

It is a 1996 year model and \i found hidden relays under lid, abs relay is ok but not being activated