abs motor stays on constantly with key off position
disconnect batteries unplug each sensor indivually check magnets with omhs meter
Hello my name is XXXXX XXXXX X will try to assist you. Can you tell the make and year of the vehicle you are working on?
I believe that year NPR uses a MeritorWabco ABS system. It uses a pump relay to control the pump. The pump relay will always have battery power at pin 30. The relay receives a signal from the ABS ECU to turn the pump on. I think you have a relay with points fused together. Find the relay and remove it and see if the pump stops running. I don not know where the relay is on that vehicle.
Recently retired District Service Manager for major supplier of HD drivetrain & brakes.
removing every relay one at a time, did not shut off the pump. there is a 60 amp fuse that shuts off the pump.
If you are pulling the fuse you are cutting power to the relay. Does the pump unit look like this41036.8592211806
no plug comes in from side
Does it have the ECO built into the top?
OK. Does it look like the attached picture and Is it mounted on the frame rail.