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ABS pump constantly running


DonutHands
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Out of the blue the ABS pump came on and wont stop even when the ignition is off. ABS dash light on as well. Had to pull a fuse to get it to stop. Any ideas? Certain relay or connector that usually goes or needs to be cleaned?

 

I tried searching, but i think ABS is too short of a search term for the forum.

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BR-41 in the '97 manual shows the circuit diagram. Looking at the diagram, it doesn't look like the ABS control unit could cause this problem if it wanted to. Its power supply is switched by the ignition, and its only other possible source of power is through the brake light switch. It controls the motor through a relay (looks like there are two relays in a unit right next to the ABS motor, there's a drawing of that on BR-40), which connects the motor to its own fused line off the battery. I'm guessing you pulled that 30A fuse link to stop the motor. Unplug the relay unit and check for continuity across the contacts of the motor relay. If you've got continuity through the motor relay, the contacts are welded together and the relay is toast.

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