Schmaltzy ,according to the diagram, the power comes directly form the ABS controller, no relays in between. I believe your module has an internal short to power.
Here is the diagram.
It shows the power in the diagram to the pump on the bottom right.
I can't see any other reason for the pump staying on other than a bad module.
Seen a lot of these trucks in my shop, never an issue like this on a Dodge. But have seen it on a couple of GM pickups.
I hope your repair goes OK.
Thank you for using FixYa
KL