Hi, the reason why those lights come on is because of a loss of pressure.It is a very simple wiring system,relay on the pump that are basically controlled by pressure sensors at the valve body of the brake system under the resivor.
Is the pump contuiously running?
I have uploaded the schematic diagrams for the abs system and you can download them by clicking HERE.
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Yes it should be hot all the time.
A,ground,B,computer ground,C,battery fused,D, power distribution center fuse.