Antilock light most likely is a wheel sensor and/or the wires to them. One on each wheel. The door locks go thru the body control module. Two different systems that don't link, so one cannot cause the other.
Could be a radiator leak, a freeze plug leak, a loose hose clamp. If the freeze plugs leak, replace them all at once, not just the one leaking. All the freeze plugs are the same age, so sooner or later another will leak too