Do a search on shuttle valve I have fixed two modulators with the shuttle valve fault I bought the kit from British4wd they advertise on this site the kit cost around $110 the part # is SW0500030.
here is a couple of links to check out
shuttle valve switch has arrived
There is a couple of links on the test prodcedures in the top link.
The second modulator I did the switch was faulty water had got in and corroded the switch contacts here is the link for that one below.
another abs modulator fault found
pins 6 and nine are the pins to put the multimeter on to see if it is open circuit but remember that with this fault the lights will stay on even if the fault is intermittent


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