Could it be a fault with abs ecu earth(which you are supplying an earth through diagnostic connector,pin 4 & 5) if the pulsing comes back when multiscan disconnected. I would expect the light to be on with any scan tool connected to abs system. May be worth trying another scan tool to see if pulsing still disappears.Not sure whether ABS would get an earth common to diagnostic connector though.
Regards,Andrew
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