Hi, I have bought new boot lock for C180 W203 and the new lock has a four pin plug. Old lock had three pin plug with three wires. I wired the 3 wires as they were in the old pin (pin 1,2 3 to pin 1,2,3,4-empty). There is no forth wire to go in the forth pin in the new plug
. Tried but boot release button doesn't work with this configuration. Can anyone please help? Thanks