If u try reversing the blue & green wires & it still blows a fuse,then the 2 control units are not compatible & cannot work in parallel,the original unit must be holding a ground on one of the motor wires while your tryin to operate the remote unit.

Make it all a lot easier for yourself & just take the original control unit out & just put the new control unit in by itself.

Do u have a door switch inside the car that opens & closes all the doors or do u do that by just operating the drivers door lock switch?