Soundoff Signal ENGLMMD004 Blueprint Link® Micro Module For Gm 1 WireSoundoff Signal ENGLMMD004 Features When used with the bluePRINT central controller, the bluePRINT Link module allows access to a variety of the vehicles data parameters By incorporating the bluePRINT Link module into the vehicle, the need to splice into discrete wire triggers can be greatly reduced. Not only does this reduce the time required to install a bluePRINT system into a vehicle, it also increases system reliability due to issues when wiring