How can I sort problem with scorpion alarm in mk3 golf?

When activating scorpion alarm in mk3 Golf, orange indicator lights on car flash 3 times.Lights on drivers side stay on after 3rd flash. Only way to extinguish lights is to disconnect battery. Also cannot find scorpion onboard receiver/control unit. Does anyone know where unit is sited or how to cure fault.Fobs have volkswagon label attached but local dealer (who installed system) not very helpful unless they sort fault.