My car is fitted with a approved car alarm but not m-b, it is made by a company called Ci they no longer make this alarm, it has mercedes-benz on the back and a P.N. Q35006915, it has a 15 pin plug with colour coded wires but nothing to tell you what they do. it will lock/unlock doors but some times will not start engine. the car works fine with the plug disconnected, but I would like to have remote lock/unlock can anyone suggest which wire stops engine from starting or pin-wire info please