Dash with no display Renault scenic 58 plate diesil ?

Hey guys I have a customers car that has no dash display when opening the door upon inspection all the fuses are fine with no breaks. I have tested wires for resistance and get resistance in the section of loom I believe is causing the problem ( from ECU to Fuse box ) (Engine bay) I have had the vehicle working twice now from wiggling that section of loom I suspected. im not a highly experienced machanic but know enough to be able to do most work on customers vehicles I suspect it could be a faulty Fuse box if anyone has come across this problem before and could shed some light on the situation I would be greatful.