Have a five door golf and left rear window will only go up and down on the door switch, not on the switch on the dash.By my awesome powers of deduction this leads me to suspect the dash switch is knackered.Question is are the two rear window switches and isolator button one complete unit thus meaning i need a complete new one or separate?And also how does it come out of the dash as have had majour traumas with trim removal in the past?cheers people