there are 3 connectors with the z2.the wire harness you need to be using for the bypass,will have connections for eg: REAR MONITOR OUTUT,WIRED REMOTE INPUT,REAR VIEW IN,REAR VIEW MONITOR OUTPUT AND GUIDE ON. your installer probably misplaced it for you.if you didnt install any rear cams or monitors no need for it.except for Bypass. when you do get 1 if you still dont plan to have any rear cams or monitors.you can remove those wires from the connector.that way you dont need to try and stuff them in dash.just an idea