I can only tell you that in US models this function is controlled by a circuit in the MICU (multiplex integrated control unit), which is built into the under-dash fuse panel. There is no separate turn signal relay. My US factory service manual has wiring diagrams and a fairly extensive troubleshooting section on it. It does say that prior to testing MICU functions, you should check the #10 fuse in the under-hood fuse panel and replace if blown. Hope this helps.