I've got a Volvo XC90 with an intermittent indicator fault O/S it works sometimes then stops if you pull switch to headlamp flash and hold it works let go and it stops after a few flashes we've changed switch and circuit board behind steering wheel and its looking more like central control unit fault is there anyone can programme in a second hand unit as a new one is £650 or any one know of fix for this problem? any help may be useful. Regards Martin