Tata Indica Headlight's Low or High beam not working fix

Under desboard driver side fuse box is there.open it change from left side 3rd Relay. i.e low beam relay and 2nd relay is high beam relay for tata Indica any model. if same problem come in Any four wheeler vehicle only find where is headlight relay change it problem is solved . (Suddenly both Headlight's high or low beam not glowing then problem from relay , relay is replaced problem is solved, if high or low beam one bulb is not glowing then problem in its bulb, bulb is replaced with new one problem is solved.)very rarely wiring problem or combination switch problem. Thanks alots give my vedio your precious time.