Mahindra Scorpio M/Hawk . Started with ABS LIGHT STAY ON,Sometimes other warning lights flash on and then off again .Now windscreen washer and aircon not working

If the ABS warning light is staying 'On' you have a possibly serious problem with your Brakes. Get them looked at AS SOON AS YOU CAN!
What are the other warning lights you are getting?
You will need to get the vehicle plugged into a diagnostic system or an obd2 scanner to find out what the code is for the problem. A good mechanic or an Auto electrician can do this for you. A dealership can do this but they are expensive.