How do you replace hazard switch on 2001 Audi A4?

If you pull the plastic cover off over the triangle for your hazard switch and pull the switch out there is a plug in on the back of the box remove the plug in and you will have the hazard switch out its a small 1X2" box and if your problem is your blinkers or hazards not working you can take apart the box and inside there is a circuit board with two relays one for turn signals the other for hazards. On the a4 b5 the points on these relays corrode and causes there to be no connection. Use a small screw driver to clean the points up it will save you 50 dollars I did it to my 2001 a4 last week and it solved the problem. There's a great DIY on YouTube for this.