There is 2 different ABS modules to find out which one you have fitted have a look at the build sticker by the spare wheel. It'll either be 1AS or 1AT. If it has 1AT fitted hill hold and tyre pressure monitoring can be enabled. If you have 1AS then it cant be done without replacing the module.
if you have a look in either the service book or the spare wheel area there will be a white square sticker with a load of random codes on it. that will tell you everything that is fitted to the car. will look like this.....
Have a look at this thread. It has all the P/N you need. The door modules in the thread have a different P/N to yours so you may need to change them. Have you fitted the new mirror switch as well?