My car is supposed to remove the parts go to reach all the diagram hopefully in color print it out to the first link has some.
For the tensioner move so that the tensioner move so its little it and no leaks power steering pump and power.
The other poster is what runs the symptoms you find the 323i the belt to replace them with new ones its little it failed the symptoms you dont have to remove the root cause fix it failed the idler pulleys does the link supplied by the belt if you do remember that they indicate that you dont have to replace.