Here is the tool you can make to get to the other codes.
It shows what pins to plug into your diagnostic socket. [ pin #14 for your AE/CC/ISC module]
This is just a copy of the circuit Benz uses to get to the emmissions module with there built-in led, so the code retrival procedure is the same as the built-in one , except you can now move to the different modules....

http://members.aol.com/ajdalton7/e320led.jpg