Both cars do have the pulse code readouts. You should buy the CD roms from the partshop to be able to look at which pins to use and what the code means. To get the code you should ground the pin for 3 seconds and no longer than 5. Then it will send back a ground signal in square wave form. Or pulses.
They are both located close to the battery under the hood.

------------------
Benzmac:
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM