Replace all the fuses in the box first. I have seen both High Beams out at the same time.. and the seat adjustment on the passenger side, I don't that it goes through the diode. The diode faulty symptom is the seats don't operate with the door open. Injection nozzles are easy to replace but I do all of them at the same time.
ASE CERTIFIED MASTER AUTO TECHNICIAN
LEAD TECHNICIAN FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM