WARNING: This page is about a different car, the 2009 Mercedes-Benz E550 and 2008 Mercedes-Benz E550. However, it is still accessible from the selected car via links, so may be relevant.
FG54/Set B
MODEL 164, 169, 171, 203, 211, 219, 251
Use:
Two-pin adapter cable for voltage and resistance measurements and for checking signals at voltage distributor of CAN-C.