220 589 00 99 39 Adapter cable - WS54.00-P-0050-39B

FG54/Set B 

MODEL 216, 221 

Use: 

8-pin adapter cable for voltage/resistance measurement and for checking signals on front end CAN bus.

Fig 1: Identifying Adapter Cable (220 589 00 99 39)

Courtesy of MERCEDES-BENZ USA