220 589 00 99 15 Set of adapter cables - WS54.00-P-0050-28B
MODEL 169.0/3, 164.1/8
FG 54/Set B
Use:
Adapter line with MCP9.5 pin contact for checking systems with MCP9.5 contacts, e.g. relay base on models 169, 164
(set = one black piece and one red piece each).

Courtesy of MERCEDES-BENZ USA