Relay assignment of fuse and relay box in left side of engine compartment - GF54.15-P-1257-03CA

MODEL 207.3/4 

Fig 1: Front SAM Control Unit With Fuse And Relay Module - Model 207.3/4

Courtesy of MERCEDES-BENZ USA

Relay Slot Identification	Designation
J	Circuit 15 relay (N10/1kJ)
K	Circuit 15R relay (N10/1kK)
L	Wiper park position heater relay (N10/1kL)
M	Starter circuit 50 relay (N10/1kM)
N	Engine circuit 87 relay (N10/1kN)
O	Horn relay (N10/1kO)
P	Valid for engine 271, 272, 273:  Secondary air injection relay (N10/1kP)
Q	Valid for code (B03) ECO start/stop function:  Oil cooler fan motor relay (N10/1)
R	Chassis circuit 87 relay (N10/1kR)