Relay assignment of the load compartment fuse and relay box - GF54.15-P-1257-08GM

Fig 1: Identifying Load Compartment Fuse And Relay Box

Courtesy of MERCEDES-BENZ USA

Relays	Designation
K	Relay, circuit 15R sockets (with power-down) (F4kK) (power supply of electric seat adjustment)
L	Valid for code (550) Trailer hitch:  Trailer circuit 30X relay (F4kL)
M	Heated rear window relay (F4kM)
N	Circuit 15 relay (F4kN)
O	Fuel pump relay (F4kO)
P	Rear wiper relay (F4kP)
R	Circuit 15R relay (F4kR)
S	Reserve 1 (changer) (F4kS) (power supply for front socket)
T	Reserve 2 (normally open contact) (F4kT) (power supply for center and rear sockets)
U	Valid for code (550) Trailer hitch:  Trailer relay terminal 30 (F4kU)
V	Spare relay 2 (F4kV)