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Home >> Mercedes Benz >> 2018 >> SLC43 AMG >> Repair and Diagnosis >> Electrical >> Motors, Switches, Relays >> Electrical System, Equipment & Instruments - 172 Chassis - 1 Of 4 >> Basic Knowledge >> Relay Assignment Of Fuse And Relay Box In Left Side Of Engine Compartment - GF54.15-P-1257-03RD

Relay Assignment Of Fuse And Relay Box In Left Side Of Engine Compartment - GF54.15-P-1257-03RD

Model 172.4 

Illustration shows model 172.4 

Fig 1: Left Side Of Engine Compartment Fuse And Relay Box - Model 172.4
G13847564Courtesy of MERCEDES-BENZ USA
Slot Relay Identification
J Circuit 15 relay (N10/1kJ)
K Circuit 15R relay (N10/1kK)
L Reserve 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, 274 or 651.9 as of 01.06.2015 with CODE U77 (BLUETEC (SCR) diesel exhaust treatment): 
Adblue®/secondary air injection relay (N10/1kP)
Q Valid up to 29.02.2016: 
Backup relay (N10/1kΩ)
R Chassis circuit 87 relay (N10/1kR)