LEMON Manuals: Even more car manuals for everyone
Home >> Mercedes Benz >> 2021 >> C300 Base, 2D Convertible >> Repair and Diagnosis >> External Pages >> Different car >> Section 5 (Electrical System, Equipment & Instruments - 253 Chassis - 2 Of 7) >> Basic Knowledge >> Assignment Of Engine Fuse And Relay Module >> Assignment Of Engine Fuse And Relay Module - GF54.15-P-1256-32RFN

Assignment Of Engine Fuse And Relay Module - GF54.15-P-1256-32RFN

WARNING: This page does not describe the selected car, but rather 21 other vehicles, including the 2023 Mercedes-Benz GLC43 AMG, 2022 Mercedes-Benz GLC43 AMG, 2021 Mercedes-Benz GLC63 S AMG, 2021 Mercedes-Benz GLC63 AMG, and 2021 Mercedes-Benz GLC43 AMG. However, it is still accessible from the selected car via links, so may be relevant.

Model 253 (except 253.99) 

as of model year 2020 

IMPORTANT Relays J, K, L, M and O are located inside the housing and firmly soldered onto the PCB.

Fig 1: Engine Fuse And Relay Module - Model 253 (except 253.99) As Of Model Year 2020
G12937997Courtesy of MERCEDES-BENZ USA
Slot Fuse Identification Circuit Wire
Identification
Fused component Fuse rating (A)
100 Electrical fuse 100 (K40/8f100) 87 4.0 RDGN With code ME05 (HYBRID DRIVE 80KW VARIANT (INCLUDING PLUG-IN)): 
Vacuum pump (M56)
40
101 Electrical fuse 101 (K40/8f101) 87M 1.5 RDGN Engine 264, 274, 276, 654, 656: 
Circuit 87/2 end sleeve (Z7/48z1)
15
        Engine 177: 
Circuit 87/2 end sleeve (Z7/48z1)
20
102 Electrical fuse 102 (K40/8f102) 87M 4.0 RDBU Engine 654, 656: 
Connector sleeve, circuit 87/1 (Z7/47z1)
20
        Engine 177: 
Connector sleeve, circuit 87/3 (Z7/75z1)
25
103 Electrical fuse 103 (K40/8f103) 87M 1.5 RDGY Engine 264, 274, 276, 654, 656: 
Connector sleeve, circuit 87/4 (Z7/73z1)
15
      2.5 RDGY Engine 177: 
Connector sleeve, circuit 87/4 (Z7/73z1)
20
104 Electrical fuse 104 (K40/8f104) 87M 4.0 RDYE Engine 264, 274, 276, 654, 656: 
Connector sleeve, circuit 87/3 (Z7/75z1)
15
105 Electrical fuse 105 (K40/8f105) 87 - Spare -
106 Electrical fuse 106 (K40/8f106) 87 - Spare -
107 Electrical fuse 107 (K40/8f107) 87 6.0 RD Engine 274: 
Electric coolant pump (M75/11)
60
108 Electrical fuse 108 (K40/8f108) 15M - Spare -
109 Electrical fuse 109 (K40/8f109) 15M 0.35 RDGN With code B53 (Acoustic ambient protection): 
Rear sound generator (H4/135)
5
110 Electrical fuse 110 (K40/8f110) 30t 1.5 RDYE With CODE 631 (Static left-hand traffic LED headlamp) or CODE 632 (Static right-hand traffic LED headlamp): 
Right front lamp unit (E2)
20
      2.5 RDYE With CODE 640 (High Performance LED) or CODE 641 (Dynamic left-hand traffic LED headlamp) or CODE 642 (Dynamic right-hand traffic LED headlamp)): 
Left front lamp unit (E1) Right front lamp unit (E2)
 
111 Electrical fuse 111 (K40/8f111) 30t 1.5 RDBU With CODE 631 (Static left-hand traffic LED headlamp) or CODE 632 (Static right-hand traffic LED headlamp): 
Left front lamp unit (E1)
20
      2.5 RDBU With CODE 640 (High Performance LED) or CODE 641 (Dynamic left-hand traffic LED headlamp) or CODE 642 (Dynamic right-hand traffic LED headlamp)): 
Left front lamp unit (E1) Right front lamp unit (E2)
 
112 Electrical fuse 112 (K40/8f112) 30t 2.5 RDBK Wiper motor (M6/1) 30
113 Electrical fuse 113 (K40/8f113) 50 2.5 VTWH Except code B01 (48V technology): 
Starter (M1)
30
114 Electrical fuse 114 (K40/8f114) 87 4.0 RDWH With code 489 (AIR BODY CONTROL): 
AIR BODY CONTROL compressor (A9/1)
40
115 Electrical fuse 115 (K40/8f115) 87 - Spare -
116 Electrical fuse 116 (K40/8f116) 87 0.5 OGRD With code ME05 (HYBRID DRIVE 80KW VARIANT (INCLUDING PLUG-IN)): 
Electronic Stability Program control unit (N30/4)
7, 5
117 Electrical fuse 117 (K40/8f117) 30t - Spare -
118 Electrical fuse 118 (K40/8f118) 87C 1.0 PKWH Low-temperature circuit circulation pump 1 (M43/6) 15
119 Electrical fuse 119 (K40/8f119) 87C 0.5 RDGN Powertrain control unit (N127) 5
      1.0 RDGN Circuit 87/C1 end sleeve (Z141/1z1) 15
120 Electrical fuse 120 (K40/8f120) 30t - Spare -
121 Electrical fuse 121 (K40/8f121) 15M 0.75 RD Park pawl capacitor (C8) 10
122 Electrical fuse 122 (K40/8f122) 15M 0.5 PKRD Engine 276 with code M016 (Engine, boosted high performance) or engine 177: 
All-wheel drive control unit (N45)
5
123 Electrical fuse 123 (K40/8f123) 15M 0.5 BKRD Front SAM control unit (N10/6) 5
124 Electrical fuse 124 (K40/8f124) 30t - Spare -
125 Electrical fuse 125 (K40/8f125) 15M 0.5 PKRD Powertrain control unit (N127) 5
126 Electrical fuse 126 (K40/8f126) 15M 0.5 PKRD Left front lamp unit (E1) Right front lamp unit (E2) Exterior lights switch (S1) 5
127 Electrical fuse 127 (K40/8f127) 50 0.35 VTWH Except code ME05 (HYBRID DRIVE 80KW VARIANT (INCLUDING PLUG-IN)) and except code B01 (48V technology): 
Voltage dip limiter (R62)
5
128 Electrical fuse 128 (K40/8f128) 15M 0.5 OGBU Electronic Stability Program control unit (N30/4) 5
129 Electrical fuse 129 (K40/8f129) 15M - Spare -
130 Electrical fuse 130 (K40/8f130) 15M - Spare -
132 Electrical fuse 132 (K40/8f132) 87 0.5 OG With code 489 (AIR BODY CONTROL): 
AIR BODY CONTROL control unit (N51/3)
5
133 Electrical fuse 133 (K40/8f133) 30t - Spare -
Relay Identification Designation
G Engine compartment circuit 15 relay (K40/8kG)
H Except code B01 (48V technology): 
Starter circuit 50 relay (K40/8kH)
I With code ME05 (HYBRID DRIVE 80KW VARIANT (INCLUDING PLUG-IN)): 
Vacuum pump relay (+) (K40/8kI)
J CPC relay (K40/8kJ)
K Oil pump relay (K40/8kK)
L Horn relay (K40/8kL)
M Wiper park position heater relay (K40/8kM)
N Circuit 87M relay (K40/8kN)
P Engine 274: 
Coolant pump relay (K40/8kP)
Q With code ME05 (HYBRID DRIVE 80KW VARIANT (INCLUDING PLUG-IN)): 
Relay Q (K40/8kQ)
R With code 489 (AIR BODY CONTROL): 
Relay R (K40/8kR)