Mercedes-Benz A-class W177 (2018-2023) engine compartment fuse, relay module Wiring diagrams

BLK/RED WIRE BLU WIRE BLU/WHT WIRE BLU/YEL WIRE BRN WIRE COMPUTER DATA LINES SYSTEM COOLANT TEMPERATURE SENSOR COOLANT THERMOSTAT HEATING ELEMENT DRIVETRAIN CONTROL UNIT ENGINE COMPARTMENT FUSE, RELAY MODULE ENGINE COMPARTMENT PREFUSE BOX FAN MOTOR (BEHIND RADIATOR) FINE PARTICLE SENSOR FUSE 103 FUSE 118 FUSE 14 FUSE 143 FUSE 166 FUSE 27 FUSE 41 FUSE 53 FUSE 54 GRN WIRE GRN/VIO WIRE GRN/WHT WIRE GRN/YEL WIRE GRY/BLK WIRE GRY/YEL WIRE HOT AT ALL TIMES HOT W/ HOT W/ BATTERY DISCONNECT SWITCH RELAY ENERGIZED ME-SFI (ME) CONTROL UNIT NCA WIRE POWER SUPPLY POTENTIAL DISTRIBUTOR 3 RED WIRE RED/BLU WIRE RED/GRN WIRE RED/VIO WIRE RELAY ENERGIZED SIG SIG GND VEHICLE INTERIOR FUSE, RELAY MODULE YEL/GRN WIRE

BLK WIRE BLK/WHT WIRE BLU WIRE BLU/BRN WIRE BLU/RED WIRE BLU/YEL WIRE BRN WIRE BRN/BLK WIRE BRN/GRN WIRE BRN/RED WIRE BRN/VIO WIRE BRN/WHT WIRE BRN/YEL WIRE CAN B H CAN B H STERN CAN B L CENTER ENGINE HOOD CONTACT SWITCH CENTRAL CONTROL MODULE CENTRAL LOCKING STATUS DISPLAY COMPUTER DATA LINES SYSTEM DCS DCS (+) DCS GND DRIVER DOOR AMBIANCE ILLUMINATION DRIVER DOOR CENTRAL LOCKING INSIDE DOOR HANDLE SWITCH DRIVER DOOR CONTROL UNIT DRIVER DOOR HANDLE AMBIANCE ILLUMINATION DRIVER DOOR HANDLE ILLUMINATION DRIVER DOOR LOCK DRIVER DOOR POCKET LIGHTING ENGINE COMPARTMENT FUSE, RELAY MODULE FUSE 156 FUSE 21 GRN WIRE GRN/BLU WIRE GRN/RED WIRE GRY/RED WIRE HOT AT ALL TIMES LED LIN LOCK UNLOCK MOT GND/(+) MOT- PNK/BLU WIRE PNK/VIO WIRE PNK/WHT WIRE RED WIRE RED/BLK WIRE RED/GRN WIRE SIG SIG (1) SIG (2) SIG GND TRUNK LID/LIFTGATE EXTERNAL OPERATION BUTTON TRUNK LID/LIFTGATE LOCK TRUNK LID/LIFTGATE UNLOCKING BUTTON VEHICLE INTERIOR FUSE, RELAY MODULE VIO/PNK WIRE W/ INCREASED THEFT PROTECTION WHT/GRN WIRE WHT/VIO WIRE YEL WIRE

BLK WIRE BLK/BLU WIRE BLK/YEL WIRE BRN WIRE COMPARTMENT TERMINAL 15 RELAY ENERGIZED DRIVER-SIDE AIR VENT AMBIANCE ILLUMINATION ENGINE COMPARTMENT FUSE, RELAY MODULE FOOTWELL ILLUMINATION DIODE 1 FOOTWELL ILLUMINATION DIODE 2 FRONT PASSENGER SIDE AIR VENT AMBIANCE ILLUMINATION FUSE 21 FUSE 65 GRN WIRE GRN/YEL WIRE GRY/RED WIRE HOT W/ BATTERY DISCONNECT SWITCH RELAY ENERGIZED HOT W/ ENGINE LEFT FRONT FOOTWELL LAMP LOWER DRIVER-SIDE INSTRUMENT PANEL AMBIANCE ILLUMINATION LOWER PASSENGER-SIDE INSTRUMENT PANEL AMBIANCE ILLUMINATION ORG/BLK WIRE RED WIRE RED/BLK WIRE RED/GRN WIRE RED/GRY WIRE RIGHT FRONT FOOTWELL LAMP UPPER DRIVER-SIDE INSTRUMENT PANEL AMBIANCE ILLUMINATION UPPER PASSENGER-SIDE INSTRUMENT PANEL AMBIANCE ILLUMINATION W/ STYLE PACKAGE YEL WIRE

ADAPTIVE DAMPING SYSTEM CONTROL UNIT BACKUP RELAY BRN WIRE BRN/WHT WIRE CENTER STOP LAMP CIRCUIT 31 POTENTIAL DISTRIBUTOR 1 DRIVE UNIT CONTROL UNIT ENGINE COMPARTMENT FUSE, RELAY MODULE INNER LEFT REAR LAMP UNIT INNER RIGHT REAR LAMP UNIT LEFT FANFARE HORN LEFT LICENSE PLATE LAMP LEFT LOAD COMPARTMENT LAMP LEFT OUTER REAR INTEGRATED RADAR SENSOR LEFT OUTER REAR RADAR SENSOR LEFT REAR LAMP UNIT LEFT REAR PASSENGER COMPARTMENT BACKREST LOCK MICROSWITCH LIFTGATE AMBIENT LAMP, WARNING LAMP LUGGAGE COMPARTMENT SOCKET NCA WIRE REAR AXLE DIFFERENTIAL DRIVE UNIT REAR CAMERA COVER MOTOR REAR WINDOW GLASS BREAKAGE SENSOR RIGHT LICENSE PLATE LAMP RIGHT OUTER REAR INTEGRATED RADAR SENSOR RIGHT OUTER REAR RADAR SENSOR RIGHT REAR PASSENGER COMPARTMENT BACKREST LOCK MICROSWITCH TAILGATE WIPER MOTOR TANK CAP CENTRAL LOCKING ACTUATOR TRAILER HITCH SWITCH TRUNK LID/LIFTGATE EXTERNAL OPERATION BUTTON TRUNK LID/LIFTGATE LOCK W/ INTERIOR MONITORING

ADDITIONAL BATTERY ALL-WHEEL DRIVE CONTROL UNIT BACKUP RELAY BATTERY DISCONNECT SWITCH RELAY BRN WIRE CENTRAL CONTROL MODULE CIRCUIT 50 RELAY DC/AC CONVERTER CONTROL UNIT ENGINE COMPARTMENT FUSE, RELAY MODULE EXHAUST FLAP CONTROLLER FINE PARTICLE SENSOR FRONT CIGARETTE LIGHTER W/ ASHTRAY ILLUMINATION FRONT VEHICLE INTERIOR POWER OUTLET HAND MOTION SENSOR LEFT FRONT LAMP UNIT MONO MULTI-FUNCTION CAMERA NCA WIRE OVERHEAD CONTROL PANEL CONTROL UNIT PANORAMIC SLIDING ROOF CONTROL UNIT RAIN/LIGHT SENSOR W/ ADDITIONAL FUNCTIONS REAR WINDOW HEATER RIGHT REAR LAMP UNIT SOUND SYSTEM AMPLIFIER CONTROL UNIT SPRAY NOZZLE HOSE HEATER STARTER BATTERY PREFUSE BOX STATIONARY HEATER UNIT STEREO MULTI-FUNCTION CAMERA SUBWOOFER AMPLIFIER TRAILER RECOGNITION CONTROL UNIT TRANSMISSION OIL COOLING COOLANT CIRCULATION PUMP TRUNK LID/ LIFTGATE EMERGENCY OPENING BUTTON VOLTAGE DIP LIMITER W/ SMOKER'S PACKAGE W/ SOUND SYSTEM W/O SMOKER'S PACKAGE WIPER MOTOR

BLK WIRE BLK/VIO WIRE BLK/WHT WIRE BLU WIRE BLU/BRN WIRE BRN WIRE BRN/BLK WIRE BRN/RED WIRE BRN/WHT WIRE CAN B H CAN B L CAN B L STERN CENTER CONSOLE CUP HOLDER ILLUMINATION CENTER CONSOLE STOWAGE COMPARTMENT ILLUMINATION CLIMATE CONTROL OPERATING UNIT COMPUTER DATA LINES SYSTEM DRIVER SEAT HEAD RESTRAINT ILLUMINATION ELECTRONIC IGNITION SWITCH CONTROL UNIT ENGINE COMPARTMENT FUSE, RELAY MODULE FRONT PASSENGER DOOR CENTRAL LOCKING INSIDE DOOR HANDLE SWITCH FRONT PASSENGER DOOR CONTROL UNIT FRONT PASSENGER DOOR HANDLE ILLUMINATION FRONT PASSENGER SEAT HEAD RESTRAINT ILLUMINATION FUSE 21 GRN WIRE GRY WIRE GRY/BLK WIRE GRY/BLU WIRE GRY/RED WIRE HOT W/ BATTERY DISCONNECT SWITCH RELAY ENERGIZED ILLU LEFT REAR SEAT HEAD RESTRAINT ILLUMINATION NCA WIRE ORG/ WIRE PASSENGER SIDE OUTSIDE MIRROR PASSENGER-SIDE POWER WINDOW SWITCH PNK WIRE PNK/RED WIRE RED WIRE RED/BLU WIRE RED/YEL WIRE RIGHT REAR DOOR CENTRAL LOCKING INSIDE DOOR HANDLE SWITCH RIGHT REAR DOOR CONTROL UNIT RIGHT REAR DOOR HANDLE ILLUMINATION RIGHT REAR POWER WINDOW SWITCH RIGHT REAR SEAT HEAD RESTRAINT ILLUMINATION SAM CONTROL MODULE (RIGHT FRONT FOOTWELL) SENS GND SIG SIG (1) SIG (2) SIG 3 START/STOP BUTTON VIO WIRE W/O AMBIANCE ILLUMINATION

AUDIO H AUDIO L+ BLK WIRE BLK/WHT WIRE BLK/YEL WIRE BLU WIRE BLU/RED WIRE BLU/YEL WIRE BRN WIRE BRN/BLU WIRE BRN/WHT WIRE CENTER LEFT REAR PARKING SYSTEM DISTANCE SENSOR CENTER RIGHT REAR PARKING SYSTEM DISTANCE SENSOR COMPUTER DATA LINES SYSTEM ELECTRONIC IGNITION SWITCH CONTROL UNIT ENGINE COMPARTMENT FUSE, RELAY MODULE FLEX-E BM FLEX-E BP FUSE 171 FUSE 42 GRN WIRE HOT W/ BATTERY DISCONNECT SWITCH RELAY ENERGIZED INNER LEFT REAR PARKING SYSTEM DISTANCE SENSOR INNER RIGHT REAR PARKING SYSTEM DISTANCE SENSOR OUTER LEFT REAR PARKING SYSTEM DISTANCE SENSOR OUTER RIGHT REAR PARKING SYSTEM DISTANCE SENSOR PARKING SYSTEM CONTROL UNIT PNK WIRE RED WIRE RED/WHT WIRE SIG VEHICLE INTERIOR FUSE, RELAY MODULE WHT/RED WIRE WHT/YEL WIRE YEL/RED WIRE YEL/VIO WIRE YEL/WHT WIRE

BACKUP CAMERA CONTROL UNIT (CENTER OF LIFTGATE) BLU/BLK WIRE BLU/GRN WIRE BLU/GRY WIRE BRN WIRE BRN/RED WIRE CAN B H STERN CAN B L CAN HMI H CAN HMI L CENTRAL CONTROL MODULE COMPUTER DATA LINES SYSTEM ENGINE COMPARTMENT FUSE, RELAY MODULE FUSE 171 FUSE 21 HEAD UNIT HEAD UNIT/ INSTRUMENT CLUSTER CONTROL UNIT HOT W/ BATTERY DISCONNECT SWITCH RELAY ENERGIZED MOT GND/(+) NCA WIRE REAR CAMERA COVER MOTOR RED WIRE RED/WHT WIRE SHIELD SHIELD DISP/RVC SHIELD RVC SIG VEHICLE INTERIOR FUSE, RELAY MODULE VIO WIRE VIO/WHT WIRE W/ CONNECT 20 W/ CONNECT 5

AIR CONDITIONING SYSTEM BLU WIRE BRN WIRE BRN/GRY WIRE ENGINE COMPARTMENT FUSE, RELAY MODULE FUSE 166 FUSE 53 GRN/VIO WIRE GRY/RED WIRE HOT W/ BATTERY DISCONNECT SWITCH RELAY ENERGIZED HOT W/ CIRCUIT NCA WIRE RED/GRN WIRE RED/GRY WIRE SHD SHIELD SIG STATIONARY HEATER FUEL PUMP STATIONARY HEATER RADIO REMOTE CONTROL RECEIVER STATIONARY HEATER SWITCHOVER VALVE STATIONARY HEATER UNIT TELEPHONE ANTENNA SPLITTER VEHICLE INTERIOR FUSE, RELAY MODULE W/O WIRELESS PHONE CHARGING AT FRONT, ANTENNA

BACKUP RELAY BLK WIRE BLK/GRN WIRE BLK/ORG WIRE BLK/RED WIRE BLK/WHT WIRE BLK/YEL WIRE BLU WIRE BRN WIRE BRN/WHT WIRE ENGINE COMPARTMENT FUSE, RELAY MODULE EXHAUST FLAP CONTROLLER FUEL PUMP (FP) (IN FUEL TANK) FUEL TANK DIAGNOSTIC MODULE FUSE 26 FUSE 27 FUSE 28 FUSE 29 FUSE 41 FUSE 43 FUSE 54 FUSE 55 FUSE 56 FUSE 57 FUSE 67 FUSE 69 FUSE 71 GRN/BLK WIRE GRN/BLU WIRE GRN/GRY WIRE GRY/BLU WIRE HOT W/ BATTERY DISCONNECT SWITCH RELAY ENERGIZED HOT W/ ENGINE COMPARTMENT TERMINAL 15 RELAY ENERGIZED LEFT FUEL TANK FUEL LEVEL INDICATOR FILL LEVEL SENSOR NCA WIRE ORG/BLU WIRE RED WIRE RED/BLK WIRE RED/BLU WIRE RED/GRN WIRE RED/GRY WIRE RED/VIO WIRE RED/WHT WIRE RED/YEL WIRE RIGHT FUEL TANK FUEL LEVEL INDICATOR FILL LEVEL SENSOR WHT/BLU WIRE