Mercedes-Benz A-class W177 (2018-2023) sig 3 Wiring diagrams

BLK WIRE BLK/BLU WIRE BLK/RED WIRE BLK/VIO WIRE BLU WIRE BLU/BLK WIRE BLU/BRN WIRE BLU/YEL WIRE BRAKE FLUID LEVEL SWITCH BRN WIRE BRN/BLK WIRE BRN/WHT WIRE BRN/YEL WIRE CAN H H CAN H L CENTRAL CONTROL MODULE COMPUTER DATA LINES SYSTEM ELECTRONIC STABILITY PROGRAM CONTROL UNIT ENGINE COMPARTMENT FUSE, RELAY MODULE EXTERIOR LIGHTS, ELECTRIC PARKING BRAKE SWITCH GROUP FLEX-E BM FLEX-E BP FUSE 23 FUSE 24 FUSE 65 FUSE 72 GRN WIRE GRN/BLK WIRE GRN/BLU WIRE GRN/WHT WIRE GRN/YEL WIRE GRY WIRE GRY/BLU WIRE GRY/WHT WIRE HOT W/ BATTERY DISCONNECT SWITCH RELAY ENERGIZED MOT GND/(+) MOT GND/(+) 31 PNK WIRE PNK/GRN WIRE PNK/RED WIRE RED/BLK WIRE RED/BLU WIRE RED/YEL WIRE RIGHT FRONT BRAKE WEAR SENSOR SIG SIG (+) 52 SIG (1) SIG (2) SIG 3 SIG 4 SIG GND VIO WIRE W/ ENGINE COMPARTMENT TERMINAL 15 RELAY ENERGIZED WHT WIRE WHT/YEL WIRE YEL WIRE

58 D AIR CONDITIONING SYSTEM ANTI-LOCK BRAKES SYSTEM BLK WIRE BLK/BLU WIRE BLK/ORG WIRE BLK/RED WIRE BLK/WHT WIRE BLK/YEL WIRE BLU WIRE BLU/BLK WIRE BLU/BRN WIRE BLU/GRN WIRE BLU/WHT WIRE BRN WIRE BRN/GRN WIRE BRN/RED WIRE BRN/VIO WIRE BRN/WHT WIRE BRN/YEL WIRE CENTRAL CONTROL MODULE CLUTCH COMPUTER DATA LINES SYSTEM CRUISE CONTROL SYSTEM DOOR LOCKS SYSTEM, ANTI-THEFT SYSTEMS DTRL ENGINE COMPARTMENT FUSE, RELAY MODULE ENGINE CONTROLS SYSTEM FUSE 21 FUSE 40 FUSE 42 FUSE 68 GND KLA GRN WIRE GRN/BLU WIRE GRN/BRN WIRE GRN/VIO WIRE GRN/YEL WIRE GRY WIRE GRY/BLK WIRE GRY/BLU WIRE GRY/GRN WIRE GRY/ORG WIRE GRY/RED WIRE HAZARD SIG HB (+) HEADLIGHTS SYSTEM HEADLIGHTS, EXTERIOR LIGHTS SYSTEMS HORNS SYSTEM HOT W/ BATTERY DISCONNECT SWITCH RELAY ENERGIZED HOT W/ ENGINE COMPARTMENT 15 RELAY ENERGIZED HOT W/ TERMINAL ILLU INSTRUMENT CLUSTER SYSTEM LB (+) MOT GND/(+) MOT GND/(+) HAZARD SIG NCA WIRE ORG/ WIRE PNK WIRE PNK/RED WIRE POWER DISTRIBUTION SYSTEM RED WIRE RED/BLU WIRE RED/PNK WIRE RED/VIO WIRE RED/YEL WIRE RELAY ENERGIZED SIG SIG (1) SIG (2) SIG 3 SML STARTING/CHARGING SYSTEM TSI-L (+) TSIR (+) VALVE GND VIO WIRE VIO/BLK WIRE WHT/BLU WIRE WIPER/WASHER SYSTEM YEL WIRE YEL/GRY WIRE

BL/TSI (+) BLK WIRE BLK/RED WIRE BLK/VIO WIRE BLU WIRE BLU/BRN WIRE BRN WIRE BRN/RED WIRE CAN PER H CAN PER L CAN-B_H STERN CAN-B_L CENTER STOP LAMP COMPUTER DATA LINES SYSTEM ENGINE COMPARTMENT FUSE, RELAY MODULE FUSE 21 FUSE 22 FUSE 24 FUSE 48 GRN WIRE GRN/BLU WIRE GRN/VIO WIRE GRN/WHT WIRE GRY/BLU WIRE GRY/BRN WIRE GRY/WHT WIRE HAZARD SIG HOT W/ BATTERY DISCONNECT SWITCH RELAY ENERGIZED L/PL/SML (+) DIAG LEFT FRONT LAMP UNIT LEFT LICENSE PLATE LAMP NCA WIRE PNK WIRE PNK/RED WIRE POWER DISTRIBUTION SYSTEM RED WIRE RED/BLK WIRE RED/BLU WIRE RED/YEL WIRE RFL (+) RIGHT FRONT LAMP UNIT RIGHT LICENSE PLATE LAMP SAM CONTROL UNIT (RIGHT FRONT FOOTWELL) SIG SIG (1) SIG (2) SIG 3 TL (+) TL/PL/SML (+) DIAG VIO WIRE VIO/BLK WIRE VIO/GRN WIRE W/ DYNAMIC LED HEADLAMPS W/ STATIC LED HEADLAMPS YEL/WHT WIRE

BACKUP LAMPS CIRCUIT BLK WIRE BLK/RED WIRE BLK/VIO WIRE BLU/BRN WIRE BRN WIRE CAN H H CAN H L CAN HMI H CAN HMI L CAN LR H CAN LR L CLIMATE CONTROL OPERATING UNIT COMPUTER DATA LINES SYSTEM ELECTRONIC STABILITY PROGRAM CONTROL UNIT EXTERIOR LIGHTS, ELECTRIC PARKING BRAKE SWITCH GROUP GRN WIRE GRN/BLK WIRE GRN/BLU WIRE GRN/VIO WIRE GRN/WHT WIRE GRN/YEL WIRE GRY WIRE GRY/BLU WIRE GRY/BRN WIRE GRY/WHT WIRE INNER LEFT REAR LAMP UNIT INNER RIGHT REAR LAMP UNIT INSTRUMENT CLUSTER CONTROL UNIT LEFT REAR LAMP UNIT NCA WIRE PNK WIRE PNK/RED WIRE RED/BLK WIRE RIGHT REAR LAMP UNIT SIG SIG (1) SIG (2) SIG 3 SIG 4 STEERING COLUMN MODULE CONTROL UNIT STOP LAMP SWITCH VIO WIRE VIO/BLK WIRE VIO/WHT WIRE WHT WIRE YEL/WHT WIRE

BLK WIRE BLK/ORG WIRE BLK/RED WIRE BLK/WHT WIRE BLK/YEL WIRE BLU/BRN WIRE BLU/GRN WIRE BRN WIRE BRN/RED WIRE CAN-B_H STERN CAN-B_L CENTER STOP LAMP CLIMATE CONTROL OPERATING UNIT COMPUTER DATA LINES SYSTEM ENGINE COMPARTMENT FUSE, RELAY MODULE FUSE 21 FUSE 24 FUSE 64 GRN WIRE GRN/VIO WIRE GRY/BLK WIRE GRY/BLU WIRE GRY/GRN WIRE HAZARD SIG HOT W/ BATTERY DISCONNECT SWITCH RELAY ENERGIZED HOT W/ ENGINE COMPARTMENT TERMINAL 15 RELAY ENERGIZED LEFT FRONT LAMP UNIT LEFT LICENSE PLATE LAMP NCA WIRE PNK WIRE PNK/RED WIRE RED WIRE RED/BLK WIRE RFL (+) RIGHT FRONT LAMP UNIT RIGHT LICENSE PLATE LAMP SAM CONTROL UNIT (RIGHT FRONT FOOTWELL) SIG SIG (+) SIG 1 SIG (1) SIG (2) SIG 3 SML TL (+) TL (+) SIG 1 TL/PL (+) TSI (+) TSI R (+) TSI-L (+) VIO WIRE VIO/BLK WIRE VIO/GRN WIRE

BACKUP LAMPS CIRCUIT BLK WIRE BLK/ORG WIRE BLK/YEL WIRE BLU/BRN WIRE BRN WIRE CAN H H CAN H L CAN HMI H CAN HMI L CAN LR H CAN LR L COMPUTER DATA LINES SYSTEM ELECTRONIC STABILITY PROGRAM CONTROL UNIT EXTERIOR LIGHTS, ELECTRIC PARKING BRAKE SWITCH GROUP GRN WIRE GRN/BLK WIRE GRN/BLU WIRE GRN/WHT WIRE GRN/YEL WIRE GRY WIRE GRY/BLK WIRE GRY/BLU WIRE GRY/GRN WIRE GRY/WHT WIRE GRY/YEL WIRE INNER LEFT REAR LAMP UNIT INNER RIGHT REAR LAMP UNIT INSTRUMENT CLUSTER CONTROL UNIT LEFT REAR LAMP UNIT NCA WIRE PNK WIRE PNK/RED WIRE RED/BLK WIRE RIGHT REAR LAMP UNIT SIG SIG (1) SIG (2) SIG 3 SIG 4 STEERING COLUMN MODULE CONTROL UNIT STOP LAMP SWITCH VIO WIRE VIO/WHT WIRE WHT WIRE

BLK WIRE BLK/YEL WIRE BLU WIRE BLU/BRN WIRE BRN WIRE BRN/RED WIRE CAN B H STERN CAN B L CAN H H CAN H L CAN HMI H CAN HMI L CAN LR H CAN LR L CAN PER H CAN PER L COMPUTER DATA LINES SYSTEM ELECTRONIC STABILITY PROGRAM CONTROL UNIT ENGINE COMPARTMENT FUSE, RELAY MODULE EXTERIOR LIGHTS, ELECTRIC PARKING BRAKE SWITCH GROUP FUSE 169 FUSE 22 FUSE 48 GRN WIRE GRN/BLK WIRE GRN/BLU WIRE GRN/WHT WIRE GRN/YEL WIRE GRY/BLU WIRE GRY/WHT WIRE HOT W/ BATTERY DISCONNECT SWITCH RELAY ENERGIZED INSTRUMENT CLUSTER CONTROL UNIT LEFT FRONT LAMP UNIT LIN NCA WIRE PNK WIRE PNK/RED WIRE RAIN/LIGHT SENSOR W/ ADDITIONAL FUNCTIONS REAR AXLE LEVEL SENSOR RED/BLU WIRE RED/WHT WIRE RED/YEL WIRE RIGHT FRONT LAMP UNIT RIGHT FRONT LEVEL SENSOR RIGHT REAR LEVEL SENSOR SAM CONTROL UNIT (RIGHT FRONT FOOTWELL) SIG SIG (1) SIG (2) SIG 3 SIG 4 STEERING COLUMN MODULE CONTROL UNIT VEHICLE INTERIOR FUSE, RELAY MODULE VIO WIRE VIO/WHT WIRE W/ MULTI- LINK AXLE W/ TORSION- BEAM AXLE W/O STEEL SUSPENSION WHT WIRE

AUDIO H AUDIO L+ BLK WIRE BLK/BLU WIRE BLK/WHT WIRE BLU WIRE BRN WIRE CAN A H CAN A L CAN H H CAN H L CAN HMI H CAN HMI L COMPUTER DATA LINES SYSTEM ELECTRONIC STABILITY PROGRAM CONTROL UNIT ETH (+) WAKE UP ETH (-) ETHERNET EXTERIOR LIGHTS, ELECTRIC PARKING BRAKE SWITCH GROUP FUSE 111 FUSE 145 FUSE 158 FUSE 168 GRN WIRE GRN/BLK WIRE GRN/BLU WIRE GRN/WHT WIRE GRN/YEL WIRE GRY/WHT WIRE HAND MOTION SENSOR HEAD UNIT (LOWER LEFT END OF DASH) HEAD UNIT/INSTRUMENT CLUSTER DISPLAY CLUSTER HOT W/ BATTERY DISCONNECT SWITCH RELAY ENERGIZED HSVL INSTRUMENT CLUSTER CONTROL UNIT INSTRUMENT CLUSTER SPEAKER NCA WIRE RED WIRE RED/GRY WIRE SHD SHD CID/PIP SIG (1) SIG (2) SIG 3 SIG 4 VEHICLE INTERIOR FUSE, RELAY MODULE VIO WIRE VIO/WHT WIRE WAKE-UP WHT WIRE

BLU WIRE BRAKE FLUID LEVEL SWITCH BRN WIRE BRN/GRN WIRE BRN/RED WIRE BRN/WHT WIRE CAN B H CAN B H STERN CAN B L CAN H H CAN H L CENTRAL CONTROL MODULE COMPUTER DATA LINES SYSTEM DCS (+) DCS GND DRIVER DOOR CONTROL UNIT DRIVER DOOR LOCK DRIVER SEAT BELT BUCKLE SWITCH ELECTRONIC STABILITY PROGRAM CONTROL UNIT ENGINE COMPARTMENT FUSE, RELAY MODULE EXTERIOR LIGHTS, ELECTRIC PARKING BRAKE SWITCH GROUP FUSE 112 FUSE 156 FUSE 21 FUSE 24 GRN WIRE GRN/BLK WIRE GRN/BLU WIRE GRN/WHT WIRE GRN/YEL WIRE GRY/WHT WIRE HOT W/ BATTERY DISCONNECT SWITCH RELAY ENERGIZED LOCK UNLOCK MOT GND/(+) NCA WIRE OR/GRN WIRE ORG/GRN WIRE PNK/BLU WIRE PNK/VIO WIRE PNK/WHT WIRE RED WIRE RED/BLK WIRE RED/BLU WIRE RED/GRN WIRE RIGHT FRONT BRAKE WEAR SENSOR SIG SIG (1) SIG (2) SIG 3 SIG 4 SUPPLEMENTAL RESTRAINT SYSTEM CONTROL UNIT VEHICLE INTERIOR FUSE, RELAY MODULE W/ INCREASED THEFT PROTECTION WHT WIRE WHT/VIO WIRE YEL WIRE

BRN WIRE BRN/BLK WIRE BRN/YEL WIRE CAN HMI H CAN HMI L COMPUTER DATA LINES SYSTEM ELECTRONIC STABILITY PROGRAM CONTROL UNIT ENGINE COMPARTMENT FUSE, RELAY MODULE EXTERIOR LIGHTS, ELECTRIC PARKING BRAKE SWITCH GROUP FLEX-E BP FUSE 24 GRN WIRE GRN/BLK WIRE GRN/BLU WIRE GRN/WHT WIRE GRN/YEL WIRE HOT AT ALL TIMES INSTRUMENT CLUSTER CONTROL UNIT LEFT ELECTRIC PARKING BRAKE ACTUATOR MOTOR MOT GND/(+) MOT GND/(+) FLEX E BM PNK WIRE RED WIRE RED/BLK WIRE RED/YEL WIRE RIGHT ELECTRIC PARKING BRAKE ACTUATOR MOTOR SIG (1) SIG (2) SIG 3 SIG 4 VIO WIRE VIO/WHT WIRE