Mercedes-Benz C-class W204/S204 (2006-2011) (under right front seat) Wiring diagrams

30 31 CAN L CAN H BRN WIRE COMPUTER DATA LINES SYSTEM FUSE GRN WIRE GRN/WHT WIRE HOT AT ALL TIMES LEFT FRONT REVERSIBLE EMERGENCY TENSIONING RETRACTOR REAR SAM CONTROL MODULE W/ FUSE, RELAY MODULE (LEFT SIDE OF TRUNK/CARGO AREA) RED/VIO WIRE RED/WHT WIRE RIGHT FRONT REVERSIBLE EMERGENCY TENSIONING RETRACTOR

2 7 8 31 (+) (+) 30 31 CAN-B H CAN-B L BLK/GRY WIRE BLK/VIO WIRE BLU WIRE BLU/WHT WIRE BRN WIRE BRN/RED WIRE CAN C H CAN C L COMPUTER DATA LINES SYSTEM CONTROL UNIT) DRIVER SEAT CONTACTING STRIP FRONT PASSENGER SEAT CONTACTING FRONT SAM CONTROL UNIT W/ FUSE, RELAY MODULE (LEFT REAR OF ENGINE COMPT) FUSE 12 GRY/YEL WIRE HOT AT ALL TIMES LEFT FRONT BACKREST HEATED CUSHION (IF EQUIPPED) LEFT FRONT HEATED SEAT BUTTON LEFT FRONT SEAT SITTING SURFACE HEATED CUSHION (IF EQUIPPED) LIN 1 31 REAR SAM CONTROL UNIT W/ FUSE, RELAY MODULE (LEFT SIDE OF RED WIRE RED/GRN WIRE RIGHT FRONT BACKREST HEATED CUSHION (IF EQUIPPED) RIGHT FRONT HEATED SEAT BUTTON RIGHT FRONT SEAT SITTING SURFACE HEATED CUSHION (IF EQUIPPED) STRIP TRUNK/CARGO AREA) UPPER CONTROL PANEL

1 2 HOCH TIEF 1 2 VOR ZUR 2 1 TIEF HOCH 2 1 ZUR VOR BLK/BLU WIRE BLK/GRY WIRE BLK/VIO WIRE BLK/YEL WIRE BRN WIRE DRIVER SEAT BACKREST ADJUSTMENT SWITCH DRIVER SEAT HEIGHT ADJUSTMENT SWITCH DRIVER SEAT BACKREST INCLINATION ADJUSTMENT MOTOR (IN DRIVER'S SEAT BACK) DRIVER SEAT HEIGHT ADJUSTMENT MOTOR (UNDER DRIVER'S SEAT) DRIVER SEAT PARTIALLY ELECTRIC SEAT ADJUSTMENT SWITCH FRONT PASSENGER SEAT BACKREST ADJUSTMENT SWITCH FRONT PASSENGER SEAT HEIGHT ADJUSTMENT MOTOR (UNDER FRONT PASSENGER'S SEAT) FRONT PASSENGER SEAT HEIGHT ADJUSTMENT SWITCH FRONT PASSENGER SEAT PARTIALLY ELECTRIC SEAT ADJUSTMENT SWITCH FUSE REAR SAM CONTROL UNIT W/ FUSE, RELAY MODULE (LEFT SIDE OF TRUNK/CARGO AREA) RED WIRE SEAT ADJUSTMENT RELAY WHT/BLK WIRE WHT/GRN WIRE

1 2 4 5 HS 1 HS (+) FH H FH T 1 2 5 4 CAN B L CAN B H 1 2 5 4 CAN B L CAN B H 30 31 4 1 3 PASSENGER SIDE POWER WINDOW SWITCH 4 5 2 1 FH H FH T H (+) HS 1 7 6 31 SIG 9 6 8 LED SIG BLK WIRE BLK/BRN WIRE BLK/PNK WIRE BLK/VIO WIRE BRN WIRE BRN/RED WIRE COMPUTER DATA LINES SYSTEM DOOR FUSE 2 FUSE 3 FUSE 41 GRN WIRE GRY WIRE H (-) HOT AT ALL TIMES HOT W/ QUIESCENT CURRENT CUTOUT RELAY ENERGIZED HS(+) LEFT FRONT DOOR CONTROL UNIT LEFT FRONT POWER WINDOW MOTOR (CENTER OF LEFT FRONT DOOR) LEFT FRONT POWER WINDOW SWITCH LEFT REAR DOOR CONTROL UNIT LEFT REAR POWER WINDOW MOTOR (CENTER OF LEFT REAR LEFT REAR POWER WINDOW SWITCH NCA WIRE REAR SIDE RIGHT REAR WINDOW POWER CHILD SAFETY WINDOW LOCK SWITCH SWITCH RED WIRE RED/GRY WIRE RED/WHT WIRE RIGHT FRONT DOOR CONTROL UNIT RIGHT FRONT POWER WINDOW MOTOR (CENTER OF RIGHT FRONT DOOR) RIGHT REAR DOOR CONTROL UNIT RIGHT REAR POWER WINDOW MOTOR (CENTER OF RIGHT REAR RIGHT REAR POWER WINDOW SWITCH SIG WHT WIRE

1 2 CAN B L CAN B H 1 4 12 13 17 18 31 30 CAN E L CAN E H CAN B L CAN B H 12 31 6 5 31 31 RETURN LINE GSS, FA BBV HL BBV HR BFS BLU WIRE BRAKE FLUID LEVEL SWITCH (IN BRAKE FLUID RESERVOIR) 81 74 75 30 CAN E L CAN E H BRAKE FLUID, PARKING BRAKE WARNING LAMP BRN WIRE BRN/BLK WIRE BRN/RED WIRE BRN/WHT WIRE CAN B H CAN B L CAN E H CAN E L COMPUTER DATA LINES SYSTEM DRIVER SEAT BELT BUCKLE RESTRAINT SYSTEMS SWITCH (IN DRIVER'S SEAT BELT BUCKLE) FLAT WIRE FLAT WIRE FLAT WIRE 5 4 31 SIG FUSE 15 FUSE 28 GRN WIRE GRN/WHT WIRE GRY/GRN WIRE HOT W/ QUIESCENT CUT OUT RELAY ENERGIZED INSTRUMENT CLUSTER LEFT FRONT DOOR CENTRAL LOCKING INTERIOR SWITCH LEFT FRONT DOOR CONTROL UNIT MULTI-FUNCTION DISPLAY NCA WIRE PARKING BRAKE INDICATOR SWITCH (ON PARKING BRAKE SUPPORT BRACKET) RED/BRN WIRE RED/GRY WIRE RED/YEL WIRE RIGHT FRONT BRAKE PAD WEAR SENSOR (AT RIGHT FRONT BRAKE ASSEMBLY) RIGHT REAR BRAKE PAD WEAR SENSOR (AT RIGHT REAR BRAKE ASSEMBLY) SEAT BELT REMINDER LAMP SERVICE BRAKE IND LAMP SIG SUPPLEMENTAL RESTRAINT SYSTEM CONTROL UNIT (UNDER FRONT OF CENTER CONSOLE) WARNING BUZZER YEL WIRE YEL/RED WIRE

BLK WIRE BLK/GRY WIRE BLU WIRE BLU/BLK WIRE BLU/GRN WIRE BLU/YEL WIRE BRN WIRE BRN/BLK WIRE BRN/BLU WIRE BRN/GRN WIRE BRN/GRY WIRE BRN/PNK WIRE BRN/VIO WIRE BRN/YEL WIRE CAN-L CAN-H COMPUTER DATA LINES SYSTEM CRH OUT ANLG DOOR PRESSURE SENSOR (BOTTOM CENTER OF RIGHT FRONT FRONT DOOR) DRIVER AIR BAG SQUIB 1 DRIVER AIR BAG SQUIB 2 DRIVER SEAT BELT BUCKLE RESTRAINT SYSTEM SWITCH (IN DRIVER SEAT BELT BUCKLE) FANFARE HORNS, AIR BAG CLOCK SPRING CONTACT FRONT PASSENGER AIR BAG SQUIB 1 FRONT PASSENGER AIR BAG SQUIB 2 FRONT PASSENGER SEAT OCCUPIED RECOGNITION (W/ SEAT BELT REMINDER WARNING) FUSE 15 GRN WIRE GRN/WHT WIRE GRN/YEL WIRE GRY/GRN WIRE HOT AT ALL TIMES KB, FA- KB, FA+ LEFT FRONT DOOR PRESSURE SENSOR (BOTTOM CENTER OF LEFT FRONT FRONT DOOR) NCA WIRE PNK/BLK WIRE PNK/WHT WIRE RED/BRN WIRE RIGHT FRONT STEERING COLUMN MODULE CONTROL UNIT (TOP OF STEERING COLUMN) SUPPLEMENTAL RESTRAINT SYSTEM CONTROL UNIT (UNDER FRONT OF CENTER CONSOLE) VIO WIRE VIO/GRN WIRE WHT/YEL WIRE YEL WIRE YEL/BRN WIRE

BLK/GRY WIRE BLK/WHT WIRE BLK/YEL WIRE BLU WIRE BLU/YEL WIRE BRN WIRE BRN/BLU WIRE BRN/GRY WIRE BRN/PNK WIRE BRN/RED WIRE BRN/VIO WIRE BRN/WHT WIRE BRN/YEL WIRE CAN L COMPUTER DATA LINES SYSTEM DRIVER KNEEBAG SQUIB (IF EQUIPPED) FUSE 77 GRN/YEL WIRE GRY WIRE HOT AT ALL TIMES LEFT FRONTAL ACCELERATION SENSOR (BEHIND LEFT SIDE OF FRONT BUMPER) LEFT REAR EMERGENCY TENSIONING RETRACTOR SQUIB (IN LEFT "C" PILLAR) LEFT REAR SIDE BAG SQUIB (IF EQUIPPED) LEFT SIDE AIR BAG SENSOR (BASE OF LEFT "B" PILLAR) PNK WIRE PNK/BLK WIRE PNK/BLU WIRE PNK/WHT WIRE REAR SAM CONTROL MODULE W/ FUSE, RELAY MODULE (LEFT SIDE OF RED WIRE RED/BLU WIRE RED/VIO WIRE RIGHT FRONTAL ACCELERATION SENSOR (BEHIND RIGHT SIDE OF FRONT BUMPER) RIGHT SIDE AIR BAG IGNITION SQUIB (RIGHT SIDE OF FRONT PASSENGER'S SEAT BACK) RIGHT SIDE AIR BAG SENSOR (BASE OF RIGHT "B" PILLAR) SIG TRUNK/CARGO AREA) WHT WIRE WHT/BRN WIRE WHT/VIO WIRE WHT/YEL WIRE

AIR BAG SQUIB (IF EQUIPPED) BLK WIRE BLK/GRY WIRE BLK/VIO WIRE BLK/WHT WIRE BLK/YEL WIRE BLU/BLK WIRE BLU/GRN WIRE BRN WIRE BRN/BLK WIRE BRN/GRN WIRE BRN/PNK WIRE BRN/RED WIRE BRN/VIO WIRE BRN/YEL WIRE CENTER REAR SEAT BELT BUCKLE SWITCH COMPUTER DATA LINES SYSTEM DRIVER ETR (GUS) IGNITION SQUIB (AT BASE OF LEFT "B" PILLAR) DRIVER PELVIS AIR BAG SQUIB DRIVER SEAT NECK-PRO HEAD RESTRAINT SOLENOID FRONT ELECTRICAL PRE-FUSE BOX (AT RIGHT REAR OF ENGINE COMPT) FRONT PASSENGER ETR IGNITION SQUIB FRONT PASSENGER PELVIS FRONT PASSENGER SEAT NECK-PRO HEAD RESTRAINT SOLENOID FUSE 88 FUSE MODULE W/ FUSE, RELAY MODULE (LEFT SIDE OF TRUNK/ CARGO AREA) GRN WIRE GRN/VIO WIRE GRN/WHT WIRE GRN/YEL WIRE GRY WIRE GS, HL+ GS, HL- SB,BF- SB,BF+ GS, HR+ GS, HR- PG, BF- PG, BF+ PG, FA+ PG, FA- CAK, FA CAK, BF HOT AT ALL TIMES HOT W/ INSTRUMENT CLUSTER LEFT REAR SEAT BELT BUCKLE SWITCH LEFT WINDOW AIR BAG IGNITION SQUIB (LEFT REAR OF ROOF) PNK WIRE REAR SAM CONTROL RED WIRE RED/BLK WIRE RED/BLU WIRE RED/GRN WIRE RED/VIO WIRE RED/YEL WIRE RELAY ENERGIZED RIGHT REAR EMERGENCY TENSIONING RETRACTOR SQUIB (IN RIGHT "C" PILLAR) RIGHT REAR SEAT BELT BUCKLE SWITCH RIGHT REAR SIDE BAG SQUIB (IF EQUIPPED) RIGHT WINDOW AIR BAG IGNITION SQUIB (RIGHT REAR OF ROOF) SB, FA- SB, FA+ (+) (-) WB, VR- WB, VR+ SB, HR+ SB, HR- SUPPLEMENTAL RESTRAINT SYSTEM CONTROL UNIT SUPPLEMENTAL RESTRAINT SYSTEM INDICATOR LAMP VIO/BLU WIRE VIO/GRN WIRE VIO/YEL WIRE WHT WIRE WHT/BLK WIRE WHT/BRN WIRE WHT/GRN WIRE WHT/VIO WIRE

BLK/BLU WIRE BLK/GRY WIRE BLK/RED WIRE BLK/VIO WIRE BLK/YEL WIRE BRN WIRE DRIVER SEAT BACKREST INCLINATION ADJUSTMENT MOTOR (IN DRIVER'S SEAT BACK) DRIVER SEAT FORE/AFT ADJUSTMENT MOTOR (UNDER DRIVER'S SEAT) DRIVER SEAT HEIGHT ADJUSTMENT MOTOR (UNDER DRIVER'S SEAT) DRIVER SEAT INCLINATION ADJUSTMENT MOTOR (UNDER DRIVER'S SEAT) FRONT ELECTRICAL PREFUSE BOX FRONT PASSENGER SEAT FORE/AFT ADJUSTMENT MOTOR FRONT PASSENGER SEAT HEIGHT ADJUSTMENT MOTOR (UNDER FRONT PASSENGER'S SEAT) FRONT PASSENGER SEAT INCLINATION ADJUSTMENT MOTOR (UNDER FRONT PASSENGER'S SEAT) FUSE (AT RIGHT REAR OF ENGINE COMPT) FUSE FUSE HOT W/ QUIESCENT CURRENT CUTOUT RELAY ENERGIZED LEFT FRONT BACKREST ADJUSTMENT SWITCH LEFT FRONT SEAT ADJUSTMENT SWITCH GROUP LEFT FRONT SEAT HEIGHT ADJUSTMENT SWITCH REAR SAM CONTROL UNIT W/ FUSE, RELAY MODULE (LEFT SIDE OF TRUNK/CARGO AREA) RED WIRE RIGHT FRONT BACKREST ADJUSTMENT SWITCH RIGHT FRONT SEAT ADJUSTMENT SWITCH GROUP RIGHT FRONT SEAT HEIGHT ADJUSTMENT SWITCH SEAT ADJUSTMENT RELAY VOR ZUR HOCH TIEF VOR ZUR HOCH TIEF WHT WIRE WHT/BLK WIRE WHT/BLU WIRE WHT/GRN WIRE ZUR VOR TIEF HOCH ZUR VOR TIEF HOCH

30 SIG GND 30 SIG GND 31 BELT TENSION SENSOR (ON RIGHT "B" PILLAR, IN PASSENGER'S SEAT BELT ANCHOR) BLU WIRE BRN WIRE BRN/BLU WIRE BRN/RED WIRE BRN/WHT WIRE CAN B H CAN B L COMPUTER DATA LINES SYSTEM GRY WIRE PNK WIRE PNK/BLK WIRE PNK/BLU WIRE PNK/WHT WIRE SEAT OCCUPIED RECOGNITION PRESSURE SENSOR (BOTTOM OF RIGHT FRONT SEAT) WEIGHT SENSING SYSTEM (WSS) CONTROL UNIT (UNDER FRONT PASSENGER'S SEAT) WHT WIRE