Mercedes-Benz C-class W203/S203/CL203 facelift (2004-2008) computer data lines system Wiring diagrams

1 2 CAN B L CAN B H 11 8 RR BACKUP LR BACKUP 4 5 6 CAN-B L CAN-B H REVERSE 6 7 CA CAN-B L CAN-B H BACK UP LAMP BACK- UP LAMP SWITCH (M/T) (ON RIGHT REAR OF TRANSMISSION) BLU WIRE BRN WIRE BRN/GRN WIRE BRN/GRY WIRE BRN/RED WIRE COMPUTER DATA LINES SYSTEM ELECTRONIC SELECTOR LEVER CONTROL MODULE (A/T) (AT BASE OF GEAR SHIFT ASSEMBLY FRONT SAM CONTROL MODULE W/ FUSE, RELAY MODULE (LEFT REAR OF ENGINE COMPT) GRN WIRE GRN/WHT WIRE GRY WIRE GRY/BLU WIRE GRY/YEL WIRE LEFT TAILLAMP UNIT REAR SAM CONTROL MODULE W/ FUSE, RELAY MODULE (LEFT SIDE OF TRUNK) RIGHT TAILLAMP UNIT YEL WIRE

1 2 9 10 4 31 30 CAN-B L CAN-B H 31 11 12 CAN-B H CAN-B L 4 5 CAN-B L CAN-B H 6 7 CAN-B H CAN-B L BLK WIRE BLU/RED WIRE BRN WIRE BRN/BLU WIRE BRN/GRN WIRE BRN/GRY WIRE BRN/PNK WIRE BRN/RED WIRE BRN/WHT WIRE BRN/YEL WIRE COMPUTER DATA LINES SYSTEM CONTACT SWITCH (SEDAN, WAGON) (AT RIGHT "C" PILLAR) CTSY LMP EXCEPT WAGON FRONT DOME FRONT PRE-FUSE BOX (AT RIGHT REAR OF ENGINE COMPT) FUSE 2 FUSE 4 GLOVE COMPARTMENT SWITCH, LAMP HOT AT ALL TIMES HOT AT ALL TIMES FUSE 9 LEFT FRONT DOOR CONTACT SWITCH LEFT FRONT DOOR CONTROL MODULE LEFT FRONT DOOR ENTRANCE, EXIT LAMP LEFT FRONT READING LEFT READING LEFT REAR DOOR CONTACT SWITCH (SEDAN, WAGON) (AT LEFT "C" PILLAR) LEFT REAR DOOR CONTROL LEFT VANITY MIRROR LAMP OVERHEAD CONTROL PANEL CONTROL MODULE PNK/RED WIRE REAR DOME REAR DOME LAMP REAR LEFT DOME TRUNK LAMP LAMP REAR SAM CONTROL MODULE W/ FUSE, RELAY MODULE (LEFT SIDE OF TRUNK/CARGO AREA) RED WIRE RED/BLU WIRE RED/GRN WIRE RED/GRY WIRE RED/YEL WIRE RELAY ENERGIZED RIGHT FRONT DOOR CONTACT SWITCH (AT RIGHT "B" PILLAR) RIGHT FRONT DOOR CONTROL MODULE RIGHT FRONT DOOR ENTRANCE, EXIT LAMP RIGHT FRONT READING RIGHT READING RIGHT REAR DOOR RIGHT REAR DOOR CONTROL MODULE RIGHT TRUNK LAMP RIGHT VANITY MIRROR LAMP TRUNK AJAR TRUNK LAMP TRUNK LID CONTACT SWITCH (AT CENTER REAR OF TRUNK LID) VIO/BLU WIRE WAGON YEL WIRE

17 18 12 13 CAN-B L CAN-B H CAN-C L CAN-C H 2 1 CAN-B L CAN-B H 2 3 4 KPR 87 15 4 5 CAN-B L CAN-B H 7 3 11 10 2 8 RF TURN RF PARK RF MARK LF MARK LF PARK LF TURN 7 6 CAN-B L CAN-B H BLK WIRE BLK/GRN WIRE BLK/WHT WIRE BLK/YEL WIRE BLU/RED WIRE BLU/WHT WIRE BLU/YEL WIRE BRN WIRE BRN/BLU WIRE BRN/RED WIRE BRN/YEL WIRE COMPUTER DATA LINES SYSTEM EXTERIOR LAMPS FOG LAMP FOG LAMP IND FRONT SAM CONTROL MODULE W/ FUSE, RELAY MODULE (LEFT REAR OF ENGINE COMPT) FUSE 50 GRN WIRE GRN/BLK WIRE GRN/GRY WIRE GRN/PNK WIRE GRN/RED WIRE GRN/WHT WIRE GRY WIRE GRY/BLK WIRE GRY/BLU WIRE GRY/RED WIRE GRY/WHT WIRE GRY/YEL WIRE HEAD AUTO HEADLAMP WASH HOT AT ALL TIMES FUSE 62 HOT AT ALL TIMES FUSE 63 HOT W/ CIRCUIT IN OUT INSTRUMENT CLUSTER LAMP SWITCH MODULE LEFT EXTERIOR MIRROR LEFT FRONT DOOR CONTROL MODULE (IN DRIVER'S DOOR) LEFT FRONT SIDE MARKER LAMP RIGHT FRONT SIDE MARKER LAMP LEFT HEADLAMP UNIT LEFT RIGHT LEFT TURN IND LIGHT MIRROR FOLD- MIRROR SELECT MIRROR ADJUST NCA WIRE PARK OFF PNK/RED WIRE RED WIRE RIGHT EXTERIOR MIRROR RIGHT FRONT DOOR CONTROL MODULE RIGHT HEADLAMP UNIT RIGHT TURN IND SOUNDER- SRA NSL STAND/ PARK LAMP STAND/ PARK LAMP TURN LAMP TURN TURN LAMP VIO/BLU WIRE WHT WIRE YEL WIRE

1 2 CAN B L CAN B H 12 13 11 10 CAN-B L CAN-B H CAN-B L CAN-B H 24 25 23 R LICENSE L LICENSE CHMSL 3 4 CAN-B L CAN-B H 31 RS 9 10 CAN-B L CAN-B H BACK- UP LAMP STOP LAMP BLK WIRE BLK/BLU WIRE BLK/GRN WIRE BLK/RED WIRE BLK/WHT WIRE BLK/YEL WIRE BLU WIRE BLU/RED WIRE BRN WIRE BRN/GRN WIRE BRN/GRY WIRE BRN/RED WIRE BRN/YEL WIRE CENTER HIGH MOUNT STOP LAMP COMBINATION SWITCH COMPUTER DATA LINES SYSTEM COUPE, SEDAN, WAGON FRONT PRE-FUSE BOX (AT RIGHT REAR OF ENGINE COMPT) FUSE 2 FUSE 4 GRN WIRE GRN/WHT WIRE GRY WIRE GRY/BLK WIRE GRY/BLU WIRE GRY/RED WIRE GRY/VIO WIRE GRY/YEL WIRE HAZARD SWITCH HOT AT ALL TIMES LEFT REAR SIDE MARKER LAMP (COUPE) LEFT TAIL LAMP UNIT LEFT TRUNK LAMP LEFT, RIGHT TURN SIGNAL SWITCH OVERHEAD CONTROL PANEL CONTROL MODULE PNK/RED WIRE RAIN/ LIGHT SENSOR (AT FRONT OF HEADLINER) REAR SAM CONTROL MODULE W/ FUSE, RELAY MODULE (LEFT SIDE OF TRUNK) RED WIRE RIGHT LICENSE PLATE LAMP LEFT LICENSE PLATE LAMP RIGHT REAR SIDE MARKER LAMP (COUPE) RIGHT TAILLAMP UNIT RIGHT TRUNK LAMP SEDAN WAGON STEERING COLUMN MODULE (AT TOP OF STEERING COLUMN) TAIL/ PARK LAMP TURN SIGNAL LAMP TURN SIGNAL LAMP TAIL/ PARK LAMP BACK- UP LAMP STOP LAMP UPPER CONTROL PANEL CONTROL MODULE VIO WIRE VIO/BLU WIRE WHT WIRE YEL WIRE

17 18 12 13 CAN-B L CAN-B H CAN-B L CAN-B H 2 1 CAN L CAN H 4 5 CAN L CAN H 56 NSL 6 5 2 1 4 3 R LO BEAM R HI BEAM R FOG L FOG L LO BEAM L HI BEAM 9 10 CAN-B L CAN-B H BLK WIRE BLU/WHT WIRE BLU/YEL WIRE BRN WIRE BRN/BLU WIRE BRN/RED WIRE COMPUTER DATA LINES SYSTEM EXTERIOR LAMPS FOG LAMP FOG LAMP IND FRONT PRE-FUSE BOX (AT RIGHT REAR OF ENGINE COMPT) FRONT SAM CONTROL UNIT W/ FUSE, RELAY MODULE (LEFT REAR OF ENGINE COMPT) FUSE 4 FUSE 62 GRN WIRE GRN/BLK WIRE GRN/GRY WIRE GRN/PNK WIRE GRN/RED WIRE GRN/WHT WIRE GRY/BLU WIRE GRY/YEL WIRE HEADLAMP WASH HIGH BEAM INDICATOR HIGH BEAM LOW BEAM HOT AT ALL TIMES HOT AT ALL TIMES FUSE 63 HOT IN RUN OR START FUSE 50 INSTRUMENT CLUSTER LAMP SWITCH MODULE LEFT FRONT HEADLAMP UNIT LEFT RIGHT MIRROR FOLD- MIRROR SELECT MIRROR ADJUST OUT IN OVERHEAD CONTROL PANEL CONTROL MODULE PARK HEAD OFF AUTO RED WIRE RIGHT FRONT FOG LAMP LEFT FRONT FOG LAMP RIGHT FRONT HEADLAMP UNIT SRA WHT WIRE WHT/BLK WIRE YEL WIRE YEL/BLK WIRE

17 18 12 13 CAN-B L CAN-B H CAN-B L CAN-B H 2 1 CAN L CAN H 4 5 CAN L CAN H 56 NSL 6 5 2 4 3 1 R LO BEAM R HI BEAM R FOG L LO BEAM L HI BEAM L FOG 9 10 CAN-B L CAN-B H BLK WIRE BLK/GRN WIRE BLK/PNK WIRE BLU/WHT WIRE BLU/YEL WIRE BRN WIRE BRN/BLU WIRE BRN/RED WIRE COMPUTER DATA LINES SYSTEM DIAG EXTERIOR LAMPS FOG LAMP FOG LAMP IND FRONT AXLE SENSOR (RIGHT FRONT WHEEL HOUSE) FRONT PRE-FUSE BOX (AT RIGHT REAR OF ENGINE COMPT) FRONT SAM CONTROL MODULE W/ FUSE, RELAY MODULE (LEFT REAR OF ENGINE COMPT) FUSE 4 GRN WIRE GRN/BLK WIRE GRN/GRY WIRE GRN/PNK WIRE GRN/RED WIRE GRN/WHT WIRE GRY WIRE GRY/BLU WIRE GRY/YEL WIRE HEADLAMP RANGE ADJUSTMENT MOTOR HEADLAMP WASH HIGH BEAM INDICATOR HIGH XENON BEAM XENON BEAM HOT AT ALL TIMES HOT AT ALL TIMES FUSE 62 HOT AT ALL TIMES FUSE 63 HOT IN RUN OR START FUSE 50 HOT IN RUN OR START FUSE 51 IN OUT INSTRUMENT CLUSTER LAMP SWITCH MODULE LEFT FRONT FOG LAMP LEFT FRONT HEADLAMP UNIT LEFT RIGHT MIRROR ADJUST MIRROR FOLD- MIRROR SELECT OVERHEAD CONTROL PANEL CONTROL MODULE PARK HEAD OFF AUTO REAR AXLE SENSOR (RIGHT SIDE OF REAR AXLE) RED WIRE RED/GRN WIRE RED/YEL WIRE RIGHT FRONT FOG LAMP RIGHT FRONT HEADLAMP UNIT SRA WHT WIRE WHT/BLK WIRE WHT/RED WIRE XENON CONTROL HIGH XENON BEAM XENON MODULE BEAM XENON IGNITION MODULE XENON XENON IGNITION CONTROL MODULE MODULE YEL WIRE YEL/BLK WIRE YEL/WHT WIRE

10 11 13 12 9 8 CAN-C H CAN-C L CAN-B H CAN-B L 30 31 BLK WIRE BLK/WHT WIRE BRN WIRE BRN/RED WIRE CAN B L CAN B H COMPUTER DATA LINES SYSTEM FANFARE HORNS FANFARE HORNS RELAY FANFARE HORNS, AIRBAG CLOCK SPRING CONTACT (INSIDE STEERING WHEEL) FRONT SAM CONTROL MODULE W/ FUSE, RELAY MODULE (LEFT REAR OF ENGINE COMPT) FUSE 4 GRN WIRE GRN/WHT WIRE HORN SWITCH HOT AT ALL TIMES HOT AT ALL TIMES FRONT PRE-FUSE BOX (AT RIGHT REAR OF ENGINE COMPT) FUSE 6 LEFT MULTI-FUNCTION STEERING WHEEL PUSHBUTTON GROUP NCA WIRE RED WIRE RED/BLU WIRE RELAY RELAY RELAY RIGHT MULTI-FUNCTION STEERING WHEEL PUSHBUTTON GROUP STEERING COLUMN MODULE (AT TOP OF STEERING COLUMN) STR WHL WHT WIRE

1 2 7 9 3 CAN L CAN H L FUEL (-) R FUEL 40 41 CAN L CAN H 41 54 CAN H CAN L 6 7 CAN L CAN H ABS MIL AIR BAG INDICATOR, WARNING LAMP AREA) BLK/BRN WIRE BLU/BLK WIRE BLU/YEL WIRE BRAKE FLUID INDICATOR SWITCH (IN BRAKE FLUID RESERVOIR) BRAKE FLUID, PARKING BRAKE WARNING LAMP BRK FLUID BRN WIRE BRN/BLK WIRE BRN/GRN WIRE BRN/GRY WIRE BRN/RED WIRE BRN/WHT WIRE CAN L CAN H DRVR BELT CAN-L CAN-H COMPUTER DATA LINES SYSTEM DRIVER SEAT BELT BUCKLE RESTRAINT SYSTEMS SWITCH DTR WARNING LAMP ELECTRONIC SELECTOR LEVER MODULE CONTROL MODULE (AT BASE OF GEAR ELECTRONIC SPEEDOMETER ENGINE DIAGNOSIS MALFUNTION INDICATOR LAMP ESP WARNING LAMP ETC (EGS) CONTROL MODULE (UNDER RIGHT SIDE OF DASH) FRONT SAM CONTROL UNIT W/ FUSE, RELAY MODULE (LEFT REAR OF ENGINE COMPT) FUEL LEVEL GAUGE W/ RESERVE INDICATOR FUSE 42 FUSE 51 GEAR DISPLAY (PRNDL) GRN WIRE GRN/WHT WIRE GRY/GRN WIRE HIGH BEAM INDICATOR LAMP HOT AT ALL TIMES HOT W/ CIRCUIT ILLUMINATION ILLUMINATION RHEOSTAT INSTRUMENT CLUSTER INTERIOR FUSE BOX (LEFT END OF DASH) LEFT FUEL LEVEL SENSOR (UNDER LEFT REAR SEAT) LEFT TURN INDICATOR ME-SFI CONTROL MODULE (AT LEFT REAR OF ENGINE COMPT) MULTIFUNCTION DISPLAY NCA WIRE PARKING BRAKE INDICATOR SWITCH (ON PARKING BRAKE SUPPORT BRAKET) PRK BRK REAR SAM CONTROL UNIT W/ FUSE, RELAY MODULE (LEFT SIDE OF TRUNK CARGO, RED/YEL WIRE RESTRAINT SYSTEMS CONTROL MODULE (UNDER FRONT OF CENTER CONSOLE) RIGHT FUEL LEVEL SENSOR (UNDER RIGHT REAR SEAT) RIGHT TURN INDICATOR SEAT BELT REMINDER LAMP SHIFT ASSEMBLY) SOUNDER- TACHOMETER TRIP ODOMETER RESET BUTTON WARNING BUZZER

31 AIS AMBIENT LAMP AUTOMATIC DIMMING MIRROR BLK WIRE BLU WIRE BRN WIRE BRN/BLU WIRE BRN/RED WIRE CAN-BL CAN-BH COMPUTER DATA LINES SYSTEM EMERGENCY CALL SYSTEM CONTROL UNIT (FRONT OF CARGO AREA) FORWARD AUTOMATIC DIMMING FRONT SAM CONTROL UNIT W/ FUSE, RELAY MODULE (LEFT REAR OF ENGINE COMPT) FUSE W/ FUSE, RELAY MODULE (LEFT SIDE OF TRUNK/ CARGO AREA.) GARAGE DOOR OPENER PUSHBUTTON 1 GARAGE DOOR OPENER PUSHBUTTON 2 GARAGE DOOR OPENER PUSHBUTTON 3 GARAGE DOOR OPENER TRANSMITTER UNIT GRN WIRE GRY/BLU WIRE HOT AT ALL TIMES INTERIOR LIGHTS SYSTEM COMPUTER DATA LINES SYSTEM INTERIOR REARVIEW MIRROR UNIT MIRROR SENSOR MIRROR SENSOR BACKWARD AUTOMATIC DIMMING NCA WIRE OVERHEAD CONTROL PANEL CONTROL MODULE PNK/RED WIRE POWER TOPS SYSTEM RAIN/LIGHT SENSOR (AT FRONT OF HEADLINER) REAR SAM CONTROL MODULE RED/BLU WIRE RS 31 SOS PUSHBUTTON SWITCH VIO WIRE YEL WIRE YEL/RED WIRE YEL/VIO WIRE

ACCELERATOR PEDAL SENSOR (TOP OF ACCELERATOR PEDAL ASSEMBLY) ACTIVATED CHARCOAL CANISTER SHUTOFF VALVE (ABOVE RIGHT REAR WHEELWELL) AIR AIR PUMP RELAY BLK/BLU WIRE BLK/GRN WIRE BLK/RED WIRE BLU WIRE BLU/BRN WIRE BLU/RED WIRE BLU/YEL WIRE BODY CONTROL MODULES (UNDER DRIVER SEAT) SYSTEM BRN WIRE BRN/GRN WIRE BRN/GRY WIRE BRN/ORG WIRE BRN/VIO WIRE BRN/WHT WIRE BRN/YEL WIRE CAN C H CAN C L COMPUTER DATA LINES SYSTEM DATA LINK CONNECTOR (UNDER LEFT SIDE OF DASH) DIAG. TNA 50 ENGINE CIRCUIT 87 RELAY ENGINE, A/C ELECTRIC SUCTION FAN WITH INTEGRATED CONTROL (AT FRONT OF ENGINE) FRONT SAM CONTROL MODULE W/ FUSE, RELAY MODULE (AT LEFT REAR OF ENGINE COMPT) FUEL PUMP FUEL TANK PRESSURE SENSOR (UNDER LEFT REAR SEAT) FUSE 5 FUSE 53 FUSE 54 FUSE 57 FUSE 65 GND 87 GND GRN WIRE GRN/VIO WIRE GRN/WHT WIRE GRN/YEL WIRE GRY/BLU WIRE GRY/VIO WIRE HOT AT ALL TIMES HOT AT ALL TIMES FRONT PRE-FUSE BOX (AT RIGHT REAR OF ENGINE COMPT) ME-SFI CONTROL MODULE (AT LEFT REAR OF ENGINE COMPT) NCA WIRE PNK/RED WIRE PURGE CONTROL VALVE (IN LEFT REAR CORNER OF ENGINE COMPT) PWG+ (-) RED WIRE RED/BLK WIRE RED/BLU WIRE RED/GRN WIRE RED/WHT WIRE RV 61 SIG TNA VIO/GRN WIRE VIO/WHT WIRE VIO/YEL WIRE