Mercedes-Benz C-class W203/S203/CL203 (2000-2004) diag Wiring diagrams

2.6L 3.2L BA MV- UM 1 SS RF SS RF BLA SS LR SS LR BRK WEAR BLA BLK/GRN WIRE BLK/GRY WIRE BLK/RED WIRE BLU WIRE BLU/BLK WIRE BLU/BRN WIRE BLU/GRN WIRE BLU/GRY WIRE BLU/WHT WIRE BLU/YEL WIRE BRN WIRE BRN/BLU WIRE BRN/GRN WIRE BRN/RED WIRE BRN/WHT WIRE BRN/YEL WIRE CAN B H CAN B L CAN-C H VSS RF SPS SOL VSS LF CAN-C L 31 BA MV+ COMPUTER DATA LINES SYSTEM DIAG DIAPHRAGM TRAVEL SENSOR ESP, BAS CONTROL MODULE (LEFT SIDE OF ENGINE COMPT) FRONT AXLE INLET SOLENOID VALVE FRONT AXLE SWITCH- OVER SOLENOID VALVE FUSE 59 FUSE 60 GRN WIRE GRN/BLU WIRE GRN/RED WIRE GRN/WHT WIRE GRN/YEL WIRE GRY/YEL WIRE HIGH PRESSURE, RETURN PUMP MOTOR HOT AT ALL TIMES LEFT FRONT AXLE SOLENOID VALVE (HOLD) LEFT FRONT AXLE SOLENOID VALVE (RELEASE) LEFT FRONT WHEEL SPEED SENSOR LEFT REAR AXLE SOLENOID VALVE (HOLD) LEFT REAR AXLE SOLENOID VALVE (RELEASE) LEFT REAR WHEEL SPEED SENSOR LSR TR, LA NCA WIRE REAR AXLE INLET SOLENOID VALVE REAR AXLE SWITCH- OVER SOLENOID VALVE RED WIRE RED/BLK WIRE RED/BLU WIRE RED/GRN WIRE RED/GRY WIRE RED/VIO WIRE RED/WHT WIRE RED/YEL WIRE RELEASE SWITCH RIGHT FRONT AXLE SOLENOID VALVE (HOLD) RIGHT FRONT AXLE SOLENOID VALVE (RELEASE) RIGHT FRONT BRAKE PAD CONTACT SENSOR RIGHT FRONT WHEEL SPEED SENSOR RIGHT REAR AXLE SOLENOID VALVE (HOLD) RIGHT REAR AXLE SOLENOID VALVE (RELEASE) RIGHT REAR BRAKE PAD CONTACT SENSOR RIGHT REAR WHEEL SPEED SENSOR SOLENOID VALVE SPS SOLENOID VALVE (UNDER VEHICLE, ON STEERING RACK) SS RR SS RR SPS SOL SS LF SS LF 31 TR, LA TR, LA BRK WEAR TURN RATE, LATERAL ACCELERATION SENSOR (FRONT OF CARGO AREA) VIO/BLU WIRE VIO/WHT WIRE VSS LF VSS RF WHT/BLU WIRE YEL/BLU WIRE YEL/GRY WIRE YEL/RED WIRE YEL/WHT WIRE

1 2 3 4 5 6 7 CA 87 31 MODE KICKDN DIAG CAN L CAN H 1 2 3 4 5 CB GEAR GEAR GEAR GEAR 1 PINS 2 THRU 28: NOT USED 29 30 DIAG 2-3 SHIFT VALVE LOCK UP VALVE 3-4 SHIFT VALVE 1-2/ 4-5 VALVE AUTOMATIC TRANSMISSION PROGRAM SELECTOR PUSHBUTTON BLK/BLU WIRE BLK/GRN WIRE BLK/WHT WIRE BLK/YEL WIRE BLU WIRE BRN WIRE BRN/RED WIRE CAN (-) CAN (+) CAN L COMPUTER DATA LINES SYSTEM DIAG ELECTRONIC SELECTOR LEVER CONTROL MODULE (BASE OF GEAR SELECTOR LEVER) ETC CONTROL MODULE (UNDER RIGHT SIDE OF DASH) FRONT SAM CONTROL MODULE W/ FUSE, RELAY MODULE (LEFT REAR OF ENGINE COMPT) GEAR DISPLAY SENSOR GRN WIRE GRN/WHT WIRE GRY WIRE GRY/BLU WIRE GRY/YEL WIRE ILLUM INTERLOCK SWITCH KICKDOWN SWITCH (IN ACCEL PEDAL ASSEMBLY) MODUL- ATOR VALVE PNK RPM 2 SENSOR V+ 1-2/4-5 VLV 3-4 VLV 2-3 VLV PWM VLV WIRE PNK WIRE RED/BLU WIRE RED/WHT WIRE RPM SENSOR 2 RPM SENSOR 3 SENSOR GROUND TEMP/START RPM 3 MODULATOR VLV SHIFT VLV VLV SUPPLY SHIFT VALVE TEMP SENSOR VALVE UNIT (RIGHT FRONT OF TRANSMISSION HOUSING) WHT WIRE WHT/BRN WIRE WHT/GRN WIRE YEL WIRE

4 5 CAN-B L CAN-B H BLK/GRN WIRE BRAKE BOOSTER VACUUM PUMP (RIGHT FRONT OF ENGINE COMPT) BRAKE BOOSTER VACUUM PUMP CONTROL MODULE (IN FRONT PASSENGER FOOTWELL) BRN WIRE BRN/GRN WIRE BRN/RED WIRE COMPUTER DATA LINES SYSTEM DIAG DIAG CAN-C H CAN-C L 15 FRONT SAM CONTROL MODULE W/ FUSE, RELAY MODULE (LEFT REAR OF ENGINE COMPT) FUSE 37 GRN WIRE GRN/BLU WIRE GRN/WHT WIRE HOT AT ALL TIMES INTERIOR FUSE BOX (UNDER LEFT END OF DASH) RED/GRN WIRE RED/WHT WIRE

2 1 CAN L CAN H 2.6L 3.2L 4 5 CAN L CAN H BLK WIRE BLU/YEL WIRE BRAKE BOOSTER VACUUM PUMP CONTROL MODULE BRN WIRE BRN/RED WIRE BRN/WHT WIRE COMAND OPERATING, DISPLAY, CONTROL MODULE COMPUTER DATA LINES SYSTEM (HIGH/LOW BUS CIRCUIT) DATALINK CONNECTOR (UNDER LEFT SIDE OF DASH) DI CONTROL MODULE DIAG ENGINE CONTROL MODULE (LEFT REAR OF ENGINE COMPT) ETC CONTROL MODULE (UNDER RIGHT SIDE OF DASH) FRONT PRE-FUSE BOX (RIGHT REAR OF ENGINE COMPT) FRONT SAM CONTROL MODULE W/ FUSE, RELAY MODULE (LEFT REAR OF ENGINE COMPT) FUSE 4 FUSE 62 GRN/BLK WIRE GRN/BLU WIRE GRN/PNK WIRE GRN/RED WIRE GRY WIRE GRY/YEL WIRE HOT AT ALL TIMES LEFT HEADLAMP UNIT RIGHT HEADLAMP UNIT PNK/RED WIRE RADIO TELEPHONE, TELE AID TRANSMITTER/ RECEIVER RED WIRE RED/GRN WIRE W/ COMAND W/O COMAND WHT/BRN WIRE WHT/GRN WIRE WHT/YEL WIRE

AIR PUMP RELAY ANTI-LOCK BRAKES SYSTEM BLA BLK WIRE BLK/GRN WIRE BLK/GRY WIRE BLK/PNK WIRE BLK/RED WIRE BLK/YEL WIRE BRN WIRE BRN/RED WIRE CIRCUIT CIRCUIT 15 RELAY CIRCUIT 87 RELAY (CHASSIS) CIRCUIT 87 RELAY (ENGINE) CRASH DIAG FANFARE HORNS RELAY FROM FUSE 42 (DIAGRAM 1 OF 3) FRONT PRE-FUSE BOX (RIGHT REAR OF ENGINE COMPT) FRONT SAM CONTROL MODULE W/ FUSE, RELAY MODULE (LEFT REAR OF ENGINE COMPT) FUSE 4 FUSE 44 FUSE 46 FUSE 47 FUSE 48 FUSE 49 FUSE 50 FUSE 51 FUSE 45 FUSE 52 FUSE 53 FUSE 54 FUSE 55 FUSE 56 FUSE 57 FUSE 6 FUSE 62 FUSE 65 40 GRN WIRE GRY WIRE GRY/YEL WIRE HEADLIGHTS SYSTEM HOT AT ALL TIMES PNK/BLK WIRE RANGE RED WIRE RED/BLU WIRE RED/GRN WIRE RED/WHT WIRE RED/YEL WIRE RELAY STARTER RELAY STARTING SYSTEM ENGINE CONTROLS SYSTEM SUPPLEMENTAL RESTRAINTS SYSTEM TELEPHONE, TELE AID TRANSMITTER TO PIN 1, TO PIN 2, TO PIN 3, TO PIN 4, TO PIN 6, TO PIN 8, TO PIN 8, TO PIN 4, TO PIN 9, TRANSMISSION SYSTEM VIO WIRE VSS LF VSS RF WIPER WIPER ON/OFF RELAY WIPER STAGE 1-2 RELAY WIPER/WASHER SYSTEM YEL WIRE

1 2 3 4 NA KPR 1 2 5 CAN-B L CAN-B H NA 1 2 DIAG 15 HOOD 2 3 4 5 6 7 8 9 10 FROM FANFARE HORNS RELAY (DIAGRAM 1 OF 3) 2001, 2002 EARLY PROD 2002 LATE PROD ABS SYSTEM ANTI-LOCK BRAKES SYSTEM ANTI-THEFT SYSTEM ENGINE CONTROLS SYSTEM ENGINE CONTROLS SYSTEM BLK WIRE BLK/BRN WIRE BLK/GRN WIRE BLK/RED WIRE BLK/WHT WIRE BLK/YEL WIRE BLU/RED WIRE BRN WIRE BRN/RED WIRE COMPUTER DATA LINES SYSTEM COOLING FANS SYSTEM (CL) CPP BRIDGE DATA LINK CONNECTOR (UNDER LEFT SIDE OF DASH) DI CONTROL MODULE DIAG ECM DIAG ENGINE CONTROLS SYSTEM FROM FUSE 47 (DIAGRAM 1 OF 3) FROM FUSE 48 (DIAGRAM 1 OF 3) FROM FUSE 50 (DIAGRAM 1 OF 3) FROM FUSE 51 (DIAGRAM 1 OF 3) FROM FUSE 53 (DIAGRAM 1 OF 3) FROM FUSE 54 (DIAGRAM 1 OF 3) FROM FUSE 57 (DIAGRAM 1 OF 3) FRONT CIGAR LIGHTER FRONT SAM CONTROL MODULE W/ FUSE, RELAY MODULE (LEFT REAR OF ENGINE COMPT) FUSE 57 FUSE 59 FUSE 60 FUSE 62 FUSE 63 FUSE 64 GRN/BLK WIRE GRN/BLU WIRE GRN/RED WIRE GRY/YEL WIRE HEADLIGHTS SYSTEM HORNS SYSTEM ENGINE CONTROLS SYSTEM HOT AT ALL TIMES INSTRUMENT CLUSTER KPR MEMORY SYSTEM PNK/RED WIRE PNK/YEL WIRE REAR SAM CONTROL MODULE W/ FUSE, RELAY MODULE RED WIRE RED/BLU WIRE RED/GRN WIRE RED/YEL WIRE SOUND SYSTEMS SOUND SYSTEMS VIO/WHT WIRE YEL WIRE

1 2 3 4 5 6 7 8 9 10 DIAG 1 2 3 4 5 6 7 TEMP R PRESS R PRESS FAN SRA R PRESS 1 2 3 4 5 6 L FOG R FOG L HI L LO R HI R LO 1 2 PNK DIAG WIRE A/C SYSTEM A/C SYSTEM CHARGING SYSTEM ANTI-LOCK BRAKES SYSTEM BLK WIRE BLK/BLU WIRE BLK/GRN WIRE BLK/GRY WIRE BLK/WHT WIRE BLU WIRE BLU/GRN WIRE BLU/RED WIRE BLU/WHT WIRE BLU/YEL WIRE BRN WIRE BRN/BLK WIRE BRN/BLU WIRE BRN/GRN WIRE BRN/RED WIRE BRN/VIO WIRE BRN/WHT WIRE BRN/YEL WIRE CAN-B L CAN-B H BACKUP COMAND COMPUTER DATA LINES SYSTEM CONTROL MODULE BOX BLOWER MOTOR COOL LVL COOLING FANS SYSTEM WIPER/WASHER SYSTEM A/C SYSTEM CPP DIAG DATA LINK CONNECTOR (UNDER LEFT SIDE OF DASH) DI CONTROL MODULE DIAG DLC DLC ECM ECM DLC ENGINE CONTROLS SYSTEM ENGINE CONTROLS SYSTEM TRANSMISSION SYSTEM EXTERIOR LIGHTS SYSTEM WARNING SYSTEMS WARNING SYSTEMS EXTERIOR LIGHTS SYSTEM FRONT SAM CONTROL MODULE W/ FUSE, RELAY MODULE (LEFT REAR OF ENGINE COMPT) GRN WIRE GRN/BLK WIRE GRN/BLU WIRE GRN/GRY WIRE GRN/PNK WIRE GRN/RED WIRE GRN/WHT WIRE GRN/YEL WIRE GRY WIRE GRY/BLK WIRE GRY/BLU WIRE GRY/RED WIRE GRY/VIO WIRE GRY/WHT WIRE GRY/YEL WIRE HEADLIGHTS SYSTEM LAMP SW LAMP SW LAMP SW LAMP SW LAMP SW LF MARK RF MARK BRK LVL PARK BRK MOD COOL PNK WIRE RED/GRY WIRE RED/WHT WIRE RED/YEL WIRE SOUND SYSTEMS TELEPHONE WIRING TRANSMISSION SYSTEM TRANSMISSION SYSTEM COMPUTER DATA LINES SYSTEM VIO WIRE VIO/YEL WIRE WASH LVL WHT WIRE WHT/BLK WIRE WHT/BRN WIRE WHT/GRN WIRE WHT/PNK WIRE WIPER/WASHER SYSTEM 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 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 AMBIENT LIGHT, ROAD AHEAD SENSORS AUTOMATIC LIGHT SWITCH DAYLIGHT SENSOR (FRONT OF HEADLINER) BLK WIRE BLK/GRN WIRE BLK/PNK WIRE BLU WIRE BLU/WHT WIRE BLU/YEL WIRE BRN WIRE BRN/BLU WIRE BRN/GRN WIRE BRN/RED WIRE COMPUTER DATA LINES SYSTEM DIAG EXTERIOR LAMPS FOG LAMP FOG LAMP IND FRONT AXLE SENSOR FRONT PRE-FUSE BOX (RIGHT REAR OF ENGINE COMPT) FRONT SAM CONTROL MODULE W/ FUSE, RELAY MODULE (LEFT REAR OF ENGINE COMPT) FUSE 4 FUSE 50 FUSE 51 FUSE 62 FUSE 63 GRN WIRE GRN/BLK WIRE GRN/PNK WIRE GRN/RED WIRE GRN/WHT WIRE GRN/YEL WIRE GRY WIRE GRY/BLU WIRE GRY/YEL WIRE HEAD AUTO HEADLAMP RANGE ADJUSTMENT MOTOR HEADLAMP WASH HIGH BEAM INDICATOR HIGH XENON BEAM XENON BEAM HOT AT ALL TIMES HOT IN RUN OR START IN OUT INSTRUMENT CLUSTER LAMP SWITCH MODULE LEFT FRONT FOG LAMP LEFT HEADLAMP UNIT LEFT RIGHT MIRROR FOLD- MIRROR SELECT MIRROR ADJUST OVERHEAD CONTROL PANEL CONTROL MODULE PARK OFF REAR AXLE SENSOR RED WIRE RED/GRN WIRE RED/YEL WIRE RIGHT FRONT FOG LAMP RIGHT HEADLAMP UNIT WHT WIRE WHT/BLK WIRE WHT/RED WIRE XENON CONTROL MODULE XENON IGNITION MODULE XENON CONTROL MODULE XENON IGNITION MODULE HIGH XENON BEAM XENON BEAM YEL WIRE YEL/BLK WIRE YEL/WHT WIRE

1 2 3 4 5 6 7 8 9 COIL 4 COIL 3 COIL 2 50 TNA ACCELERATOR PEDAL SENSOR (ABOVE PEDAL ASSEMBLY) BLK WIRE BLK/RED WIRE BLK/WHT WIRE BLU WIRE BLU/BRN WIRE BLU/RED WIRE BLU/YEL WIRE BRN WIRE BRN/BLK WIRE BRN/GRN WIRE BRN/GRY WIRE BRN/ORG WIRE BRN/RED WIRE BRN/VIO WIRE BRN/WHT WIRE BRN/YEL WIRE COIL 1 COMPUTER DATA LINES SYSTEM COOLING FANS SYSTEM CYLINDER IGNITION COILS DATA LINK CONNECTOR DIAG ENGINE CONTROL MODULE (ME-SFI) (LEFT REAR OF ENGINE COMPT) FTP FTP SIG 31 FP FUEL TANK PRESSURE SENSOR (UNDER LEFT REAR SEAT) GRN WIRE GRN/WHT WIRE GRN/YEL WIRE GRY/BLU WIRE GRY/VIO WIRE KICKDWN M/T NCA WIRE PNK/RED WIRE RADIO INTERFERENCE SUPPRESSION CAPACITOR (TOP OF ENGINE) RED/BLU WIRE RED/GRN WIRE TO SPARK PLUGS VIO/GRN WIRE VIO/WHT WIRE VIO/YEL WIRE YEL WIRE YEL/BRN WIRE

ACCELERATOR PEDAL SENSOR (ABOVE PEDAL ASSEMBLY) ACTIVATED CHARCOAL FILTER SHUTOFF VALVE (ABOVE RIGHT REAR WHEELWELL) APS VLV VIMS VLV BLK/RED WIRE BLK/WHT WIRE BLU WIRE BLU/BRN WIRE BLU/RED WIRE BLU/WHT WIRE BLU/YEL WIRE BRN WIRE BRN/BLK WIRE BRN/GRN WIRE BRN/GRY WIRE BRN/VIO WIRE BRN/WHT WIRE BRN/YEL WIRE CLUTCH PEDAL SWITCH FUEL TANK PRESSURE SENSOR (UNDER LEFT REAR SEAT) COMPUTER DATA LINES SYSTEM COOLING FANS SYSTEM DATA LINK CONNECTOR DIAG EGR ENGINE CONTROL MODULE (ME-SFI) (LEFT REAR OF ENGINE COMPT) FTP - CAN L FTP SIG FUEL INJECTORS FUEL PUMP ACF VLV AIR PUMP FAN GEN GENERATOR GRN WIRE GRN/BLU WIRE GRN/VIO WIRE GRN/WHT WIRE GRN/YEL WIRE GRY/BLK WIRE GRY/BLU WIRE GRY/BRN WIRE GRY/GRN WIRE GRY/RED WIRE GRY/VIO WIRE GRY/WHT WIRE GRY/YEL WIRE INJ 5 INJ 2 INJ 6 INJ 3 KICKDOWN SWITCH (INCORPORATED W/ ACCELERATOR PEDAL ASSEMBLY) KICKDWN NCA WIRE P/N RED/BLU WIRE RED/GRN WIRE TNA VARIABLE INTAKE MANIFOLD SWITCHOVER VALVE VIO/GRN WIRE VIO/WHT WIRE VIO/YEL WIRE YEL WIRE YEL/BRN WIRE