Audi A4 B6 (2000-2006) (left center of firewall) Wiring diagrams

BLK WIRE BLK/BLU WIRE BLK/RED WIRE BLU WIRE BLU/GRY WIRE BLU/RED WIRE BRN WIRE BRN/GRN WIRE BRN/YEL WIRE COMPUTER DATA LINES SYSTEM DATA LINK CONNECTOR (BELOW LEFT SIDE OF DASH) EXTERIOR LIGHTS SYSTEM (BACKUP) FUSE 31 FUSE 5 FUSE 88 FUSE HOLDER (LEFT END OF DASH) FUSE STRIP (MAIN FUSE) GRN WIRE GRN/GRY WIRE GRN/RED WIRE GRN/VIO WIRE GRN/WHT WIRE GRY WIRE GRY/BRN WIRE GRY/WHT WIRE GRY/YEL WIRE HOT AT ALL TIMES IGNITION SWITCH INSTRUMENT CLUSTER MULTIFUNCTION TRANSMISSION RANGE SWITCH (LEFT SIDE OF TRANSMISSION) OFF ORG/BLK WIRE ORG/BRN WIRE PRESSURE CONTROL VALVES RED WIRE RED/GRN WIRE RUN WIRE SOLENOID VALVES STARTING SYSTEM (INTERLOCK RELAY) TRANSMISSION FLUID TEMPERATURE SENSOR TRANSMISSION OUTPUT SPEED SENSOR (ON TRANS HOUSING) TRANSMISSION SPEED SENSOR (ON TRANS HOUSING) VALVE BODY VIO WIRE VIO/WHT WIRE WHT WIRE WHT/BRN WIRE WHT/GRN WIRE YEL WIRE YEL/RED WIRE YEL/WHT WIRE

AIR CONDITIONING CONTROLS AIR FLOW FLAP MOTOR/ POSITION SENSOR AIR QUALITY SENSOR (RIGHT REAR OF ENG COMPT) AIRBAG SPIRAL SPRING/ RETURN SPRING W/ SLIP RING B+ B- BLK WIRE BLK/GRN WIRE BLU/RED WIRE BRN WIRE BRN/BLK WIRE BRN/BLU WIRE BRN/VIO WIRE BRN/WHT (OR BRN) WIRE BRN/WHT WIRE CENTRAL AIR FLAP MOTOR/ POSITION SENSOR COMPUTER DATA LINES SYSTEM DEFROSTER FLAP MOTOR, POSITION SENSOR EVAPORATOR VENT TEMPERATURE SENSOR (BEHIND RIGHT END OF DASH) FRESH AIR INTAKE DUCT TEMPERATURE SENSOR (BEHIND RIGHT END OF DASH) GRY WIRE GRY/BLK WIRE GRY/GRN WIRE GRY/RED WIRE GRY/WHT WIRE GRY/YEL WIRE HEATED FRONT WINDOW HIGH PRESSURE SENSOR LEFT FOOTWELL VENT TEMPERATURE SENSOR (BELOW CENTER OF DASH) LEFT TEMPERATURE FLAP ACTUATOR/ POTENTIOMETER ORG/BRN WIRE ORG/GRN WIRE RECIRCULATION FLAP MOTOR, POSITION SENSOR RED WIRE RED/BLU WIRE RED/YEL WIRE RIGHT FOOTWELL VENT TEMPERATURE SENSOR (BELOW CENTER OF DASH) RIGHT TEMPERATURE FLAP ACTUATOR/ POTENTIOMETER STEERING COLUMN ELECTRONIC SYSTEMS CONTROL MODULE (AT TOP OF STEERING COLUMN) STEERING WHEEL CONTROL UNIT SUNLIGHT PHOTO SENSOR (ON TOP CENTER OF DASH) WHT/GRN WIRE WHT/YEL WIRE WINDSHIELD HEATING VOLTAGE CONVERTER (IF EQUIPPED) YEL/BLK WIRE

1 3 RADIO FREQUENCY CONTROLLED CLOCK RECEIVER (IF EQUIPPED) ABS CONTROL MODULE (ON LEFT SIDE OF ENGINE COMPARTMENT) AIR BAG MIL AIRBAG CONTROL MODULE (BELOW CENTER CONSOLE) AMBIENT TEMPERATURE SWITCH (BEHIND LOWER LEFT CENTER OF FRONT BUMPER) ANTI-LOCK BRAKES SYSTEM ANTI-LOCK BRAKES SYSTEM COMPUTER DATA LINES SYSTEM ANTI-THEFT IMMOBILZER INDUCTION COIL ANTI-THEFT SYSTEM BLK WIRE BLK/RED WIRE BLU WIRE BLU/BRN WIRE BLU/WHT WIRE BLU/YEL WIRE BOARD COMPUTER FUNCTION SELECTOR SWITCH II BRAKE FLUID LEVEL WARNING SWITCH (ON BRAKE FLUID RESERVOIR) BRN WIRE BRN/GRN WIRE BRN/RED WIRE BRN/VIO WIRE BRN/WHT WIRE BRN/YEL WIRE BUZZER CLOCK COMPUTER DATA LINES SYSTEM CONTROL MODULE FOR NAVIGATION W/ CD- MECHANISM DRIVER'S SEAT CONTACT STRIP ECT GAUGE ENGINE COOLANT LEVEL (ECL) WARNING SWITCH ENGINE COOLANT TEMPERATURE (ECT) SENSOR FUEL GAUGE FUEL GAUGE GAUGE SENDER FUEL LEVEL SENSOR 2 (QUATTRO ONLY) FUEL TANK LOCK SWITCH (IF EQUIPPED) FUSE 15 FUSE 5 FUSE HOLDER (LEFT END OF DASH) GEN WARN IND GRN WIRE GRN/GRY WIRE GRN/RED WIRE GRN/VIO WIRE GRY WIRE GRY/BLK WIRE GRY/BLU WIRE GRY/YEL WIRE HEADLIGHT RANGE CONTROL MODULE (BEHIND GLOVE BOX) HOT AT ALL TIMES HOT IN RUN OR START IGNITION SWITCH INSTRUMENT CLUSTER KEY SWITCH OFF OIL LEVEL THERMAL SENSOR OIL PRESSURE SWITCH ORG/ WIRE ORG/BLK WIRE ORG/BRN WIRE ORG/GRN WIRE ORG/VIO WIRE RADIO RED WIRE RED/BLU WIRE RED/GRN WIRE RED/GRY WIRE RUN WIRE SPEEDO- METER STARTING/CHARGING SYSTEM STEERING COLUMN ELECTRONIC SYSTEMS CONTROL MODULE (IN TOP OF STEERING COLUMN) SUPPLEMENTAL RESTRAINTS SYSTEM TACHO- METER TELEPHONE/ TELEMATIC CONTROL MODULE TIPTRONIC SWITCH TRANSMISSION CONTROL MODULE (LEFT REAR OF ENG COMPT) (W/O CVT) VIO WIRE VIO/BLK WIRE WARNINGS SYSTEM WHT WIRE WHT/BRN WIRE WHT/GRY WIRE WHT/YEL WIRE WINDSHIELD WASHER FLUID LEVEL WARNING SWITCH YEL WIRE YEL/BLU WIRE YEL/GRN WIRE YEL/GRY WIRE YEL/WHT WIRE

ACCELERATOR PEDAL POSITION (APP) SENSOR (ABOVE ACCELERATOR PEDAL) BLK WIRE BLK/BRN WIRE BLK/VIO WIRE BLK/WHT WIRE BLU WIRE BLU/BLK WIRE BLU/GRN WIRE BLU/GRY WIRE BLU/WHT WIRE BRAKE LIGHT SWITCH BRN WIRE BRN/GRN WIRE BRN/RED WIRE CLUTCH VACUUM VENT VALVE SWITCH (M/T) (ABOVE CLUTCH PEDAL) COOLING FANS SYSTEM FUSE 14 FUSE 30 FUSE 43 FUSE HOLDER FUSE 7 (LEFT END OF DASH) GRN WIRE GRN/BLU WIRE GRN/GRY WIRE GRN/RED WIRE GRN/YEL WIRE GRY WIRE GRY/GRN WIRE GRY/RED WIRE GRY/YEL WIRE HEATED OXYGEN SENSOR (ON EXHAUST SYSTEM) HOT AT ALL TIMES HOT IN RUN OR START IGNITION SWITCH MASS AIRFLOW (MAF) SENSOR (RIGHT SIDE OF ENGINE COMPT) MOTRONIC ENGINE CONTROL MODULE (IN PLENUM CHAMBER E-BOX) OFF ORG/BLK WIRE ORG/BRN WIRE OXYGEN SENSOR BEHIND TWC RED WIRE RED/BLK WIRE RED/GRN WIRE RED/WHT WIRE RUN WIRE SECONDARY AIR INJECTION (AIR) PUMP RELAY SECONDARY AIR INJECTION PUMP MOTOR STEERING COLUMN ELECTRONIC SYSTEMS CONTROL MODULE (TOP OF STEERING COLUMN) TRANSMISSION CONTROL MODULE (W/ CVT) (IN PLENUM CHAMBER E-BOX) GENERATOR VIO WIRE WHT WIRE WHT/BLK WIRE WHT/GRN WIRE WHT/GRY WIRE WHT/RED WIRE WHT/YEL WIRE YEL WIRE YEL/BLK WIRE YEL/BLU WIRE YEL/GRN WIRE YEL/VIO WIRE

BLK WIRE BLK/RED WIRE BLK/WHT WIRE BLU WIRE BLU/BLK WIRE BLU/GRY WIRE BRN WIRE BRN/BLK WIRE BRN/GRN WIRE BRN/GRY WIRE BRN/YEL WIRE CAMSHAFT ADJUSTMENT VALVE 1 CAMSHAFT POSITION SENSOR (LEFT FRONT OF CYLINDER HEAD) COIL COMPUTER DATA LINES SYSTEM DATA LINK CONNECTOR FUSE 82 FUSE HOLDER (LEFT END OF DASH) FUSE 29 GRN WIRE GRN/BLU WIRE GRN/BRN WIRE GRN/GRY WIRE GRN/RED WIRE GRN/YEL WIRE GRY WIRE GRY/BLK WIRE GRY/BLU WIRE GRY/BRN WIRE GRY/GRN WIRE GRY/YEL WIRE INSTRUMENT CLUSTER INTAKE AIR TEMPERATURE SENSOR (NEAR THROTTLE BODY) MALFUNCTION INDICATOR LAMP NCA WIRE ORG/BLK WIRE ORG/BRN WIRE RED WIRE RED/BLU WIRE RED/GRN WIRE RED/GRY WIRE TO SPARK PLUG VIO WIRE WHT WIRE WHT/BLK WIRE WHT/GRY WIRE WHT/YEL WIRE YEL WIRE YEL/GRY WIRE YEL/VIO WIRE YEL/WHT WIRE

BLK WIRE BLK/BRN WIRE BLK/VIO WIRE BLK/WHT WIRE BLU WIRE BLU/GRN WIRE BLU/GRY WIRE BRAKE LIGHT SWITCH BRN WIRE BRN/BLK WIRE BRN/GRN WIRE BRN/GRY WIRE BRN/RED WIRE CLUTCH VACUUM VENT VALVE SWITCH (M/T) FUSE 30 FUSE 43 FUSE 7 FUSE HOLDER (LEFT END OF DASH) FUSE 14 GRN WIRE GRN/BLU WIRE GRN/GRY WIRE GRN/RED WIRE GRN/WHT WIRE GRN/YEL WIRE GRY WIRE GRY/BLU WIRE GRY/GRN WIRE GRY/RED WIRE GRY/YEL WIRE HEATED OXYGEN SENSOR (ON EXHAUST SYSTEM) HEATED OXYGEN SENSOR 2 (ON EXHAUST SYSTEM) HOT AT ALL TIMES HOT IN RUN OR START IGNITION SWITCH MASS AIRFLOW (MAF) SENSOR (RIGHT REAR OF ENGINE COMPT) MOTRONIC ENGINE CONTROL MODULE (LEFT REAR OF ENGINE COMPT) OFF ORG/BLK WIRE ORG/BRN WIRE OXYGEN SENSOR 2 (BEHIND TWC) OXYGEN SENSOR BEHIND TWC RED WIRE RED/BLK WIRE RED/BRN WIRE RED/GRN WIRE RED/WHT WIRE RUN WIRE SECONDARY AIR INJECTION (AIR) PUMP RELAY SECONDARY AIR INJECTION PUMP MOTOR STEERING COLUMN ELECTRONIC SYSTEMS CONTROL MODULE (TOP OF STEERING COLUMN) THROTTLE POSITION (TP) SENSOR (ABOVE ACCELERATOR SENSOR) TRANS- MISSION CONTROL MODULE (W/CVT) (LEFT REAR OF ENGINE COMPT) VIO WIRE VIO/YEL WIRE WHT WIRE WHT/BLK WIRE WHT/RED WIRE YEL WIRE YEL/BLK WIRE YEL/BLU WIRE YEL/GRN WIRE YEL/VIO WIRE YEL/WHT WIRE

BLK WIRE BLK/WHT WIRE BLU WIRE BLU/BLK WIRE BRN WIRE BRN/BLK WIRE BRN/GRN WIRE BRN/GRY WIRE CAMSHAFT POSITION SENSOR 2 CAMSHAFT POSITION SENSOR 4 (REAR OF LEFT CYLINDER HEAD) ENGINE SPEED (RPM) SENSOR (LEFT REAR OF ENGINE) FUSE HOLDER (LEFT END OF DASH) FUSE 9 GRN WIRE GRN/BRN WIRE GRN/RED WIRE GRN/WHT WIRE GRN/YEL WIRE GRY WIRE GRY/BLU WIRE GRY/RED WIRE HOT AT ALL TIMES KNOCK SENSOR (KS) 1 (UNDER RIGHT SIDE OF INTAKE) KNOCK SENSOR (KS) 2 (UNDER LEFT SIDE OF INTAKE) LEAK DETECTION PUMP (LDP) (LEFT REAR WHEELWELL) NCA WIRE ORG/BLK WIRE ORG/BRN WIRE RED WIRE RED/BLK WIRE RED/BLU WIRE RED/GRN WIRE SECONDARY AIR INJECTION (AIR) SOLENOID VALVE (TOP LEFT REAR OF ENGINE) VIO WIRE WHT WIRE WHT/BLK WIRE YEL WIRE YEL/GRN WIRE YEL/VIO WIRE YEL/WHT WIRE

BLK WIRE BLK/WHT WIRE BLU WIRE BLU/BLK WIRE BRN WIRE BRN/BLK WIRE BRN/BLU WIRE BRN/GRN WIRE BRN/GRY WIRE BRN/YEL WIRE CAMSHAFT POSITION SENSOR CAMSHAFT POSITION SENSOR 3 COIL COMPUTER DATA LINES SYSTEM FUSE 82 FUSE HOLDER (LEFT END OF DASH) FUSE 29 GRN WIRE GRN/BLK WIRE GRN/BRN WIRE GRN/GRY WIRE GRN/RED WIRE GRN/VIO WIRE GRN/YEL WIRE GRY WIRE GRY/BRN WIRE GRY/YEL WIRE INSTRUMENT CLUSTER MALFUNCTION INDICATOR LAMP NCA WIRE ORG/BLK WIRE ORG/BRN WIRE RED WIRE RED/BLK WIRE RED/BLU WIRE RED/GRN WIRE RED/GRY WIRE TO SPARK PLUG VIO WIRE WHT WIRE WHT/BLK WIRE WHT/BRN WIRE WHT/GRN WIRE WHT/YEL WIRE YEL WIRE YEL/GRN WIRE YEL/VIO WIRE