Audi A4 B5 facelift (1999-2001) red/yel Wiring diagrams

* - INFORMATION NOT AVAILABLE 8-WAY RELAY CARRIER ABS CONTROL MODULE ABS RETURN FLOW PUMP ABS RETURN FLOW PUMP RELAY ABS SOLENOID VALVE RELAY ABS/EDL HYDRAULIC UNIT (BELOW LEFT SIDE OF REAR SEAT) ANTI-SLIP CONTROL SWITCH BLK WIRE BLK/BLU WIRE BLK/GRN WIRE BRAKE LIGHT SWITCH BRN WIRE BRN/GRN WIRE BRN/RED WIRE COMBINATION PROCESSOR DATA LINK CONNECTOR (UNDER LEFT SIDE OF DASH) FUSE 13 FUSE 53 FUSE 7 FUSE PANEL FWD ONLY GRN WIRE GRN/BLK WIRE GRN/BLU WIRE GRN/BRN WIRE GRN/RED WIRE GRY/BLU WIRE HOT AT ALL TIMES HOT IN ON OR START INSTRUMENT CLUSTER LEFT FRONT ABS INLET VALVE LEFT FRONT ABS OUTLET VALVE LEFT FRONT ABS WHEEL SPEED SENSOR LEFT FRONT BRAKE PAD WEAR SENSOR LEFT FRONT TRACTION CONTROL OUTLET VALVE LEFT FRONT TRACTION CONTROL SWITCH-OVER VALVE LEFT REAR ABS INLET VALVE LEFT REAR ABS OUTLET VALVE LEFT REAR ABS WHEEL SPEED SENSOR MOTRONIC ENGINE CONTROL MODULE (NEAR BRAKE BOOSTER IN PROTECTIVE CASE) RED WIRE RED/BLK WIRE RED/BRN WIRE RED/YEL WIRE RIGHT FRONT ABS INLET VALVE RIGHT FRONT ABS OUTLET VALVE RIGHT FRONT ABS WHEEL SPEED SENSOR RIGHT FRONT BRAKE PAD WEAR SENSOR RIGHT FRONT TRACTION CONTROL OUTLET VALVE RIGHT FRONT TRACTION CONTROL SWITCH-OVER VALVE RIGHT REAR ABS INLET VALVE RIGHT REAR ABS OUTLET VALVE RIGHT REAR ABS WHEEL SPEED SENSOR TRACTION CONTROL IND TRANSMISSION CONTROL MODULE (UNDER CARPET, FORWARD OF PASSENGER'S SEAT) VIO/BLK WIRE W/ ANTI-SLIP CONTROL W/ ANTI-SLIP CONTROL OR QUATTRO W/ ANTI-SLIP CONTROL FWD ONLY W/ ANTI-SLIP CONTROL W/ ANTI-SLIP CONTROL WHT WIRE WHT/BLK WIRE WHT/BRN WIRE YEL WIRE YEL/BLU WIRE YEL/RED WIRE

AUTO CHECK SYSTEM BLK WIRE BLK/RED WIRE BLU WIRE BLU/YEL WIRE BOARD COMPUTER FUNCTION SELECTOR SWITCH BRAKE- LIGHT SWITCH (ABOVE BRAKE PEDAL, ABOVE BRACKET) BRN WIRE BRN/GRN WIRE BRN/RED WIRE BRN/VIO WIRE BRN/WHT WIRE FUSE 13 FUSE 5 FUSE PANEL GRN WIRE GRN/GRY WIRE GRN/VIO WIRE GRY WIRE GRY/BLK WIRE GRY/BLU WIRE GRY/RED WIRE GRY/WHT WIRE GRY/YEL WIRE HEADLIGHTS SYSTEM HOT AT ALL TIMES HOT IN START OR RUN INSTRUMENT CLUSTER LEFT REAR DOOR CONTACT SWITCH NAVIGATION CONTROL MODULE PASSENGER'S SIDE DOOR CONTACT SWITCH RADIO REAR LIGHT CONTROL MODULE (ON 13-FOLD RELAY CARRIER, POSITIONS 4, 5) RED WIRE RED/BLK WIRE RED/BRN WIRE RED/VIO WIRE RED/WHT WIRE RED/YEL WIRE RIGHT REAR DOOR CONTACT SWITCH TRIP COMPUTER FUNCTION SELECT SWITCH TRIP COMPUTER RESET BUTTON WASHER FLUID LEVEL WARNING SWITCH WHT/BRN WIRE YEL WIRE YEL/BLK WIRE YEL/BRN WIRE YEL/GRN WIRE YEL/WHT WIRE

A/C CONTROL HEAD BLK/BLU WIRE BLK/GRY WIRE BLK/RED WIRE BLK/VIO WIRE BLK/WHT WIRE BLK/YEL WIRE BLU/ BLK WIRE BLU/VIO WIRE BRN WIRE BRN/BLK WIRE BRN/BLU WIRE BRN/GRN WIRE BRN/RED WIRE BRN/WHT WIRE BRN/YEL WIRE CENTER OUTLET TEMPERATURE SENDER (BEHIND LOWER CENTER OF DASH, ON HVAC UNIT) FLOOR OUTLET TEMPERATURE SENDER (BEHIND LOWER LEFT CENTER OF DASH, ON HVAC UNIT) FUSE 225 FUSE 3 FUSE 5 FUSE PANEL (ON LEFT END OF DASH) GRN GRY/ WIRE GRN WIRE GRN/BLK WIRE GRN/BLU WIRE GRN/BRN WIRE GRN/GRN WIRE GRN/RED WIRE GRN/VIO WIRE GRY WIRE GRY/ GRN WIRE GRY/BLU WIRE GRY/RED WIRE GRY/WHT WIRE GRY/YEL WIRE HOT IN RUN OR START HOT W/LIGHT SWITCH IN PARK OR HEAD POSITION HOT W/LOAD REDUCTION RELAY ENERGIZED INSTRUMENT CLUSTER MOTRONIC ENGINE CONTROL MODULE (ECM) (NEAR BRAKE BOOSTER, IN PROTECTIVE CASE) RED/ BLK WIRE RED/YEL WIRE SOLID STATE WHT/BLU WIRE WHT/GRN WIRE WHT/GRY WIRE WHT/RED WIRE WHT/VIO WIRE WHT/YEL WIRE WIPER/WASHER SYSTEM YEL WIRE YEL/BLU WIRE YEL/WHT WIRE

BLK WIRE BLK/WHT WIRE BLU WIRE BRAKE LIGHT SWITCH BRN WIRE BRN/GRN WIRE BRN/RED WIRE BRN/VIO WIRE CLUTCH VACUUM VENT VALVE SWITCH (ABOVE CLUTCH PEDAL, ON BRACKET) CRUISE CONTROL SWITCH FUSE FUSE 7 FUSE PANEL (ON LEFT END OF DASH) GRN WIRE GRN/VIO (OR BRN/RED) WIRE GRY WIRE GRY/WHT (OR GRY/BRN, OR GRN/RED) WIRE GRY/YEL WIRE HOT IN RUN OR START MOTRONIC ENGINE CONTROL MODULE (NEAR BRAKE BOOSTER IN PROTECTIVE CASE) RED WIRE RED/GRN WIRE RED/GRY WIRE RED/VIO WIRE RED/YEL WIRE THROTTLE POSITION (TP) SENSOR (ON THROTTLE BODY) THROTTLE VALVE CONTROL MODULE (ON REAR OF ENG, ON INTAKE MANIFOLD) VIO/RED (OR BLK/GRY) WIRE WHT WIRE WHT/RED WIRE WHT/YEL (OR VIO/YEL, OR BLK/BRN) WIRE YEL WIRE YEL/BLU WIRE YEL/VIO WIRE

13-WAY RELAY CARRIER (BEHIND LEFT SIDE OF DASH) 5 5 6 1 1 2 (AVANT) 6 2 (AVANT) AUTO CHECK SYSTEM (PART OF INSTRUMENT CLUSTER) AVANT BLK WIRE BLK/GRN WIRE BLK/RED WIRE BLK/YEL WIRE BLU WIRE BRAKE LIGHT SWITCH BRN WIRE COMBINATION PROCESSOR DAYTIME RUNNING LIGHTS SWITCH-ON RELAY EMERGENCY FLASHER SWITCH FUSE FUSE 2 FUSE FUSE FUSE PANEL (LEFT END OF DASH) FUSE GRN WIRE GRY WIRE GRY/BLK WIRE GRY/GRN WIRE GRY/RED WIRE GRY/WHT WIRE GRY/YEL WIRE HEAD HEAD PARK HIGH MOUNT BRAKE LIGHT HOT AT ALL TIMES HOT IN RUN OR START HOT W/ LOAD REDUCTION RELAY ENERGIZED HOT W/ LOAD REDUCTION RELAY ENERGIZED HOT AT ALL TIMES INSTRUMENT CLUSTER INSTRUMENT CLUSTER SYSTEM (WITH TRAILER OPTION) INTERIOR LIGHTS SYSTEM LEFT FRONT PARK/TURN LIGHT LEFT SIDE TURN SIGNAL LIGHT LEFT TAILLAMP ASSEMBLY 4 6 INSTRUMENT CLUSTER (AVANT) LEFT TURN IND PARK TURN LICENSE PLATE LIGHTS LIGHT SWITCH MICRO CENTRAL ELECTRIC OFF PARK REAR LIGHT CONTROL MODULE (ON 13-WAY RELAY CARRIER) RED WIRE RED/BLK WIRE RED/WHT WIRE RED/YEL WIRE RIGHT FRONT PARK/TURN LIGHT RIGHT SIDE TURN SIGNAL LIGHT RIGHT TAILLAMP ASSEMBLY 3 6 (AVANT) RIGHT TURN IND TURN TAIL STOP TAIL STOP TURN TURN PARK TURN SIGNAL SWITCH VIO WIRE WHT WIRE YEL WIRE

13-WAY RELAY CARRIER (BEHIND LEFT SIDE OF DASH) 5 5 6 1 1 2 (AVANT) 6 2 (AVANT) AVANT BLK WIRE BLK/GRN WIRE BLU WIRE BRAKE LIGHT SWITCH BRN WIRE COMBINATION PROCESSOR DAYTIME RUNNING LIGHTS SWITCH-ON RELAY EMERGENCY FLASHER SWITCH FUSE FUSE 2 FUSE FUSE FUSE PANEL (LEFT END OF DASH) FUSE PANEL (LEFT END OF DASH) FUSE GRN WIRE GRY WIRE GRY/BLK WIRE GRY/GRN WIRE GRY/RED WIRE GRY/YEL WIRE HEAD HEAD PARK HIGH MOUNT BRAKE LIGHT HOT AT ALL TIMES HOT W/ LOAD REDUCTION RELAY ENERGIZED INSTRUMENT CLUSTER INSTRUMENT CLUSTER SYSTEM (WITH TRAILER OPTION) LEFT FRONT PARK/TURN LIGHT LEFT RIGHT TURN IND TURN IND TURN LEFT SIDE TURN SIGNAL LIGHT LEFT TAILLAMP ASSEMBLY 4 6 (AVANT) LICENSE PLATE LIGHTS LIGHT SWITCH MICRO CENTRAL ELECTRIC OFF OFF PARK PARK RED WIRE RED/BLK WIRE RED/YEL WIRE RIGHT FRONT PARK/TURN LIGHT INSTRUMENT CLUSTER RIGHT SIDE TURN SIGNAL LIGHT RIGHT TAILLAMP ASSEMBLY 3 6 (AVANT) TAIL STOP TURN TURN PARK TURN SIGNAL SWITCH TURN TAIL STOP VIO WIRE VIO/BLU WIRE WHT WIRE YEL WIRE

5 5 6 1 1 2 (AVANT) 6 2 (AVANT) AUTO CHECK SYSTEM (PART OF INSTRUMENT CLUSTER) AVANT BLK WIRE BLK/GRN WIRE BLK/RED WIRE BLU WIRE BRAKE LIGHT SWITCH BRN WIRE COMBINATION PROCESSOR EMERGENCY FLASHER SWITCH FUSE FUSE 2 FUSE FUSE FUSE PANEL (LEFT END OF DASH) FUSE GRN WIRE GRY WIRE GRY/BLK WIRE GRY/GRN WIRE GRY/RED WIRE GRY/WHT WIRE GRY/YEL WIRE HEAD HEAD PARK HIGH MOUNT BRAKE LIGHT HOT AT ALL TIMES HOT AT ALL TIMES MICRO CENTRAL ELECTRIC HOT IN RUN OR START HOT W/ LOAD REDUCTION RELAY ENERGIZED INSTRUMENT CLUSTER INSTRUMENT CLUSTER SYSTEM (WITH TRAILER OPTION) LEFT FRONT PARK/TURN LIGHT LEFT SIDE TURN SIGNAL LIGHT LEFT TAILLAMP ASSEMBLY 4 6 INSTRUMENT CLUSTER (AVANT) LEFT TURN IND PARK TURN LICENSE PLATE LIGHTS LIGHT SWITCH OFF OFF PARK REAR LIGHT CONTROL MODULE (ON 13-WAY RELAY CARRIER) RED WIRE RED/BLK WIRE RED/WHT WIRE RED/YEL WIRE RIGHT FRONT PARK/TURN LIGHT RIGHT SIDE TURN SIGNAL LIGHT RIGHT TAILLAMP ASSEMBLY 3 6 (AVANT) RIGHT TURN IND TURN TAIL STOP TAIL STOP TURN TURN PARK TURN SIGNAL SWITCH VIO WIRE WHT WIRE YEL WIRE

5 5 6 1 1 2 (AVANT) 6 2 (AVANT) AVANT BLK WIRE BLK/GRN WIRE BLU WIRE BRAKE LIGHT SWITCH BRN WIRE COMBINATION PROCESSOR EMERGENCY FLASHER SWITCH FUSE FUSE 2 FUSE FUSE FUSE PANEL (LEFT END OF DASH) FUSE GRN WIRE GRY WIRE GRY/BLK WIRE GRY/GRN WIRE GRY/RED WIRE GRY/YEL WIRE HEAD HEAD PARK HIGH MOUNT BRAKE LIGHT HOT AT ALL TIMES HOT AT ALL TIMES MICRO CENTRAL ELECTRIC HOT W/ LOAD REDUCTION RELAY ENERGIZED INSTRUMENT CLUSTER INSTRUMENT CLUSTER SYSTEM (WITH TRAILER OPTION) LEFT FRONT PARK/TURN LIGHT LEFT RIGHT TURN IND TURN IND TURN LEFT SIDE TURN SIGNAL LIGHT LEFT TAILLAMP ASSEMBLY 4 6 (AVANT) LICENSE PLATE LIGHTS LIGHT SWITCH OFF OFF PARK PARK RED WIRE RED/BLK WIRE RED/YEL WIRE RIGHT FRONT PARK/TURN LIGHT INSTRUMENT CLUSTER RIGHT SIDE TURN SIGNAL LIGHT RIGHT TAILLAMP ASSEMBLY 3 6 (AVANT) TAIL STOP TURN TURN PARK TURN SIGNAL SWITCH TURN TAIL STOP VIO WIRE VIO/BLU WIRE WHT WIRE YEL WIRE

3-WAY RELAY CARRIER A/C SYSTEM ABS SYSTEM, TRANSMISSIONS SYSTEM, INSTRUMENT CLUSTER SYSTEM BLK WIRE BLK/BLU WIRE BLK/GRN WIRE BLK/GRY WIRE BLK/VIO WIRE BLK/WHT WIRE BLK/YEL WIRE BLU/GRY WIRE BRAKE LIGHT SWITCH (ABOVE BRAKE PEDAL, ON BRACKET) BRN WIRE BRN/GRN WIRE BRN/RED WIRE CLUTCH VACUUM VENT VALVE SWITCH (ABOVE CLUTCH, ON BRACKET) CRUISE CONTROL SYSTEM FUSE 13 FUSE 130 FUSE 7 FUSE PANEL GRN WIRE GRN/BLK WIRE GRN/BLU WIRE GRN/RED WIRE GRN/YEL WIRE GRY WIRE GRY/YEL WIRE GYR/YEL WIRE HEATED OXYGEN SENSOR 1 (RIGHT SIDE OF ENG, ON EXHAUST MANIFOLD) HEATED OXYGEN SENSOR 2 (BEHIND 3-WAY CATALYTIC CONVERTER) HOT AT ALL TIMES HOT IN START OR RUN M/T MASS AIRFLOW (MAF) SENSOR (INSIDE AIR CLEANER HOUSING) MICRO CENTER ELECTRONIC SECONDARY AIR INJECTION (AIR) PUMP RELAY MOTRONIC ENGINE CONTROL MODULE (NEAR BRAKE BOOSTER IN PROTECTIVE CASE) NCA WIRE RED WIRE RED/BLK WIRE RED/BRN WIRE RED/GRN WIRE RED/WHT WIRE RED/YEL WIRE SECONDARY AIR INJECTION PUMP MOTOR (LOWER RIGHT FRONT CORNER OF ENG COMPT) THROTTLE POSITION (TP) SENSOR (ON THROTTLE BODY) VIO WIRE WHT WIRE WHT/BLK WIRE WHT/BLU WIRE WHT/GRY WIRE WHT/RED WIRE YEL WIRE YEL/BLU WIRE YEL/BRN WIRE YEL/GRN WIRE YEL/RED WIRE YEL/VIO WIRE

A/C SYSTEM BACK-UP LIGHT SWITCH BLK WIRE BLK/BLU WIRE BLK/GRY WIRE BLK/VIO WIRE BLK/WHT WIRE BLK/YEL WIRE BLU WIRE BLU/GRN WIRE BLU/GRY WIRE BRAKE LIGHT SWITCH (ABOVE BRAKE PEDAL, ON BRACKET) BRN WIRE BRN/BLK WIRE BRN/GRN WIRE BRN/RED WIRE CLUTCH VACUUM VENT VALVE SWITCH (ABOVE CLUTCH PEDAL, ON BRACKET) CRUISE CONTROL SYSTEM FUSE 13 FUSE 7 FUSE PANEL FUSE 231 GRN WIRE GRN/BLK WIRE GRN/BLU WIRE GRN/RED WIRE GRN/YEL WIRE GRY WIRE GRY/YEL WIRE GYR/YEL WIRE HEATED OXYGEN SENSOR 1 (BEHIND RIGHT CYLINDER HEAD, ON EXHAUST MANIFOLD) HEATED OXYGEN SENSOR 2 (BEHIND RIGHT CYLINDER HEAD, ON EXHAUST MANIFOLD) HOT AT ALL TIMES IGNITION SWITCH INSTRUMENT CLUSTER SYSTEM M/T MASS AIRFLOW (MAF) SENSOR (IN AIR CLEANER ASSEMBLY) MOTRONIC ENGINE CONTROL MODULE (NEAR BRAKE BOOSTER IN PROTECTIVE CASE) NCA WIRE OFF OXYGEN SENSOR 1 (BEHIND 3-WAY CATALYTIC CONVERTER) OXYGEN SENSOR 2 (BEHIND 3-WAY CATALYTIC CONVERTER) RED WIRE RED/BLK WIRE RED/BRN WIRE RED/GRN WIRE RED/WHT WIRE RED/YEL WIRE RUN WIRE THROTTLE POSITION (TP) SENSOR (ON THROTTLE BODY) VIO WIRE WHT WIRE WHT/BLU WIRE WHT/RED WIRE YEL WIRE YEL/BLU WIRE YEL/BRN WIRE YEL/GRN WIRE YEL/RED WIRE YEL/VIO WIRE