2004 AUDI A4

Audi A4 2004 - BUZZERS, RELAYS & TIMERS

Audi A4 2004 BUZZERS, RELAYS & TIMERS LOCATION

Component	Location
Brake Booster Relay	On 9-pin relay carrier. See Fig. 4 .
Coolant Pump Circulation Relay	On E-box relay carrier. See Fig. 3 .
Fuel Pump Relay	On 9-pin relay carrier. See Fig. 4 .
Horn Relay	On 9-pin relay carrier. See Fig. 4 .
Load Reduction Relay	On 9-pin relay carrier. See Fig. 4 .
Motronic Engine Control Module Power Supply Relay	On E-box relay carrier. See Fig. 3 .
Park/Neutral Position Relay (01J A/T)	On E-box relay carrier. See Fig. 3 .
Secondary Air Injection Pump Relay	On E-box relay carrier. See Fig. 3 .
Starter Locking Relay (M/T)	On E-box relay carrier. See Fig. 3 .
Starter Interlock Alarm System Relay (01V A/T)	On E-box relay carrier. See Fig. 3 .

Audi A4 2004 - CIRCUIT PROTECTION DEVICES

Audi A4 2004 CIRCUIT PROTECTION DEVICES LOCATION

Component	Location
E-Box Relay Carrier	In plenum chamber E-box, at left rear of engine compartment.
Fuse Holder	On left end of dash.
Plenum Chamber E-Box (1.8L)	At left rear of engine compartment. See Fig. 1 .
Plenum Chamber E-Box (3.0L)	At left rear of engine compartment. See Fig. 2 .
Rear Shade Circuit Breaker	On 9-pin relay carrier. See Fig. 4 .
3-Pin Relay Carrier	Behind left side of dash.
4-Pin Relay Carrier	Behind left end of dash, to left of fuse holder.
9-Pin Relay Carrier	Behind left side of dash.

Audi A4 2004 - CONTROL UNITS

Audi A4 2004 CONTROL UNITS LOCATION

Component	Location
ABS Control Module	On left side of engine compartment.
Air Bag Control Module	Below center console.
Comfort System Central Control Module	Near base of left front seat, in electronics box.
Convenience System Central Control Module	Near base of left front seat, in electronics box.
Convertible Top Operation Control Module (Convertible)	At right quarterpanel, behind trim.
Coolant Fan Control Module	On top of radiator fan shroud.
Door Control Modules (4)	Integral with respective window regulator motor.
Fresh Air Blower Control Module	Integral with fresh air blower motor, behind right end of dash.
Headlight Range Control Module	Behind glove box.
Heated Windshield Control Module	Near base of windshield.
High Intensity Gas Discharge Lamp Control Module (Left/Right)	On respective headlight assembly.
Interior Monitor Transmitter/Receiver Module 1 (Convertible)	Under rear seat.
Memory Seat Control Module	Under left front seat.
Motronic Engine Control Module	In plenum chamber E-box, at left rear of engine compartment.
Multitronic Transmission Control Module (01J A/T)	On rear of transmission.
Navigation Control Module (W/CD Mechanism)	At left rear of luggage compartment.
Parking Aid Control Module	At left rear of luggage compartment.
Rear Heated Seat Control Module (Left/Right)	In rear of center console, behind respective heated seat switch.
Rear Window Shade Control Module	Under left side of rear shelf.
Servotronic Control Module	On 9-pin relay carrier. See Fig. 4 .
Steering Column Electronic Systems Control Module	In top of steering column.
Telephone/Telematic Control Module	Near base of right front seat, in electronics box.
Throttle Valve Control Module (1.8L)	At left side of engine, on throttle body. See Fig. 1 .
Throttle Valve Control Module (3.0L)	At center rear of engine, on throttle body.
Transmission Control Module (01V A/T)	In plenum chamber E-box, at left rear of engine compartment.
Vehicle Electrical System Control Module	Behind left side of dash, below 9-pin relay carrier.

Audi A4 2004 - MOTORS

Audi A4 2004 MOTORS LOCATION

Component	Location
Airflow Flap Motor	Behind right side of dash, on HVAC assembly.
Brake System Vacuum Pump	On left side of engine compartment. See Fig. 2 .
Central Air Flap Motor	Behind right center of dash, on HVAC assembly.
Convertible Top Operation Hydraulic Unit	At left rear of vehicle.
Defroster Flap Motor	Behind right center of dash, on HVAC assembly.
Front Windshield Wiper Motor	At left rear of engine compartment, above brake master cylinder.
Hydraulic Control Unit	At left front of engine compartment.
Leak Detection Pump	In left rear wheelwell.
Plenum Chamber E-Box Fan	On bottom of E-box, at left rear of engine compartment.
Rear Windshield Wiper Motor	In center rear of liftgate.
Recirculation Flap Motor	Behind right side of dash, on HVAC assembly.
Secondary Air Injection Pump Motor (1.8L)	Behind right headlight assembly. See Fig. 1 .
Secondary Air Injection Pump Motor (3.0L)	Behind right headlight assembly. See Fig. 2 .
Sun Roof Motor	At front center of roof, above interior lights.
Tank Cap Release Motor	On right side of luggage compartment.
Temperature Flap Actuator (Left)	Behind left center of dash, on HVAC assembly.
Temperature Flap Actuator (Right)	Behind right center of dash, on HVAC assembly.
Windshield Washer Pump	On washer fluid reservoir, in front of left front wheelwell.

Audi A4 2004 - SENDING UNITS & SENSORS

Audi A4 2004 SENDING UNITS & SENSORS LOCATION

Component	Location
Accelerator Pedal Position Sender 2	Above accelerator pedal.
A/C High Pressure Sensor	Behind left side of front bumper, on A/C line.
Air Quality Sensor	At right rear of engine compartment, under plenum cover.
Anti-Theft Immobilizer Induction Coil	Surrounding ignition switch, on right side of steering column.
Anti-Theft Warning Ultrasound Sensor	At top center of roof, in interior light assembly.
Brake Booster Pressure Sensor (1.8L)	On right side of brake master cylinder.
Brake Booster Pressure Sensor (3.0L)	On right side of brake master cylinder. See Fig. 2 .
Camshaft Position Sensor (Left Intake) (3.0L)	On rear of left cylinder head. See Fig. 2 .
Camshaft Position Sensor (Right Intake) (3.0L)	On rear of right cylinder head. See Fig. 2 .
Camshaft Position Sensor (1.8L)	On left front of cylinder head. See Fig. 1 .
Camshaft Position Sensor 3 (3.0L)	On rear of right cylinder head. See Fig. 2 .
Camshaft Position Sensor 4 (3.0L)	On rear of left cylinder head. See Fig. 2 .
Charge Air Pressure Sensor (1.8L)	On top of charge air cooler, behind left headlight. See Fig. 1 .
Engine Coolant Temperature Sensor (1.8L)	On rear of cylinder head. See Fig. 1 .
Engine Coolant Temperature Sensor (3.0L)	On coolant line behind right cylinder head.
Engine Speed (RPM) Sensor (1.8L)	On rear of engine. See Fig. 1 .
Engine Speed (RPM) Sensor (3.0L)	On left rear of engine. See Fig. 2 .
Evaporator Vent Temperature Sensor	Behind right side of dash, on HVAC assembly.
Footwell Vent Temperature Sensor (Left/Right)	Below center of dash.
Fresh Air Intake Duct Temperature Sensor	Behind right side of dash, on HVAC assembly.
Front Air Bag Crash Sensor (Driver's/Passenger's)	At respective side of engine compartment, near headlight.
Heated Oxygen Sensors (2) (1.8L)	On exhaust system.
Heated Oxygen Sensors (4) (3.0L)	On exhaust system.
Intake Air Temperature Sensor (1.8L)	On intake manifold, near throttle body. See Fig. 1 .
Knock Sensor 1 (1.8L)	On left rear of engine. See Fig. 1 .
Knock Sensor 1 (3.0L)	Under right side of intake manifold.
Knock Sensor 2 (1.8L)	On left front of engine. See Fig. 1 .
Knock Sensor 2 (3.0L)	Under left side of intake manifold.
Level Control System Sensor (Left Front)	On left front suspension assembly, in wheelwell.
Level Control System Sensor (Left Rear)	On left rear suspension assembly, in wheelwell.
Mass Airflow Sensor (1.8L)	On right side of engine compartment. See Fig. 1 .
Mass Airflow Sensor (3.0L)	At right rear of engine compartment, on air box. See Fig. 2 .
Outside Air Temperature Sensor	At left front of vehicle, near headlight.
Rear Side Air Bag Crash Sensor (Left/Right)	Behind respective outer bolster of rear seat.
Side Air Bag Crash Sensor (Driver's/Passenger's)	Inside base of respective "B" pillar.
Speedometer Vehicle Speed Sensor (M/T)	On left side of transmission, near drive flange.
Speedometer Vehicle Speed Sensor (01J A/T)	Internal to multitronic transmission control module, on rear of transmission.
Speedometer Vehicle Speed Sensor (01V A/T)	On left side of transmission, near drive flange.
Steering Angle Sensor	Behind steering wheel, in column.
Sunlight Photo Sensor	On top center of dash.
Tensioning Bar Position Sensor (Convertible)	On left side of convertible top frame.
Throttle Position Sensor	Above accelerator pedal.
Transverse Acceleration Sensor	Below center of dash.
Vent Temperature Sensor (Left)	Behind left end of dash, in air duct.
Vent Temperature Sensor (Right)	Behind right end of dash, in air duct.

Audi A4 2004 - SOLENOIDS & SOLENOID VALVES

Audi A4 2004 SOLENOIDS & SOLENOID VALVES LOCATION

Component	Location
Evaporative Emission Canister Purge Regulator Valve (1.8L)	At right rear of engine compartment. See Fig. 1 .
Evaporative Emission Canister Purge Regulator Valve (3.0L)	At right rear of engine compartment. See Fig. 2 .
Camshaft Adjustment Valve 1 (Exhaust) (3.0L)	On front of right cylinder head. See Fig. 2 .
Camshaft Adjustment Valve 1 (Intake) (3.0L)	On front of right cylinder head.
Camshaft Adjustment Valve 2 (Exhaust) (3.0L)	On front of left cylinder head. See Fig. 2 .
Camshaft Adjustment Valve 2 (Intake) (3.0L)	On front of left cylinder head.
Intake Manifold Changeover Valve (3.0L)	On front of intake manifold. See Fig. 2 .
Recirculating Valve (Turbocharger) (1.8L)	On bottom of intake manifold. See Fig. 1 .
Secondary Air Injection Solenoid Valve (1.8L)	On bottom of intake manifold.
Secondary Air Injection Solenoid Valve (3.0L)	At top rear of engine.
Shift Lock Solenoid (A/T)	On shift lever assembly.
Wastegate Bypass Regulator Valve (1.8L)	At right front of engine compartment. See Fig. 1 .

Audi A4 2004 - SWITCHES

Audi A4 2004 SWITCHES LOCATION

Component	Location
Ambient Temperature Switch	Behind lower left center of front bumper.
Brake Fluid Level Warning Switch	On brake fluid reservoir.
Brake Light Switch & Brake Vacuum Vent Valve Switch	Above brake pedal, on bracket.
Clutch Vacuum Vent Valve Switch	Above clutch pedal, on bracket.
Convertible Position Switch (Convertible)	On left side of convertible top frame.
Convertible Top Box Lid Locked Switch (Left/Right)	On respective rear side of convertible top box lid, near seat belt retractor.
Convertible Top Box Lid Up Switch	Near right rear of convertible top lid.
Convertible Top Box Pan Position Switch	At rear of convertible top frame.
Hood Contact Switch	At center front of engine compartment.
Multifunction Transmission Range Switch (01V A/T)	On left side of transmission.
Parking Brake Switch	At base of parking brake lever.

Audi A4 2004 - MISCELLANEOUS

Audi A4 2004 MISCELLANEOUS LOCATION

Component	Location
Amplifier	On right side of luggage compartment.
Antenna Splitter	Near base of left front seat, in electronics box.
Battery	At rear of engine compartment, near base of windshield.
Convertible Top Locking Mechanism	At top center of convertible top.
Data Link Connector	Under left side of dash.
Telephone Antenna	Behind right side of front bumper.
Telephone Antenna 2	Behind right side of rear bumper.

Audi A4 2004 - CONNECTORS

Audi A4 2004 CONNECTORS LOCATION

Component	Location
T4K (Black, 4 Pin)	Near front bumper.
T4L (Black, 4 Pin)	In rear lid.
T6K (Black, 6 Pin)	Behind right rear side panel trim.
T8J (Black, 8 Pin)	In rear lid.
T10 (Black, 10 Pin)	In plenum chamber E-box, on connector station.
T10A (Brown, 10 Pin)	In plenum chamber E-box, on connector station.
T10C (Violet, 10 Pin)	Behind left kick panel, on connector station.
T10D (Convertible) (Brown, 10 Pin)	Behind left kick panel, on connector station.
T10D (Sedan/Wagon) (Gray, 10 Pin)	Behind left kick panel, on connector station.
T12D (Brown, 12 Pin)	Near glove box.
T14 (Black, 14 Pin)	On left side of engine compartment.
T17 (Black, 17 Pin)	Behind left kick panel, on connector station.
T17A (Red, 17 Pin)	Behind left kick panel, on connector station.
T17B (Green, 17 Pin)	Behind left kick panel, on connector station.
T17C (Red, 17 Pin)	Behind right kick panel, on connector station.
T17D (Red, 17 Pin)	In plenum chamber E-box, on connector station.
T17E (White, 17 Pin)	In plenum chamber E-box, on connector station.
T17F (Orange, 17 Pin)	Behind left kick panel, on connector station.

Audi A4 2004 - GROUNDS

Audi A4 2004 GROUNDS LOCATION

Component	Location
G3	On right side of engine compartment, above engine mount.
G11	At rear of engine compartment, near battery box.
G12	On left center of firewall, near coolant reservoir.
G18 (1.8L)	At front of engine, near oil filler.
G18 (3.0L)	On front of right valve cover.
G26	On left side of engine compartment, under ABS hydraulic unit.
G32	Behind left kick panel.
G43	Behind right kick panel.
G44	Behind left kick panel.
G50	On left side of luggage compartment.
G73	At center rear of roof.
G77	At base of left "B" pillar.
G78	On base of right "B" pillar.
G610	Under center console, behind shift lever.