2009 AUDI A3

Audi A3 2009 - BUZZERS, RELAYS & TIMERS

Audi A3 2009 BUZZERS, RELAYS & TIMERS LOCATION

Component	Location
Coolant Circulation Pump Relay (R2)	On fuse panel "B". See Fig. 4.
Dual Washer Pump Relay 1 (B8)	On relay carrier. See Fig. 2.
Dual Washer Pump Relay 2 (B7)	On relay carrier. See Fig. 2.
Engine Component Power Supply Relay (Engine Code CBFA) (5.2)	On 5-position fuse/relay carrier. See Fig. 1.
Engine Component Power Supply Relay (R4)	On fuse panel "B". See Fig. 4.
Fuel Pump (FP) Relay (2.0L) (5.2)	On 5-position fuse/relay carrier. See Fig. 1.
Fuel Pump (FP) Relay (3.2L) (20)	Rear of engine. See Fig. 128.
Headlight Washer Relay (1)	On 5-position fuse/relay carrier. See Fig. 1.
Heated Seat Relay (SHZG)	On relay carrier. See Fig. 2.
Horn Relay (B6)	On relay carrier. See Fig. 2.
Load Reduction Relay (B9)	On relay carrier. See Fig. 2.
Motronic Engine Control Module (ECM) Power Supply Relay (2.0L) (R1)	On fuse panel "B". See Fig. 4.
Motronic Engine Control Module (ECM) Power Supply Relay (3.2L) (19)	Rear of engine. See Fig. 128.
Power Supply Relay (Terminal 50) (4)	On 5-position fuse/relay carrier. See Fig. 1.
Power Supply Relay 2 (Terminal 15) (B1)	On relay carrier. See Fig. 2.
Power Supply Relay 2 (Terminal 30, B+) (B4)	On relay carrier. See Fig. 2.
Rear Window Defogger Relay (B5)	On relay carrier. See Fig. 2.
Secondary Air Injection (AIR) Pump Relay (18)	Rear of engine. See Fig. 128.

Audi A3 2009 - CIRCUIT PROTECTION DEVICES

Audi A3 2009 CIRCUIT PROTECTION DEVICES LOCATION

Component	Location
Fuse Panel "B"	Integrated in engine compartment E-box.
Main Fuse Panel "D"	Right rear of luggage compartment.
Relay Carrier	Integrated in J519 vehicle electrical system control module.
5-Position Fuse/Relay Carrier	Under left side of dash. See Fig. 122.

Audi A3 2009 - CONTROL UNITS

Audi A3 2009 CONTROL UNITS LOCATION

Component	Location
ABS Control Module	At right rear of engine compartment. See Fig. 60.
Airbag Control Module	Under front of center console. See Fig. 62.
All-Wheel Drive Control Module (A)	Left front of rear axle differential. See Fig. 119.
Comfort System Central Control Module (C)	Right side of luggage compartment. See Fig. 68.
Coolant Fan Control (FC) Control Module (1)	Front of engine compartment. See Fig. 116.
Direct Shift Gearbox (DSG) Mechatronic	On transmission housing. See Fig. 120.
Door Control Module (Driver's)	Integrated in driver's door window regulator motor. See Fig. 65.
Door Control Module (Front Passenger's)	Integrated in right front door window regulator motor. See Fig. 66.
Door Control Module (Left/Right Rear)	Integrated in respective rear door window regulator motor. See Fig. 67.
Driver's Seat Heater Control Module	Under driver's seat. See Fig. 121.
Electronic Damping Control Module	Under front passenger's seat. See Fig. 126.
Fresh Air Blower Control Module (D)	Below right side of dash. See Fig. 118.
Fuel Pump (FP) Control Module	Under right side of rear seat. See Fig. 74.
Garage Door Opener Control Module (1)	Under front bumper. See Fig. 117.
Headlight Range Control Module	Behind right center of dash. See Fig. 113.
High Intensity Gas Discharge Light Control Module (Left/Right)	Behind respective headlight assembly. See Fig. 115.
Instrument Cluster Control Module	Behind instrument cluster. See Fig. 114.
Left Antenna Module	Left side of luggage compartment lid. See Fig. 96.
Motronic Engine Control Module (ECM)	In center of plenum chamber. See Fig. 61.
Multi-Function Steering Wheel Control Module	In steering wheel.
Navigation System W/CD Drive Control Module	Left side of luggage compartment.
NOX Sensor Control Module	Under vehicle, near NOX-catalyzer.
Parking Aid Control Module	Right side of luggage compartment.
Power Steering Control Module	Below steering rack. See Fig. 70.
Power Sunroof Control Module	Front center of roof. See Fig. 63.
Seat Heater Control Module (Driver/Front Passenger)	Under respective front seat. See Fig. 125.
Seat Occupied Recognition Control Module	On base of front passenger's seat. See Fig. 76.
Selector Lever Sensor System Control Module	Left side of selector lever base. See Fig. 75.
Steering Column Electronic Systems Control Module	Under steering column. See Fig. 72.
Throttle Valve Control Module (2.0L)	On throttle body. See Fig. 64.
Throttle Valve Control Module (3.2L) (11)	On throttle body. See Fig. 128.
Tire Pressure Monitoring Control Module	Behind glove compartment. See Fig. 127.
Towing Recognition Control Module	Right side of luggage compartment.
Vehicle Electrical System Control Module	Below left side of dash. See Fig. 71.
Wiper Motor Control Module	Integral to windshield wiper motor. See Fig. 69.

Audi A3 2009 - MOTORS

Audi A3 2009 MOTORS LOCATION

Component	Location
After-Run Coolant Pump	Left side of engine, below oil filter. See Fig. 108.
Air Flow Flap Motor (15)	Left side of fresh air blower unit. See Fig. 123.
Central Flap Actuator Motor (6)	Left side of HVAC unit. See Fig. 123.
Coolant Fans	Front of engine compartment, behind radiator.
Defroster Flap Motor (9)	Left side of HVAC unit. See Fig. 123.
Electro-Mechanical Power Steering Motor	Below steering rack. See Fig. 107.
Fresh Air Blower (19)	Under right side of dash. See Fig. 123.
Headlight Beam Adjustment Motor (Left/Right)	In respective headlight assembly.
Intake Flap Motor	Rear of left cylinder head. See Fig. 106.
Interior Temperature Sensor Fan	Integral to A/C control head.
Rear Window Wiper Motor	Center of cargo area lid. See Fig. 105.
Recirculation Flap Motor	Behind glove box. See Fig. 104.
Seat Backrest Adjustment Motor (Driver/Front Passenger) (3)	In respective seat back.
Seat Forward/Back Adjustment Motor (Driver/Front Passenger) (2)	Under respective front seat. See Fig. 134.
Seat Height Adjustment Motor (Driver/Front Passenger) (6)	Under respective front seat.
Seat Inclination Adjustment Motor (Driver/Front Passenger) (1)	Under front of respective front seat. See Fig. 134.
Seat Lumbar Support Height Adjustment Motor (Driver/Front Passenger) (4)	In respective seat back. See Fig. 134.
Seat Lumbar Support Height Adjustment Motor (Driver/Front Passenger) (5)	In respective seat back. See Fig. 134.
Sunroof Motor	Center front of roof. See Fig. 103.
Temperature Flap Actuator Motor (Left) (7)	Left side of HVAC unit. See Fig. 123.
Temperature Flap Actuator Motor (Right) (22)	Lower right side of HVAC unit. See Fig. 123.
Temperature Flap Potentiometer/Actuator (Left) (7)	Left side of HVAC unit. See Fig. 123.
Temperature Flap Potentiometer/Actuator (Right) (22)	Lower right side of HVAC unit. See Fig. 123.
Throttle Drive (Electronic Power Control (EPC)) (2.0L)	On throttle body. See Fig. 33.
Throttle Drive (Electronic Power Control (EPC)) (3.2L) (11)	On throttle body. See Fig. 128.
Windshield Wiper Motor	In left side of plenum chamber. See Fig. 102.

Audi A3 2009 - SENDING UNITS/SENSORS

Audi A3 2009 SENDING UNITS & SENSORS LOCATION

Component	Location
Accelerator Pedal Position Sender 2	At accelerator pedal. See Fig. 32.
Air Quality Sensor	In right plenum chamber. See Fig. 37.
Brake Pressure Sensor 1	Right rear of engine compartment. See Fig. 36.
Camshaft Position (CMP) Sensor (2.0L)	Front of cylinder head. See Fig. 48.
Camshaft Position (CMP) Sensor 2 (3.2L) (2)	Rear of cylinder head. See Fig. 132.
Camshaft Position (CMP) Sensor (3.2L) (1)	Rear of cylinder head. See Fig. 132.
Central Flap Motor Position Sensor (6)	On central flap actuator motor. See Fig. 123.
Charge Air Pressure Sensor	In charge air pipe. See Fig. 44.
Defroster Flap Motor Position Sensor (9)	On defroster flap motor. See Fig. 123.
Engine Coolant Temperature (ECT) Sensor (2.0L)	Right rear of engine. See Fig. 54.
Engine Coolant Temperature (ECT) Sensor (3.2L) (25)	Left side of cylinder head. See Fig. 128.
Engine Speed (RPM) Sensor (2.0L)	On engine block near transmission. See Fig. 41.
Engine Speed (RPM) Sensor (3.2L) (26)	Left side of engine. See Fig. 128.
Evaporator Vent Temperature Sensor	Right front of center console. See Fig. 39.
Footwell Vent Temperature Sensor (Left) (11)	Left side of HVAC unit. See Fig. 123.
Footwell Vent Temperature Sensor (Right) (12)	Top right side of HVAC unit. See Fig. 123.
Fresh Air Intake Duct Temperature Sensor (18)	Right side of fresh air blower unit. See Fig. 123.
Front Air Bag Crash Sensor (Driver's)	Left front of engine compartment. See Fig. 42.
Front Air Bag Crash Sensor (Front Passenger's)	Right front of engine compartment. See Fig. 43.
Front Level Control Module (Left)	Left front wheelwell, on suspension link.
Front Level Control Module (Right)	Left rear wheelwell, on suspension link.
Fuel Pressure Sensor	On left side of engine, in fuel rail. See Fig. 38.
Heated Oxygen Sensor (HO2S) (2.0L)	In exhaust, at turbocharger exit. See Fig. 46.
Heated Oxygen Sensor (HO2S) 2 (1)	In exhaust, upstream of catalytic converter. See Fig. 130.
Heated Oxygen Sensor (HO2S) (3.2L) (2)	In exhaust, upstream of catalytic converter. See Fig. 130.
High Pressure Sensor	In engine compartment, on a/c high pressure line.
Instrument Panel Interior Temperature Sensor	Integral to A/C control head.
Intake Air Temperature (IAT) Sensor	Left side of engine. See Fig. 50.
Intake Manifold Runner Position Sensor	On cylinder head, in intake manifold. See Fig. 45.
Knock Sensor (KS) 1 (2.0L)	On left front of engine block, near head. See Fig. 53.
Knock Sensor (KS) 1 (3.2L) (1)	Right front of engine. See Fig. 129.
Knock Sensor (KS) 2 (2.0L)	On left rear of engine block, near head. See Fig. 55.
Knock Sensor (KS) 2 (3.5L)	Left side of cylinder head. See Fig. 133.
Low Fuel Pressure Sensor	Left rear of engine. See Fig. 49.
Mass Air Flow (MAF) Sensor (2.0L)	On engine intake air duct. See Fig. 56.
Mass Air Flow (MAF) Sensor (3.2L) (13)	On engine air intake duct. See Fig. 128.
Outside Air Temperature Sensor	Behind left side of front bumper.
Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC)	Under vehicle, in exhaust. See Fig. 29.
Oxygen Sensor (O2S) Heater	In exhaust at turbocharger exit. See Fig. 109.
Oxygen Sensor (O2S) Heater 1 Behind Three Way Catalytic Converter (TWC)	Under vehicle, in exhaust. See Fig. 112.
Oxygen Sensor (O2S) (1)	Downstream of catalytic converter. See Fig. 131.
Oxygen Sensor (O2S) 2 (2)	Downstream of catalytic converter. See Fig. 131.
Rain/Light Recognition Sensor	On interior rearview mirror. See Fig. 47.
Recirculation Flap Motor Position Sensor	On recirculation flap motor.
Seat Occupied Recognition Pressure Sensor	On base of front passenger's seat. See Fig. 51.
Seat Occupied Recognition Safety Belt Force Sensor	In front passenger's seat belt latch. See Fig. 52.
Seat Temperature Sensor (Left/Right)	In respective front seat cushions.
Secondary Air Injection Sensor (11)	Near throttle valve control module. See Fig. 128.
Side Air Bag Crash Sensor (Driver's)	In driver's door. See Fig. 30.
Side Air Bag Crash Sensor (Front Passenger's)	In front passenger's door. See Fig. 31.
Side Air Bag Crash Sensor (Left Rear) (15)	In left "C" pillar. See Fig. 124.
Side Air Bag Crash Sensor (Right Rear) (12)	In right "C" pillar. See Fig. 124.
Steering Angle Sensor	Behind steering wheel. See Fig. 58.
Steering Torque Sensor	In power steering rack. See Fig. 40.
Sunlight Photo Sensor	Top left center of dash. See Fig. 28.
Throttle Drive Angle Sensor 1 (Electronic Power Control (EPC)) (2.0L)	Under engine top cover. See Fig. 34.
Throttle Drive Angle Sensor 1 (Electronic Power Control (EPC)) (3.2L) (11)	On throttle body. See Fig. 128.
Throttle Drive Angle Sensor 2 (Electronic Power Control (EPC)) (2.0L)	Under engine top cover. See Fig. 35.
Throttle Drive Angle Sensor 2 (Electronic Power Control (EPC)) (3.2L) (11)	On throttle body. See Fig. 128.
Throttle Position (TP) Sensor	On accelerator pedal. See Fig. 57.
Vent Temperature Sensor (Left/Right)	In respective dash air vent.

Audi A3 2009 - SOLENOIDS & SOLENOID VALVES

Audi A3 2009 SOLENOIDS & SOLENOID VALVES LOCATION

Component	Location
A/C Compressor Regulator Valve	Rear of A/C compressor.
Camshaft Adjustment Valve 1 Exhaust (4)	Rear of cylinder head. See Fig. 132.
Camshaft Adjustment Valve 1 (2.0L)	Top rear of right cylinder head. See Fig. 81.
Camshaft Adjustment Valve 1 (3.2L) (3)	Rear of cylinder head. See Fig. 132.
Cylinder 1 Fuel Injector	Right side of engine, below intake manifold. See Fig. 88.
Cylinder 2 Fuel Injector	Right side of engine, below intake manifold. See Fig. 89.
Cylinder 3 Fuel Injector	Right side of engine, below intake manifold. See Fig. 90.
Cylinder 4 Fuel Injector	Right side of engine, below intake manifold. See Fig. 91.
Evaporative Emissions (EVAP) Canister Purge Regulator Valve	Left rear of engine. See Fig. 95.
Fuel Pressure Regulator Valve	Rear of engine. See Fig. 85.
Ignition Switch Key Lock Solenoid	At ignition switch, on steering column. See Fig. 92.
Intake Manifold Tuning (IMT) Valve (3.2L)	Under intake manifold.
Shift Lock Solenoid	Front of selector lever base. See Fig. 77.
Turbocharger Recirculating Valve	Top front of engine. See Fig. 82.
Wastegate Bypass Regulator Valve	Right rear of engine compartment. See Fig. 94.

Audi A3 2009 - SWITCHES

Audi A3 2009 SWITCHES LOCATION

Component	Location
Brake Fluid Level Warning Switch	In brake fluid reservoir cap. See Fig. 3.
Brake Light Switch	Top of brake pedal assembly. See Fig. 22.
Driver's Safety Belt Switch	In driver's seat belt latch. See Fig. 20.
Engine Coolant Level (ECL) Warning Switch	On coolant reservoir. See Fig. 26.
Front Hood Switch	Base of engine compartment hood latch. See Fig. 24.
Front Passenger's Safety Belt Switch	In front passenger's seat belt latch. See Fig. 21.
Parking Brake Warning Light Switch	At base of parking brake lever assembly. See Fig. 27.
Selector Lever Park Position Lock Switch	Forward of gear selector assembly. See Fig. 25.

Audi A3 2009 - MISCELLANEOUS

Audi A3 2009 MISCELLANEOUS LOCATION

Component	Location
Air Bag Spiral Spring/Return Spring W/Slip Ring	Behind steering wheel. See Fig. 23.
Alarm Horn	In right front wheelwell. See Fig. 59.
Amplifier (W/Bose)	Right side of luggage compartment. See Fig. 97.
Antenna Amplifier	Top left side of cargo area lid. See Fig. 99.
Battery Interrupt Igniter (5)	On main fuse panel "D". See Fig. 5.
Data Bus On Board Diagnostic Interface	Behind center console storage compartment. See Fig. 73.
Driver's Air Bag Unit (2)	In steering wheel. See Fig. 124.
Front Passenger's Air Bag Unit (6)	Behind right side of dash. See Fig. 124.
Head Curtain Airbag Igniter (Driver's)	Left rear side of roof. See Fig. 83.
Head Curtain Airbag Igniter (Front Passenger's)	Right rear side of roof. See Fig. 84.
Ignition Coil 1 With Power Output Stage	Top of cylinder head, above cylinder no. 1. See Fig. 93.
Ignition Coil 2 With Power Output Stage	Top of cylinder head, above cylinder no. 2. See Fig. 78.
Ignition Coil 3 With Power Output Stage	Top of cylinder head, above cylinder no. 3. See Fig. 86.
Ignition Coil 4 With Power Output Stage	Top of cylinder head, above cylinder no. 4. See Fig. 87.
Inside Microphone (W/Bose)	Center front of roof. See Fig. 101.
Navigation/TV Tuner	Left side of luggage compartment.
Positive Crankcase Ventilation (PCV) Heating Element (10)	Center rear of engine compartment. See Fig. 128.
Rear Window Antenna 1	Integral with rear window defogger. See Fig. 98.
Safety Belt Tensioner Igniter 1 (Driver's)	Base of left "B" pillar. See Fig. 79.
Safety Belt Tensioner Igniter 1 (Front Passenger's)	Base of right "B" pillar. See Fig. 80.
Satellite Radio	Left side of luggage compartment.
Side Air Bag (Driver's) (16)	Left side of driver's seat back. See Fig. 124.
Side Air Bag (Front Passenger's) (10)	Right side of front passenger's seat back. See Fig. 124.
Side Air Bag (Left Rear Passenger's) (14)	Left side of left rear passenger's seat back. See Fig. 124.
Side Air Bag (Right Rear Passenger's) (11)	Right side of right rear passenger's seat back. See Fig. 124.
Side Curtain Air Bag (Left) (13)	In left roof rail. See Fig. 124.
Side Curtain Air Bag (Right) (9)	In right roof rail. See Fig. 124.
Telephone Amplifier	Left side of luggage compartment.
Telephone/Navigation System (GPS)/Auxiliary Heater Antenna	Center rear of roof. See Fig. 100.
Washer Nozzle Heater (Left)	In left side of plenum chamber. See Fig. 110.
Washer Nozzle Heater (Right)	In right side of plenum chamber. See Fig. 111.
Windshield Antenna Suppression Filter	In rear lid. See Fig. 19.

Audi A3 2009 - GROUNDS

Audi A3 2009 GROUNDS LOCATION

Component	Location
G12	Left side of engine compartment. See Fig. 6.
G43 (A)	Behind right kick panel. See Fig. 11.
G44 (A)	Behind left kick panel. See Fig. 12.
G51	At right side of luggage compartment. See Fig. 13.
G53	Right side of rear lid. See Fig. 14.
G61	On left "C" pillar. See Fig. 15.
G62	On right "C" pillar. See Fig. 16.
G607	In left plenum chamber. See Fig. 7.
G610	Under front of center console. See Fig. 17.
G638 (B)	Behind right kick panel. See Fig. 11.
G639 (B)	Behind left kick panel. See Fig. 12.
G655 (C)	On left headlight. See Fig. 10.
G656	On right headlight. See Fig. 8.
G662	On left "C" pillar. See Fig. 18.
G671 (A)	On left front long member. See Fig. 10.
G673	On left front long member. See Fig. 9.
G674 (B)	On left front long member. See Fig. 10.