2008 AUDI A4

Audi A4 2008 - BUZZERS, RELAYS & TIMERS

Audi A4 2008 BUZZERS, RELAYS & TIMERS LOCATION

Component	Location
Brake Booster Relay	Left side of dash. See Fig. 17.
Convertible Top Hydraulic Pump Relay	Right side of luggage compartment. See Fig. 180.
Convertible Top Hydraulic Pump Relay 2	Right side of luggage compartment. See Fig. 181.
Coolant Circulation Pump Relay	Left rear of engine compartment. See Fig. 33.
Front Parking Warning Buzzer	Behind center of dash. See Fig. 50.
Fuel Pump (FP) 2 Relay	Left side of dash. See Fig. 51.
Horn Relay	On relay & fuse panel at left side of dash. See Fig. 69.
Load Reduction Relay	Left side of dash. See Fig. 84.
Locking Relay For Starter (Clutch Pedal Switch)	Left rear of engine compartment. See Fig. 89.
Motronic Engine Control Module (ECM) Power Supply Relay	Left rear of engine compartment. See Fig. 93.
Park/Neutral Position (PNP) Relay	Left rear of engine compartment. See Fig. 97.
Secondary Air Injection (AIR) Pump Relay	Left rear of engine compartment. See Fig. 106.
Starter Interlock Alarm System Relay (A/T)	Left rear of engine compartment. See Fig. 115.
Warning Buzzer (Parking) (Avant)	Left side of cargo area. See Fig. 128.
Warning Buzzer (Parking) (Sedan)	Under package shelf. See Fig. 129.

Audi A4 2008 - CIRCUIT PROTECTION DEVICES

Audi A4 2008 CIRCUIT PROTECTION DEVICES LOCATION

Component	Location
Fuse Strip	Rear of engine compartment, in plenum. See Fig. 144.
Rear Shade Circuit Breaker	Left side of dash. See Fig. 99.

Audi A4 2008 - CONTROL UNITS

Audi A4 2008 CONTROL UNITS LOCATION

Component	Location
ABS Control Module (W/EDL)	At left side of engine compartment. See Fig. 9.
Air Bag Control Module	Below center console. See Fig. 11.
Antenna Module (Left)	Under left side of luggage compartment lid. See Fig. 191.
Antenna Module (Right)	Under right side of luggage compartment lid. See Fig. 203.
Central Control Module (Comfort System)	Below driver's seat. See Fig. 26.
Convertible Top Control Module	Behind right quarterpanel. See Fig. 176.
Coolant FC (Fan Control) Control Module	Front of engine compartment. See Fig. 34.
Door Control Module (Driver Side)	Integrated in driver's door window regulator motor. See Fig. 43.
Door Control Module (Left Rear)	Integrated in left rear door window regulator motor. See Fig. 45.
Door Control Module (Passenger Side )	Integrated in right front door window regulator motor. See Fig. 44.
Door Control Module (Right Rear)	Integrated in right rear door window regulator motor. See Fig. 46.
Entry Assistance Control Module (Left)	Under driver's seat. See Fig. 192.
Entry Assistance Control Module (Right)	Under front passenger's seat. See Fig. 204.
Fresh Air Blower Control Module	Below right side of dash. See Fig. 27.
Garage Door Opener Control Module	Behind right side of front bumper. See Fig. 145.
Headlight Range Control Module	Behind right side of dash. See Fig. 66.
Heated Seat Control Module (Left Rear)	Rear of center console. See Fig. 81.
Heated Seat Control Module (Right Rear)	Rear of center console. See Fig. 103.
Heated Windshield Control Module	Rear center of engine compartment. See Fig. 67.
High-Intensity Gas Discharge Lamp Control Module (Left)	At left headlight assembly. See Fig. 156.
High-Intensity Gas Discharge Lamp Control Module (Right)	At right headlight assembly. See Fig. 161.
Instrument Cluster Control Module	Behind instrument cluster. See Fig. 32.
Memory Seat Control Module	Under driver's seat. See Fig. 91.
Motronic Engine Control Module (ECM)	Left rear of engine compartment, in plenum chamber. See Fig. 92.
Navigation Control Module W/CD (Avant)	Left rear of cargo area. See Fig. 28.
Navigation Control Module W/CD (Convertible)	Left side of luggage compartment. See Fig. 171.
Navigation Control Module W/CD (Sedan)	Left side of trunk. See Fig. 29.
Parking Aid Control Module (Avant)	Left side of cargo area. See Fig. 30.
Parking Aid Control Module (Sedan)	Left side of trunk. See Fig. 31.
Power Sunroof Control Module	Under roof console. See Fig. 159.
Radar Interior Monitoring Control Module 1	Under center console. See Fig. 201.
Radar Interior Monitoring Control Module 2	Under center of rear seat. See Fig. 202.
Rear Window Shade Control Module	Under package shelf. See Fig. 100.
Servotronic Control Module	At left side of dash. See Fig. 114.
Steering Column Electronic Systems Control Module	On steering column, behind steering wheel. See Fig. 117.
Telephone/Telematic Control Module	Under passenger's seat. See Fig. 119.
Throttle Valve Control Module (2.0L)	On intake manifold.
Throttle Valve Control Module (3.2L)	Behind intake manifold, on throttle valve housing. See Fig. 121.
Transmission Control Module (TCM) (CVT)	At rear of transmission. See Fig. 123.
Transmission Control Module (TCM) (5 Speed A/T)	Left rear of engine compartment. See Fig. 122.
Vehicle Electrical System Control Module	At left side of dash. See Fig. 127.

Audi A4 2008 - MOTORS

Audi A4 2008 MOTORS LOCATION

Component	Location
ABS Hydraulic Unit	Left side of engine compartment. See Fig. 10.
Brake System Vacuum Pump (A/T)	Left side of engine compartment. See Fig. 20.
Convertible Top Compartment Cover Locking Motor	Center rear of convertible top compartment. See Fig. 173.
Convertible Top Hydraulic Pump	Right side of luggage compartment. See Fig. 179.
Convertible Top Locking Motor	Center front of convertible top. See Fig. 185.
Driver's Seat Seatback Adjustment Motor	In driver's seat back. See Fig. 195.
Front Passenger's Backrest Adjusting Motor	In front passenger's seat back. See Fig. 190.
Headlight Beam Adjusting Motor (Left)	In left headlight assembly. See Fig. 193.
Headlight Beam Adjusting Motor (Right)	In right headlight assembly. See Fig. 205.
Intake Flap Motor	In intake manifold. See Fig. 152.
Leak Detection Pump (LDP)	In left rear wheel well. See Fig. 78.
Lock Unit For Central Locking (Driver's)	Rear of driver's door. See Fig. 85.
Lock Unit For Central Locking (Left Rear)	Rear of left rear door. See Fig. 87.
Lock Unit For Central Locking (Passenger's)	Rear of passenger's door. See Fig. 86.
Lock Unit For Central Locking (Right Rear)	Rear of right rear door. See Fig. 88.
Power Sunroof Motor	Under roof console. See Fig. 160.
Seat Lumbar Support Curvature Adjustment Motor (Driver's)	In driver's seat back. See Fig. 137.
Seat Lumbar Support Curvature Adjustment Motor (Front Passenger's)	In front passenger's seat back. See Fig. 142.
Seat Lumbar Support Height Adjustment Motor (Driver's)	In driver's seat back. See Fig. 138.
Seat Lumbar Support Height Adjustment Motor (Front Passenger's)	In front passenger's seat back. See Fig. 141.
Secondary Air Injection (AIR) Pump Motor (3.2L)	Right front of engine compartment. See Fig. 105.
Throttle Drive	Integral to throttle valve control module. See Fig. 163.
Window Regulator Motor (Left Rear)	Behind left quarterpanel. See Fig. 196.
Window Regulator Motor (Right Rear)	Behind right quarterpanel. See Fig. 197.

Audi A4 2008 - SENDING UNITS/SENSORS

Audi A4 2008 SENDING UNITS & SENSORS LOCATION

Component	Location
Accelerator Pedal Position Sender 2	At accelerator pedal. See Fig. 108.
Brake Booster Pressure Sensor	On right side of brake booster. See Fig. 130.
Brake Pressure Sensor 1	Left side of engine compartment. See Fig. 19.
Camshaft Position (CMP) Sensor 2 (3.2L)	Left rear of engine. See Fig. 24.
Camshaft Position (CMP) Sensor (3.2L)	Rear of right cylinder bank. See Fig. 23.
Camshaft Position (CMP) Sensor 3 (3.2L)	Right rear of engine. See Fig. 132.
Camshaft Position (CMP) Sensor 4 (3.2L)	Rear of left cylinder head. See Fig. 25.
Convertible Top Frame Position Sensor	At right convertible top main mount. See Fig. 177.
Engine Coolant Temperature (ECT) Sensor (2.0L)	Lower rear of engine. See Fig. 139.
Engine Coolant Temperature (ECT) Sensor (3.2L)	Right rear of engine. See Fig. 48.
Front Air Bag Crash Sensor (Driver's Side)	Left front of engine compartment. See Fig. 47.
Front Air Bag Crash Sensor (Passenger's Side)	Right front of engine compartment. See Fig. 98.
Heated Oxygen Sensor (HO2S) (2.0L)	In exhaust, at turbocharger exit. See Fig. 146.
Heated Oxygen Sensor (HO2S) (3.2L)	Right rear of engine compartment, in exhaust. See Fig. 147.
High Pressure Sensor	Left side of A/C condenser. See Fig. 68.
Intake Manifold Runner Position Sensor	Top left side of engine, in intake manifold. See Fig. 153.
Knock Sensor (KS) 1 (2.0L)	Front of cylinder head. See Fig. 154.
Knock Sensor (KS) 2 (2.0L)	Rear of cylinder head. See Fig. 155.
Light Recognition Sensor	Top of windshield, in rearview mirror assembly. See Fig. 83.
Mass Air Flow (MAF) Sensor (3.2L)	On air intake duct. See Fig. 90.
Outside Air Temperature Sensor	Behind front bumper. See Fig. 95.
Oxygen Sensor (O2S) Heater (2.0L)	In exhaust, at turbocharger exit. See Fig. 158.
Parking Aid Sensor (Left Front)	In front bumper. See Fig. 80.
Parking Aid Sensor (Left Front Center)	In front bumper. See Fig. 79.
Parking Aid Sensor (Left Rear)	On rear bumper. See Fig. 110.
Parking Aid Sensor (Left Rear Center)	On rear bumper. See Fig. 111.
Parking Aid Sensor (Right Front)	Front bumper. See Fig. 102.
Parking Aid Sensor (Right Front Center)	On front bumper. See Fig. 101.
Parking Aid Sensor (Right Rear)	On rear bumper. See Fig. 112.
Parking Aid Sensor (Right Rear Center)	On rear bumper. See Fig. 113.
Rotation Rate Sender	Under front of center console. See Fig. 109.
Sensor (O2S) Heater (3.2L)	Right rear of engine. See Fig. 96.
Side Air Bag Crash Sensor (Driver's Side) (Convertible)	At left "B" pillar. See Fig. 188.
Side Air Bag Crash Sensor (Driver's Side) (Except Convertible)	At left "B" pillar. See Fig. 35.
Side Air Bag Crash Sensor (Left Rear)	At bottom of left "C" pillar. See Fig. 82.
Side Air Bag Crash Sensor (Passenger's Side) (Convertible)	At right "B" pillar. See Fig. 189.
Side Air Bag Crash Sensor (Passenger's Side) (Except Convertible)	At right "B" pillar. See Fig. 36.
Side Air Bag Crash Sensor (Right Rear)	At bottom of right "C" pillar. See Fig. 104.
Steering Angle Sensor	Behind steering wheel. See Fig. 116.
Sunlight Photo Sensor	Under center of dash. See Fig. 207.
Throttle Drive Angle Sensor 1	Integral to throttle valve control module.
Throttle Drive Angle Sensor 2	Integral to throttle valve control module.
Throttle Position Sensor (3.2L)	On accelerator pedal. See Fig. 120.
Ultra-Sound Sensor For Anti-Theft	In roof console. See Fig. 124.

Audi A4 2008 - SOLENOIDS & SOLENOID VALVES

Audi A4 2008 SOLENOIDS & SOLENOID VALVES LOCATION

Component	Location
ABS Hydraulic Unit	Left side of engine compartment. See Fig. 10.
Camshaft Adjustment Valve 1 (Exhaust) (3.2L)	Right front of engine. See Fig. 21.
Camshaft Adjustment Valve 1 (2.0L)	Rear of engine. See Fig. 131.
Camshaft Adjustment Valve 2 (Exhaust) (3.2L)	Left front of engine. See Fig. 22.
Evaporative Emissions (EVAP) Canister Purge Regulator Valve (2.0L)	Left side of engine compartment. See Fig. 140.
Evaporative Emissions (EVAP) Canister Purge Regulator Valve (3.2L)	Right side of engine compartment. See Fig. 49.
Fuel Injector No. 1 (2.0L)	Left side of Engine. See Fig. 133.
Fuel Injector No. 1 (3.2L)	Right side of engine. See Fig. 37.
Fuel Injector No. 2 (2.0L)	Left side of engine. See Fig. 134.
Fuel Injector No. 2 (3.2L)	Right side of engine. See Fig. 38.
Fuel Injector No. 3 (2.0L)	Left side of engine. See Fig. 135.
Fuel Injector No. 3 (3.2L)	Right side of engine. See Fig. 39.
Fuel Injector No. 4 (2.0L)	Left side of engine. See Fig. 136.
Fuel Injector No. 4 (3.2L)	Left side of engine. See Fig. 40.
Fuel Injector No. 5 (3.2L)	Left side of engine. See Fig. 41.
Fuel Injector No. 6 (3.2L)	Left side of engine. See Fig. 42.
Fuel Pressure Regulator Valve	Top left rear of engine. See Fig. 143.
Intake Manifold Change-Over Valve (3.2L)	Front of engine. See Fig. 77.
Power Convertible Top Valve 1	Right side of luggage compartment. See Fig. 198.
Power Convertible Top Valve 2	Right side of luggage compartment. See Fig. 199.
Power Convertible Top Valve 3	Right side of luggage compartment. See Fig. 200.
Rollover Solenoid (Left)	Behind left rear seat back. See Fig. 194.
Rollover Solenoid (Right)	Behind right rear seat back. See Fig. 206.
Secondary Air Injection (AIR) Solenoid Valve (3.2L)	Rear of engine. See Fig. 107.
Turbocharger Recalculating Valve	Right front of engine. See Fig. 164.
Valve 1 For Camshaft Adjustment (3.2L)	Right front of engine. See Fig. 125.
Valve 2 For Camshaft Adjustment (3.2L)	Left front of engine. See Fig. 126.
Wastegate Bypass Regulator Valve (2.0L)	Right front of engine. See Fig. 165.

Audi A4 2008 - SWITCHES

Audi A4 2008 SWITCHES LOCATION

Component	Location
Ambient Temperature Switch	Front of vehicle. See Fig. 12.
Brake Fluid Level Warning Switch	On brake fluid reservoir. See Fig. 18.
Compartment Cover Locked Right Switch 1	Right side of convertible top compartment. See Fig. 168.
Compartment Cover Open Position Switch	Right side of convertible top compartment. See Fig. 169.
Compartment Left Locked Switch	Left side of convertible top compartment. See Fig. 170.
Convertible Top Closed Position Switch	Right side of convertible top compartment. See Fig. 172.
Convertible Top Compartment Enclosure Position Switch	Right side of luggage compartment. See Fig. 174.
Convertible Top Compartment Latch Switch (Unlock)	Center rear of convertible top compartment. See Fig. 175.
Convertible Top Front Lock Switch	Top center of windshield header. See Fig. 178.
Convertible Top Left Lock Switch	Left side of windshield header. See Fig. 182.
Convertible Top Lock Switch (Closed)	Center front of convertible top. See Fig. 183.
Convertible Top Lock Switch (Open)	Center front of convertible top. See Fig. 184.
Convertible Top Open Position Switch (Stored)	Right side of convertible top compartment. See Fig. 186.
Convertible Top Right Lock Switch	Right side of windshield header. See Fig. 187.
Multi-Function Transmission Range (TR) Switch	Left side of transmission. See Fig. 94.

Audi A4 2008 - MISCELLANEOUS

Audi A4 2008 MISCELLANEOUS LOCATION

Component	Location
Alarm Horn	Right side of convertible top compartment. See Fig. 166.
Amplifier (Avant)	Right side of cargo area. See Fig. 13.
Amplifier (Sedan)	Right side of trunk. See Fig. 14.
Antenna (Central Locking & Anti-Theft Alarm System)	Under left side of luggage compartment lid. See Fig. 167.
Antenna Splitter	Below front passenger's seat. See Fig. 16.
Antenna (Telephone)	Right front of vehicle. See Fig. 15.
Antenna 2 (Telephone)	Under right rear of vehicle. See Fig. 118.
Diagnostic Connector (DLC)	Under left side of dash. See Fig. 1.
Ignition Coil 1 W/Power Output Stage (2.0L)	Top of engine. See Fig. 148.
Ignition Coil 1 W/Power Output Stage (3.2L)	Right side of engine. See Fig. 70.
Ignition Coil 2 W/Power Output Stage (2.0L)	Top of engine. See Fig. 149.
Ignition Coil 2 W/Power Output Stage (3.2L)	Right side of engine. See Fig. 71.
Ignition Coil 3 W/Power Output Stage (2.0L)	Top of engine. See Fig. 150.
Ignition Coil 3 W/Power Output Stage (3.2L)	Right side of engine. See Fig. 72.
Ignition Coil 4 W/Power Output Stage (2.0L)	Top of engine. See Fig. 151.
Ignition Coil 4 W/Power Output Stage (3.2L)	Left side of engine. See Fig. 73.
Ignition Coil 5 W/Power Output Stage (3.2L)	Left side of engine. See Fig. 74.
Ignition Coil 6 W/Power Output Stage (3.2L)	Left side of engine. See Fig. 75.
Induction Coil (Anti-Theft Immobilizer)	Right side of steering column. See Fig. 76.
Washer Nozzle Heater (Left)	Under left rear of engine compartment lid. See Fig. 157.
Washer Nozzle Heater (Right)	Under right rear of engine compartment lid. See Fig. 162.

Audi A4 2008 - CONNECTORS

Audi A4 2008 CONNECTORS LOCATION

Component	Location
T3b (3.2L) (3 Pin)	Rear of engine compartment. See Fig. 3.
T3e (3.2L) (3 Pin)	Rear of engine compartment. See Fig. 4.
T3 (3.2L) (3 Pin)	Rear of engine compartment. See Fig. 2.
T4a (3.2L) (4 Pin)	Rear of engine compartment. See Fig. 6.
T4c (3.2L) (4 Pin)	Rear of engine compartment. See Fig. 5.
T6a (3.2L) (6 Pin)	Rear of engine compartment. See Fig. 8.
T6 (3.2L) (6 Pin)	Rear of engine compartment. See Fig. 7.

Audi A4 2008 - GROUNDS

Audi A4 2008 GROUNDS LOCATION

Component	Location
G3	Right side of engine compartment. See Fig. 65.
G11	Right rear of engine compartment. See Fig. 62.
G12	Left rear of engine compartment. See Fig. 63.
G18	Left rear of engine. See Fig. 64.
G26	Left side of engine compartment. See Fig. 61.
G32	Left kick panel. See Fig. 60.
G43	Above right kick panel. See Fig. 58.
G44	Above left kick panel. See Fig. 57.
G50	Left side of luggage compartment. See Fig. 52.
G73	Rear of roof. See Fig. 55.
G77	Left "B" pillar. See Fig. 54.
G78	Right "B" pillar. See Fig. 53.
G347	Front of center console. See Fig. 59.
G610	Under front of center console. See Fig. 56.