2005 AUDI A4

Audi A4 2005 - BUZZERS, RELAYS & TIMERS

Audi A4 2005 BUZZERS, RELAYS & TIMERS LOCATION

Component	Location
Brake Booster Relay	Left side of dash. See Fig. 22 .
Coolant Circulation Pump Relay	Left rear of engine compartment. See Fig. 40 .
Front Parking Warning Buzzer	Behind center of dash. See Fig. 63 .
Fuel Pump (FP) 2 Relay	Left side of dash. See Fig. 64 .
Horn Relay	On relay & fuse panel at left side of dash. See Fig. 84 .
Load Reduction Relay	Left side of dash. See Fig. 106 .
Locking Relay For Starter (Clutch Pedal Switch)	Left rear of engine compartment. See Fig. 111 .
Motronic Engine Control Module (ECM) Power Supply Relay	Left rear of engine compartment. See Fig. 116 .
Park/Neutral Position (PNP) Relay	Left rear of engine compartment. See Fig. 123 .
Secondary Air Injection (AIR) Pump Relay	Left rear of engine compartment. See Fig. 133 .
Starter Interlock Alarm System Relay (A/T)	Left rear of engine compartment. See Fig. 143 .
Warning Buzzer (Parking) (Avant)	Left side of cargo area. See Fig. 157 .
Warning Buzzer (Parking) (Sedan)	Under package shelf. See Fig. 158 .

Audi A4 2005 - CIRCUIT PROTECTION DEVICES

Audi A4 2005 CIRCUIT PROTECTION DEVICES LOCATION

Component	Location
Rear Shade Circuit Breaker	Left side of dash. See Fig. 125 .

Audi A4 2005 - CONTROL UNITS

Audi A4 2005 CONTROL UNITS LOCATION

Component	Location
ABS Control Module (W/EDL)	At left side of engine compartment. See Fig. 14 .
Air Bag Control Module	Below center console. See Fig. 16 .
Central Control Module (Comfort System)	Below driver's seat. See Fig. 33 .
Coolant FC (Fan Control) Control Module	Front of engine compartment. See Fig. 41 .
Door Control Module (Driver Side)	Integrated in driver's door window regulator motor. See Fig. 54 .
Door Control Module (Left Rear)	Integrated in left rear door window regulator motor. See Fig. 56 .
Door Control Module (Passenger Side )	Integrated in right front door window regulator motor. See Fig. 55 .
Door Control Module (Right Rear)	Integrated in right rear door window regulator motor. See Fig. 57 .
Fresh Air Blower Control Module	Below right side of dash. See Fig. 34 .
Headlight Range Control Module	Behind right side of dash. See Fig. 80 .
Heated Seat Control Module (Left Rear)	Rear of center console. See Fig. 103 .
Heated Seat Control Module (Right Rear)	Rear of center console. See Fig. 130 .
Heated Windshield Control Module	Rear center of engine compartment. See Fig. 82 .
Instrument Cluster Control Module	Behind instrument cluster. See Fig. 39 .
Memory Seat Control Module	Under driver's seat. See Fig. 114 .
Motronic Engine Control Module (ECM)	Left rear of engine compartment, in plenum chamber. See Fig. 115 .
Navigation Control Module W/CD (Avant)	Left rear of cargo area. See Fig. 35 .
Navigation Control Module W/CD (Sedan)	Left side of trunk. See Fig. 36 .
Parking Aid Control Module (Avant)	Left side of cargo area. See Fig. 37 .
Parking Aid Control Module (Sedan)	Left side of trunk. See Fig. 38 .
Rear Window Shade Control Module	Under package shelf. See Fig. 126 .
Servotronic Control Module	At left side of dash. See Fig. 142 .
Steering Column Electronic Systems Control Module	On steering column, behind steering wheel. See Fig. 145 .
Telephone/Telematic Control Module	Under passenger's seat. See Fig. 147 .
Throttle Valve Control Module (1.8L Turbo)	On throttle body. See Fig. 149 .
Throttle Valve Control Module (3.0L)	Behind intake manifold, on throttle valve housing. See Fig. 150 .
Transmission Control Module (TCM) (CVT)	At rear of transmission. See Fig. 152 .
Transmission Control Module (TCM) (5 Speed A/T)	Left rear of engine compartment. See Fig. 151 .
Vehicle Electrical System Control Module	At left side of dash. See Fig. 156 .

Audi A4 2005 - MOTORS

Audi A4 2005 MOTORS LOCATION

Component	Location
ABS Hydraulic Unit	Left side of engine compartment. See Fig. 15 .
Brake System Vacuum Pump (A/T)	Left side of engine compartment. See Fig. 25 .
Leak Detection Pump (LDP)	In left rear wheel well. See Fig. 100 .
Lock Unit For Central Locking (Driver's)	Rear of driver's door. See Fig. 107 .
Lock Unit For Central Locking (Left Rear)	Rear of left rear door. See Fig. 109 .
Lock Unit For Central Locking (Passenger's)	Rear of passenger's door. See Fig. 108 .
Lock Unit For Central Locking (Right Rear)	Rear of right rear door. See Fig. 110 .
Secondary Air Injection (AIR) Pump Motor (3.0L)	Right front of engine compartment. See Fig. 132 .

Audi A4 2005 - SENDING UNITS/SENSORS

Audi A4 2005 SENDING UNITS & SENSORS LOCATION

Component	Location
Accelerator Pedal Position Sender 2	At accelerator pedal. See Fig. 136 .
Brake Pressure Sensor 1	Left side of engine compartment. See Fig. 24 .
Camshaft Position (CMP) Sensor (1.8L Turbo)	Front of engine. See Fig. 29 .
Camshaft Position (CMP) Sensor 2 (3.0L)	Left rear of engine. See Fig. 31 .
Camshaft Position (CMP) Sensor (3.0L)	Rear of right cylinder bank. See Fig. 30 .
Camshaft Position (CMP) Sensor 4 (3.0L)	Rear of left cylinder head. See Fig. 32 .
Engine Coolant Temperature (ECT) Sensor (1.8L Turbo)	Rear of engine. See Fig. 59 .
Engine Coolant Temperature (ECT) Sensor (3.0L)	Right rear of engine. See Fig. 60 .
Front Air Bag Crash Sensor (Driver's Side)	Left front of engine compartment. See Fig. 58 .
Front Air Bag Crash Sensor (Passenger's Side)	Right front of engine compartment. See Fig. 124 .
Heated Oxygen Sensor (HO2S) (1.8L Turbo)	Right side of engine compartment. See Fig. 81 .
High Pressure Sensor	Left side of A/C condenser. See Fig. 83 .
Intake Air Temperature (IAT) Sensor (1.8L Turbo)	Left side of engine. See Fig. 96 .
Knock Sensor (KS) 1 (1.8L Turbo)	On top of engine. See Fig. 98 .
Knock Sensor (KS) 2 (1.8L Turbo)	On top of engine. See Fig. 99 .
Light Recognition Sensor	Top of windshield, in rearview mirror assembly. See Fig. 105 .
Mass Air Flow (MAF) Sensor (1.8L Turbo)	On intake air duct. See Fig. 112 .
Mass Air Flow (MAF) Sensor (3.0L)	On air intake duct. See Fig. 113 .
Outside Air Temperature Sensor	Behind front bumper. See Fig. 118 .
Oxygen Sensor (O2S) Behind TWC (1.8L Turbo)	Right rear of engine compartment. See Fig. 119 .
Oxygen Sensor (O2S) Heater 1 Behind TWC (1.8L Turbo)	Right rear of engine. See Fig. 122 .
Oxygen Sensor (O2S) Heater (1.8L Turbo)	Right side of engine compartment. See Fig. 120 .
Parking Aid Sensor (Left Front)	In front bumper. See Fig. 102 .
Parking Aid Sensor (Left Front Center)	In front bumper. See Fig. 101 .
Parking Aid Sensor (Left Rear)	On rear bumper. See Fig. 138 .
Parking Aid Sensor (Left Rear Center)	On rear bumper. See Fig. 139 .
Parking Aid Sensor (Right Front)	Front bumper. See Fig. 129 .
Parking Aid Sensor (Right Front Center)	On front bumper. See Fig. 128 .
Parking Aid Sensor (Right Rear)	On rear bumper. See Fig. 140 .
Parking Aid Sensor (Right Rear Center)	On rear bumper. See Fig. 141 .
Rotation Rate Sender	Under front of center console. See Fig. 137 .
Sensor (O2S) Heater (3.0L)	Right rear of engine. See Fig. 121 .
Side Air Bag Crash Sensor (Driver's Side)	At left "B" pillar. See Fig. 42 .
Side Air Bag Crash Sensor (Left Rear)	At bottom of left "C" pillar. See Fig. 104 .
Side Air Bag Crash Sensor (Passenger's Side)	At right "B" pillar. See Fig. 43 .
Side Air Bag Crash Sensor (Right Rear)	At bottom of right "C" pillar. See Fig. 131 .
Steering Angle Sensor	Behind steering wheel. See Fig. 144 .
Throttle Position Sensor (3.0L)	On accelerator pedal. See Fig. 148 .
Ultra-Sound Sensor For Anti-Theft	In roof console. See Fig. 153 .

Audi A4 2005 - SOLENOIDS & SOLENOID VALVES

Audi A4 2005 SOLENOIDS & SOLENOID VALVES LOCATION

Component	Location
ABS Hydraulic Unit	Left side of engine compartment. See Fig. 15 .
Camshaft Adjustment Valve 1 (Exhaust) (3.0L)	Right front of engine. See Fig. 27 .
Camshaft Adjustment Valve 1 (1.8L Turbo)	Rear of engine. See Fig. 26 .
Camshaft Adjustment Valve 2 (Exhaust) (3.0L)	Left front of engine. See Fig. 28 .
Evaporative Emissions (EVAP) Canister Purge Regulator Valve (1.8L Turbo)	Right side of engine compartment. See Fig. 61 .
Evaporative Emissions (EVAP) Canister Purge Regulator Valve (3.0L)	Right side of engine compartment. See Fig. 62 .
Fuel Injector No. 1 (1.8L Turbo)	Top Of Engine. See Fig. 44 .
Fuel Injector No. 1 (3.0L)	Right side of engine. See Fig. 48 .
Fuel Injector No. 2 (1.8L Turbo)	On top of engine. See Fig. 45 .
Fuel Injector No. 2 (3.0L)	Right side of engine. See Fig. 49 .
Fuel Injector No. 3 (1.8L Turbo)	Top of engine. See Fig. 46 .
Fuel Injector No. 3 (3.0L)	Right side of engine. See Fig. 50 .
Fuel Injector No. 4 (1.8L Turbo)	Top of engine. See Fig. 47 .
Fuel Injector No. 4 (3.0L)	Left side of engine. See Fig. 51 .
Fuel Injector No. 5 (3.0L)	Left side of engine. See Fig. 52 .
Fuel Injector No. 6 (3.0L)	Left side of engine. See Fig. 53 .
Intake Manifold Change-Over Valve (3.0L)	Front of engine. See Fig. 97 .
Recirculating Valve For Turbocharger (1.8L Turbo)	Left side of engine. See Fig. 127 .
Secondary Air Injection (AIR) Solenoid Valve (1.8 Turbo)	Left side of engine compartment. See Fig. 134 .
Secondary Air Injection (AIR) Solenoid Valve (3.0L)	Rear of engine. See Fig. 135 .
Valve 1 For Camshaft Adjustment (3.0L)	Right front of engine. See Fig. 154 .
Valve 2 For Camshaft Adjustment (3.0L)	Left front of engine. See Fig. 155 .
Wastegate Bypass Regulator Valve (1.8L Turbo)	Right front of engine compartment. See Fig. 159 .

Audi A4 2005 - SWITCHES

Audi A4 2005 SWITCHES LOCATION

Component	Location
Ambient Temperature Switch	Front of vehicle. See Fig. 17 .
Brake Fluid Level Warning Switch	On brake fluid reservoir. See Fig. 23 .
Multi-Function Transmission Range (TR) Switch	Left side of transmission. See Fig. 117 .

Audi A4 2005 - MISCELLANEOUS

Audi A4 2005 MISCELLANEOUS LOCATION

Component	Location
Amplifier (Avant)	Right side of cargo area. See Fig. 18 .
Amplifier (Sedan)	Right side of trunk. See Fig. 19 .
Antenna Splitter	Below front passenger's seat. See Fig. 21 .
Antenna (Telephone)	Right front of vehicle. See Fig. 20 .
Antenna 2 (Telephone)	Under right rear of vehicle. See Fig. 146 .
Diagnostic Connector (DLC)	Under left side of dash. See Fig. 1 .
Ignition Coil 1 With Power Output Stage (1.8L Turbo)	Top of engine. See Fig. 85 .
Ignition Coil 1 With Power Output Stage (3.0L)	Right side of engine. See Fig. 89 .
Ignition Coil 2 With Power Output Stage (1.8L Turbo)	Top of engine. See Fig. 86 .
Ignition Coil 2 With Power Output Stage (3.0L)	Right side of engine. See Fig. 90 .
Ignition Coil 3 With Power Output Stage (1.8L Turbo)	Top of engine. See Fig. 87 .
Ignition Coil 3 With Power Output Stage (3.0L)	Right side of engine. See Fig. 91 .
Ignition Coil 4 With Power Output Stage (1.8L Turbo)	Top of engine. See Fig. 88 .
Ignition Coil 4 With Power Output Stage (3.0L)	Left side of engine. See Fig. 92 .
Ignition Coil 5 With Power Output Stage (3.0L)	Left side of engine. See Fig. 93 .
Ignition Coil 6 With Power Output Stage (3.0L)	Left side of engine. See Fig. 94 .
Induction Coil (Anti-Theft Immobilizer)	Right side of steering column. See Fig. 95 .

Audi A4 2005 - CONNECTORS

Audi A4 2005 CONNECTORS LOCATION

Component	Location
T3a (1.8L Turbo) (3 Pin)	Rear of engine compartment. See Fig. 4 .
T3b (1.8L Turbo) (3 Pin)	Rear of engine compartment. See Fig. 2 .
T3b (3.0L) (3 Pin)	Rear of engine compartment. See Fig. 6 .
T3e (3.0L) (3 Pin)	Rear of engine compartment. See Fig. 7 .
T3 (1.8L Turbo) (3 Pin)	Rear of engine compartment. See Fig. 3 .
T3 (3.0L) (3 Pin)	Rear of engine compartment. See Fig. 5 .
T4a (3.0L) (4 Pin)	Rear of engine compartment. See Fig. 10 .
T4c (3.0L) (4 Pin)	Rear of engine compartment. See Fig. 9 .
T4 (1.8L Turbo) (4 Pin)	Rear of engine compartment. See Fig. 8 .
T6a (3.0L) (6 Pin)	Rear of engine compartment. See Fig. 13 .
T6 (1.8L Turbo) (6 Pin)	Rear of engine compartment. See Fig. 11 .
T6 (3.0L) (6 Pin)	Rear of engine compartment. See Fig. 12 .

Audi A4 2005 - GROUNDS

Audi A4 2005 GROUNDS LOCATION

Component	Location
G3	Right side of engine compartment. See Fig. 79 .
G11	Right rear of engine compartment. See Fig. 76 .
G12	Left rear of engine compartment. See Fig. 77 .
G18 (1.8L)	Right side of engine. See Fig. 75 .
G18 (3.0L)	Left rear of engine. See Fig. 78 .
G26	Left side of engine compartment. See Fig. 74 .
G32	Left kick panel. See Fig. 73 .
G43	Above right kick panel. See Fig. 71 .
G44	Above left kick panel. See Fig. 70 .
G50	Left side of luggage compartment. See Fig. 65 .
G73	Rear of roof. See Fig. 68 .
G77	Left "B" pillar. See Fig. 67 .
G78	Right "B" pillar. See Fig. 66 .
G347	Front of center console. See Fig. 72 .
G610	Under front of center console. See Fig. 69 .