2008 AUDI A6 & A6 Avant

Audi A6 2008 - BUZZERS, RELAYS & TIMERS

Audi A6 2008 BUZZERS, RELAYS & TIMERS LOCATION

Component	Location
Battery Switch-Off Relay	At battery positive post. See Fig. 18.
Brake Booster Relay	In left plenum chamber relay holder. See Fig. 19.
Brake Booster Relay (1.1)	In left plenum chamber E-box. See Fig. 34.
Coolant Circulation Pump Relay (1.2)	In left plenum chamber E-box. See Fig. 34.
Engine Component Power Supply Relay (2)	In left plenum chamber E-box. See Fig. 34.
Fuel Pump (FP) Relay (2)	In left plenum chamber E-box. See Fig. 34.
Headlight Washer Relay (2)	On 9-position relay & fuse panel. See Fig. 27.
Horn Relay (7)	On 9-position relay & fuse panel. See Fig. 27.
Level Control System Compressor Relay (2)	On right plenum chamber E-box relay panel. See Fig. 36.
Parking Aid Warning Buzzer (Except 8 Channel) (5)	At belt webbing guide. See Fig. 100.
Parking Aid Warning Buzzer (8 Channel) (6)	Behind driver's side storage compartment. See Fig. 100.
Power Supply Relay (Terminal 75x) (7.2)	On 9-position relay & fuse panel. See Fig. 27.
Rear Window Defogger Relay (1)	On relay & fuse panel in right side of luggage compartment. See Fig. 35.
Secondary Air Injection (AIR) Pump Relay (3)	On right plenum chamber E-box relay panel. See Fig. 36.
Starter Relay 2 (6)	On 9-position relay & fuse panel. See Fig. 27.
Starter Relay (4)	On 9-position relay & fuse panel. See Fig. 27.
Voltage Supply Terminal 15 (B+) Relay (1)	On 9-position relay & fuse panel. See Fig. 27.

Audi A6 2008 - CIRCUIT PROTECTION DEVICES

Audi A6 2008 CIRCUIT PROTECTION DEVICES LOCATION

Component	Location
Driver's Power Seat Adjustment Circuit Breaker 1	In vehicle electrical system control module. See Fig. 43.
Fuse Holder (E-Box) (2)	In left plenum chamber E-box. See Fig. 28.
Fuse Holder (Instrument Panel Left)	Under left side of dash. See Fig. 25.
Fuse Holder (Instrument Panel Right)	Under right side of dash.
Main Fuse Panel (E-Box) (1)	In right plenum chamber E-box. See Fig. 29.
Relay & Fuse Panel (Steering Cross Member)	Under left side of dash. See Fig. 25.
Relay Holder (E-Box) (3)	In left plenum chamber E-box. See Fig. 28.
4 Position Relay & Fuse Panel (2)	In right plenum chamber E-box. See Fig. 29.
9-Position Relay & Fuse Panel	Under left side of dash. See Fig. 25.

Audi A6 2008 - CONTROL UNITS

Audi A6 2008 CONTROL UNITS LOCATION

Component	Location
Access/Start Control Module	Base of steering column. See Fig. 10.
Airbag Control Module	Under front of center console. See Fig. 12.
Comfort System Central Control Module	Right rear of luggage compartment. See Fig. 26.
Coolant Fan Control (FC) Control Module (1)	On coolant fan. See Fig. 31.
Coolant Fan Control (FC) Control Module 2 (16)	On coolant fan 2. See Fig. 31.
Digital Sound System Control Module	Left rear of luggage compartment. See Fig. 38.
Door Control Module (Driver's/Front Passenger's)	In respective front door. See Fig. 39.
Door Control Module (Left/Right Rear)	In respective rear door. See Fig. 40.
Electronic Parking Brake Control Module	Right rear of luggage compartment. See Fig. 44.
Energy Management Control Module	Near spare tire, at negative cable from battery. See Fig. 45.
Engine Control Module (4.2L) (2)	In right plenum chamber. See Fig. 47.
Front Information Display Control Head Control Module	Above glove box. See Fig. 53.
Fuel Pump (FP) Control Module	Under right front luggage compartment floor. See Fig. 54.
Garage Door Opener Control Module	Under front bumper. See Fig. 24.
Headlight Range Control Module	Above glove box. See Fig. 78.
High-Intensity Gas Discharge Lamp Control Modules (Gas-Discharge Headlights)	Bottom of headlight assemblies. See Fig. 87.
Instrument Cluster Control Module	In instrument cluster. See Fig. 17.
Navigation System W/CD Drive Control Module (MMI)	Left rear of luggage compartment. See Fig. 96.
Parking Aid Control Module	Right side of luggage compartment. See Fig. 30.
Power Steering Control Module	On steering box. See Fig. 23.
Power Sunroof Control Module	Center front of roof. See Fig. 16.
Speech Input Control Module (MMI)	Left side of luggage compartment. See Fig. 105.
Steering Column Electronic Systems Control Module	Bottom of steering column. See Fig. 22.
Throttle Valve Control Module (3.2L) (10)	At rear of engine. See Fig. 48.
Throttle Valve Control Module (4.2L) (7)	At rear of engine. See Fig. 47.
Tire Pressure Monitoring Control Module	Above glove box. See Fig. 108.
Transmission Control Module (TCM)	Under transmission oil pan. See Fig. 109.
Vehicle Electrical System Control Module	Under left side of dash. See Fig. 112.
Vehicle Electrical System Control Module 2	Above glove box. See Fig. 113.
Wiper Motor Control Module	In left plenum chamber. See Fig. 114.

Audi A6 2008 - MOTORS

Audi A6 2008 MOTORS LOCATION

Component	Location
Air Flap Positioner	Back of lower air intake box. See Fig. 11.
Brake System Vacuum Pump	Left side of engine compartment. See Fig. 111.
Center Vent Adjustment Motor (19)	Left side of HVAC assembly. See Fig. 115.
Coolant Fan (1)	Behind right side of radiator. See Fig. 31.
Coolant Fan 2 (16)	Behind left side of radiator. See Fig. 31.
Coolant Pump	In center plenum. See Fig. 32.
Defroster Flap Motor (2)	Top right side of HVAC assembly. See Fig. 115.
Front Cold Air Flap Motor (13)	Right side of HVAC assembly. See Fig. 115.
High Pressure Pump (Left) (4.2L) (1)	Top left side of engine. See Fig. 46.
High Pressure Pump (Right) (4.2L) (16)	Top right side of engine. See Fig. 47.
High Pressure Pump (3.2L) (18)	Left front of engine. See Fig. 49.
Indirect Ventilation Flap Motor (17)	Left side of HVAC assembly. See Fig. 115.
Intake Flap Motor (4.2L) (13)	Front of engine. See Fig. 46.
Leak Detection Pump (LDP)	Above left rear wheel well. See Fig. 110.
Left Footwell Flap Motor (20)	Lower left side of HVAC assembly. See Fig. 115.
Left Front Upper Body Outlet Motor (25)	Upper left side of HVAC assembly. See Fig. 115.
Parking Brake Motor (Left/Right)	On respective rear caliper assembly. See Fig. 88.
Rear Footwell Vent Motor (14)	Lower right side of HVAC assembly. See Fig. 115.
Right Footwell Flap Motor (12)	Lower right side of HVAC assembly. See Fig. 115.
Right Front Upper Body Outlet Motor (1)	Right side of HVAC assembly. See Fig. 115.
Secondary Air Injection (AIR) Pump Motor (4.2L) (19)	Below right headlight assembly. See Fig. 47.
Variable Intake Manifold Runner Motor (4.2L) (13)	Front of motor. See Fig. 46.
Window Regulator Motor (Driver's/Front Passenger's)	In respective front door. See Fig. 94.

Audi A6 2008 - SENDING UNITS/SENSORS

Audi A6 2008 SENDING UNITS & SENSORS LOCATION

Component	Location
ABS Wheel Speed Sensor (Left/Right Front)	On respective front wheel hub. See Fig. 82.
ABS Wheel Speed Sensor (Left/Right Rear)	On respective rear wheel hub. See Fig. 89.
Accelerator Pedal Position Sender 2	Top of accelerator pedal assembly. See Fig. 102.
Accelerator Pedal Position Sender 2 (6)	On accelerator pedal assembly. See Fig. 49.
Air Quality Sensor (6)	Right side of HVAC assembly. See Fig. 115.
Brake Pad Wear Sensor (Left/Right Front)	At respective front brake caliper assemblies. See Fig. 83.
Brake Pressure Sensor 1	Integral to ABS hydraulic unit. See Fig. 21.
Camshaft Position (CMP) Sensor 2 (3.2L) (17)	Top of left cylinder bank. See Fig. 49.
Camshaft Position (CMP) Sensor 2 (4.2L) (10)	Top of left cylinder bank. See Fig. 46.
Camshaft Position (CMP) Sensor (3.2L) (21)	Top of right cylinder bank. See Fig. 48.
Camshaft Position (CMP) Sensor 3 (3.2L) (3)	On right cylinder bank. See Fig. 48.
Camshaft Position (CMP) Sensor 3 (4.2L) (18)	On right cylinder bank. See Fig. 47.
Camshaft Position (CMP) Sensor (4.2L) (12)	Top of right cylinder bank. See Fig. 47.
Camshaft Position (CMP) Sensor 4 (3.2L) (15)	Left side of engine. See Fig. 49.
Center Outlet Temperature Sensor (16)	Lower front of HVAC assembly. See Fig. 115.
Center Vent Motor Position Sensor (19)	Integral to center vent adjustment motor. See Fig. 115.
Clutch Position Sensor (1)	Top of clutch pedal assembly. See Fig. 51.
Defroster Flap Motor Position Sensor (2)	Integral to defroster flap motor. See Fig. 115.
Engine Coolant Temperature (ECT) Sensor (3.2L) (17)	Front of engine. See Fig. 48.
Engine Coolant Temperature (ECT) Sensor (4.2L) (6)	In coolant pipe at rear of engine compartment. See Fig. 47.
Engine Speed (RPM) Sensor (3)	Rear of engine. See Fig. 49.
Evaporator Vent Temperature Sensor (8)	Right side of HVAC assembly. See Fig. 115.
Front Airbag Crash Sensor (Driver's/Front Passenger's)	Near respective headlight assemblies. See Fig. 42.
Front Cold Air Flap Motor Position Sensor (13)	Integral to front cold air flap motor. See Fig. 115.
Front Parking Assistance Sensor (4) (1)	Behind front bumper. See Fig. 100.
Fuel Pressure Sensor (3.2L) (19)	Top left front of engine. See Fig. 49.
Fuel Pressure Sensor (4.2L) (9)	Top right front of engine. See Fig. 47.
Heated Oxygen Sensor (HO2S) Connector (1)	Under front of vehicle, near transmission. See Fig. 14.
Heated Oxygen Sensor (HO2S) 2 Connector (5)	Top of transmission. See Fig. 15.
Heated Oxygen Sensor (HO2S) 3 Connector (2)	Under front of vehicle, near transmission. See Fig. 14.
Heated Oxygen Sensor (HO2S) 4 Connector (4)	Top of transmission. See Fig. 15.
Indirect Ventilation Flap Motor Position Sensor (17)	Integral to indirect ventilation flap motor. See Fig. 115.
Intake Air Temperature (IAT) Sensor (3.2L) (12)	Rear of engine compartment. See Fig. 48.
Intake Air Temperature (IAT) Sensor (4.2L) (1)	Right side of engine compartment. See Fig. 47.
Intake Manifold Runner Position Sensor 2 (3.2L) (2)	Left rear of engine. See Fig. 49.
Intake Manifold Runner Position Sensor 2 (4.2L) (13)	Front of engine. See Fig. 46.
Intake Manifold Runner Position Sensor (3.2L) (19)	Right front of engine. See Fig. 48.
Intake Manifold Runner Position Sensor (4.2L) (13)	Front of engine. See Fig. 46.
Intake Manifold Tuning (IMT) Valve Position Sensor (15)	Front of engine. See Fig. 48.
Knock Sensor (KS) 1 (3.2L) (14)	Top right side of engine. See Fig. 48.
Knock Sensor (KS) 1 (4.2L) (11)	Top right front of engine. See Fig. 47.
Knock Sensor (KS) 2 (3.2L) (20)	Top left side of engine. See Fig. 49.
Knock Sensor (KS) 2 (4.2L) (8)	Top right side of engine. See Fig. 47.
Knock Sensor (KS) 3 (4.2L) (11)	Top left front of engine. See Fig. 46.
Knock Sensor (KS) 4 (4.2L) (12)	Top left rear of engine. See Fig. 46.
Left Footwell Flap Motor Position Sensor (20)	Integral to left footwell flap motor. See Fig. 115.
Left Front Upper Body Outlet Position Sensor (25)	Integral to left front upper body outlet motor. See Fig. 115.
Left Vent Temperature Sensor (24)	Upper left side of HVAC assembly. See Fig. 115.
Level Control System Sensor (Left Front)	At left side of front axle. See Fig. 84.
Level Control System Sensor (Left Rear)	At left side of rear axle. See Fig. 90.
Low Fuel Pressure Sensor (3.2L) (18)	Left front of engine. See Fig. 49.
Low Pressure Sensor (4.2L) (2)	Left side of engine. See Fig. 46.
Manifold Absolute Pressure (MAP) Sensor (12)	Rear of engine compartment. See Fig. 48.
MAP Controlled Engine Cooling Thermostat (2)	Lower left front of engine. See Fig. 52.
Mass Air Flow (MAF) Sensor (4.2L) (1)	Right side of engine compartment. See Fig. 47.
Oil Level Thermal Sensor	Bottom of engine oil pan. See Fig. 97.
Outside Air Temperature Sensor	Behind lower front grille. See Fig. 99.
Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) Connector (3)	Top of transmission. See Fig. 15.
Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) Connector (6)	Top of transmission. See Fig. 15.
Oxygen Sensor (O2S) 3 Behind Three Way Catalytic Converter (TWC) Connector (2)	Top of transmission. See Fig. 15.
Oxygen Sensor (O2S) 4 Behind Three Way Catalytic Converter (TWC) Connector (1)	Top of transmission. See Fig. 15.
Rain/Light Recognition Sensor	In rearview mirror mount. See Fig. 101.
Rear Footwell Vent Motor Position Sensor (14)	Integral to rear footwell vent motor. See Fig. 115.
Rear Parking Assistance Sensor (4) (4)	Behind rear bumper. See Fig. 100.
Right Footwell Flap Motor Position Sensor (12)	Integral to right footwell flap motor. See Fig. 115.
Right Front Upper Body Outlet Position Sensor (1)	Integral to right front upper body outlet motor. See Fig. 115.
Right Vent Temperature Sensor (3)	Right side of HVAC assembly. See Fig. 115.
Side Air Bag Crash Sensor (Driver's/Front Passenger's Side)	In respective front door. See Fig. 33.
Side Air Bag Crash Sensor (Left/Right Rear)	At bottom of respective "C" pillar. See Fig. 91.
Throttle Position (TP) Sensor (6)	On accelerator pedal assembly. See Fig. 49.
Tire Pressure Sensors (4)	On tire rims. See Fig. 85.
Transmission Output RPM Sender	Under transmission oil pan. See Fig. 103.
Transmission RPM Sensor	Under transmission oil pan. See Fig. 104.

Audi A6 2008 - SOLENOIDS & SOLENOID VALVES

Audi A6 2008 SOLENOIDS & SOLENOID VALVES LOCATION

Component	Location
ABS Hydraulic Unit	Left side of engine compartment. See Fig. 9.
A/C Compressor Regulation Valve	Rear of compressor. See Fig. 8.
Camshaft Adjustment Valve 1 (Exhaust) (3.2L) (8)	Right rear of engine. See Fig. 48.
Camshaft Adjustment Valve 1 (Exhaust) (4.2L) (3)	Right rear of engine. See Fig. 47.
Camshaft Adjustment Valve 1 (3.2L) (9)	Right rear of engine. See Fig. 48.
Camshaft Adjustment Valve 1 (4.2L) (5)	Right rear of engine. See Fig. 47.
Camshaft Adjustment Valve 2 (Exhaust) (3.2L) (12)	Left rear of engine. See Fig. 49.
Camshaft Adjustment Valve 2 (Exhaust) (4.2L) (6)	Left rear of engine. See Fig. 46.
Camshaft Adjustment Valve 2 (3.2L) (11)	Left rear of engine. See Fig. 49.
Camshaft Adjustment Valve 2 (4.2L) (4)	Left rear of engine. See Fig. 46.
Cylinder 1, 2 & 3 Fuel Injectors (3.2L) (20)	On right cylinder bank. See Fig. 48.
Cylinder 1, 2, 3 & 4 Fuel Injectors (4.2L)	On right cylinder bank.
Cylinder 4, 5 & 6 Fuel Injectors (3.2L) (1)	On left cylinder bank. See Fig. 49.
Cylinder 5, 6, 7 & 8 Fuel Injectors (4.2L)	On left cylinder bank.
Electro-Hydraulic Engine Mount Solenoid Valve (Left) (14)	Left front of engine compartment. See Fig. 49.
Electro-Hydraulic Engine Mount Solenoid Valve (Right) (1)	Right front of engine compartment. See Fig. 48.
Evaporative Emissions (EVAP) Canister Purge Solenoid Valve 2 (4.2L) (3)	Left rear of engine compartment. See Fig. 46.
Evaporative Emissions (EVAP) Canister Purge Solenoid Valve (3.2L) (11)	At rear of engine compartment. See Fig. 48.
Evaporative Emissions (EVAP) Canister Purge Solenoid Valve (4.2L) (3)	At rear of engine. See Fig. 46.
Fuel Metering Valve 2 (4.2L) (9)	Top left side of engine. See Fig. 46.
Fuel Metering Valve (3.2L) (18)	Left front of engine. See Fig. 49.
Fuel Metering Valve (4.2L) (15)	Top right side of engine. See Fig. 47.
Heat Regulating Valve (Left/Right)	In center plenum. See Fig. 32.
Intake Air Switch-Over Valve (3.2L) (2)	Right side of engine compartment. See Fig. 48.
Intake Air Switch-Over Valve (4.2L) (20)	Right side of engine compartment. See Fig. 47.
Intake Manifold Change-Over Actuator (18)	Front of engine. See Fig. 48.
Intake Manifold Flap Change-Over Valve (16)	Front of engine. See Fig. 48.
Intake Manifold Runner Control (IMRC) Valve (13)	Rear of engine. See Fig. 48.

Audi A6 2008 - SWITCHES

Audi A6 2008 SWITCHES LOCATION

Component	Location
Brake Fluid Level Warning Switch	On brake reservoir. See Fig. 20.
Brake Light Switch (3)	On brake pedal assembly. See Fig. 51.
Brake Pedal Switch (3)	On brake pedal assembly. See Fig. 51.
Clutch Pedal Starter Interlock Switch (2)	Top of clutch pedal assembly. See Fig. 51.
Engine Coolant Level Warning Switch	In engine coolant reservoir. See Fig. 50.
Multi-Function Transmission Range (TR) Switch	On transmission. See Fig. 95.
Oil Pressure Switch	Center front of engine. See Fig. 98.

Audi A6 2008 - MISCELLANEOUS

Audi A6 2008 MISCELLANEOUS LOCATION

Component	Location
Access/Start Authorization Antenna (Driver's)	In left rear door. See Fig. 41.
Access/Start Authorization Antenna (Front Passenger's)	Rear of luggage compartment. See Fig. 93.
Alarm Horn	In right plenum chamber. See Fig. 13.
Auxiliary Air Heating Element (11)	Right side of HVAC assembly. See Fig. 115.
Battery Interrupt Igniter	Right side of luggage compartment, at battery positive lead. See Fig. 80.
Data Bus On Board Diagnostic Interface	Above glove box. See Fig. 37.
Headlamp Power Output Stage (Gas-Discharge Headlamps)	At headlight assembly. See Fig. 86.
High Tone Horn	Behind front grille. See Fig. 79.
Ignition Coil W/Power Output Stage 1, 2 & 3 (3.2L) (22)	Top of right cylinder bank. See Fig. 48.
Ignition Coil W/Power Output Stage 1, 2, 3 & 4 (4.2L) (17)	Top of right cylinder bank. See Fig. 47.
Ignition Coil W/Power Output Stage 4, 5 & 6 (3.2L) (16)	Top of left cylinder bank. See Fig. 49.
Ignition Coil W/Power Output Stage 5, 6, 7 & 8 (4.2L) (8)	Top of left cylinder bank. See Fig. 46.
Keyless Access Authorization Antenna Reader	Above glove box. See Fig. 81.
Low Tone Horn	Behind front grille. See Fig. 92.
Suppressor	In right plenum chamber E-box. See Fig. 106.
Tire Pressure Monitoring Antenna	In roof, near rear passenger overhead lights. See Fig. 107.

Audi A6 2008 - CONNECTORS

Audi A6 2008 CONNECTORS LOCATION

Component	Location
T3e (Gray, 3 Pin)	Left rear of engine compartment, on bulkhead. See Fig. 1.
T4a (Black, 4 Pin)	Right rear of engine compartment, on bulkhead. See Fig. 2.
T4b (Brown, 4 Pin)	Left rear of engine compartment, on bulkhead. See Fig. 3.
T6a (3.2L) (Black, 6 Pin)	Right rear of engine compartment, on bulkhead. See Fig. 6.
T6a (4.2L) (Black, 6 Pin)	Right rear of engine compartment, on bulkhead. See Fig. 7.
T6b (3.2L) (Black, 6 Pin)	Left rear of engine compartment, on bulkhead. See Fig. 5.
T6b (4.2L) (6 Pin)	Left rear of engine compartment, on bulkhead. See Fig. 4.

Audi A6 2008 - GROUNDS

Audi A6 2008 GROUNDS LOCATION

Component	Location
G12	Left chassis, forward of front axle. See Fig. 55.
G13	Right chassis, forward of front axle. See Fig. 56.
G18	Right front of engine block. See Fig. 57.
G32	Under left end of dash. See Fig. 76.
G33	Under right end of dash. See Fig. 66.
G43	Behind right kick panel. See Fig. 65.
G44	Behind left kick panel. See Fig. 75.
G45	Behind center of dash. See Fig. 77.
G50	On left rear wheelwell. See Fig. 72.
G51	On right rear wheelwell. See Fig. 70.
G77	Base of left "B" pillar. See Fig. 73.
G78	Base of right "B" pillar. See Fig. 67.
G607	In left plenum chamber. See Fig. 58.
G614	Right side of engine compartment, on chassis. See Fig. 59.
G617	Base of right "A" pillar. See Fig. 64.
G645	Left side of firewall. See Fig. 60.
G646	Right side of firewall. See Fig. 61.
G647	Left side of firewall. See Fig. 62.
G657	Above left rear window. See Fig. 71.
G659	Above right rear window. See Fig. 69.
G670	Base of left "A" pillar. See Fig. 74.
G671	Left side of engine compartment, on chassis. See Fig. 63.
G690	On rear center roof frame. See Fig. 68.