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Wiring Diagram AUDI TT 2008 - Battery - Starter - Battery isolation igniter
| A | Battery |
| B | Starter |
| J104 | ABS control unit |
| J234 | Airbag control unit |
| N253 | Battery isolation igniter |
| SD1 | Fuse 1 on fuse holder D |
| SD2 | Fuse 2 on fuse holder D |
| SD3 | Fuse 3 on fuse holder D |
| T2b | 2-pin connector |
 ">T47 | "> 47-pin connector |
| T75 | 75-pin connector |
| U6 | Jump start socket |
| 40 | Earth point, under rear right seat |
| B299 | Positive connection 3 (30), in main wiring harness |
| B300 | Positive connection 4 (30), in main wiring harness |
| B301 | Positive connection 5 (30), in main wiring harness |
| P2 | Positive connection (30), in battery wiring harness |
| P4 | Positive connection 2 (30) in battery wiring harness |
| * | Main fuse box, on battery on rear right in luggage compartment |
| *2 | Only models with jump start socket |
| *3 | Only models with energy recovery |
| *4 | see applicable current flow diagram |
Wiring Diagram AUDI TT 2008 - Alternator
| C | Alternator |
| C1 | Voltage regulator |
| J519 | Onboard supply control unit |
| SA1 | Fuse 1 in fuse holder A |
| SA2 | Fuse 2 in fuse holder A |
| SA3 | Fuse 3 in fuse holder A |
| SA4 | Fuse 4 in fuse holder A |
| SA5 | Fuse 5 in fuse holder A |
| SA6 | Fuse 6 in fuse holder A |
| SA7 | Fuse 7 in fuse holder A |
| SA8 | Fuse 8 in fuse holder A |
| T2 | 2-pin connector |
| T4a | 4-pin connector, front left in engine compartment |
| T8h | 8-pin connector |
| T52c | 52-pin connector |
| 14 | Earth point, on gearbox |
| 671 | Earth point 1, on front of left longitudinal member |
| B272 | Positive connection (30), in main wiring harness |
| B344 | Connection 1 (61), in main wiring harness |
| * | Main fuse carrier, in E-box on left of plenum chamber |
| *2 | Only models with energy recovery |
| *3 | see applicable current flow diagram |
| *4 | Up to May 2009 |
| *5 | From June 2009 |
| *6 | From June 2010 |
Wiring Diagram AUDI TT 2008 - Terminal 50 voltage supply relay
| J104 | ABS control unit |
| J519 | Onboard supply control unit |
| J681 | Terminal 15 voltage supply relay 2 |
| J682 | Terminal 50 voltage supply relay, Relay carrier on left under dash panel |
| SC1 | Fuse 1 on fuse holder C |
| SC2 | Fuse 2 on fuse holder C |
| SC4 | Fuse 4 on fuse holder C |
| SC7 | Fuse 7 on fuse holder C |
| SC11 | Fuse 11 on fuse holder C |
| SC29 | Fuse 29 on fuse holder C |
| SC31 | Fuse 31 on fuse holder C |
| T2t | 2-pin connector |
| ">T47 | "> 47-pin connector |
| 44 | Earth point, lower part of left A-pillar |
| 374 | Earth connection 9, in main wiring harness |
| 375 | Earth connection 10, in main wiring harness |
| B163 | Positive connection 1 (15), in interior wiring harness |
| B277 | Positive connection 1 (15a) in main wiring harness |
| B283 | Positive connection 7 (15a) in main wiring harness |
| * | Relay carrier on onboard supply control unit, on left under dash panel |
| *2 | see applicable current flow diagram for basic equipment |
| *3 | From June 2009 |
| *4 | Up to May 2009 |
| *5 | Only models with sport program button |
| *6 | From September 2009 |
Wiring Diagram AUDI TT 2008 - Engine component current supply relay
| J757 | Engine component current supply relay |
| ST1 | Fuse carrier 1 |
| ST2 | Fuse carrier 2 |
| SB6 | Fuse 6 on fuse holder B |
| SB7 | Fuse 7 on fuse holder B |
| SB8 | Fuse 8 on fuse holder B |
| SB9 | Fuse 9 on fuse holder B |
| SB10 | Fuse 10 on fuse holder B |
| SB11 | Fuse 11 on fuse holder B |
| SB12 | Fuse 12 on fuse holder B |
| B352 | Positive connection 3 (87a) in main wiring harness |
| B353 | Positive connection 4 (87a) in main wiring harness |
| * | Relay and fuse carrier, in E-box in engine compartment |
Wiring Diagram AUDI TT 2008 - Suppression filter - Main relay - Engine control unit
| C24 | Suppression filter |
| J271 | Main relay |
| J623 | Engine control unit |
| SC32 | Fuse 32 on fuse holder C |
| SC36 | Fuse 36 on fuse holder C |
| T94 | 94-pin connector |
| 366 | Earth connection 1, in main wiring harness |
| 379 | Earth connection 14, in main wiring harness |
| 672 | Earth point 2, on front of left longitudinal member |
| B298 | Positive connection 2 (30), in main wiring harness |
| * | Relay and fuse carrier, in E-box in engine compartment |
Wiring Diagram AUDI TT 2008 - Engine control unit
| E45 | Cruise control system switch |
| J527 | Steering column electronics control unit |
| J533 | Data bus diagnostic interface |
| J623 | Engine control unit |
| J743 | Mechatronic unit for dual clutch gearbox |
| T16 | 16-pin connector |
| T20c | 20-pin connector |
| T20d | 20-pin connector |
| T20e | 20-pin connector |
| T94 | 94-pin connector |
| B351 | Positive connection 2 (87a) in main wiring harness |
| B383 | Connection 1 (powertrain CAN bus, high), in main wiring harness |
| B390 | Connection 1 (powertrain CAN bus, low), in main wiring harness |
| B444 | Connection 1 (diagnosis), in main wiring harness |
| * | Only models with cruise control system (CCS) |
| *2 | Diagnostic connection |
| *3 | Data bus wire (CAN bus) |
| *4 | Only models with dual clutch gearbox 02E |
| *5 | Up to May 2008 |
Wiring Diagram AUDI TT 2008 - Engine control unit - Ignition coil 1 with output stage
| J623 | Engine control unit |
| N70 | Ignition coil 1 with output stage |
| N127 | Ignition coil 2 with output stage |
| N291 | Ignition coil 3 with output stage |
| N292 | Ignition coil 4 with output stage |
| P | Spark plug connector |
| Q | Spark plugs |
| T4h | 4-pin connector |
| T4i | 4-pin connector |
| T4k | 4-pin connector |
| T4l | 4-pin connector |
| T14 | 14-pin connector, front left in engine compartment |
| T60 | 60-pin connector |
| 15 | Earth point, on cylinder head |
| 85 | Earth connection 1, in engine compartment wiring harness |
| 131 | Earth connection 2, in engine compartment wiring harness |
| D52 | Positive connection (15a), in engine compartment wiring harness |
Wiring Diagram AUDI TT 2008 - Engine control unit - Injector - cylinder 1 - Injector - cylinder 2 - Injector - cylinder 3 - Injector - cylinder 4
| J623 | Engine control unit |
| N30 | Injector, cylinder 1 |
| N31 | Injector, cylinder 2 |
| N32 | Injector, cylinder 3 |
| N33 | Injector, cylinder 4 |
| T8i | 8-pin connector, near injectors |
| T14 | 14-pin connector, front left in engine compartment |
| T60 | 60-pin connector |
| 85 | Earth connection 1, in engine compartment wiring harness |
Wiring Diagram AUDI TT 2008 - Air mass meter - Accelerator position sender - Engine control unit
| G70 | Air mass meter |
| G79 | Accelerator position sender |
| G185 | Accelerator position sender 2 |
| J623 | Engine control unit |
| T5b | 5-pin connector |
| T6o | 6-pin connector |
| T12m | 12-pin connector, in luggage compartment, rear right |
| T94 | 94-pin connector |
| B486 | Connection 22, in main wiring harness |
| * | From June 2007 |
| *2 | According to equipment |
| *3 | Up to May 2007 |
Wiring Diagram AUDI TT 2008 - Throttle valve module - Engine control unit
| G186 | Throttle valve drive for electric throttle |
| G187 | Throttle valve drive angle sender 1 for electric throttle |
| G188 | Throttle valve drive angle sender 2 for electric throttle |
| J338 | Throttle valve module |
| J623 | Engine control unit |
| T6b | 6-pin connector |
| T60 | 60-pin connector |
| * | gradual introduction |
Wiring Diagram AUDI TT 2008 - Charge pressure sender - Radiator outlet coolant temperature sender - Intake manifold flap potentiometer - Fuel pressure sender for low-pressure - Engine control unit
| G31 | Charge pressure sender |
| G83 | Radiator outlet coolant temperature sender |
| G336 | Intake manifold flap potentiometer |
| G410 | Fuel pressure sender for low-pressure |
| J623 | Engine control unit |
| T4s | 4-pin connector, front left in engine compartment |
| T14 | 14-pin connector, front left in engine compartment |
| T60 | 60-pin connector |
| T94 | 94-pin connector |
| V157 | Intake manifold flap motor |
| 220 | Earth connection (sender earth), in engine wiring harness |
| B466 | Connection 2, in main wiring harness |
| D101 | Connection 1 in engine compartment wiring harness |
Wiring Diagram AUDI TT 2008 - Hall sender - Intake air temperature sender - Coolant temperature sender - Fuel pressure sender - Engine control unit
| G40 | Hall sender |
| G42 | Intake air temperature sender |
| G62 | Coolant temperature sender |
| G247 | Fuel pressure sender |
| J623 | Engine control unit |
| T6p | 6-pin connector, on front of engine |
| T60 | 60-pin connector |
| 220 | Earth connection (sender earth), in engine wiring harness |
| D102 | Connection 2 in engine compartment wiring harness |
Wiring Diagram AUDI TT 2008 - Engine speed sender - Knock sensor 1 - Knock sensor 2 - Engine control unit
| G28 | Engine speed sender |
| G61 | Knock sensor 1 |
| G66 | Knock sensor 2 |
| J623 | Engine control unit |
| T3f | 3-pin connector, green |
| T3g | 3-pin connector, brown |
| T3h | 3-pin connector, grey |
| T60 | 60-pin connector |
| D103 | Connection 3 in engine compartment wiring harness |
Wiring Diagram AUDI TT 2008 - Engine control unit - Charge pressure control solenoid valve - Activated charcoal filter solenoid valve 1 - Camshaft control valve 1 - Turbocharger air recirculation valve - Fuel pressure regulating valve - Variable intake manifold changeover valve
| J623 | Engine control unit |
| N75 | Charge pressure control solenoid valve |
| N80 | Activated charcoal filter solenoid valve 1 |
| N205 | Camshaft control valve 1 |
| N249 | Turbocharger air recirculation valve |
| N276 | Fuel pressure regulating valve |
| N335 | Variable intake manifold changeover valve |
| T14 | 14-pin connector, front left in engine compartment |
| T60 | 60-pin connector |
| T94 | 94-pin connector |
| D106 | Connection 4 in engine compartment wiring harness |
| * | According to equipment |
Wiring Diagram AUDI TT 2008 - Lambda probe - Lambda probe after catalytic converter - Engine control unit
| G39 | Lambda probe |
| G130 | Lambda probe after catalytic converter |
| J623 | Engine control unit |
| T4b | 4-pin connector, black |
| T6c | 6-pin connector, black |
| T94 | 94-pin connector |
| Z19 | Lambda probe heater |
| Z29 | Lambda probe 1 heater after catalytic converter |
Wiring Diagram AUDI TT 2008 - Brake light switch - Clutch position sender - Engine control unit
| F | Brake light switch |
| F47 | Brake pedal switch |
| G476 | Clutch position sender |
| J104 | ABS control unit |
| J519 | Onboard supply control unit |
| J623 | Engine control unit |
| T4t | 4-pin connector |
| T5h | 5-pin connector |
| ">T47 | "> 47-pin connector |
| T94 | 94-pin connector |
| 371 | Earth connection 6, in main wiring harness |
| 372 | Earth connection 7, in main wiring harness |
| B335 | Connection 1 (54), in main wiring harness |
| * | see applicable current flow diagram for basic equipment |
| *2 | Only models with manual gearbox |
| *3 | From June 2007 |
| *4 | Up to May 2007 |
Wiring Diagram AUDI TT 2008 - Continued coolant circulation relay - Engine control unit - Fuel system diagnostic pump
| J151 | Continued coolant circulation relay |
| J623 | Engine control unit |
| T4s | 4-pin connector, front left in engine compartment |
| T94 | 94-pin connector |
| V51 | Continued coolant circulation pump |
| V144 | Fuel system diagnostic pump |
| * | Only models with fuel system diagnostic pump |
| *2 | Relay and fuse carrier, in E-box in engine compartment |
Wiring Diagram AUDI TT 2008 - Radiator fan control unit - Fuel pump control unit - Engine control unit - Radiator fan
| J293 | Radiator fan control unit |
| J538 | Fuel pump control unit |
| J623 | Engine control unit |
| SF6 | Fuse 6 in fuse holder F |
| SF8 | Fuse 8 in fuse holder F |
| T4c | 4-pin connector |
| T10k | 10-pin connector |
| T94 | 94-pin connector |
| V7 | Radiator fan |
| V177 | Radiator fan 2 |
| 672 | Earth point 2, on front of left longitudinal member |
Wiring Diagram AUDI TT 2008 - Fuel gauge sender - Fuel system pressurisation pump - Control unit in dash panel insert - Fuel pump control unit
| G | Fuel gauge sender |
| G1 | Fuel gauge |
| G6 | Fuel system pressurisation pump |
| J285 | Control unit in dash panel insert |
| J519 | Onboard supply control unit |
| J538 | Fuel pump control unit |
| T10k | 10-pin connector |
| T11b | 11-pin connector |
| T32 | 32-pin connector |
| T52b | 52-pin connector |
| 43 | Earth point, lower part of right A-pillar |
| 390 | Earth connection 25, in main wiring harness |
| 410 | Earth connection 1 (sender earth) in main wiring harness |
| * | From June 2009 |
| *2 | Output for sender earth |
| *3 | Up to May 2009 |
Wiring Diagram AUDI TT 2008 - Oil pressure switch - Coolant shortage indicator switch - Oil level and oil temperature sender - Control unit in dash panel insert
| F1 | Oil pressure switch |
| F66 | Coolant shortage indicator switch |
| G266 | Oil level and oil temperature sender |
| J285 | Control unit in dash panel insert |
| J533 | Data bus diagnostic interface |
| K3 | Oil pressure warning lamp |
| K28 | Coolant temperature and coolant shortage warning lamp |
| T6a | 6-pin connector, front left in engine compartment |
| T14 | 14-pin connector, front left in engine compartment |
| T20d | 20-pin connector |
| T32 | 32-pin connector |
| Y24 | Display in dash panel insert |
| 410 | Earth connection 1 (sender earth) in main wiring harness |
| B278 | Positive connection 2 (15a) in main wiring harness |
| * | Data bus wire (CAN bus) |
Wiring Diagram AUDI TT 2008 - Control unit for structure-borne sound - Actuator for structure-borne sound
| J869 | Control unit for structure-borne sound |
| R214 | Actuator for structure-borne sound |
| T12s | 12-pin connector |
| 44 | Earth point, lower part of left A-pillar |
| 376 | Earth connection 11, in main wiring harness |
| * | Data bus wire (CAN bus) |
| *2 | Only models with sport program button |
| *3 | From September 2009 |
AUDI TT 2008
AUDI TT 2008 Routing rear lid/roof
| Routing rear lid/roof |
| 1 - | Aerial wires to right A-pillar |
| 2 - | Coupling station right rear lid, in rear right roof frame |
| 3 - | Transition rear lid to luggage compartment |
| 5 - | Radio, telephone and navigation system aerial -R52- |
| 8 - | Aerial amplifier 2 -R111- on rear lid bottom right |
| Left number plate light -X4-/Right number plate light -X5- |
| 10 - | Aerial connections aerial amplifier for mobile telephone -R86- |
| Aerial connectionssatellite radio -R146-, only USA |
| 11 - | Coupling station left rear lid behind side panel |
| 12 - | Transition rear lid to luggage compartment |
| 13 - | Wiring harness to left A-pillar |
| 14 - | Front interior light -W1- |
| 15 - | Sun blind, right illuminated vanity mirror |
| Routing door |
| Door coupling - A-pillar 20-pin connector -T20a-/20-pin connector -T20b- |
| Front left mid-range loudspeaker -R103-/front right mid-range loudspeaker -R104- |
| Driver side interior locking button for central locking system -E308-/front passenger side interior locking button -E309- |
| Mirror adjustment switch -E43-/mirror adjustment changeover switch -E48- |
| Operating unit for window regulator in driver door -E512-/window regulator switch in front passenger door -E107- |
| Alarm system off switch -E217-/interior monitoring switch -E183- |
| Driver side central locking lock unit -F220-/Rear left central locking lock unit -F222- |
| Side airbag crash sensor on driver side -G179-/side airbag crash sensor on front passenger side -G180- |
| 9 - | Driver door control unit -J386-/front passenger side door control unit -J387- |
| 10 - | Driver door control unit -J386-/front passenger side door control unit -J387- |
| Fuel tank flap release button -E319-/rear lid remote release button -E233- |
| Front left bass loudspeaker -R21-/front right bass loudspeaker -R23- |
| Routing dash panel wiring harness |
| 1 - | Wiring harness to A-pillar, left roof |
| 5 - | Photosensor for sunlight intensity -G107- |
| 7 - | 9 - | CD changer -R41- |
| 17 - | Chip card reader unit -R99- |
| 24 - | Light switches -E1- |
| 25 - | Wiring harness from A-pillar to luggage compartment, left |
| 26 - | CAN bus connection |
| 27 - | Coupling driver door 20-pin connector -T20a- |
| 28 - | Left A-pillar duct |
| 29 - | Fuse holder on left in dash panel |
| 30 - | Wiring harness, duct interior - engine compartment |
| Routing in the interior |
| 1 - | Wiring harness to right A-pillar |
| 2 - | Coupling station under front passenger seat |
| 3 - | Electronically controlled damping control unit -J250- |
| 7 - | Rear right mid-range and bass loudspeaker -R160- |
| 8 - | Wiring harness to rear light, control unit in luggage compartment right |
| 9 - | Earth wire battery -A- |
| 10 - | Wiring harness under rear seat |
| 11 - | Cable from battery isolation igniter -N253- in luggage compartment to starter -B- |
| 12 - | Connections right tail light and right in luggage compartment control units |
| 13 - | battery -A- with main fuse box and battery isolation igniter -N253- in luggage compartment, rear right |
| 14 - | Wiring harness to digital sound package control unit -J525- and left tail light |
| 21 - | Centre loudspeaker -R148- |
| Plenum chamber - engine compartment wiring harness routing |
| 5 - | Alarm horn -H12- |
| 6 - | Engine control unit -J623- |
| 7 - | Wiring harness to clutch Lambda probe |
| 8 - | Coupling Lambda probes on underbody |
| 9 - | Starter cable under vehicle floor |
| 10 - | Wiring harness in plenum chamber from engine control unit -J623- |
| 11 - | Duct to dash panel left |
| 12 - | Transition to dash panel left |
| 13 - | Cable channel in left engine compartment |
| 14 - | Electronics box engine compartment |
| 15 - | Engine prewiring |
| 16 - | Wiring harness engine compartment left to headlight |
| Front airbag crash sensor -G190-/front airbag crash sensor on driver side -G283-/front airbag crash sensor on front passenger side -G284-, only USA |
| 18 - | Low tone horn -H7- |
