Wiring Diagram AUDI TT 1999 - Battery - starter - alternator - ignition/starter switch - main fuse box/battery
| A | Battery |
| B | Starter |
| C | Alternator |
| C1 | Voltage regulator |
| D | Ignition/starter switch |
| F18 | Radiator fan thermo-switch |
| J104 | ABS with EDL control unit |
| J226 | Starter inhibitor and reversing light relay |
| S131 | Fuse 1 |
| S132 | Fuse 2 |
| S133 | Fuse 3 |
| S134 | Fuse 4 |
| S138 | Fuse 5 |
| S162 | Fuse -1- (30), in battery fuse box |
| S163 | Fuse -2- (30), in battery fuse box |
| S164 | Fuse -3- (30), in battery fuse box |
| T2f | 2-pin connector, cable channel, in engine compartment, left |
| T3e | 3-pin connector, black, on main fuse box/battery |
| T6m | 6-pin connector, brown, in plenum chamber |
| T25 | 25-pin connector, on ABS control unit |
| 2 | Earth strap, gearbox - body |
| 12 | Earth point, in engine compartment, left |
| * | Only models with manual gearbox |
| ** | Only models with automatic gearbox |
Wiring Diagram AUDI TT 1999 - Motronic control unit - fuel pump relay - injectors - brake light switch - clutch pedal switch
| C10 | Suppression filter |
| D | Ignition/starter switch |
| F | Brake light switch |
| F36 | Clutch pedal switch |
| F47 | Cruise control system brake pedal switch |
| J17 | Fuel pump relay |
| J220 | Motronic control unit |
| J492 | Four-wheel drive control unit |
| N30 | Injector, cylinder 1 |
| N31 | Injector, cylinder 2 |
| N32 | Injector, cylinder 3 |
| N33 | Injector, cylinder 4 |
| S5 | Fuse in fuse box |
| S13 | Fuse in fuse box |
| T8d | 8-pin connector, on four-wheel drive control unit |
| T10a | 10-pin connector, green, in plenum chamber |
| T10e | 10-pin connector, black, in plenum chamber |
| T10x | 10-pin connector, orange, in plenum chamber |
| A2 | Positive (+) connection (15), in dash panel wiring harness |
| B131 | Connection (54), in interior wiring harness |
| B135 | Connection (15a), in interior wiring harness |
| D140 | Connection (injectors), in engine prewiring wiring harness |
| * | Models with manual gearbox |
| ** | Models with quattro four-wheel drive |
Wiring Diagram AUDI TT 1999 - Motronic control unit - power assisted steering pressure switch - cruise control system - accelerator pedal position senders
| C22 | Interference suppression choke for airbag |
| E3 | Hazard warning light switch |
| E45 | Cruise control system switch |
| F88 | Power assisted steering pressure switch |
| G79 | Accelerator pedal position sender |
| G185 | Accelerator pedal position sender -2- |
| J217 | Automatic gearbox control unit |
| J220 | Motronic control unit |
| J234 | Airbag control unit |
| J429 | Central locking control unit |
| T7 | 7-pin connector, behind steering column switch trim |
| T10e | 10-pin connector, black, in plenum chamber |
| T10g | 10-pin connector, blue, in plenum chamber |
| 85 | Earth connection -1-, in engine compartment wiring harness |
| A125 | Connection (crash signal), in dash panel wiring harness |
| B135 | Connection (15a), in interior wiring harness |
| • | CAN bus (data wire) |
| * | Models with cruise control system |
Wiring Diagram AUDI TT 1999 - Motronic control unit - lambda probe - air mass meter - activated charcoal filter system solenoid valve - charge pressure control solenoid valve - turbocharger divert air valve
| G39 | Lambda probe |
| G70 | Air mass meter |
| J104 | ABS with EDL control unit |
| J220 | Motronic control unit |
| J492 | Four-wheel drive control unit |
| N75 | Charge pressure control solenoid valve |
| N80 | Activated charcoal filter system solenoid valve I (pulsed) |
| N249 | Turbocharger divert air valve |
| S10 | Fuse in fuse box |
| T4 | 4-pin connector, in engine compartment, right |
| T6m | 6-pin connector, brown, in plenum chamber |
| T8d | 8-pin connector, on four-wheel drive control unit |
| T10a | 10-pin connector, green, in plenum chamber |
| T25 | 25-pin connector, on ABS control unit |
| Z19 | Lambda probe heater |
| A98 | Positive (+) connection -4- (30), in dash panel wiring harness |
| A121 | Connection (high bus), in dash panel wiring harness |
| A122 | Connection (low bus), in dash panel wiring harness |
| B156 | Positive (+) connection -4- (30), in interior wiring harness |
| D80 | Positive (+) connection (87a - for active. charcoal filter system solenoid), in engine compartment wiring harness |
| • | CAN bus (Data bus) |
| * | Only models with quattro four-wheel drive |
Wiring Diagram AUDI TT 1999 - Motronic control unit - engine speed sender - intake manifold pressure sender - Hall sender - knock sensor 1
| E87 | Control and display unit for air conditioner/Climatronic |
| G28 | Engine speed sender |
| G61 | Knock sensor 1 |
| G71 | Intake manifold pressure sender |
| G163 | Hall sender 2 |
| J220 | Motronic control unit |
| J293 | Radiator fan control unit |
| T3c | 3-pin connector, brown, in engine compartment, left |
| T3d | 3-pin connector, grey, in engine compartment, left |
| T10p | 10-pin connector, behind dash panel, right |
| T10x | 10-pin connector, orange, in plenum chamber |
| 220 | Earth connection (sender earth), in engine wiring harness |
| A45 | Connection (engine speed signal), in dash panel wiring harness |
| D101 | Connection -1-, in engine compartment wiring harness |
| D141 | Connection (5V), in engine prewiring wiring harness |
| * | Only models with air conditioner |
| ** | Only models with manual gearbox |
| *** | Only models with automatic gearbox |
Wiring Diagram AUDI TT 1999 - Motronic control unit - knock sensor 2 - intake air temperature sender - coolant temperature sender - throttle valve control unit
| G2 | Coolant temperature sender |
| G42 | Intake air temperature sender |
| G62 | Coolant temperature sender |
| G66 | Knock sensor 2 |
| G186 | Throttle valve drive (electric throttle operation) |
| G187 | Throttle valve drive angle sender -1- (electric throttle operation) |
| G188 | Throttle valve drive angle sender -2- (electric throttle operation) |
| J220 | Motronic control unit |
| J338 | Throttle valve control unit |
| T3b | 3-pin connector, black, in engine compartment |
| T10i | 10-pin connector, in engine compartment, left |
| 85 | Earth connection -1-, in engine compartment wiring harness |
| 132 | Earth connection -3-, in engine compartment wiring harness |
| 220 | Earth connection (sender earth), in engine wiring harness |
| 269 | Earth connection (sender earth) -1-, in dash panel wiring harness |
| D101 | Connection -1-, in engine compartment wiring harness |
| * | Changes inclusive |
Wiring Diagram AUDI TT 1999 - Motronic control unit - ignition coils
| J220 | Motronic 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 plug |
| T6m | 6-pin connector, brown, in plenum chamber |
| T10g | 10-pin connector, blue, in plenum chamber |
| T10i | 10-pin connector, in engine compartment, left |
| T10x | 10-pin connector, orange, in plenum chamber |
| 15 | Earth point, on cylinder head |
| 281 | Earth connection -1-, in engine prewiring wiring harness |
| 283 | Earth connection -2-, in engine prewiring wiring harness |
| A27 | Connection (speed signal), in dash panel wiring harness, near micro-central electrics |
| A104 | Connection -2- (15), in dash panel wiring harness |
| D23 | Connection (via fuse 229), in front right wiring harness |
| * | Only models with on-board computer |
Wiring Diagram AUDI TT 1999 - Fuses - speedometer sender - fuel gauge sender - fuel pump
| G | Fuel gauge sender |
| G6 | Fuel pump (pre-supply pump) |
| G22 | Speedometer sender (Hall sender, on gearbox) |
| S7 | Fuse in fuse box |
| S228 | Fuse in fuse box |
| S229 | Fuse in fuse box |
| S232 | Fuse in fuse box |
| S234 | Fuse in fuse box |
| S243 | Fuse in fuse box |
| T10i | 10-pin connector, in engine compartment, left |
| 269 | Earth connection (sender earth) -1-, in dash panel wiring harness |
| 277 | Earth connection -3-, in interior wiring harness, behind dash panel |
| 283 | Earth connection -2-, in engine prewiring wiring harness |
| A99 | Connection -1- (87), in dash panel wiring harness |
| A100 | Connection -2- (87), in dash panel wiring harness |
| D22 | Connection (via fuse 234), in front right wiring harness |
Wiring Diagram AUDI TT 1999 - Dash panel insert - oil pressure switch - ambient temperature sensor
| C10 | Suppression filter |
| E87 | Control and display unit for air conditioner |
| F1 | Oil pressure switch |
| G17 | Ambient temperature sensor |
| G106 | Ambient temperature indicator |
| J218 | Combi-processor in dash panel insert |
| K2 | Alternator warning lamp |
| K3 | Oil pressure warning lamp |
| T10i | 10-pin connector, in engine compartment, left |
| T12a | 12-pin connector, behind dash panel, right |
| T32 | 32-pin connector, blue, on dash panel insert |
| T32a | 32-pin connector, green, on dash panel insert |
| 131 | Earth connection -2-, in engine compartment wiring harness |
| 269 | Earth connection (sender earth) -1-, in dash panel wiring harness |
| 283 | Earth connection -2-, in engine prewiring wiring harness |
| A17 | Connection (61), in dash panel wiring harness |
| * | Models with on-board computer |
| ** | Models without air conditioner |
| *** | Models with air conditioner, see Current Flow Diagram: Air conditioner |
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