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AUDI A3 2004 – 1.6 litre fuel injection engine (Motronic), 69 kW, 4-cylinder, engine code BAH . Wiring diagrams, Pin Connector, Location

Wiring Diagram AUDI A3 2004 - Battery - starter - alternator - fuses



Wiring Diagram  AUDI A3 2004 - Battery - starter - alternator - fuses https://portal-diagnostov.com/license.html
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ABattery
BStarter
CAlternator
C1Voltage regulator
DIgnition/starter switch
J293Radiator fan control unit
S131Fuse 1
S132Fuse 2
S133Fuse 3
S134Fuse 4
S138Fuse 5
S162Fuse -1- (30), in fuse box/battery
S163Fuse -2- (30), in fuse box/battery
S164Fuse -3- (30), in fuse box/battery
T3e3-pin connector, black, on main fuse box
T4b4-pin connector, in engine compartment, left
T6m6-pin connector, brown, in plenum chamber
   2 Earth strap, gearbox - body
   12 Earth point, in engine compartment, left
*Radiator fan control (engine), see applicable Current Flow Diagram: Air conditioner

Wiring Diagram AUDI A3 2004 - Motronic control unit - injectors - fuel pump relay



Wiring Diagram  AUDI A3 2004 - Motronic control unit - injectors - fuel pump relay https://portal-diagnostov.com/license.html
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DIgnition/starter switch
J17Fuel pump relay
J220Motronic control unit
J234Airbag control unit
N30Injector, cylinder 1
N31Injector, cylinder 2
N32Injector, cylinder 3
N33Injector, cylinder 4
T6m6-pin connector, brown, in plenum chamber
T1414-pin connector, in engine compartment, left
   A125 Connection (crash signal), in dash panel wiring harness
   B155 Connection -2- (TK (door contact)), in interior wiring harness
   D140 Connection (injectors), in engine prewiring wiring harness
*If fitted

Wiring Diagram AUDI A3 2004 - Motronic control unit - coolant temperature sender - engine speed sender - Hall sender - coolant temperature sender - intake manifold pressure sender - intake air temperature sender



Wiring Diagram  AUDI A3 2004 - Motronic control unit - coolant temperature sender - engine speed sender - Hall sender - coolant temperature sender - intake manifold pressure sender - intake air temperature sender https://portal-diagnostov.com/license.html
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G2Coolant temperature sender
G28Engine speed sender
G40Hall sender
G42Intake air temperature sender
G62Coolant temperature sender
G71Intake manifold pressure sender
J220Motronic control unit
T3d3-pin connector, white, engine speed sender, in engine compartment
T1414-pin connector, in engine compartment, left
   220 Earth connection (sender earth), in engine wiring harness
   269 Earth connection (sender earth) -1-, in dash panel wiring harness
   D103 Connection -3-, in engine compartment wiring harness

Wiring Diagram AUDI A3 2004 - Motronic control unit - throttle valve unit



Wiring Diagram  AUDI A3 2004 - Motronic control unit - throttle valve unit https://portal-diagnostov.com/license.html
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G186Throttle valve drive (electric power control)
G187Throttle valve drive angle sender -1- (electric power control)
G188Throttle valve drive angle sender -2- (electric power control)
J220Motronic control unit
J338Throttle valve module
T1010-pin connector, white, in plenum chamber
T10x10-pin connector, orange, in plenum chamber
   10 Earth point, in plenum chamber
   85 Earth connection -1-, in engine compartment wiring harness
   A45 Connection (engine speed signal), in dash panel wiring harness
   A108 Connection (speed signal), in dash panel wiring harness

Wiring Diagram AUDI A3 2004 - Motronic control unit - accelerator pedal position senders - clutch pedal switch - brake light switch



Wiring Diagram  AUDI A3 2004 - Motronic control unit - accelerator pedal position senders - clutch pedal switch - brake light switch https://portal-diagnostov.com/license.html
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FBrake light switch
F36Clutch pedal switch
G79Accelerator pedal position sender
G185Accelerator pedal position sender -2-
J220Motronic control unit
T1010-pin connector, white, in plenum chamber
T10e10-pin connector, black, in plenum chamber
T10g10-pin connector, blue, in plenum chamber
   B135 Connection -1- (15a), in interior wiring harness
   B185 Connection -2- (54), in interior wiring harness
*Only applies to models with manual gearbox

Wiring Diagram AUDI A3 2004 - Motronic control unit - knock sensor I - lambda probe - lambda probe heater - activated charcoal filter system solenoid valve 1



Wiring Diagram  AUDI A3 2004 - Motronic control unit - knock sensor I - lambda probe - lambda probe heater - activated charcoal filter system solenoid valve 1 https://portal-diagnostov.com/license.html
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G39Lambda probe
G61Knock sensor I
J220Motronic control unit
N80Activated charcoal filter system solenoid valve 1 (pulsed)
T2ap2-pin connector, knock sensor I
T4m4-pin connector, lambda probe, in engine compartment, right
T6m6-pin connector, brown, engine compartment, in plenum chamber
T10x10-pin connector, orange, engine compartment, in plenum chamber
Z19Lambda probe heater
   D80 Positive (+) connection (87a - for activated charcoal filter system solenoid valve), in engine compartment wiring harness
   D102 Connection -2-, in engine compartment wiring harness

Wiring Diagram AUDI A3 2004 - Motronic control unit - control and display unit for air conditioner/Climatronic



Wiring Diagram  AUDI A3 2004 - Motronic control unit - control and display unit for air conditioner/Climatronic https://portal-diagnostov.com/license.html
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DIgnition/starter switch
E87Control and display unit for air conditioner/Climatronic
J17Fuel pump relay
J217Automatic gearbox control unit
J220Motronic control unit
J226Starter inhibitor and reversing light relay
J293Radiator fan control unit
T1010-pin connector, white, in plenum chamber
T10x10-pin connector, orange, engine compartment, in plenum chamber
T14a14-pin connector, air conditioner control unit (radiator fan)
   A121 Connection (high bus), in dash panel wiring harness
   A122 Connection (low bus), in dash panel wiring harness
   B209 Connection (Climatronic sender), in interior wiring harness
   B239 Positive (+) connection -1- (50), in interior wiring harness
*Only models with automatic gearbox
**Only applies to models with air conditioner
***Radiator fan control (engine), see applicable Current Flow Diagram: Air conditioner

Wiring Diagram AUDI A3 2004 - Motronic control unit - ignition coils - final output stage



Wiring Diagram  AUDI A3 2004 - Motronic control unit - ignition coils - final output stage https://portal-diagnostov.com/license.html
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J220Motronic control unit
NIgnition coil
N122Final output stage
N128Ignition coil 2
PSpark plug connector
QSpark plugs
S237Fuse in fuse box
T6m6-pin connector, brown, in plenum chamber
T1414-pin connector, in engine compartment, left
   10 Earth point, in plenum chamber
   281 Earth connection -1-, in engine wiring harness
   A15 Positive (+) connection (15), in dash panel wiring harness
   A98 Positive (+) connection -4- (30), in dash panel wiring harness
   B156 Positive (+) connection (30a), in interior wiring harness
   D78 Positive (+) connection -1- (30a), in engine compartment wiring harness

Wiring Diagram AUDI A3 2004 - Fuses



Wiring Diagram  AUDI A3 2004 - Fuses https://portal-diagnostov.com/license.html
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DIgnition/starter switch
S5Fuse in fuse box/relay plate
S7Fuse in fuse box/relay plate
S11Fuse in fuse box/relay plate
S13Fuse in fuse box/relay plate
S229Fuse in fuse box
   30 Earth point -1-, next to relay plate
   277 Earth connection -3-, in interior wiring harness
   A2 Positive (+) connection (15), in dash panel wiring harness
   A23 Connection (30al), in dash panel wiring harness
   B149 Positive (+) connection -2- (15a), in interior wiring harness

Wiring Diagram AUDI A3 2004 - Fuses - fuel gauge sender - fuel pump



Wiring Diagram  AUDI A3 2004 - Fuses - fuel gauge sender - fuel pump https://portal-diagnostov.com/license.html
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GFuel gauge sender
G6Fuel pump (pre-supply pump)
J218Combi-processor in dash panel insert
K2Alternator warning lamp
S228Fuse in fuse box
S232Fuse in fuse box
S243Fuse in fuse box
T1616-pin connector, black, centre console compartment (diagnostic connector)
T3232-pin connector, blue, on dash panel insert
T32a32-pin connector, green, on dash panel insert
   269 Earth connection (sender earth) -1-, in dash panel wiring harness
   277 Earth connection -3-, in interior wiring harness
   A76 Connection (diagnosis wire K), in dash panel wiring harness
   A99 Connection -1- (87), in dash panel wiring harness
   A101 Connection -3- (87), in dash panel wiring harness
   B147 Positive (+) connection -2- (87), in interior wiring harness
*If fitted

Wiring Diagram AUDI A3 2004 - Dash panel insert - oil pressure switch - speedometer sender (Hall sender - on gearbox) - oil level/oil temperature sender



Wiring Diagram  AUDI A3 2004 - Dash panel insert - oil pressure switch - speedometer sender (Hall sender - on gearbox) - oil level/oil temperature sender https://portal-diagnostov.com/license.html
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F1Oil pressure switch
G22Speedometer sender (Hall sender, on gearbox)
G266Oil level/oil temperature sender
J218Combi-processor in dash panel insert
J533Data bus diagnostic interface
K132Electronic power control fault lamp
K149Engine electronics warning lamp
T1414-pin connector, in engine compartment, left
T3232-pin connector, blue, on dash panel insert
T32a32-pin connector, green, on dash panel insert
   269 Earth connection (sender earth) -1-, in dash panel wiring harness
   281 Earth connection -1-, in engine prewiring wiring harness
   A80 Connection -1- (X), in dash panel wiring harness
   B178 Connection (speed signal), in interior wiring harness