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Wiring diagrams AUDI 1.6 litre fuel injection engine (Simos), 75 kW, 4-cylinder, engine code BFQ

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Wiring diagrams AUDI 1.6 litre fuel injection engine (Simos), 75 kW, 4-cylinder, engine code BFQ From model year 2003
Audi A3 Current Flow Diagram No.  2 / 1
Edition 05.2003
Main fuse box/battery
Wiring diagrams AUDI 1.6 litre fuel injection engine (Simos), 75 kW, 4-cylinder, engine code BFQ
t  On battery, in engine compartment, front left
Position of fuses
S131 -  Fuse 1
S132 -  Fuse 2
S133 -  Fuse 3
S134 -  Fuse 4
S138 -  Fuse 5
S162 -  Fuse -1- (30), in fuse box/battery
S163 -  Fuse -2- (30), in fuse box/battery
S164 -  Fuse -3- (30), in fuse box/battery
Fuse box
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t  Dash panel, driver's side
Fuse colours
30 A -  green
25 A -  white
20 A -  yellow
15 A -  blue
10 A -  red
7.5 A -  brown
5 A -  beige
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  Note:
From fuse number 23 upwards the fuses in the fuse box are designated as 223 etc. in the Current Flow Diagram.
Micro-central electrics
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t  Under driver's storage compartment
4 -  Fuel pump relay (J17)
B -  Brake vacuum pump fuse (S283)
13-point relay carrier
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t  Above micro-central electrics, under driver's storage compartment
11 -  Starter inhibitor and reversing light relay (J226)
3-point relay carrier/fuse box
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t  In engine compartment, front left, in plenum chamber, near brake master cylinder
1 -  Secondary air pump relay (J299)
2 -  Current supply relay for Simos control unit (J363)

Audi A3 Current Flow Diagram No.  2 / 2
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ws = white
sw = black
ro = red
rt = red
br = brown
gn = green
bl = blue
gr = grey
li = purple
vi = purple
ge = yellow
or = orange
rs = pink
 
 
 
 
 
Battery, starter, alternator, fuses
A -   Battery
B -   Starter
C -   Alternator
C1 -   Voltage regulator
D -   Ignition/starter switch
S131 -   Fuse 1
S132 -   Fuse 2
S133 -   Fuse 3
S134 -   Fuse 4
S138 -   Fuse 5
S162 -   Fuse -1- (30), in fuse box/battery
S163 -   Fuse -2- (30), in fuse box/battery
S164 -   Fuse -3- (30), in fuse box/battery
T2f -   2-pin connector, alternator, in engine compartment, left
T3e -   3-pin connector, black, on main fuse box
T4b -   4-pin connector, in engine compartment, left
T6m -   6-pin connector, brown, in plenum chamber
  2 -   Earth strap, gearbox - body
  12 -   Earth point, in engine compartment, left
  D97 -   Connection (50), in engine compartment wiring harness, right
* -   Models with air conditioner
** -   Models without air conditioner

Audi A3 Current Flow Diagram No.  2 / 3
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ws = white
sw = black
ro = red
rt = red
br = brown
gn = green
bl = blue
gr = grey
li = purple
vi = purple
ge = yellow
or = orange
rs = pink
 
 
 
 
 
Injectors, intake manifold change-over valve, fuel pump relay, coolant temperature senders
D -   Ignition/starter switch
G2 -   Coolant temperature sender
G62 -   Coolant temperature sender
J17 -   Fuel pump relay
J234 -   Airbag control unit
J361 -   Simos control unit
N30 -   Injector, cylinder 1
N31 -   Injector, cylinder 2
N32 -   Injector, cylinder 3
N33 -   Injector, cylinder 4
N79 -   Heater element (crankcase breather)
N156 -   Intake manifold change-over valve
T6m -   6-pin connector, brown, in plenum chamber
T10 -   10-pin connector, white, in plenum chamber
T14 -   14-pin connector, in engine compartment, left
  85 -   Earth connection -1-, in engine compartment wiring harness
  269 -   Earth connection (sender earth) -1-, in dash panel wiring harness
  A100 -   Connection -2- (87), in dash panel wiring harness
  A125 -   Connection (crash signal), in dash panel wiring harness
  B155 -   Connection -2- (TK (door contact)), in interior wiring harness
  D140 -   Connection (injectors), in engine wiring harness
* -   Only applies to models with heater element (crankcase breather)

Audi A3 Current Flow Diagram No.  2 / 4
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ws = white
sw = black
ro = red
rt = red
br = brown
gn = green
bl = blue
gr = grey
li = purple
vi = purple
ge = yellow
or = orange
rs = pink
 
 
 
 
 
Simos control unit, current supply relay for Simos control unit, secondary air pump relay, map-controlled engine cooling thermostat, exhaust gas recirculation valve
F265 -   Map-controlled engine cooling thermostat
G212 -   Exhaust gas recirculation potentiometer
J299 -   Secondary air pump relay
J361 -   Simos control unit
J363 -   Current supply relay for Simos control unit
N18 -   Exhaust gas recirculation valve
T2m -   2-pin connector, engine prewiring, wiring duct, in engine compartment, left
T6m -   6-pin connector, brown, in plenum chamber
V101 -   Secondary air pump motor
  10 -   Earth point, in plenum chamber
  85 -   Earth connection -1-, in engine compartment wiring harness
  D52 -   Positive (+) connection (15a), in engine compartment wiring harness
  D74 -   Connection (86), in engine compartment wiring harness
  G9 -   Connection, in Simos wiring harness

Audi A3 Current Flow Diagram No.  2 / 5
Unlock Lifetime Access for This Car.
ws = white
sw = black
ro = red
rt = red
br = brown
gn = green
bl = blue
gr = grey
li = purple
vi = purple
ge = yellow
or = orange
rs = pink
 
 
 
 
 
Simos control unit, throttle valve control unit, exhaust gas recirculation valve
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)
J338 -   Throttle valve control unit
J361 -   Simos control unit
T10 -   10-pin connector, white, in plenum chamber
T10x -   10-pin connector, orange, 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

Audi A3 Current Flow Diagram No.  2 / 6
Unlock Lifetime Access for This Car.
ws = white
sw = black
ro = red
rt = red
br = brown
gn = green
bl = blue
gr = grey
li = purple
vi = purple
ge = yellow
or = orange
rs = pink
 
 
 
 
 
Simos control unit, accelerator pedal position senders, cruise control system switch, clutch pedal switch, brake light switch
E45 -   Cruise control system switch
F -   Brake light switch
F36 -   Clutch pedal switch
G79 -   Accelerator pedal position sender
G185 -   Accelerator pedal position sender -2-
J361 -   Simos control unit
T10 -   10-pin connector, white, in plenum chamber
T10e -   10-pin connector, black, in plenum chamber
T10g -   10-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 cruise control system
** -   Only applies to models with manual gearbox

Audi A3 Current Flow Diagram No.  2 / 7
Unlock Lifetime Access for This Car.
ws = white
sw = black
ro = red
rt = red
br = brown
gn = green
bl = blue
gr = grey
li = purple
vi = purple
ge = yellow
or = orange
rs = pink
 
 
 
 
 
Simos control unit, lambda probes
G39 -   Lambda probe
G70 -   Air mass meter
G130 -   Lambda probe downstream of catalytic converter
J361 -   Simos control unit
N80 -   Activated charcoal filter system solenoid valve 1 (pulsed)
T4m -   4-pin connector, lambda probe, in engine compartment, right
T6m -   6-pin connector, brown, engine compartment, in plenum chamber
T6o -   6-pin connector, lambda probe, in engine compartment, right
T10x -   10-pin connector, orange, engine compartment, in plenum chamber
Z19 -   Lambda probe heater
Z29 -   Lambda probe 1 heater, downstream of catalytic converter
  D80 -   Positive (+) connection (87a - for activated charcoal filter system solenoid valve), in engine compartment wiring harness

Audi A3 Current Flow Diagram No.  2 / 8
Unlock Lifetime Access for This Car.
ws = white
sw = black
ro = red
rt = red
br = brown
gn = green
bl = blue
gr = grey
li = purple
vi = purple
ge = yellow
or = orange
rs = pink
 
 
 
 
 
Simos control unit, Hall sender, engine speed sender, knock sensor I, ignition coils
F88 -   Power assisted steering pressure switch
G40 -   Hall sender
G28 -   Engine speed sender
G61 -   Knock sensor I
J361 -   Simos control unit
N -   Ignition coil
N122 -   Final output stage
N128 -   Ignition coil 2
P -   Spark plug connector
Q -   Spark plugs
T3b -   3-pin connector, blue, knock sensor I, in engine compartment
T3d -   3-pin connector, white, engine speed sender, in engine compartment
T14 -   14-pin connector, in engine compartment, left
  10 -   Earth point, in plenum chamber
  281 -   Earth connection -1-, in engine prewiring wiring harness
  A15 -   Positive (+) connection (15), in dash panel wiring harness

Audi A3 Current Flow Diagram No.  2 / 9
Unlock Lifetime Access for This Car.
ws = white
sw = black
ro = red
rt = red
br = brown
gn = green
bl = blue
gr = grey
li = purple
vi = purple
ge = yellow
or = orange
rs = pink
 
 
 
 
 
Simos control unit, brake servo control unit, automatic gearbox control unit, control and display unit for air conditioner/Climatronic
D -   Ignition/starter switch
E87 -   Control and display unit for air conditioner/Climatronic
J17 -   Fuel pump relay
J217 -   Automatic gearbox control unit
J226 -   Starter inhibitor and reversing light relay
J361 -   Simos control unit
J542 -   Brake servo control unit
T10 -   10-pin connector, white, in plenum chamber
T10x -   10-pin connector, orange, engine compartment, in plenum chamber
V192 -   Vacuum pump for brakes
  30 -   Earth point -1-, next to relay plate
  249 -   Earth connection -2-, in interior wiring harness
  277 -   Earth connection -3-, in interior wiring harness
  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
*** -   Only models with manual gearbox

Audi A3 Current Flow Diagram No.  2 / 10
Unlock Lifetime Access for This Car.
ws = white
sw = black
ro = red
rt = red
br = brown
gn = green
bl = blue
gr = grey
li = purple
vi = purple
ge = yellow
or = orange
rs = pink
 
 
 
 
 
Simos control unit, coolant temperature sender, radiator fan control unit
F269 -   Temperature flap position switch
G83 -   Coolant temperature sender - radiator outlet
G267 -   Temperature selection rotary knob potentiometer
J293 -   Radiator fan control unit
J361 -   Simos control unit
S16 -   Fuse in fuse box/relay plate
S237 -   Fuse in fuse box
S283 -   Brake vacuum pump fuse
T4p -   4-pin connector, on radiator fan control unit
T6q -   6-pin connector, on radiator fan control unit
T10a -   10-pin connector, green, in plenum chamber
T14a -   14-pin connector, air conditioner control unit (radiator fan)
V7 -   Radiator fan
  11 -   Earth point, in battery box
  A98 -   Positive (+) connection -4- (30), in dash panel wiring harness
  B156 -   Positive (+) connection (30a), in interior wiring harness
* -   Only models with automatic gearbox
** -   Only applies to models with air conditioner
*** -   Only applies to models without air conditioner

Audi A3 Current Flow Diagram No.  2 / 11
Unlock Lifetime Access for This Car.
ws = white
sw = black
ro = red
rt = red
br = brown
gn = green
bl = blue
gr = grey
li = purple
vi = purple
ge = yellow
or = orange
rs = pink
 
 
 
 
 
Fuses, fuel gauge sender, fuel pump
D -   Ignition/starter switch
G -   Fuel gauge sender
G6 -   Fuel pump (pre-supply pump)
S5 -   Fuse in fuse box/relay plate
S7 -   Fuse in fuse box/relay plate
S11 -   Fuse in fuse box/relay plate
S13 -   Fuse in fuse box/relay plate
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
  269 -   Earth connection (sender earth) -1-, in dash panel wiring harness
  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
  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
  B149 -   Positive (+) connection -2- (15a), in interior wiring harness

Audi A3 Current Flow Diagram No.  2 / 12
Unlock Lifetime Access for This Car.
ws = white
sw = black
ro = red
rt = red
br = brown
gn = green
bl = blue
gr = grey
li = purple
vi = purple
ge = yellow
or = orange
rs = pink
 
 
 
 
 
Dash panel insert, oil pressure switch, speedometer sender (Hall sender, on gearbox), oil level/oil temperature sender
F1 -   Oil pressure switch
G22 -   Speedometer sender (Hall sender, on gearbox)
G266 -   Oil level/oil temperature sender
J218 -   Combi-processor in dash panel insert
J533 -   Data bus diagnostic interface
K2 -   Alternator warning lamp
K132 -   Electronic power control fault lamp
K149 -   Engine electronics warning lamp
T10 -   10-pin connector, white, in plenum chamber
T10x -   10-pin connector, orange, in plenum chamber
T14 -   14-pin connector, in engine compartment, left
T16 -   16-pin connector, black, centre console compartment (diagnostic connector)
T32 -   32-pin connector, blue, on dash panel insert
T32a -   32-pin connector, green, on dash panel insert
  269 -   Earth connection (sender earth) -1-, in dash panel wiring harness
  281 -   Earth connection -1-, in engine wiring harness
  A76 -   Connection (diagnosis wire K), in dash panel wiring harness
  A80 -   Connection -1- (X), in dash panel wiring harness
  B178 -   Connection (speed signal), in interior wiring harness
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