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

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

Battery

Starter

Alternator

Voltage regulator

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

Earth strap, gearbox - body

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

Ignition/starter switch

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

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

Earth point, in plenum chamber

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

Connection, in Simos wiring harness

Audi A3	Current Flow Diagram	No. 2 / 5

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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, 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

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

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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, accelerator pedal position senders, cruise control system switch, clutch pedal switch, brake light switch

E45

Cruise control system switch

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

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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, 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

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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, 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

Ignition coil

N122

Final output stage

N128

Ignition coil 2

Spark plug connector

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

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

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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, brake servo control unit, automatic gearbox control unit, control and display unit for air conditioner/Climatronic

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

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

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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, 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)

Radiator fan

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

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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

Fuses, fuel gauge sender, fuel pump

Ignition/starter switch

Fuel gauge sender

Fuel pump (pre-supply pump)

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

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

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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

Dash panel insert, oil pressure switch, speedometer sender (Hall sender, on gearbox), oil level/oil temperature sender

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

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

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

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