SEAT LEON 2003 – Air conditioning system . Wiring diagrams, Pin Connector, Location

Wiring Diagram SEAT LEON 2003 - Fresh air blower switch - fresh air and air recirculation flap switch - fresh air and air recirculation warning lamp - fresh air regulator illumination bulb

D	Ignition/starter switch
E9	Fresh air blower switch
E159	Fresh air/air recirculation flap switch
J285	Control unit with display in dash panel insert
K114	Fresh air and air recirculation warning lamp
L16	Fresh air regulator illumination bulb
N24	Fresh air blower series resistor with overheating fuse
V2	Fresh air blower
V154	Fresh air/recirculated air flap control motor
T10x	10-pin connector, on air conditioning system
162	Earth connection, in blower motor wiring harness
503	Screw connection 2 (75x), on relay plate
A2	Positive connection (15), in dash panel wiring harness
A11	Positive connection (58b), in dash panel wiring harness
A20	Connection (15a), in dash panel wiring harness
L66	Connection, in heater blower wiring harness

Wiring Diagram SEAT LEON 2003 - Radiator fan control unit - air conditioning system switch - air conditioning system warning lamp

E35	Air conditioning system switch
J...	Engine control units
J248	Diesel direct injection system control unit
J293	Radiator fan control unit
K84	Air conditioning system warning lamp
V51	Continued coolant circulation pump
T10	10-pin connector, orange, in connector protective housing, on left in plenum chamber
T10d	10-pin connector, green, in connector protective housing, on left in plenum chamber
T10x	10-pin connector, on air conditioning system
T14a	14-pin connector, in left wiring harness
85	Earth connection 1, in engine compartment wiring harness
176	Earth connection, in right headlight wiring harness
L9	Connection 1, in air conditioning system wiring harness
L45	Connection, in air conditioning system operating unit wiring harness
*	only models with engine code AMK
**	only models with engine codes AUE, BDE and AQN

Wiring Diagram SEAT LEON 2003 - Radiator fan control unit - temperature sender for compressor switch-off - air conditioning system magnetic clutch - radiator fan

D	Ignition/starter switch
G346	Temperature sender for compressor switch-off
J285	Control unit with display in dash panel insert
J293	Radiator fan control unit
N25	Air conditioning system magnetic coupling
V7	Radiator fan
V35	Right fan for radiator
T3b	3-pin connector, on radiator fan
T3c	3-pin connector, on radiator fan
T4l	4-pin connector, on engine
T4m	4-pin connector, in left engine compartment
193	Earth connection 1, in coolant fan wiring harness
501	Screw connection 2 (30), on relay plate
A32	Positive connection (30), in dash panel wiring harness
C11	Connection in radiator fan wiring harness
K21	Connection 1, in radiator fan wiring harness

Wiring Diagram SEAT LEON 2003 - Radiator fan control unit - radiator fan thermal switch - high pressure sender

A	Battery
F18	Radiator fan thermal switch
G65	High pressure sender
J...	Engine control units
J293	Radiator fan control unit
S164	Fuse 3 (30) in fuse holder on battery
S180	Fuse 8 (30) in fuse holder on battery
T3	3-pin connector, on the battery
T4m	4-pin connector, in left engine compartment
T10	10-pin connector, orange, in connector protective housing, on left in plenum chamber
193	Earth connection 1, in coolant fan wiring harness
D61	Connection (air conditioning system), in engine compartment wiring harness
K20	Positive connection 1 (30), in radiator fan wiring harness
K21	Connection 1, in radiator fan wiring harness

SEAT LEON 2003 Overview of earth points in engine compartment

Overview of earth points in engine compartment    

608	Earth point, in centre of plenum chamber ⇒ -arrow-

 

10 Earth point, in plenum chamber ⇒ -arrow-

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609	Earth point, on right in plenum chamber ⇒ -arrow-

 

1 Earth strap, battery - body ⇒ Arrow A

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12	Earth points, on left in engine compartment ⇒ -arrow B-

 

2 Earth strap, gearbox - body ⇒ -arrow-

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Overview of earth points in vehicle interior

Toledo/León	Fitting Locations	No.  801 / 6

43	Earth point, lower part of right A-pillar ⇒ -arrow-

 

78 Earth point on right B-pillar ⇒ -arrow-

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77	Earth point on left B-pillar ⇒ -arrow-

 

44 Earth point, lower part of left A-pillar ⇒ -arrow-

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33	Earth point behind dash panel on right ⇒ -arrow-

42	Same earth point as ⇒ -arrow-

 

32	Earth point behind dash panel on left ⇒ -arrow-

 

45 Earth point, behind dash panel

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SEAT LEON 2003 Overview of earth points in luggage compartment (Toledo)

Overview of earth points in luggage compartment (Toledo)

50	Earth point, on left in luggage compartment

  Overview of earth points in luggage compartment (León)

57	Earth point, left rear pillar

 

SEAT LEON 2003 Overview of coupling station and connections for wiring harness

Overview of coupling station and connections for wiring harness    

1 -	Coupling station in protective housing, in plenum chamber

q	With connectors -T10g-, -T10d-, -T10e-, -T10-, -T6l-, -T10h-,

2 -	Coupling station, right B-pillar

q	With connector

3 -	Coupling station on left of C-pillar

q

Location

4 -	Coupling station on left of A-pillar

q	With connector

5 -	Coupling station in engine compartment, in left wiring harness

q

Location

Coupling station in protective housing, in plenum chamber

1 -	10-pin connector -T10g-, grey, automatic gearbox

2 -	10-pin connector, -T10d-, white, data bus wire, engine control unit, automatic gearbox, Motronic control unit, ABS control unit

3 -	10-pin connector -T10e-, black, cruise control system, Motronic control unit, engine control unit

4 -	10-pin connector -T10-, orange, reversing lights, engine control unit, starter, Climatronic control unit, Motronic control unit

5 -	6-pin connector -T6l-, brown, starter, fuel pump relay, engine control unit

Toledo/León	Fitting Locations	No.  803 / 3

6 -	10-pin connector -T10h-, blue, accelerator position sender, Motronic control unit, engine control unit

7 -	10-pin connector, -T10v-, green, radiator outlet coolant temperature sender, radiator fan control unit, potentiometer for temperature selection rotary knob

SEAT LEON 2003 Coupling station, right B-pillar

Coupling station, right B-pillar

1 -	10-pin connector -T10m-, black, signal loudspeakers, central locking, rear electric window regulator, rear door warning lamp

The wiring on the B-pillar, left, is installed vice versa.

 

SEAT LEON 2003 Coupling station on left of C-pillar Coupling station on left of C-pillar See connectors in fitting locations: Multi-pin connections. 1 -  Earth connection 2 -  Rear fog light, number plate light, reversing lights black 3 -  Rear window wiper and washer system (only for Leon) pink 4 -  Central locking brown

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SEAT LEON 2003 Coupling station on left of A-pillar

Coupling station on left of A-pillar

1 -	10-pin connector -T10i-, black, central locking, electric mirror adjustment, radio with muting / electric windows

The wiring on the A-pillar, right, is installed vice versa.

 

SEAT LEON 2003 Coupling station in engine compartment, in left wiring harness Coupling station in engine compartment, in left wiring harness See connectors in fitting locations: Multi-pin connections.

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SEAT LEON 2003 Overview of fuses

Overview of fuses    

1 -

q	Position of fuses

2 -

3 -	Fuse on fuse holder -S162-, -S163-, -S164-, -S176-, -S177-, -S178-, -S179-, -S180-, next to battery

q	Location, up to August 2000:

q	Location, from September 2000:

Fuse in fuse holder, dash panel

Fuse colours

30 A -

green

25 A -

white

20 A -

yellow

15 A -

blue

10 A -

red

7,5 A -

brown

5 A -

beige

3 A -

purple

The fuse electrical connections are shown in the respective current flow diagrams. The fuses for options not mentioned are also shown in the respective Current flow diagrams.

Fuses from S 24 are designated with an additional characteristic o. distinctive feature "2" in the Current Flow Diagram, for example: S 40 is designated as S 240.

 

SEAT LEON 2003 Position of fuses in fuse holder, left dash panel

Position of fuses in fuse holder, left dash panel

No.		Current Flow Diagram designation	Nominal value		Function/component	Terminal
1	-	-S1-	10A	-	Glove compartment light, heated washer jets
2	-	-S2-	10A	-	Turn signals
3	-	-S3-	5A	-	Side light warning lamp
4	-	-S4-	5A	-	Number plate light
5	-	-S5-	7.5A	-	Number plate light
6	-	-S6-	5A	-	Electric folding exterior mirror and window regulator (applicable up to October 2001) Convenience system central control unit (applicable from November 2001)
7	-	-S7-	10A	-	Reversing light
8	-	-S8-	5A	-	Telephone
9	-	-S9-	5A	-	ABS/ESP/HALDEX
10	-	-S10-	10A	-	Petrol engine control unit (applicable up to October 2001) Diesel engine control unit (applicable up to October 2001) - S-contact (applicable from November 2001)
11	-	-S11-	5A	-	Dash panel insert
12	-	-S12-	7.5A	-	Diagnosis voltage
13	-	-S13-	10A	-	Brake lights
14	-	-S14-	10A	-	Interior light
15	-	-S15-	5A	-	Dash panel insert, steering angle sender
16	-	-S16-	10A	-	Compressor

SEAT LEON 2003 Position of fuses in fuse holder, left dash panel

Toledo/León	Fitting Locations	No.  802 / 5

Toledo/León Fitting Locations No.  802 / 6 Toledo/León Fitting Locations No.  802 / 7 Auxiliary fuse above additional relay carrier Right-handdrive vehicles A -  Seat adjustment fuse -S45- (30 A) B -  Vacuum pump fuse (20 A) C -  Window regulator fuse -S37- (30 A) D -  Fuel charging hole fuse -S323- (10 A) E -  Alarm horn fuse -S111- (15 A)  -  Turn signal fuse -S144- (15 A) F -  Taxi fuse (15 A) G -  Vacant H -  Vacant   https://portal-diagnostov.com/license.html https://portal-diagnostov.com/license.html Automotive Electricians Portal FZCO Automotive Electricians Portal FZCO Get access to all wiring diagrams of the car Left-handdrive vehicles: A -  Seat adjustment fuse -S45- (30 A) B -  Vacuum pump fuse (20 A) C -  Window regulator fuse -S37- (30 A) D -  Vacant E -  Taxi fuse (15 A) F -  Alarm horn fuse 1 -S111- (15 A)  -  Turn signal fuse -S144- (15 A) G -  Fuel charging hole fuse -S323- (10 A) H -  Vacant   https://portal-diagnostov.com/license.html https://portal-diagnostov.com/license.html Automotive Electricians Portal FZCO Automotive Electricians Portal FZCO Get access to all wiring diagrams of the car SEAT LEON 2003 Fuse on fuse holder, next to battery (up to August 2000): Fuse on fuse holder, next to battery (up to August 2000): Fuses: S162 -  Glow plug heater 50 A S163 -  Engine control unit 50 A S164 -  Radiator fan 40 A S176 -  Passenger compartment, 110A S177 -  Alternator (90 A), 110 A  -  Alternator (120 A), 150 A S178 -  ABS (pump), 30 A S179 -  ABS, 30 A S180 -  Radiator fan 30 A

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SEAT LEON 2003 Fuse on fuse holder, next to battery (from September 2000):

Fuse on fuse holder, next to battery (from September 2000):

A -	Red wire, 16mm²

   

Fuses: S162 -  Glow plug heater 50 A S163 -  Engine control unit 50 A S164 -  Radiator fan 40 A S176 -  Passenger compartment, 110A S177 -  Alternator (90 A), 110 A  -  Alternator (120 A), 150 A S178 -  ABS (pump), 30 A S179 -  ABS, 30 A S180 -  Radiator fan 30 A

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