SEAT LEON 2005 – Anti-locking brake system (ABS), Anti-lock brake system (ABS) with electronic differential lock (EDL) and brake wear indicator, only models with Syncro-drive, (MARK 20) . Wiring diagrams, Pin Connector, Location

Wiring Diagram SEAT LEON 2005 - ABS with EDL control unit - brake light switch - brake pedal switch

A	Battery
F	Brake light switch
F63	Brake pedal switch
J...	Engine control units
J104	ABS with EDL control unit
J217	Automatic gearbox control unit
J317	Terminal 30 voltage supply relay
S5	Fuse in fuse box/relay plate
S13	Fuse in fuse box/relay plate
S178	Fuse -6- (30), in fuse box/battery
S179	Fuse -7- (30), in fuse box/battery
S243	Fuse in fuse box
T10d	10-pin connector, green, in protective housing for connectors, on left in plenum chamber
501	Screw connection -2- (30), on relay plate
A20	Connection (15a), in dash panel wiring harness
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
W1	Positive (+) connection -1- (54), in rear wiring harness
*	Only models with diesel engine
**	Only models with automatic gearbox

Wiring Diagram SEAT LEON 2005 - ABS with EDL control unit - differential lock valve 1 - differential lock valve 2 - ABS inlet valve - rear right - ABS inlet valve - rear left

D	Ignition/starter switch
J104	ABS with EDL control unit
N125	Differential lock valve 1
N126	Differential lock valve 2
N133	ABS inlet valve, rear right
N134	ABS inlet valve, rear left
N135	ABS outlet valve, rear right
N136	ABS outlet valve, rear left
S9	Fuse in fuse box/relay plate
V64	Hydraulic pump
T2	2-pin connector
T16	16-pin connector, self-diagnosis
A2	Positive (+) connection (15), in dash panel wiring harness
A76	Connection (diagnosis wire K), in dash panel wiring harness
*	Only models with EDL

Wiring Diagram SEAT LEON 2005 - ABS with EDL control unit - longitudinal acceleration sender - ABS inlet valve - front right - ABS outlet valve - front right

G251	Longitudinal acceleration sender
J104	ABS with EDL control unit
J503	Control unit with display for radio and navigation
N99	ABS inlet valve, front right
N100	ABS outlet valve, front right
N101	ABS inlet valve, front left
N102	ABS outlet valve, front left
A132	Connection (TCS/ESP), in dash panel wiring harness
A133	Connection (ABS impulses, left), in dash panel wiring harness
A134	Connection (ABS impulse right), in dash panel wiring harness
**	Only models with radio navigation system (MFD) with colour display

Wiring Diagram SEAT LEON 2005 - Control unit for ABS with EDS - rear right wheel revolution sensor - front right wheel revolution sensor

G44	Rear right wheel revolution sensor
G45	Front right wheel revolution sensor
G46	Rear right wheel revolution sensor
G47	Front left wheel revolution sensor
J104	Control unit for ABS with EDS
T2d	2-way connector, ABS sensor, front left
T2e	2-way connector, ABS sensor, front right
T2f	2-way connector, ABS sensor, rear left
T2g	2-way connector, ABS sensor, rear right
T25	25-way connector
D146	Connection (rev. sensor, rear, left, +), engine bay wiring haness
D147	Connection (rev. sensor, rear, left, -), engine bay wiring harness
D148	Connection (rev. sensor, rear, right, +), engine bay wiring harness
D149	Connection (rev. sensor, rear, right, -), engine bay wiring harness
*	Only vehicles with brake pad wear

Wiring Diagram SEAT LEON 2005 - Control unit for ABS with EDS - control unit with warning lamps on the instrument panel - brake lining/pad wear sender - front left

G34	Brake lining/pad wear sender, front left
J104	Control unit for ABS with EDS
J285	Control unit with warning lamps on instrument panel
K32	Brake pad/lining warning lamp
K47	ABS warning lamp
T25	25-way connector
T32	32-way connector, blue, instrument panel
T32a	32-way connector, green, instrument panel
81	Earth connection -1-, instrument panel wiring harness
135	Earth connection -2-, instrument panel wiring harness
D53	Connection (brake pad wear indicator, right) engine bay wiring harness
D54	Connection (brake pad wear indicator, right) engine bay wiring harness
*	Only vehicles with brake pad wear

SEAT LEON 2005 Overview of relay

Overview of relay    

1 -

2 -	Relay on relay plate

q	Position of relays

2 -

Relay in left engine compartment:

A -	Secondary air pump relay -J299- (100)

-	High heat output relay -J360- (100) (only models with auxiliary heater)

B -	Terminal 30 voltage supply relay -J689- (428)

-	Current supply relay for Simos control unit -J363- (429) (for models with engine code BFQ only)

-	Low heat output relay -J359- (53) (only models with auxiliary heater)

C -

Vacant

 

SEAT LEON 2005 Relay on relay plate

Relay on relay plate

1 -	Dual tone horn relay -J4- (53)

2 -	X-contact relief relay -J59- (100)

3 -

Vacant

4 -	Fuel pump relay -J17- (409)

-	Glow plug relay -J52- (103)

V y Vl -

Automatic intermittent wash and wipe relay -J31-

-	with rain sensor, with/without headlight washer system (192)

-	without rain sensor, with headlight washer system (389)

-	without rain sensor, without headlight washer system (377)

 

SEAT LEON 2005 Relay on the 13 position additional relay carrier above the relay plate

Relay on the 13 position additional relay carrier above the relay plate

Left-handdrive vehicles:

1 -	Telephone relay

2....9 -

Vacant

10 -	Fuel pump relay (turbo diesel engine unit injectors) (167) -J17- (up to October 2002)

-	Fuel pump relay (TDI-PD) (53) (from November 2002)

11 -	Automatic gearbox relay AG4 -J60- (175)

12 -	Terminal 30 voltage supply relay -J317- (109)

13 -	Radiator fan relay (53)

 

Right-handdrive vehicles: 1....5 -  Vacant 6 -  Telephone switch-over relay 7 -  Radiator fan relay -J26- (53) 8 -  Terminal 30 voltage supply relay (109) 9 -  Automatic gearbox relay AG4 -J60- (175) 10 -  Fuel pump relay (turbo diesel engine unit injectors)-J17- (167) (up to October 2002)  -  Fuel pump relay (TDI-PD) (53) (from November 2002) 11 -  Vacant 12 -  Cigarette lighter relay Australia -J193- (53) 13 -  Vacant

https://portal-diagnostov.com/license.html https://portal-diagnostov.com/license.html Automotive Electricians Portal FZCO Automotive Electricians Portal FZCO Obtenha acesso a todos os diagramas de fiação do carro

SEAT LEON 2005 Glow plug activation control unit:

Glow plug activation control unit:

A -	Glow plug activation control unit -J370- (with engine code ARL only)

 

SEAT LEON 2005 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 2005 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 2005 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 Obtenha acesso a todos os diagramas de fiação do carro 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 Obtenha acesso a todos os diagramas de fiação do carro SEAT LEON 2005 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

https://portal-diagnostov.com/license.html https://portal-diagnostov.com/license.html Automotive Electricians Portal FZCO Automotive Electricians Portal FZCO Obtenha acesso a todos os diagramas de fiação do carro

SEAT LEON 2005 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

https://portal-diagnostov.com/license.html https://portal-diagnostov.com/license.html Automotive Electricians Portal FZCO Automotive Electricians Portal FZCO Obtenha acesso a todos os diagramas de fiação do carro

SEAT LEON 2005 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 2005 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 2005 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

https://portal-diagnostov.com/license.html https://portal-diagnostov.com/license.html Automotive Electricians Portal FZCO Automotive Electricians Portal FZCO Obtenha acesso a todos os diagramas de fiação do carro

SEAT LEON 2005 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 2005 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.

https://portal-diagnostov.com/license.html https://portal-diagnostov.com/license.html Automotive Electricians Portal FZCO Automotive Electricians Portal FZCO Obtenha acesso a todos os diagramas de fiação do carro

SEAT LEON 2005 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-

https://portal-diagnostov.com/license.html https://portal-diagnostov.com/license.html Automotive Electricians Portal FZCO Automotive Electricians Portal FZCO Obtenha acesso a todos os diagramas de fiação do carro

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

 

1 Earth strap, battery - body ⇒ Arrow A

https://portal-diagnostov.com/license.html https://portal-diagnostov.com/license.html Automotive Electricians Portal FZCO Automotive Electricians Portal FZCO Obtenha acesso a todos os diagramas de fiação do carro

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

 

2 Earth strap, gearbox - body ⇒ -arrow-

https://portal-diagnostov.com/license.html https://portal-diagnostov.com/license.html Automotive Electricians Portal FZCO Automotive Electricians Portal FZCO Obtenha acesso a todos os diagramas de fiação do carro

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-

https://portal-diagnostov.com/license.html https://portal-diagnostov.com/license.html Automotive Electricians Portal FZCO Automotive Electricians Portal FZCO Obtenha acesso a todos os diagramas de fiação do carro

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

 

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

https://portal-diagnostov.com/license.html https://portal-diagnostov.com/license.html Automotive Electricians Portal FZCO Automotive Electricians Portal FZCO Obtenha acesso a todos os diagramas de fiação do carro

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

https://portal-diagnostov.com/license.html https://portal-diagnostov.com/license.html Automotive Electricians Portal FZCO Automotive Electricians Portal FZCO Obtenha acesso a todos os diagramas de fiação do carro

SEAT LEON 2005 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