AUTOMOTIVE ELECTRICIANS
WIRING-DIAGRAMS

SEAT LEON 2004 – Anti-locking brake system (ABS) with electronic differential lock (EDL), traction control system (TCS), electronic stability program (ESP) and brake pad wear control (Mark 60), not for models with engine codes AMK and BAM . Wiring diagrams, Pin Connector, Location

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Wiring Diagram SEAT LEON 2004 - Anti-locking brake system with electronic differential lock - TCS and ESP



Wiring Diagram SEAT LEON 2004 - Anti-locking brake system with electronic differential lock - TCS and ESPGet access to all wiring diagrams of the carDownload PDF file
ABattery
DIgnition/starter switch
E256TCS and ESP button
FBrake light switch
J104ABS control unit with EDL, TCS and ESP
L71Traction control switch illumination
S9Fuse in relay plate fuse holder
S178Fuse 6 (30) in fuse holder on battery
S179Fuse 7 (30) in fuse holder on battery
T33-pin connector, on the battery
  A2 Positive connection (15), in dash panel wiring harness
  A38 Positive connection 2 (15a), in dash panel wiring harness
  A132 Connection (TCS/ESP), in dash panel wiring harness
  W1 Positive connection 1 (54), in rear wiring harness
*only models with ESP
**only models with TCS

Wiring Diagram SEAT LEON 2004 - Anti-locking brake system with electronic differential lock - TCS and ESP - steering angle sender



Wiring Diagram SEAT LEON 2004 - Anti-locking brake system with electronic differential lock - TCS and ESP - steering angle senderGet access to all wiring diagrams of the carDownload PDF file
G85Steering angle sender
J...Engine control units
J104ABS control unit with EDL, TCS and ESP
J217Automatic gearbox control unit
N133Rear right ABS inlet valve
N134Rear left ABS inlet valve
N135Rear right ABS outlet valve
N136Rear left ABS outlet valve
T6o6-pin connector, next to steering column
T10d10-pin connector, green, in connector protective housing, on left in plenum chamber
  A121 Connection (high bus), in dash panel wiring harness
  A122 Connection (low bus), in dash panel wiring harness
*only models with automatic gearbox
**for models with four-wheel drive only

Wiring Diagram SEAT LEON 2004 - Anti-locking brake system with electronic differential lock - TCS and ESP



Wiring Diagram SEAT LEON 2004 - Anti-locking brake system with electronic differential lock - TCS and ESPGet access to all wiring diagrams of the carDownload PDF file
G45Front right speed sensor
G47Front left speed sensor
J104ABS control unit with EDL, TCS and ESP
N99Front right ABS inlet valve
N100Front right ABS outlet valve
N101Front left ABS inlet valve
N102Front left ABS outlet valve
N227Vehicle stabilization program high pressure valve 1
N228Vehicle stabilization program high pressure valve 2
T2d2-pin connector, on front left ABS sensor
T2e2-pin connector, on front right ABS sensor
*models with brake wear indicator only

Wiring Diagram SEAT LEON 2004 - ABS hydraulic pump - rear speed sensor - ABS control unit with EDL - TCS and ESP - ESP sensor unit



Wiring Diagram SEAT LEON 2004 - ABS hydraulic pump - rear speed sensor - ABS control unit with EDL - TCS and ESP - ESP sensor unitGet access to all wiring diagrams of the carDownload PDF file
G44Rear right speed sensor
G46Rear left speed sensor
G200Lateral acceleration sender
G202Yaw rate sender
G419ESP sensor unit
J104ABS control unit with EDL, TCS and ESP
N225Vehicle stabilization program switch valve 1
N226Vehicle stabilization program switch valve 2
V64ABS hydraulic pump
T2f2-pin connector, on rear left ABS sensor
T2g2-pin connector, on rear right ABS sensor
  D146 Connection (rear left speed sensor +), in engine compartment wiring harness
  D147 Connection (rear left speed sensor -), in engine compartment wiring harness
  D148 Connection (rear right speed sensor +), in engine compartment wiring harness
  D149 Connection (rear right speed sensor -), in engine compartment wiring harness

Wiring Diagram SEAT LEON 2004 - Anti-locking brake system with electronic differential lock - TCS and ESP - brake pressure sender 2



Wiring Diagram SEAT LEON 2004 - Anti-locking brake system with electronic differential lock - TCS and ESP - brake pressure sender 2Get access to all wiring diagrams of the carDownload PDF file
J104ABS control unit with EDL, TCS and ESP
J503Control unit with display for radio and navigation system
G214Brake pressure sender 2
T1616-pin connector, self-diagnosis
  A76 Connection (diagnosis wire K), in dash panel wiring harness
  A133 Connection (left ABS impulse), in dash panel wiring harness
  A134 Connection (right ABS impulse), in dash panel wiring harness
*only models with navigation system (MFD) with colour display

Wiring Diagram SEAT LEON 2004 - Control unit with display in dash panel insert - handbrake warning switch - brake fluid level warning contact - trailer operation warning lamp



Wiring Diagram SEAT LEON 2004 - Control unit with display in dash panel insert - handbrake warning switch - brake fluid level warning contact - trailer operation warning lampGet access to all wiring diagrams of the carDownload PDF file
E3Hazard warning light switch
F9Handbrake warning switch
F34Brake fluid level warning contact
J217Automatic gearbox control unit
J285Control unit with display in dash panel insert
K18Trailer operation warning lamp
K47ABS warning lamp
K118Brake system warning lamp
S15Fuse in relay plate fuse holder
T10g10-pin connector, grey, in connector protective housing, on left in plenum chamber
  176 Earth connection, in right headlight wiring harness
  179 Earth connection, in left headlight wiring harness
  501 Screw connection 2 (30), on relay plate
  A52 Positive connection 2 (30), in dash panel wiring harness
  A76 Connection (diagnosis wire K), in dash panel wiring harness
  A115 Connection (handbrake warning), in dash panel wiring harness
*only models with automatic gearbox

Wiring Diagram SEAT LEON 2004 - Control unit in dash panel insert - front left brake pad wear sender - brake pad warning lamp



Wiring Diagram SEAT LEON 2004 - Control unit in dash panel insert - front left brake pad wear sender - brake pad warning lampGet access to all wiring diagrams of the carDownload PDF file
G34Front left brake pad wear sender
J...Engine control units
J255Climatronic control unit
J285Control unit with display in dash panel insert
K32Brake pad warning lamp
K155Electronic stabilisation program warning lamp
T1010-pin connector, orange, in connector protective housing, on left in plenum chamber
T12d12-pin connector, on Climatronic
  81 Earth connection 1, in dash panel wiring harness
  135 Earth connection 2, in dash panel wiring harness
  D53 Connection (right brake wear indicator) in engine compartment wiring harness
  D54 Connection (right brake wear indicator) in engine compartment wiring harness
*models with brake wear indicator only


SEAT LEON 2004 Overview of fuses

Overview of fuses
   
SEAT LEON 2004 Overview of fusesGet access to all wiring diagrams of the carDownload PDF file
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:

   
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SEAT LEON 2004 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 2004 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
 
SEAT LEON 2004 Position of fuses in fuse holder, left dash panelGet access to all wiring diagrams of the carDownload PDF file
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
 
SEAT LEON 2004 Position of fuses in fuse holder, left dash panelGet access to all wiring diagrams of the carDownload PDF file

SEAT LEON 2004 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
 
SEAT LEON 2004 Fuse on fuse holder, next to battery (up to August 2000):Get access to all wiring diagrams of the carDownload PDF file

SEAT LEON 2004 Fuse on fuse holder, next to battery (from September 2000):

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SEAT LEON 2004 Overview of earth points in engine compartment

Overview of earth points in engine compartment
   
SEAT LEON 2004 Overview of earth points in engine compartmentGet access to all wiring diagrams of the carDownload PDF file

   
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  10 Earth point, in plenum chamber ⇒ -arrow-
 
SEAT LEON 2004 Overview of earth points in engine compartmentGet access to all wiring diagrams of the carDownload PDF file
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  1 Earth strap, battery - body
⇒ Arrow A
 
SEAT LEON 2004 Overview of earth points in engine compartmentGet access to all wiring diagrams of the carDownload PDF file
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  2 Earth strap, gearbox - body ⇒ -arrow-
 
SEAT LEON 2004 Overview of earth points in engine compartmentGet access to all wiring diagrams of the carDownload PDF file
Overview of earth points in vehicle interior
SEAT LEON 2004 Overview of earth points in engine compartmentGet access to all wiring diagrams of the carDownload PDF file

   
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  78 Earth point on right B-pillar ⇒ -arrow-
 
SEAT LEON 2004 Overview of earth points in engine compartmentGet access to all wiring diagrams of the carDownload PDF file
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  44 Earth point, lower part of left A-pillar ⇒ -arrow-
 
SEAT LEON 2004 Overview of earth points in engine compartmentGet access to all wiring diagrams of the carDownload PDF file
  33 Earth point behind dash panel on right ⇒ -arrow-
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  45 Earth point, behind dash panel
 
SEAT LEON 2004 Overview of earth points in engine compartmentGet access to all wiring diagrams of the carDownload PDF file

SEAT LEON 2004 Overview of earth points in luggage compartment (Toledo)

Overview of earth points in luggage compartment (Toledo)
SEAT LEON 2004 Overview of earth points in luggage compartment (Toledo)Get access to all wiring diagrams of the carDownload PDF file

   
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SEAT LEON 2004 Overview of coupling station and connections for wiring harness

Overview of coupling station and connections for wiring harness
   
SEAT LEON 2004 Overview of coupling station and connections for wiring harnessGet access to all wiring diagrams of the carDownload PDF file
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
SEAT LEON 2004 Overview of coupling station and connections for wiring harnessGet access to all wiring diagrams of the carDownload PDF file
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

   
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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 2004 Coupling station, right B-pillar

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SEAT LEON 2004 Coupling station on left of C-pillar

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SEAT LEON 2004 Coupling station on left of A-pillar

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SEAT LEON 2004 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.
 
SEAT LEON 2004 Coupling station in engine compartment, in left wiring harnessGet access to all wiring diagrams of the carDownload PDF file
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