AUTOMOTIVE ELECTRICIANS
WIRING-DIAGRAMS

SEAT LEON 2003 – 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

    HomeSEATSEAT LEONSEAT LEON 2003SEAT LEON 2003 ALL WIRING DIAGRAMS - ENGLISH

Wiring Diagram SEAT LEON 2003 - ABS with EDL control unit - brake light switch - brake pedal switch



Wiring Diagram SEAT LEON 2003 - ABS with EDL control unit - brake light switch - brake pedal switch
ABattery
FBrake light switch
F63Brake pedal switch
J...Engine control units
J104ABS with EDL control unit
J217Automatic gearbox control unit
J317Terminal 30 voltage supply relay
S5Fuse in fuse box/relay plate
S13Fuse in fuse box/relay plate
S178Fuse -6- (30), in fuse box/battery
S179Fuse -7- (30), in fuse box/battery
S243Fuse in fuse box
T10d10-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 2003 - ABS with EDL control unit - differential lock valve 1 - differential lock valve 2 - ABS inlet valve - rear right - ABS inlet valve - rear left



Wiring Diagram SEAT LEON 2003 - ABS with EDL control unit - differential lock valve 1 - differential lock valve 2 - ABS inlet valve - rear right - ABS inlet valve - rear leftUnlock Lifetime Access for This Car.
DIgnition/starter switch
J104ABS with EDL control unit
N125Differential lock valve 1
N126Differential lock valve 2
N133ABS inlet valve, rear right
N134ABS inlet valve, rear left
N135ABS outlet valve, rear right
N136ABS outlet valve, rear left
S9Fuse in fuse box/relay plate
V64Hydraulic pump
T22-pin connector
T1616-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 2003 - ABS with EDL control unit - longitudinal acceleration sender - ABS inlet valve - front right - ABS outlet valve - front right



Wiring Diagram SEAT LEON 2003 - ABS with EDL control unit - longitudinal acceleration sender - ABS inlet valve - front right - ABS outlet valve - front rightUnlock Lifetime Access for This Car.
G251Longitudinal acceleration sender
J104ABS with EDL control unit
J503Control unit with display for radio and navigation
N99ABS inlet valve, front right
N100ABS outlet valve, front right
N101ABS inlet valve, front left
N102ABS 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 2003 - Control unit for ABS with EDS - rear right wheel revolution sensor - front right wheel revolution sensor



Wiring Diagram SEAT LEON 2003 - Control unit for ABS with EDS - rear right wheel revolution sensor - front right wheel revolution sensorUnlock Lifetime Access for This Car.
G44Rear right wheel revolution sensor
G45Front right wheel revolution sensor
G46Rear right wheel revolution sensor
G47Front left wheel revolution sensor
J104Control unit for ABS with EDS
T2d2-way connector, ABS sensor, front left
T2e2-way connector, ABS sensor, front right
T2f2-way connector, ABS sensor, rear left
T2g2-way connector, ABS sensor, rear right
T2525-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 2003 - Control unit for ABS with EDS - control unit with warning lamps on the instrument panel - brake lining/pad wear sender - front left



Wiring Diagram SEAT LEON 2003 - Control unit for ABS with EDS - control unit with warning lamps on the instrument panel - brake lining/pad wear sender - front leftUnlock Lifetime Access for This Car.
G34Brake lining/pad wear sender, front left
J104Control unit for ABS with EDS
J285Control unit with warning lamps on instrument panel
K32Brake pad/lining warning lamp
K47ABS warning lamp
T2525-way connector
T3232-way connector, blue, instrument panel
T32a32-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 2003 Overview of relay

Overview of relay
   
SEAT LEON 2003 Overview of relayUnlock Lifetime Access for This Car.
1 - 
2 -  Relay on relay plate
q   Position of relays
2 - 

   

SEAT LEON 2003 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 2003 Relay on relay plateUnlock Lifetime Access for This Car.

SEAT LEON 2003 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)
 
SEAT LEON 2003 Relay on the 13 position additional relay carrier above the relay plateUnlock Lifetime Access for This Car.
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
 
SEAT LEON 2003 Relay on the 13 position additional relay carrier above the relay plateUnlock Lifetime Access for This Car.

SEAT LEON 2003 Glow plug activation control unit:



SEAT LEON 2003 Overview of fuses

Overview of fuses
   
SEAT LEON 2003 Overview of fusesUnlock Lifetime Access for This Car.
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:

   

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
 
SEAT LEON 2003 Position of fuses in fuse holder, left dash panelUnlock Lifetime Access for This 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
 
SEAT LEON 2003 Position of fuses in fuse holder, left dash panelUnlock Lifetime Access for This 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
 
SEAT LEON 2003 Fuse on fuse holder, next to battery (up to August 2000):Unlock Lifetime Access for This Car.

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



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

Overview of coupling station and connections for wiring harness
   
SEAT LEON 2003 Overview of coupling station and connections for wiring harnessUnlock Lifetime Access for This Car.
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 2003 Overview of coupling station and connections for wiring harnessUnlock Lifetime Access for This Car.
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

   
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



SEAT LEON 2003 Coupling station on left of C-pillar

SEAT LEON 2003 Coupling station on left of A-pillar


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.
 
SEAT LEON 2003 Coupling station in engine compartment, in left wiring harnessUnlock Lifetime Access for This Car.


SEAT LEON 2003 Overview of earth points in engine compartment

Overview of earth points in engine compartment
   
SEAT LEON 2003 Overview of earth points in engine compartmentUnlock Lifetime Access for This Car.

   
  10 Earth point, in plenum chamber ⇒ -arrow-
 
SEAT LEON 2003 Overview of earth points in engine compartmentUnlock Lifetime Access for This Car.
  1 Earth strap, battery - body
⇒ Arrow A
 
SEAT LEON 2003 Overview of earth points in engine compartmentUnlock Lifetime Access for This Car.
  2 Earth strap, gearbox - body ⇒ -arrow-
 
SEAT LEON 2003 Overview of earth points in engine compartmentUnlock Lifetime Access for This Car.
Overview of earth points in vehicle interior
SEAT LEON 2003 Overview of earth points in engine compartmentUnlock Lifetime Access for This Car.

   

   
  78 Earth point on right B-pillar ⇒ -arrow-
 
SEAT LEON 2003 Overview of earth points in engine compartmentUnlock Lifetime Access for This Car.
  44 Earth point, lower part of left A-pillar ⇒ -arrow-
 
SEAT LEON 2003 Overview of earth points in engine compartmentUnlock Lifetime Access for This Car.
  33 Earth point behind dash panel on right ⇒ -arrow-
  45 Earth point, behind dash panel
 
SEAT LEON 2003 Overview of earth points in engine compartmentUnlock Lifetime Access for This Car.

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

Overview of earth points in luggage compartment (Toledo)
SEAT LEON 2003 Overview of earth points in luggage compartment (Toledo)Unlock Lifetime Access for This Car.

   

   
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