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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



Wiring Diagram  SEAT LEON 2005 - ABS with EDL control unit - brake light switch - brake pedal switch https://portal-diagnostov.com/license.html
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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 2005 - 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 2005 - ABS with EDL control unit - differential lock valve 1 - differential lock valve 2 - ABS inlet valve - rear right - ABS inlet valve - rear left https://portal-diagnostov.com/license.html
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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 2005 - ABS with EDL control unit - longitudinal acceleration sender - ABS inlet valve - front right - ABS outlet valve - front right



Wiring Diagram  SEAT LEON 2005 - ABS with EDL control unit - longitudinal acceleration sender - ABS inlet valve - front right - ABS outlet valve - front right https://portal-diagnostov.com/license.html
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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 2005 - Control unit for ABS with EDS - rear right wheel revolution sensor - front right wheel revolution sensor



Wiring Diagram  SEAT LEON 2005 - Control unit for ABS with EDS - rear right wheel revolution sensor - front right wheel revolution sensor https://portal-diagnostov.com/license.html
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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
  12 Earth point, engine bay left
  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



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 https://portal-diagnostov.com/license.html
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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
  33 Earth point, behind the instrument panel, on the right
  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
   
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1 -  Relay in left engine compartment
q   Position of relays → page 804/2
2 -  Relay on relay plate
q   Position of relays → page 804/3
2 -  Relay on the 13 position additional relay carrier above the relay plate
q   Position of relays → page 804/4

   

Toledo/León Fitting Locations No.  804 / 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
 
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Toledo/León Fitting Locations No.  804 / 3
   


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)
 
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Toledo/León Fitting Locations No.  804 / 4
   


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)
 
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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
 
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Toledo/León Fitting Locations No.  804 / 5
   


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)
 
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SEAT LEON 2005 Overview of fuses

Overview of fuses
   
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1 -  Fuse in fuse holder left dash panel
q   Location → page 802/2
q   Position of fuses → page 802/3
2 -  Auxiliary fuse above additional relay carrier -S37-, -S45-, -S323-, -S111-, -S144-
q   Location → page 802/7
3 -  Fuse on fuse holder -S162-, -S163-, -S164-, -S176-, -S177-, -S178-, -S179-, -S180-, next to battery
q   Location, up to August 2000: → Page 802/8
q   Location, from September 2000: → Page 802/9

   

Toledo/León Fitting Locations No.  802 / 2
   
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.
 
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Toledo/León Fitting Locations No.  802 / 3
   


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  

   

Toledo/León Fitting Locations No.  802 / 4
   


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
17 - -S17- 10A - Vacant (applicable up to October 2001)
Taxi (applicable from November 2001)
 
18 - -S18- 10A - Right headlight main beam  
19 - -S19- 10A - Left main beam  
20 - -S20- 15A - Right dipped beam  
21 - -S21- 15A - Left dipped beam  
22 - -S22- 5A - Side light right  
23 - -S23- 5A - Side light left  
24 - -S224- 20A - Windscreen wiper, washer pump  
25 - -S225- 25A - Heater blower  
26 - -S226- 25A - Heated rear window  
27 - -S227- 15A - Rear window wiper  
28 - -S228- 15A - Fuel pump  
29 - -S229- 10A - Diesel engine control unit  
      15A - applicable up to October 2001:
Petrol engine control unit
 
      15A - applicable from November 2001:
Petrol engine control unit, not for AQN, AUE and BDE
 
      20A - applicable from November 2001:
Engine control units AQN, AUE and BDE
 

   

Toledo/León Fitting Locations No.  802 / 5
   
Position of fuses in fuse holder, left dash panel
No.   Current Flow Diagram designation Nominal value   Function/component Terminal
30 - -S230- 20A - Electrical sunroof  
31 - -S231- 20A - Automatic gearbox - AG4  
      5A - Haldex  
32 - -S232- 10A - Injectors (petrol)  
      30A - Diesel engine control unit  
33 - -S233- 20A - Headlight washer system (HWS)  
34 - -S234- 10A - Diesel engine control unit  
      10A - Petrol engine control unit  
35 - -S235- 30A - Caravan tow coupling delay, luggage compartment power socket  
36 - -S236- 15A - Rear fog lights  
37 - -S237- 10A - applicable up to October 2001:
Signal S (ignition key)
 
      5A - applicable from November 2001:
Diesel engine control unit
 
      20A - applicable from November 2001:
Petrol engine control unit, not for AUE and BDE
 
      30A - applicable from November 2001:
Engine control units AUE and BDE
 
38 - -S238- 10A - Luggage compartment light, central locking  
39 - -S239- 15A - Hazard warning lights system  

   

Toledo/León Fitting Locations No.  802 / 6
   
Position of fuses in fuse holder, left dash panel
No.   Current Flow Diagram designation Nominal value   Function/component Terminal
40 - -S240- 20A - Horns  
41 - -S241- 15A - Cigarette lighter  
42 - -S242- 15A - Radio  
43 - -S243- 10A - Petrol engine control unit  
      10A - Diesel engine control unit  
44 - -S244- 15A - Seat heater  

   

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
 
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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
 
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Toledo/León Fitting Locations No.  802 / 8
   


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
 
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Toledo/León Fitting Locations No.  802 / 9


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
 
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SEAT LEON 2005 Overview of coupling station and connections for wiring harness

Overview of coupling station and connections for wiring harness
   
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1 -  Coupling station in protective housing, in plenum chamber
q   With connectors -T10g-, -T10d-, -T10e-, -T10-, -T6l-, -T10h-, -T10v-
q   Location → page 803/2
2 -  Coupling station, right B-pillar
q   With connector -T10m-
q   Location → page 803/4
3 -  Coupling station on left of C-pillar
q   Location → page 803/4
4 -  Coupling station on left of A-pillar
q   With connector -T10i-
q   Location → page 803/5
5 -  Coupling station in engine compartment, in left wiring harness
q   Location → page 803/5

   

Toledo/León Fitting Locations No.  803 / 2
   
Coupling station in protective housing, in plenum chamber
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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
   
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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

   

Toledo/León Fitting Locations No.  803 / 4
   


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.
 
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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
 
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Toledo/León Fitting Locations No.  803 / 5
   


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.
 
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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.
 
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SEAT LEON 2005 Overview of earth points in engine compartment

Overview of earth points in engine compartment
   
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1 -  Earth point, in centre of plenum chamber -608-
q   Location → page 801/2
2 -  Earth point, in plenum chamber -10-
q   Location → page 801/2
3 -  Earth point, on right in plenum chamber -609-
q   Location → page 801/3
4 -  Earth strap, battery - body -1-
q   Location → page 801/3
5 -  Earth points, in left engine compartment -12-
q   Location → page 801/4
6 -  Earth strap, gearbox - body -2-
q   Location → page 801/4

   

Toledo/León Fitting Locations No.  801 / 2
   
  608 Earth point, in centre of plenum chamber ⇒ -arrow-
 
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  10 Earth point, in plenum chamber ⇒ -arrow-
 
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Toledo/León Fitting Locations No.  801 / 3
   
  609 Earth point, on right in plenum chamber ⇒ -arrow-
 
SEAT LEON 2005 Overview of earth points in engine compartment https://portal-diagnostov.com/license.html
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  1 Earth strap, battery - body
⇒ Arrow A
 
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Toledo/León Fitting Locations No.  801 / 4
   
  12 Earth points, on left in engine compartment ⇒ -arrow B-
 
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  2 Earth strap, gearbox - body ⇒ -arrow-
 
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Toledo/León Fitting Locations No.  801 / 5
   
Overview of earth points in vehicle interior
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1 -  Earth point, lower part of right A-pillar -43-
q   Location → page 801/7
2 -  Earth point, right B-pillar -78-
q   Location → page 801/7
3 -  Earth point, left B-pillar -77-
q   Location → page 801/8
4 -  Earth point, lower part of left A-pillar -44-
q   Location → page 801/8
5 -  Earth point, on right behind dash panel -42-
q   Location → page 801/9
6 -  Earth point, on right behind dash panel -33-
q   Location → page 801/9

   

Toledo/León Fitting Locations No.  801 / 6
   
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7 -  Earth point, on left behind dash panel insert -32-
q   Location → page 801/10
8 -  Earth point, behind dash panel -45-
q   Location → page 801/10

   

Toledo/León Fitting Locations No.  801 / 7
   
  43 Earth point, lower part of right A-pillar ⇒ -arrow-
 
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  78 Earth point on right B-pillar ⇒ -arrow-
 
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Toledo/León Fitting Locations No.  801 / 8
   
  77 Earth point on left B-pillar ⇒ -arrow-
 
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  44 Earth point, lower part of left A-pillar ⇒ -arrow-
 
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Toledo/León Fitting Locations No.  801 / 9
   
  33 Earth point behind dash panel on right ⇒ -arrow-
  42 Same earth point as ⇒ -arrow-
 
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Toledo/León Fitting Locations No.  801 / 10
   
  32 Earth point behind dash panel on left ⇒ -arrow-
 
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  45 Earth point, behind dash panel
 
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Toledo/León Fitting Locations No.  801 / 11
   


SEAT LEON 2005 Overview of earth points in luggage compartment (Toledo)

Overview of earth points in luggage compartment (Toledo)
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1 -  Earth point, on left in luggage compartment -50-
q   Location → page 801/12

   

Toledo/León Fitting Locations No.  801 / 12
   
  50 Earth point, on left in luggage compartment
 
SEAT LEON 2005 Overview of earth points in luggage compartment (Toledo) https://portal-diagnostov.com/license.html
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Toledo/León Fitting Locations No.  801 / 13
   


SEAT LEON 2005 Overview of earth points in luggage compartment (León)

Overview of earth points in luggage compartment (León)
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1 -  Earth point, left rear pillar -57-
q   Location → page 801/14

   

Toledo/León Fitting Locations No.  801 / 14
   
  57 Earth point, left rear pillar
 
SEAT LEON 2005 Overview of earth points in luggage compartment (León) https://portal-diagnostov.com/license.html
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