SEAT LEON 2003 — 1.6 l Simos/74 kW, engine codes AKL . Wiring diagrams, Pin Connector, Location

Wiring Diagram SEAT LEON 2003 - Battery - starter - alternator - voltage regulator - ignition/starter switch - X contact relief relay

A	Battery
B	Starter
C	Alternator
C1	Voltage regulator
D	Ignition/starter switch
J59	X contact relief relay
S11	Fuse in fuse box/relay plate
T2k	2-pin connector, on engine
T4l	4-pin connector, on engine
T6l	6-pin connector, brown, in protective housing for connectors, on left in plenum chamber
500	Screw connection -1- (30), on relay plate
501	Screw connection -2- (30), on relay plate
502	Screw connection -1- (30a), on relay plate
A2	Positive (+) connection (15), in dash panel wiring harness
A32	Positive (+) connection (30), in dash panel wiring harness
D97	Connection (50), in engine compartment right wiring harness
*	Only models with air conditioner
**	Only models with manual gearbox
***	Only models with automatic gearbox

Wiring Diagram SEAT LEON 2003 - Simos control unit - coolant temperature sender - Hall sender - ignition transformer - spark plug connector - spark plugs

G2	Coolant temperature sender
G40	Hall sender
G62	Coolant temperature sender
J361	Simos control unit
N152	Ignition transformer
P	Spark plug connector
Q	Spark plugs
T3q	3-pin connector
T6l	6-pin connector, brown, in protective housing for connectors, on left in plenum chamber
T14a	14-pin connector, in cable channel left
220	Earth connection (sender earth), in engine wiring harness
A104	Positive (+) connection -2- (15), in dash panel wiring harness
D78	Positive (+) connection -1- (30a), in engine compartment wiring harness
D101	Connection -1-, in engine compartment wiring harness

Wiring Diagram SEAT LEON 2003 - Simos control unit - throttle valve control unit - idling switch - power assisted steering pressure switch - engine speed sender

E35	Air conditioner switch
F60	Idling switch
F88	Power assisted steering pressure switch
G28	Engine speed sender
G69	Throttle valve potentiometer
G88	Throttle valve positioner potentiometer
J217	Automatic gearbox control unit
J226	Starter inhibitor and reversing light relay
J255	Climatronic control unit
J293	Radiator fan control unit
J338	Throttle valve control unit
J361	Simos control unit
V60	Throttle valve positioner
T3d	3-pin connector, near intake manifold
T10	10-pin connector, orange, in protective housing for connectors, on left in plenum chamber
220	Earth connection (sender earth), in engine wiring harness
*	Only models with multi-function display
**	Only models with automatic gearbox
***	Only models with manual gearbox

Wiring Diagram SEAT LEON 2003 - Simos control unit - knock sensor I - injector cylinder 1 - injector cylinder 2 - injector cylinder 3 - injector cylinder 4

F36	Clutch pedal switch
G61	Knock sensor I
J104	ABS with EDL control unit
J217	Automatic gearbox control unit
J293	Radiator fan control unit
J361	Simos control unit
N30	Injector, cylinder 1
N31	Injector, cylinder 2
N32	Injector, cylinder 3
N33	Injector, cylinder 4
S232	Fuse in fuse box
T3e	3-pin connector, near intake manifold
T10	10-pin connector, orange, in protective housing for connectors, on left in plenum chamber
T10d	10-pin connector, green, in protective housing for connectors, on left in plenum chamber
T14a	14-pin connector, in cable channel left
10	Earth point, in plenum chamber
B168	Connection (86), in interior wiring harness
D95	Connection (injectors), in engine compartment wiring harness
D102	Connection -2-, in engine compartment wiring harness
*	Only models with automatic gearbox

Wiring Diagram SEAT LEON 2003 - Simos control unit - lambda probe - air mass meter - activated charcoal filter system solenoid valve 1 - intake manifold change-over valve

F	Brake light switch
G39	Lambda probe
G70	Air mass meter
J17	Fuel pump relay
J234	Airbag control unit
J361	Simos control unit
N80	Activated charcoal filter system solenoid valve 1 (pulsed)
N156	Intake manifold change-over valve
Z19	Lambda probe heater
T4p	4-pin connector, centre in engine compartment
T6l	6-pin connector, brown, in protective housing for connectors, on left in plenum chamber
T10	10-pin connector, orange, in protective housing for connectors, on left in plenum chamber
T10e	10-pin connector, black, in protective housing for connectors, on left in plenum chamber
A125	Connection (crash signal), in dash panel wiring harness
E30	Connection (87a), in engine wiring harness
W1	Positive (+) connection -1- (54), in rear wiring harness
*	Wire W for self-diagnosis

Wiring Diagram SEAT LEON 2003 - Fuel gauge sender - fuel pump (pre-supply pump) - coolant shortage indicator sender

G	Fuel gauge sender
G6	Fuel pump (pre-supply pump)
G32	Coolant shortage indicator sender
N79	Heater element (crankcase breather)
T6l	6-pin connector, brown, in protective housing for connectors, on left in plenum chamber
T14a	14-pin connector, in cable channel left
10	Earth point, in plenum chamber
33	Earth point, on right behind dash panel
81	Earth connection -1-, in dash panel wiring harness
114	Earth connection, in automatic gearbox wiring harness
269	Earth connection (sender earth) -1-, in dash panel wiring harness
504	Screw connection -1- (87F), on relay plate
A99	Connection -1- (87), in dash panel wiring harness
A100	Connection -2- (87), in dash panel wiring harness
*	Only models with manual gearbox
**	Only models with automatic gearbox

Wiring Diagram SEAT LEON 2003 - Control unit with display in dash panel insert - oil pressure switch - speedometer sender - oil pressure warning buzzer - alternator warning lamp

F1	Oil pressure switch
G22	Speedometer sender
H11	Oil pressure warning buzzer
J285	Control unit with display in dash panel insert
K2	Alternator warning lamp
K3	Oil pressure warning lamp
K28	Coolant temperature warning lamp/coolant shortage warning lamp
K83	Exhaust emissions warning lamp
K132	Electronic power control fault lamp
S7	Fuse in fuse box/relay plate
T10	10-pin connector, orange, in protective housing for connectors, on left in plenum chamber
T14a	14-pin connector, in cable channel left
10	Earth point, in plenum chamber
85	Earth connection -1-, in engine compartment wiring harness
B163	Positive (+) connection -1- (15), in interior wiring harness
*	Wire W for self-diagnosis

Wiring Diagram SEAT LEON 2003 - Control unit with display in dash panel insert - multi-function display - multi-function display call-up button - multi-function display - memory switch

E86	Multi-function display call-up button
E109	Multi-function display, memory switch
G1	Fuel gauge
G3	Coolant temperature gauge
G5	Rev. counter
G21	Speedometer
J119	Multi-function display
J255	Climatronic control unit
J285	Control unit with display in dash panel insert
K105	Reserve fuel warning lamp
T6d	6-pin connector
T12d	12-pin connector, on Climatronic
A13	Connection (door contact switch), in dash panel wiring harness
A27	Connection (speed signal), in dash panel wiring harness
*	Only models with multi-function display

SEAT LEON 2003 Overview of relay

Overview of relay    

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 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)

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Toledo/León	Fitting Locations	No.  804 / 4

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)

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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 2003 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 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-, -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

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

Toledo/León	Fitting Locations	No.  803 / 4

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.

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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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Toledo/León	Fitting Locations	No.  803 / 5

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.

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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 -	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 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

Toledo/León	Fitting Locations	No.  802 / 4

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
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 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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Toledo/León	Fitting Locations	No.  802 / 9

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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SEAT LEON 2003 Overview of earth points in engine compartment

Overview of earth points in engine compartment    

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-

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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

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

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 2003 Overview of earth points in luggage compartment (Toledo)

Overview of earth points in luggage compartment (Toledo)

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

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Toledo/León	Fitting Locations	No.  801 / 13

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

Overview of earth points in luggage compartment (León)

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

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