SEAT LEON 2004 — Four-wheel drive (Syncro) for diesel engines . Wiring diagrams, Pin Connector, Location

Wiring Diagram SEAT LEON 2004 - Four-wheel drive control unit - haldex coupling pump

D	Ignition/starter switch
J...	Engine control units
J104	ABS control unit with EDL
J217	Automatic gearbox control unit
J492	Four-wheel drive control unit
V181	Haldex coupling pump
T10d	10-pin connector, green, in connector protective housing, on left in plenum chamber
50	Earth point, on left in luggage compartment
57	Earth point, left rear pillar
86	Earth connection 1, in rear wiring harness
219	Earth connection 2, in rear lid wiring harness
A2	Positive connection (15), in dash panel wiring harness
A121	Connection (high bus), in dash panel wiring harness
A122	Connection (low bus), in dash panel wiring harness
*	only models with automatic gearbox
**	only Toledo
---	only Leon

Wiring Diagram SEAT LEON 2004 - Fuel pump - Oil pressure control motor - hydraulic temperature sender - fuel gauge sender - four-wheel drive control unit

F	Brake light switch
G	Fuel gauge sender
G6	Fuel system pressurisation pump
G169	Fuel gauge sender 2
G271	Hydraulic temperature sender
J17	Fuel pump relay
J248	Diesel direct injection system control unit
J317	Terminal 30 voltage supply relay
J492	Four-wheel drive control unit
V184	Oil pressure control motor
T2nb	2-pin connector, Syncro
T9b	9-pin connector, on additional relay carrier
T10d	10-pin connector, green, in connector protective housing, on left in plenum chamber
269	Earth connection (sender earth) 1, in dash panel wiring harness
501	Screw connection 2 (30), on relay plate
A32	Positive connection (30), in dash panel wiring harness
A71	Connection (86), in dash panel wiring harness
B131	Connection (54), in interior wiring harness
B429	Connection (EFPR), in main wiring harness

Wiring Diagram SEAT LEON 2004 - Control unit with display in dash panel insert - handbrake warning switch - fuel gauge - coolant temperature gauge

F9	Handbrake warning switch
G1	Fuel gauge
G2	Coolant temperature display sender
G3	Coolant temperature gauge
J285	Control unit with display in dash panel insert
K14	Handbrake warning lamp
T14a	14-pin connector, in left wiring harness
T16	16-pin connector, self-diagnosis
33	Earth point, on right behind dash panel
81	Earth connection 1, in dash panel wiring harness
135	Earth connection 2, in dash panel wiring harness
A76	Connection (diagnosis wire K), in dash panel wiring harness
A115	Connection (handbrake warning), in dash panel wiring harness

SEAT LEON 2004 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 2004 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 2004 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 2004 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 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.

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SEAT LEON 2004 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 2004 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 2004 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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SEAT LEON 2004 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 2004 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 2004 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 2004 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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