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Wiring Diagram SEAT LEON 2012 - Aerial - GPS aerial - control unit with display for radio and navigation system
| A | Battery |
| J503 | Control unit with display for radio and navigation system |
| J519 | Onboard supply control unit |
| J533 | Data bus diagnostic interface |
| R11 | Aerial |
| R50 | GPS aerial |
| R36 | Telephone transmitter and receiver unit |
| T16c | 16-pin connector, on radio, consists of two 8-pin connectors |
| T40 | 40-pin connector, under electronics box, in left engine compartment |
| 372 | Earth connection 7, in main wiring harness |
| 507 | Screw connection (30), on fuse holder on battery |
| 610 | Earth point (audio), front under centre console |
| A178 | Connection (infotainment CAN bus, high), in dash panel wiring harness |
| A179 | Connection (infotainment CAN bus, low), in dash panel wiring harness |
| A189 | Positive connection 5 (30a), in dash panel wiring harness |
| * | for models with CD changer only |
| ** | only models with telephone Bluetooth |
Wiring Diagram SEAT LEON 2012 - Front left and right treble loudspeaker - front right and left bass loudspeaker - control unit with display for radio and navigation system
| J503 | Control unit with display for radio and navigation system |
| J519 | Onboard supply control unit |
| R20 | Front left treble loudspeaker |
| R21 | Front left bass loudspeaker |
| R22 | Front right treble loudspeaker |
| R23 | Front right bass loudspeaker |
| T16c | 16-pin connector, on radio, consists of two 8-pin connectors |
| T20a | 20-pin connector, driver side A-pillar |
| T20b | 20-pin connector, front passenger side A-pillar |
| * | only models up to October 2007 |
| ** | only models from November 2007 |
Wiring Diagram SEAT LEON 2012 - Rear left and right treble loudspeaker - rear right and left bass loudspeaker - control unit with display for radio and navigation system
| J503 | Control unit with display for radio and navigation system |
| J519 | Onboard supply control unit |
| R14 | Rear left treble loudspeaker |
| R15 | Rear left bass loudspeaker |
| R16 | Rear right treble loudspeaker |
| R17 | Rear right bass loudspeaker |
| T16c | 16-pin connector, on radio, consists of two 8-pin connectors |
| T20e | 20-pin connector, left B-pillar |
| T20f | 20-pin connector, right B-pillar |
| * | only models with 8 loudspeakers |
Wiring Diagram SEAT LEON 2012 - CD changer - control unit with display for radio and navigation system
| J503 | Control unit with display for radio and navigation system |
| J519 | Onboard supply control unit |
| R41 | CD changer |
| T12 | 12-pin connector |
| T12a | 12-pin connector |
| * | for models with CD changer only |
SEAT LEON 2012
SEAT LEON 2012 Control units overview
| 1 - | Convenience system central control unit -J393- |
| q | Location → page 805/5 |
| q | Connector assigment → page 805/6 |
| q | Connector → page 805/6 |
| 2 - | Airbag control unit -J234- |
| q | from April 2005: |
| q | Location → page 805/7 |
| q | 50-pin connector assigment → page 805/8 |
| q | 50-pin connector → page 805/8 |
| q | 75-pin connector assigment → page 805/9 |
| q | 75-pin connector → page 805/9 |
| q | from November 2007: |
| q | 100-pin connector assigment → page 805/10 |
| q | 100-pin connector → page 805/10 |
| León | Fitting Locations | No. 805 / 2 |
| 3 - | Front passenger side door control unit -J387- |
| q | Location → page 805/11 |
| q | Connector assigment → page 805/12 |
| q | Connector → page 805/12 |
| 4 - | Headlight range control, control unit -J431- |
| q | Location → page 805/13 |
| q | Connector assigment → page 805/14 |
| q | Connector → page 805/14 |
| 5 - | Cornering light and headlight range control unit -J745- |
| q | from May 2005: |
| q | Location → page 805/15 |
| q | Connector assigment → page 805/16 |
| q | Connector → page 805/16 |
| 6 - | Rear right door control unit -J389- |
| q | Location → page 805/17 |
| q | Connector assigment → page 805/18 |
| q | Connector → page 805/18 |
| León | Fitting Locations | No. 805 / 3 |
| 7 - | Fuel pump control unit -J538- |
| q | Location → page 805/19 |
| q | Connector assigment → page 805/20 |
| q | Connector → page 805/20 |
| 8 - | Rear left door control unit -J388- |
| q | Location → page 805/21 |
| q | Connector assigment → page 805/22 |
| q | Connector → page 805/22 |
| 9 - | Sliding sunroof adjustment control unit -J245- |
| q | Location → page 805/23 |
| q | Connector assigment → page 805/24 |
| q | Connector → page 805/24 |
| 10 - | Driver door control unit -J386- |
| q | Location → page 805/25 |
| q | Connector assigment → page 805/26 |
| q | Connector → page 805/26 |
| León | Fitting Locations | No. 805 / 4 |
| 11 - | Data bus diagnostic interface -J533- |
| q | Location → page 805/27 |
| q | Connector assigment → page 805/28 |
| q | Connector → page 805/28 |
| 12 - | Steering column electronics control unit -J527- |
| q | Location → page 805/29 |
| q | Connector assigment → page 805/30 |
| q | Connector → page 805/30 |
| 13 - | Onboard supply control unit -J519- |
| q | Location → page 805/31 |
| q | Connector → page 805/32 |
| q | Description of signal → page 805/33 |
| 14 - | Display control unit in dash panel insert -J285- |
| q | Location → page 805/39 |
| q | Connector assigment → page 805/40 |
| q | Connector → page 805/40 |
| León | Fitting Locations | No. 805 / 5 |
|
|
| León | Fitting Locations | No. 805 / 6 |
| Connector assigment: |
| A - | Convenience system central control unit -J393- |
| Connector: |
| B - | is not installed |
| C - | 18-pin connector -T18-, in wiring harness |
| D - | 8-pin connector -T8-, in wiring harness |
| E - | 6-pin connector -T6-, in wiring harness |
| F - | 18-pin connector -T18a-, in wiring harness |
| León | Fitting Locations | No. 805 / 7 |
|
|
| León | Fitting Locations | No. 805 / 8 |
| 50-pin connector assigment: |
| A - | Airbag control unit -J234- |
| 50-pin connector: |
| B - | 50-pin connector -T50-, in wiring harness |
| León | Fitting Locations | No. 805 / 9 |
| 75-pin connector assigment: |
| A - | Airbag control unit -J234- |
| 75-pin connector: |
| B - | 75-pin connector -T75-, in wiring harness |
| León | Fitting Locations | No. 805 / 10 |
| 100-pin connector assigment: |
| A - | Airbag control unit -J234- |
| 100-pin connector: |
| B - | 100-pin connector, -T100-, in wiring harness |
| León | Fitting Locations | No. 805 / 11 |
|
|
| León | Fitting Locations | No. 805 / 12 |
| Connector assigment: |
| A - | Front passenger side door control unit -J387- |
| Connector: |
| B - | 20-pin connector -T20h-, in wiring harness |
| C - | 16-pin connector -T16a-, in wiring harness |
| D - | 32-pin connector -T32a-, in wiring harness |
| León | Fitting Locations | No. 805 / 13 |
|
|
| León | Fitting Locations | No. 805 / 14 |
| Connector assigment: |
| A - | Headlight range control, control unit -J431- |
| Connector: |
| B - | 26-pin connector -T26-, in wiring harness |
| León | Fitting Locations | No. 805 / 15 |
|
|
| León | Fitting Locations | No. 805 / 16 |
| Connector assigment: |
| A - | Cornering light and headlight range control unit -J745- |
| Connector: |
| B - | 26-pin connector -T26-, in wiring harness |
| León | Fitting Locations | No. 805 / 17 |
|
|
| León | Fitting Locations | No. 805 / 18 |
| Connector assigment: |
| A - | Rear right door control unit -J389- |
| Connector: |
| B - | 18-pin connector -T18c-, in wiring harness |
| León | Fitting Locations | No. 805 / 19 |
|
|
| León | Fitting Locations | No. 805 / 20 |
| Connector assigment: |
| A - | Fuel pump control unit -J538- |
| q | Engines BLR, BVY, BVZ, BWA, BWA1 BWJ, BZB and CAXC |
| Connector: |
| B - | 10-pin connector -T10l-, in wiring harness |
| León | Fitting Locations | No. 805 / 21 |
|
|
| León | Fitting Locations | No. 805 / 22 |
| Connector assigment: |
| A - | Rear left door control unit -J388- |
| Connector: |
| B - | 18-pin connector -T18b-, in wiring harness |
| León | Fitting Locations | No. 805 / 23 |
|
|
| León | Fitting Locations | No. 805 / 24 |
| Connector assigment: |
| A - | Sliding sunroof adjustment control unit -J245- |
| Connector: |
| B - | 6-pin connector -T6c-, in wiring harness |
| C - | 6-pin connector -T6d-, on control unit extension |
| León | Fitting Locations | No. 805 / 25 |
|
|
| León | Fitting Locations | No. 805 / 26 |
| Connector assigment: |
| A - | Driver door control unit -J386- |
| Connector: |
| B - | 20-pin connector -T20g-, in wiring harness |
| C - | 16-pin connector -T16b-, in wiring harness |
| D - | 32-pin connector -T32-, in wiring harness |
| León | Fitting Locations | No. 805 / 27 |
|
|
| León | Fitting Locations | No. 805 / 28 |
| Connector assigment: |
| A - | Data bus diagnostic interface -J533- |
| Connector: |
| B - | 20-pin connector -T20-, in wiring harness |
| León | Fitting Locations | No. 805 / 29 |
|
|
| León | Fitting Locations | No. 805 / 30 |
| Connector assigment: |
| A - | Steering column electronics control unit -J527- |
| Connector: |
| B - | 4-pin connector, Tiptronic switch |
| C - | 10-pin connector, gear stick illumination and CCS |
| D - | 12-pin connector, ignition/starter switch and ignition key withdrawal lock |
| E - | 8-pin connector, windscreen wiper switch and multifunction switch |
| F - | 10-pin connector, steering angle sender (from May 2008, for left-handdrive vehicles only) |
| G - | 10-pin connector, airbag coil connector, operating unit and horn in steering wheel |
| H - | 4-pin connector -T4f-, in wiring harness |
| J - | 20-pin connector -T20d-, in wiring harness |
| León | Fitting Locations | No. 805 / 31 |
|
|
| León | Fitting Locations | No. 805 / 32 |
| Pin connector: |
| A - | 11-pin connector |
| B - | 12-pin connector |
| C - | 12-pin connector |
| D - | 11-pin connector |
| E - | 16-pin connector |
| F - | 8-pin connector |
| G - | 12-pin connector |
| H - | Vacant |
| I - | 2-pin connector |
| J - | 6-pin connector |
| K - | 10-pin connector |
| L - | 2-pin connector |
| León | Fitting Locations | No. 805 / 33 |
| Description of signal onboard power supply control unit -J519- |
| Connector | Pin | Terminal | Equipment H | Equipment M |
| A | 1 | Supply (30), right lights | x | x |
| A | 2 | Right dipped beam signal output | x | x |
| A | 3 | Right main beam signal output | x | x |
| A | 4 | Right fog light signal output | x | - |
| A | 5 | Signal output for the activation of the gas discharge headlights on the right | x | - |
| A | 6 | Signal output for front right turn signal | x | x |
| A | 7 | Front left side light signal output | x | x |
| A | 8 | Signal output for left side repeater turn signal | x | x |
| A | 9 | Signal earth (31), left lights | x | x |
| A | 10 | Fuel pump relay signal output | x | x |
| A | 11 | Voltage supply relay (50) signal output | x | x |
| B | 1 | Right reversing light signal output | x | x |
| B | 2 | - | - | |
| B | 3 | - | - | |
| B | 4 | Rear left fog light signal output | x | x |
| B | 5 | Right brake and tail light signal output | x | x |
| B | 6 | - | - | |
| B | 7 | Footwell light signal output | x | x |
| B | 8 | - | - |
| León | Fitting Locations | No. 805 / 34 |
| Connector | Pin | Terminal | Equipment H | Equipment M |
| B | 9 | Right tail light signal output | x | x |
| B | 10 | Signal output for rear right turn signal | x | x |
| B | 11 | Interior lighting, door contact switch signal output | x | x |
| B | 12 | Illumination - switches and instruments (58d) signal output | x | x |
| C | 1 | Signal output for switching heated seat off | x | x |
| C | 2 | Left brake and tail light signal output | x | x |
| C | 3 | Rear right fog light signal output | x | x |
| C | 4 | - | - | |
| C | 5 | Left seat backrest switch signal output | x | x |
| C | 6 | Right seat backrest switch signal output | x | x |
| C | 7 | - | - | |
| C | 8 | Number plate light signal output | x | x |
| C | 9 | High level brake light signal output | x | x |
| C | 10 | Left tail light signal output | x | x |
| C | 11 | Left tail light signal output | x | x |
| C | 12 | Left reversing light signal output | x | x |
| D | 1 | Supply (30), left lights | x | x |
| D | 2 | Left fog light signal output | x | - |
| D | 3 | Left main beam signal output | x | x |
| D | 4 | Left dipped beam signal output | x | x |
| León | Fitting Locations | No. 805 / 35 |
| Connector | Pin | Terminal | Equipment H | Equipment M |
| D | 5 | Signal earth (31), right lights | x | x |
| D | 6 | Signal output for the activation of the gas discharge headlights on the left | x | - |
| D | 7 | Supply (15) output signal, engine relay | x | x |
| D | 8 | Headlight washer system relay signal output | x | x |
| D | 9 | Signal output for right side repeater turn signal | x | x |
| D | 10 | Front right side light signal output | x | x |
| D | 11 | Signal output for front left turn signal | x | x |
| E | 1 | Side light switch signal input | x | x |
| E | 2 | Brake light switch signal input | x | x |
| E | 3 | Come-Home potentiometer earth | x | x |
| E | 4 | Come-Home potentiometer supply | x | x |
| E | 5 | - | - | |
| E | 6 | Fog light switch signal input | x | - |
| E | 7 | Selector lever lock P/N signal input | x | x |
| E | 8 | Dipped beam switch input signal | x | x |
| E | 9 | - | - | |
| E | 10 | - | - | |
| E | 11 | - | - |
| León | Fitting Locations | No. 805 / 36 |
| Connector | Pin | Terminal | Equipment H | Equipment M |
| E | 12 | Come-Home potentiometer input signal | x | x |
| E | 13 | Rear fog light switch signal input | x | x |
| E | 14 | Automatic driving lights switch signal input | x | x |
| E | 15 | - | - | |
| E | 16 | Light switch position "0" signal input | x | x |
| F | 1 | Signal input (50), diagnosis | x | x |
| F | 2 | Signal input (15), diagnosis engine | x | x |
| F | 3 | LIN-Bus | x | x |
| F | 4 | Signal (L) alternator | x | x |
| F | 5 | Bonnet switch input signal | x | x |
| F | 6 | Reversing light switch signal input | x | x |
| F | 7 | Input signal for reference voltage (30) | x | x |
| F | 8 | Input signal for earth - reference voltage (31) | x | x |
| G | 1 | Voltage supply (50) for ignition/starter switch signal input | x | x |
| G | 2 | Hazard warning light system warning lamp signal input | x | x |
| G | 3 | Heated rear window warning lamp signal input | x | x |
| G | 4 | Signal earth for illumination regulators - switches and instruments (31) | x | x |
| G | 5 | - | - | |
| G | 6 | Heated rear window button input signal | x | x |
| León | Fitting Locations | No. 805 / 37 |
| Connector | Pin | Terminal | Equipment H | Equipment M |
| G | 7 | Convenience CAN-L | x | x |
| G | 8 | Convenience CAN-H | x | x |
| G | 9 | Hazard warning light switch signal input | x | x |
| G | 10 | Supply for switches and instruments illumination regulator | x | x |
| G | 11 | Voltage supply (15) for ignition/starter switch signal input | x | x |
| G | 12 | Switches and instruments illumination regulator signal input | x | x |
| H | 1 | - | - | |
| H | 2 | - | - | |
| H | 3 | - | - | |
| H | 4 | - | - | |
| H | 5 | - | - | |
| H | 6 | - | - | |
| H | 7 | - | - | |
| H | 8 | - | - | |
| H | 9 | - | - | |
| H | 10 | - | - | |
| H | 11 | - | - | |
| H | 12 | - | - |
| León | Fitting Locations | No. 805 / 38 |
| Connector | Pin | Terminal | Equipment H | Equipment M |
| I | 1 | Supply (75a) input | x | x |
| I | 2 | Supply (75x) output | x | x |
| J | 1 | Washer pump supply input | x | x |
| J | 2 | Washer pump motor and rear window wiper motor signal output | x | x |
| J | 3 | signal horn | x | x |
| J | 4 | Washer pump motor and rear window wiper motor signal output | x | x |
| J | 5 | Washer pump earth (31) | x | x |
| J | 6 | Horn signal output | x | x |
| K | 1 | Heated rear window signal output | x | x |
| K | 2 | - | - | |
| K | 3 | - | - | |
| K | 4 | - | - | |
| K | 5 | Supply input (30G) | x | x |
| K | 6 | Heated rear window supply input | x | x |
| K | 7 | - | - | |
| K | 8 | - | - | |
| K | 9 | - | - | |
| K | 10 | Supply output (30G) | x | x |
| L | 1 | Interior supply input (15) | x | x |
| L | 2 | Interior supply output (15) | x | x |
| León | Fitting Locations | No. 805 / 39 |
