Wiring Diagram VW TRANSPORTER 2017 - Trailer detector control unit - Fuse 4 in fuse holder H - Fuse 5 in fuse holder H - Fuse 6 in fuse holder H - Fuse 15 in fuse holder H - Fuse 30 on fuse holder C
| A1 | Second battery |
| J345 | Trailer detector control unit |
| SH4 | Fuse 4 in fuse holder H |
| SH5 | Fuse 5 in fuse holder H |
| SH6 | Fuse 6 in fuse holder H |
| SA8 | Fuse 8 in fuse holder A |
| SH15 | Fuse 15 in fuse holder H |
| SC30 | Fuse 30 on fuse holder C |
| T12ac | 12-pin connector, red |
| B169 | Positive connection 1 (30), in interior wiring harness |
| B170 | Positive connection 2 (30), in interior wiring harness |
| B278 | Positive connection 2 (15a) in main wiring harness |
| B299 | Positive connection 3 (30), in main wiring harness |
| B331 | Positive connection 17 (30a) in main wiring harness |
| * | Only models with second battery |
| *2 | Only models with no second battery |
Wiring Diagram VW TRANSPORTER 2017 - Trailer detector control unit - Trailer socket
| J345 | Trailer detector control unit |
| J941 | Trailer voltage supply relay |
| T12ac | 12-pin connector, red |
| T13 | 13-pin connector, black |
| T16n | 16-pin connector, black |
| T17f | 17-pin connector, brown, under driver seat |
| U10 | Trailer socket |
| 68 | Earth point, on left of rear cross member |
| 86 | Earth connection 1, in rear wiring harness |
| 366 | Earth connection 1, in main wiring harness |
| 387 | Earth connection 22, in main wiring harness |
| 636 | Earth point, onboard supply control unit |
Wiring Diagram VW TRANSPORTER 2017 - Trailer detector control unit - Onboard supply control unit - Trailer socket
| J345 | Trailer detector control unit |
| J519 | Onboard supply control unit |
| T12ac | 12-pin connector, red |
| T13 | 13-pin connector, black |
| T16n | 16-pin connector, black |
| T17f | 17-pin connector, brown, under driver seat |
| T17n | 17-pin connector, light green, under driver seat |
| T73b | 73-pin connector, white |
| U10 | Trailer socket |
| 86 | Earth connection 1, in rear wiring harness |
| B397 | Connection 1 (convenience CAN bus, high), in main wiring harness |
| B406 | Connection 1 (convenience CAN bus, low), in main wiring harness |
Wiring Diagram VW TRANSPORTER 2017 - Brake light switch - Reversing light switch - Onboard supply control unit - Left tail light
| F | Brake light switch |
| F4 | Reversing light switch |
| J519 | Onboard supply control unit |
| J623 | Engine control unit |
| L46 | Rear left fog light bulb |
| MX3 | Left tail light |
| M4 | Left tail light bulb |
| M6 | Rear left turn signal bulb |
| M9 | Left brake light bulb |
| M16 | Left reversing light bulb |
| T10 | 10-pin connector, black, in E-box in engine compartment |
| T10a | 10-pin connector, brown, in E-box in engine compartment |
| T17n | 17-pin connector, light green, under driver seat |
| T73a | 73-pin connector, black |
| T73b | 73-pin connector, white |
| 86 | Earth connection 1, in rear wiring harness |
| B131 | Connection (54), in interior wiring harness |
| B144 | Positive connection (58L), in interior wiring harness |
| B152 | Connection (LTS), in interior wiring harness |
| B520 | Connection (RL), in main wiring harness |
| W71 | Connection (reversing light), in rear wiring harness |
| * | see applicable current flow diagram for engine |
| *2 | Only models with rear fog light |
| *3 | Only left-hand drive models |
| *4 | Only models with no electric interface |
| *5 | Only models with manual gearbox |
Wiring Diagram VW TRANSPORTER 2017 - Onboard supply control unit - Right tail light - Left number plate light - Right number plate light
| J519 | Onboard supply control unit |
| L47 | Rear right fog light bulb |
| M2 | Right tail light bulb |
| MX2 | Front right headlight |
| MX4 | Right tail light |
| M8 | Rear right turn signal bulb |
| M10 | Right brake light bulb |
| M17 | Right reversing light bulb |
| T17f | 17-pin connector, brown, under driver seat |
| T17n | 17-pin connector, light green, under driver seat |
| T73a | 73-pin connector, black |
| T73b | 73-pin connector, white |
| X4 | Left number plate light |
| X5 | Right number plate light |
| 86 | Earth connection 1, in rear wiring harness |
| B153 | Connection (RTS), in interior wiring harness |
| B642 | Positive connection (58), in main wiring harness |
| * | see applicable current flow diagram for headlights |
| *2 | Only models with H4 headlights |
| *3 | Only models with H7 headlights |
| *4 | Only models with ambient lighting, version 1 |
| *5 | Only models with rear fog light |
| *6 | Only right-hand drive models |
| *7 | Only models with ambient lighting, version 2 |
Wiring Diagram VW TRANSPORTER 2017 - Light switch - Hazard warning light switch - Rear fog light switch - Front and rear fog light switch - Steering column combination switch - Onboard supply control unit - Indicator lamp for hazard warning light - Fuse 3 on fuse holder C - Fuse 5 on fuse holder C - Fuse 41 on fuse holder C - Fuse 47 on fuse holder C
| E1 | Light switch |
| E3 | Hazard warning light switch |
| E18 | Rear fog light switch |
| E23 | Front and rear fog light switch |
| E595 | Steering column combination switch |
| J519 | Onboard supply control unit |
| K6 | Indicator lamp for hazard warning light |
| SC3 | Fuse 3 on fuse holder C |
| SC5 | Fuse 5 on fuse holder C |
| SC41 | Fuse 41 on fuse holder C |
| SC47 | Fuse 47 on fuse holder C |
| T10bb | 10-pin connector, black |
| T41 | 41-pin connector, grey |
| T73a | 73-pin connector, black |
| T73b | 73-pin connector, white |
| * | see applicable current flow diagram for headlights |
| *2 | Only models with fog lights |
| *3 | Only models with rear fog light |
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