L→R USB3 ··· J1
CDCU 7912120 · plug face
Facing the plugs (same as drawing V1.1): USB3 left → J1 power right.
Yaxon: measure J1 pins 17 + 20 vs 19. Skip 18.
| Pin | Name | What it is |
|---|---|---|
| 20 | BAT+ | KL30 constant 24V / 15A — main feed |
| 17 | IG1+ | KL15 ignition 24V / <1A — wake |
| 19 | GND | Power ground 15A |
| 18 | DOOR | Door hardwire — not power |
Key ON: 20→19 ≈ battery V; 17→19 ≈ 24V. Key OFF: 17 ≈ 0V, 20 still live. Type-C is a USB host port (feeds front USB box 3725220), not a PC adb port.