Pinout Card
The Wall Poster — Driver Side.
The C304 / C126 tower plug, holographic blueprint style. Prints in full color, landscape letter — the dark plate is the point. Toolbox-lid approved.
D15B Detail Hub — Garage Poster Nº 002
Honda OBD-1 ECU Connector Reference
Driver Side — C304 / C126 · 14-pin round
IACV · VSS · purge · fan switch · grounds — the chassis handshake
Hank approved
verified at the bench
verified at the bench
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14
Terminal view · harness side · locking tab up · pin 1 top-left
| Pin | Wire | Signal | Goes to | Expect |
|---|---|---|---|---|
| 1 | BLK/YEL | Alternator feed | Alternator → dash fuse | — |
| 2 | WHT/BLU | Battery warning light | Gauge cluster ↔ alternator | — |
| 3 | RED | PCS purge control | ECU A20 | Duty-controlled when on |
| 4 | GRN/WHT | IACV | ECU A9 | Idle: 6–10V |
| 5 | BLK/YEL | IG1 (key) | Dash fuse 24 → VSS · main relay · ELD | — |
| 6 | YEL/BLU | VSS | ECU B10 | Wheels turning: 0–5V cycles |
| 7 | — | Empty cavity (not used on the EG) | — | — |
| 8 | YEL/RED | Oil-pressure warning light | Gauge cluster → oil pressure switch | — |
| 9 | YEL/GRN | FANC | ECU A12 | Fan running: 0V |
| 10 | BLK | PG2 power ground | ECU A23 | < 1V at all times |
| 11 | YEL/GRN | Coolant temp sending unit | Gauge cluster | — |
| 12 | YEL | VTM diff-lock control (auto 4AT only) | Differential lock solenoid | — |
| 13 | BLU | VTSW diff-lock switch (auto 4AT only) | Differential lock switch | — |
| 14 | BLU/YEL | VSS B (auto 4AT only) | Transmission speed pickup | — |
BLKYELWHTBLUREDGRN
Verify against the chart before depinning · revision differences exist · d15b-detail-hub
Posters print in full color, landscape letter — the dark plate is the point. The pinout card stays ink-friendly.