====== TBox connector pinout ======

Pin assignment of the Aiways U5 **TBox** (Telematics Box) connectors. Teardown and chip list: [[hardware:tbox|TBox teardown]].

===== BD49 — main connector (40-way, white) =====

{{ :tbox_bd49_pinout.png?450 |BD49 TBox harness plug, front view}}

The drawing shows the harness plug from the front.

^ Pin ^ Wire (mm²) ^ Colour ^ Function ^
| 1  | 0.35 | G/L  | **Ignition (IGN)** |
| 5  | 0.5  | Y    | Microphone 2 − |
| 6  | 0.5  | L    | Microphone in + |
| 8  | 0.5  | L    | Audio input + |
| 10 | 0.35 | O/R  | E-Call/B-Call indicator lamp ground |
| 11 | 0.5  | Br/R | Collision signal input (airbag) |
| 19 | 0.5  | Gr/R | **CAN-H** |
| 20 | 0.5  | W/Y  | **Battery + (permanent 12 V)** |
| 25 | 0.5  | B/R  | Microphone 2 + |
| 26 | 0.5  | V    | Microphone in − |
| 28 | 0.5  | V    | Audio input − |
| 30 | 0.34 | R/W  | E-Call/B-Call indicator lamp power |
| 33 | 0.35 | Br/R | B-Call indicator lamp output |
| 34 | 0.35 | Y/R  | E-Call indicator lamp output |
| 39 | 0.5  | Gr/L | **CAN-L** |
| 40 | 0.5  | B    | **Ground** |

All other positions are empty.

**Bench operation** needs only pin 20 (12 V), 40 (ground), 1 (ignition) and 19/39 (CAN). Everything else is for eCall/bCall: two microphone pairs, an audio input, the crash signal and the indicator lamps. There is **no USB, Ethernet or debug UART** on this connector.

===== BD48 / BD55 — USB link to the head unit =====

{{ :tbox_bd48_usb.png?200 |BD48, TBox side}} {{ :hu_bd55_usb.png?200 |BD55, head unit side}}

^ Signal ^ BD48 (TBox) ^ BD55 (head unit) ^
| USB D− | 1 | 4 |
| Ground | 2 | 3 |
| USB D+ | 3 | 2 |
| not connected | — | 1 |

There is no +5 V on this link; the TBox is powered through BD49. Ring the pins out before making a cable.