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Table of Contents
TBox connector pinout
Pin assignment of the Aiways U5 TBox (Telematics Box) connectors. Teardown and chip list: TBox teardown.
BD49 — main connector (40-way, white)
The drawing shows the harness plug from the front (its mating face, latch on top). Seen from the back, where the wires enter, the layout is mirrored: pin 1 is then top right.
| 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 — USB link to the head unit
| Pin | Function |
|---|---|
| 1 | USB D− |
| 2 | Ground |
| 3 | USB D+ |
There is no +5 V; the TBox is powered through BD49. The other end is BD55 on the head unit (2 = D+, 3 = GND, 4 = D−, pin 1 not connected). No end-view drawing of BD48 is available — ring the pins out before trusting an orientation.