Differences

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--- hardware:tbox_pinout [2026/10/13 16:39] – external edit 127.0.0.1
+++ hardware:tbox_pinout [2026/10/13 16:53] (current) – external edit 127.0.0.1
@@ Line 7: / Line 7: @@
 {{ :tbox_bd49_pinout.png?450 |BD49 TBox harness plug, front view}}
-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.
+The drawing shows the harness plug from the front.
 ^ Pin ^ Wire (mm²) ^ Colour ^ Function ^
@@ Line 31: / Line 31: @@
 **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 =====
+===== BD48 / BD55 — USB link to the head unit =====
-^ Pin ^ Function ^
+{{ :tbox_bd48_usb.png?200 |BD48, TBox side}} {{ :hu_bd55_usb.png?200 |BD55, head unit side}}
-| 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.
+^ 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.