Differences

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--- hardware:tbox_pinout [2026/10/13 16:30] – created - external edit 127.0.0.1
+++ hardware:tbox_pinout [2026/10/13 16:53] (current) – external edit 127.0.0.1
@@ Line 5: / Line 5: @@
 ===== BD49 — main connector (40-way, white) =====
-{{ :tbox_bd49_pinout.png?900 |BD49 TBox main connector, end view}}
+{{ :tbox_bd49_pinout.png?450 |BD49 TBox harness plug, front view}}
-Two rows of 20 pins, numbered **left to right**: top row **1–20**, bottom row **21–40**, latch on top.
+The drawing shows the harness plug from the front.
-<code>
-  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19 20
-22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
-</code>
-**⚠ View direction unconfirmed:** the drawing does not state whether it shows the mating face or the wire side. Check left/right with a continuity test before relying on it.
 ^ Pin ^ Wire (mm²) ^ Colour ^ Function ^
@@ Line 38: / 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 =====
+{{ :tbox_bd48_usb.png?200 |BD48, TBox side}} {{ :hu_bd55_usb.png?200 |BD55, head unit side}}
-^ Pin ^ Function ^
+^ Signal ^ BD48 (TBox) ^ BD55 (head unit) ^
-| 1 | USB D− |
+| USB D− | 1 | 4 |
-| 2 | Ground |
+| Ground | 2 | 3 |
-| 3 | USB D+ |
+| USB D+ | 3 | 2 |
+| not connected | — | 1 |
-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.
+There is no +5 V on this link; the TBox is powered through BD49. Ring the pins out before making a cable.