CAN & USB

CAN 1

• CAN H: B17. CAN L: B16.
• Twisted pair, automotive CAN cable. Not two random wires from the scrap bin.
• 120 Ω between H and L at each end of the bus — typically inside the ECU (check whether your Race Core build has the on-board terminator populated) and inside the dash or TCM. A three-node bus still only wants two terminators.
• A mid-bus wideband controller should not add a third 120 Ω.

Common nodes: Race Core dash, CAN wideband (AEM, rusEFI, Realdash-facing controllers), OEM body/dash CAN (BMW, VAG, 350Z and similar), steering-angle / ABS if you are doing traction from OEM CAN.

CAN 2

• CAN 2 H: B22. CAN 2 L: B21.
• Same rules: twisted pair, 120 Ω at each end of that bus. Do not share termination with CAN 1.

USB-C

• Serial is the USB-C port on the ABS enclosure. Data cable. Charge-only cables enumerate nothing.
• USB is not on Connector B. Do not put D+ / D− into AMPSEAL cavities.
• If the connection drops every time the charger is plugged into the laptop, that is a ground loop. Tune on battery, or isolate.