Look at what I found printed on the bottom of my LiveWire’s display unit:


Two immediately interesting bits of information there – a Harley-Davidson part number (70900801) and an FCC ID (SQGBT850).

A bit of quick googling finds 70900801 is “INSTR,CLSTR,DIGITAL” (Instrument, Cluster, Digital). There’s even one on eBay right now. Google also turns up this NHTSA copy of a LiveWire Service Bulletin from late 2019  – which dumps a few acronyms (as an engineer, I love acronyms) on us, including “IM” (Instrument Module) as the proper name for the display unit.

But it’s that second bit of information printed on the Instrument Model - the FCC ID - that’s more useful to me however for figuring out the Bluetooth flaws. (I was surprised I could NOT find this in the motorcycle’s manual, btw.)

Knowing that FCC ID (we’re doing something similar at work btw - using FCC IDs to look at the reports for various Bluetooth devices we are working with) leads me to this: Laird Connectivity Bluetooth 4.2 Dual Mode USB HCI Module, Bluetooth 4.2 Dual Mode UART HCI Module BT850 – the Bluetooth module at the heart of the LiveWire Instrument Module.

And that page has user manuals for that module that should help me as I debug further. Stay tuned!

You can find Part 1 here and Part 2 here, btw.