At least on the Gen 3 650s (2017+), you can use a 6 pin Suzuki to OBD adapter cable, and then use a standard OBDII adapter. I've got a cheapy bluetooth ELM327 clone under the seat. Clearing codes works, but you seem to need the ignition on, some need engine running, and some need the engine started then stopped to clear.
To perform ABS service functions and other things, you need the Suzuki Diagnostic System II. I did try with a cheap vehicle interface but had no joy.