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They won't. You need the service manual ... https://650f.bike/resources/2021-2022-service-manual-credit-to-jfv.45/ J

Wiring diagram in the back of the service manual will be the document to read for that info. I'm not near my copy at the moment. J

Relays are under the tank. Service manual will show you how to get there. J

It's the abs unit, it's a sod. I've had luck by putting a syringe on the bleed nipple and sucking rather than pushing the fluid. Also, push fluid backwards too... Sometimes that helps move the air pocket. J

I'd say re read the process again. I've never done it but it took me multiple read throughs before it really made sense.

You don't. I've changed the brake fluid several times on my abs 650f without issue. Abs units can be a pig to bleed if you get air in them though. J

I suggest starting a separate thread on the sbject.

@JH09 same mil code?

On a 24 or 25 year bike, take it back to Honda under warranty. J

That's the attitude! J

Sounds like the switch itself might be corroded and/or stuck. Could try copious amounts of wd40 to see if it frees off? J

I think it's a 6mm or 8mm hex. It's been a while since I removed a rearset. That said, the adjuster nut on the switch is nylon ... it's unlikely to be really stuck. Just grip the switch body with one hand and turn the nut with the other. J

Edited the link back so it's clickable again J

Thanks and welcome. Try posting the link as a reply to this, we have the spam filtering set to "red alert" at the moment, so it can be a little trigger happy. J

Wires get vibrated a lot on bike. Connectors even more so. Good luck!

It's been a minute since I looked at the wiring diagram, but if it were me... I'd check the ecu was getting a good signal from the vss, and then follow your thoughts of checking ecu to dash. When testing are you giving the wires a good shake/vibrate them? J

Hi. Have you traced the vss signal all the way to the ecu under the tank? The signal goes to the ecu, and then onwards to the dash from there. J

If you have air in the ABS unit, it can be a PITA to get out. At least the rear has shorter lines. Another vote for doing it "the old way". J

They do help. Especially if you're replacing older oem lines. Ebc hh pads really do change the rear brake profile though. It actually can slow the bike. J

Ironically, the answer is here https://650f.bike/threads/cbr650r-2021-speed-sensor-location.6276/ J