[jon-wood]

It can if you have actually isolated busses feeding into what I will, for lack of knowledge of a better term, a CAN router. Maybe it exists, but I'm imagining a device with multiple CAN inputs that makes decisions on what messages to pass on to other busses.

[TheLoafOfBread]

That what gateway is doing and that's the reason why they are going for headlights (which are sharing bus with immobilizer I suppose) and won't go for door locks or TPMS.

[closeparen]

>which are sharing bus with immobilizer I suppose

I think the proposal is to, uh, not do that.