Re: Something doesn't fly right with this story
Radio links, GPS, accelerometers and compasses all work just fine in the rain . . .
3 posts • joined 4 Jul 2018
Oh dear . . .
You do realise that there are 6+ CAN busses in a modern vehicle ? and that they are not directly connected together . . . ?
You do realise that the CAN bus connected to the infotainment system is not the same one connected to the ODBII port, or the drivetrain bus, or the body control bus, or, or . . .
You do realise that there is a CAN (and other bus technologies, LIN, Flexray) bus router between the ODBII port and the internal CAN busses ?
Do you understand anything real about actual vehicle electronics architectures ? . . .
Very likely the telematics unit is connected via an IP/Ethernet network these days, probably to the vehicle central gateway . . . BroadR Reach ethernet being the current ethernet trend . . . all you need is a relatively cheap media converter to convert to 10/100 classical ethernet and it plugs into your laptop for wiresharking . . .
Modern vehicles have (will soon have) an ethernet switch onboard, a port of which is usually presented on the ODBII connector for manufacturing software download and dealer software update and diagnostics. Almost nobody actually uses CAN on the diagnostics connector any more for anything serious - it's too slow . . . but it is supported and legally mandated for emissions control diagnostics so that Oily Dave at the garage can tell you what's wrong with your car without access to dealer diagnostics kit . . .
There's a lot of change going on in the automotive industry at the moment in terms on onboard networking technologies, the security side of which leaves a lot to be desired . . . not that the existing technology set didn't also have its problems too . . .
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