CAN Bus Communications Decoded: Step 4: Cause a Variable You Are Looking For to Change
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Step 4: Cause a Variable You Are Looking For to Change
01.33
| 00:00 | - So the fourth step of the process is going to be making that physical input into the vehicle and looking for the corresponding output on our datastream that's being displayed here. |
| 00:09 | Now it's steering wheel angle that I'm looking for here so I'm just going to have to pop the steering wheel on the vehicle and turn it and see if I see any of those data bytes on our stream changing there. |
| 00:21 | Got the steering wheel on the vehicle now. |
| 00:23 | I've just had to pop my laptop off to the side because like a lot of racecars, there's not actually much room to work in here so you've sometimes got to be a little bit of a contortionist to get everything in place. |
| 00:32 | But I can now move the steering wheel and we're just watching for corresponding changes on that CAN data stream. |
| 00:37 | So I'm just looking at the byte up the very top there which is PID 010 in hex and as I move the steering wheel I'm really not seeing any data change there. |
| 00:49 | That's the same for 011, 012, 013, 018, 028, 02A. |
| 01:06 | 0D0 is looking very interesting though. |
| 01:10 | So those first 2 data bytes of 0D0 there, I absolutely think we've found it. |
| 01:18 | It's moving directly in response to inputs that I'm making on the steering wheel. |
| 01:24 | So I'm really confident that we have actually tracked down the location of that parameter there. |
