Since you have pcan interface, you can try to record what the pcan interface is seeing on the bus.
In short:
1. connect and start the pcan view software,
2. press the red button for recording
3. try to start the car
4. wait 30 seconds
5. switch off the car
6. stop the recording by pressing the square button
7. press on the "trace" tab
8. use the menu to save the trace file