Getting Started: Common Questions & Answers

Hello,
mein Interface ist heute gekommen Bevor ich ans Auto gehe, habe ich mich auf meinen Schreibtischdiagnoseplatz gestürzt. The following components are installed:
Gateway, speedometer, body control module, steering column control unit, and radio.

I immediately plugged the interface into the OBD socket, but as expected, nothing happened. I had already read in the forum that you should tap directly into the bus. Now, with the interface connected to the comfort bus at a speed of 100 kbps, I'm listening to the CAN traffic.

I wanted to check the speedometer, so I used the "Send & Replay" function for that purpose.

Okay, so if I now send 0x2C3 with message 07 for the ignition key on signal, the dashboard lights briefly illuminate. Alright, you have to send it cyclically, so...

Periodic, set with a period of 100ms and a delay of 0ms.

If I send this now, the speedometer flashes erratically. Sometimes it cuts out the ignition, and then the flashing starts again. What's the solution to achieve a stable ignition signal when sending data? I also recorded something once, and when I play it back, it only plays with stuttering. What can I do about that?

Thank you for the beginner's help .

Hi,

If a message with a specific status is already present on the bus, you cannot simply overwrite it.
Because then both states alternate, which explains the behavior of the meter.

You can either modify the signal using a diagnostic protocol and actuator diagnosis ("actuation commands"), or remove the message from the bus by disconnecting the generating control unit or installing a gateway.

Best regards, Rainer.

Thank you for the tip about sending the old state as well; I hadn't even thought of that .

I disconnected the body control module, and now it stays on .