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There were multiple things wrong: 1. I plugged in the Lukas long harness to my computer via USB-C and confirmed the LEDs light up. The long harness receives power from the USB-C port. This confirmed there was nothing wrong with the harness. 2. When connecting the Lukas long harness directly to...

I got it working!

I tried it with the 2 separate usb-c cables going to the Comma 4 and no luck. I still don't see any LEDs turned on on the long harness box.

Yes, that is the Janquick mount I have, specifically the Comma 4 version. Mine didn't come with the "data blocker" plug. According to the "update" tab, it seems to be included with a newer version of the mount?

I don't see the option to enable Alpha Longitudinal in the Developer settings menu on the Comma 4. Is it because Sunnypilot is not detecting the long harness?

Adding one more photo to show connection to vehicle side

Are you referring to the short USB-C cable in the photo labeled in yellow "Lukas Long"? If so, I tried reversing it from both sides (one side at a time) and no luck. Still no LED on the box.

Thanks for the reply. Which USB-C connection?

Hello all, I have a new Comma 4 with the Comma Rivian harness. I also bought and installed the Lukas longitudinal harness and the Janquick Quick Release Mount. After installing Sunnypilot, I'm able to get Openpilot lateral working. But I'm not able to get longitudinal working, similar to...