Who this is for
Rivian owners installing a comma four or 3X for the first time.
comma fourcomma 3X
xnor wikiInstall softwareSome effort
Install a comma device in a Rivian R1S or R1T
Put the truck fully to sleep, plug the harness into the module behind the passenger footwell, then install stock openpilot first.
You need
- A comma four or 3X with the Rivian harness
- Torx T20, flathead, trim tool and a 13 mm deep socket
- Fifteen to twenty minutes for the truck to fall asleep
What the full guide walks you through
Plugging a comma harness into an awake Rivian has switched off Driver+ for several owners. This guide shows how to put the R1S or R1T to sleep, reach the footwell module and fit the harness. It then tells you to install stock openpilot first, before trying sunnypilot for speed control.
Turn off Gear Guard, lock the truck with a door ajar and walk away.
Remove the passenger footwell panel to reach the module.
Pull the white connector and slide the comma harness in.
Wake the truck, connect the device and install stock openpilot.
Switch to sunnypilot later if you want speed control.
Before you start
- Plugging in while awake has switched off Driver+ for some owners.
- The 3X needs the 8-degree mount; the comma four works better with it too.
The full written guide belongs to xnor wiki. Checked on September 10, 2026.
Towing and long drives in your R1T
Yes, comma works while towing with the right setup. It’s an amazing upgrade for long highway drives.
Stay especially vigilant and ready to steer or brake. You remain responsible for your truck and trailer.
Match your truck’s year, equipment and software before buying. Confirm your trailer setup with the software project and follow your vehicle’s towing instructions.
Questions people ask
How do I put the Rivian to sleep?
Turn off Gear Guard, lock it with a door ajar, switch off your phone's Bluetooth and walk away for 15 to 20 minutes.
Which tools do I need?
A Torx T20, a flathead, a plastic trim tool, a 13 mm deep socket and a good light.
Do I need the 8-degree mount?
The comma 3X requires it. The comma four works without it but the guide says it performs better with it.
Check your car
Cars this guide talks about
Support changes by year and trim. Open your exact car before you buy anything.
Related
More guides like this
All community guidesNot sure this is your path?
Check your exact car first, then choose software and hardware.
Photos: comma.ai. Guide content belongs to xnor wiki. CommaGuide is an independent guide and is not affiliated with comma.ai or xnor wiki.
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