Who this is for
New comma four owners doing their first install.
comma four
comma.aiInstall softwareEasy
How to set up a comma four in your car
Pop the mirror trim, plug the harness into the camera, stick the mount high and centred, connect the cable, replace the trim.
You need
- A comma four with its cable and mounts
- The car harness for your car
- The alcohol wipe from the box
In plain words
Why this guide matters
Fitting a comma four is the first job every new owner faces, and most cars take about fifteen minutes. This official comma guide walks through removing the mirror trim, plugging in the harness and sticking the mount straight. Pick your car in the page and you get install notes written for that exact model.
The short version
What the full guide walks you through
Remove the trim around the rear-view mirror.
Plug the harness between the camera and its factory connector.
Clean the glass and stick the mount high and centred.
Connect the cable and seat the device in the mount.
Refit the trim and optionally pair with comma connect.
Before you start
- An off-centre mount will not centre the car in the lane.
- Pick your car in the page to see model-specific notes first.
The full written guide belongs to comma.ai. Checked on September 10, 2026.
Quick answers
Questions people ask
Do I need any special tools?
Usually no; the trim pops off by hand and the alcohol wipe is in the box. Some cars need a firm tug or a slide, so watch a video for your make first.
Will installing a comma four void my car warranty?
The install makes no permanent changes, and comma cites US law on aftermarket parts. Removing the device leaves the car as it was.
What if the mount is not perfectly centred?
Small errors are corrected during calibration, but a mount far off centre stops the car sitting in the middle of the lane.
Related
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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 comma.ai. CommaGuide is an independent guide and is not affiliated with comma.ai or comma.ai.
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