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setup guide

step 1
turn off your car
turn off your car
Ensure your vehicle is powered off before taking any additional steps.
step 2
remove the rearview mirror cover trim remove the rearview mirror cover trim remove the rearview mirror cover trim remove the rearview mirror cover trim
remove the rearview mirror cover trim
Removal method varies by car. Car trim plastics are often held in place by a mix of clips and hooks, some may require a firm tug to release. Angling the mirror out of the way is recommended. If you'd like to see how it's done, find a comma installation guide for your specific make on YouTube.

This is the hardest part, so take your time!
remove the rearview mirror cover trim remove the rearview mirror cover trim remove the rearview mirror cover trim
step 3
unplug the car's camera cable unplug the car's camera cable unplug the car's camera cable
unplug the car's camera cable
Each vehicle's connector is slightly different, but all of them are held in place with a clip on the plug. If you feel like the cable isn't easy to pull out, make sure to press down all the way and hold to release the clip while pulling the connector out.
unplug the car's camera cable unplug the car's camera cable
step 4
plug the comma harness into the camera port
plug the comma harness into the camera port
Plugs only fit in one way! If you feel unexpected resistance, check to see if you are plugging in the right orientation.
step 5
plug the car’s camera wires into the other end of the harness box
plug the car’s camera wires into the other end of the harness box
The other end of the harness box has a corresponding connector for your car to plug into, make sure you hear a click when you plug each wire in. This completes the connection between the car camera and the harness box
step 6
plug the OBD-C cable into the harness box
plug the OBD-C cable into the harness box
Some car kits include a long OBD-C cable for easier wire routing. Either end can be plugged in, however it is not recommended to use a non-official comma cable or plug a non-comma device into the harness box.
step 7
plug the comma power into the harness box
plug the comma power into the harness box
The comma power allows your comma four to stay powered on if the car is off. This means no boot up time before each drive, and automatic software updates in the background. It is optional for driving functionality, but recommended.
step 8
connect the comma power to your car connect the comma power to your car
connect the comma power to your car
The comma power plugs into your car’s OBD port, usually found in the driver footwell. It includes a thin and flexible cable to make it easy to push underneath trim and liner without first detaching those from your car.
connect the comma power to your car
step 9
re-attach the rearview mirror cover trim
re-attach the rearview mirror cover trim
Attach the cover plastic the same way you removed it, just backwards. You can route the OBD-C cable however you like, but leave some slack to make it easier to plug into your comma four next. Some of our cars have the cable wrapped around the mirror arm while others are routed through the trim; clean or messy, it's up to you :)
step 10
attach a mount to your comma four attach a mount to your comma four
attach a mount to your comma four
Use two thumbs to press the sides down and push up. It should slide on easily with a tight fit.
attach a mount to your comma four
step 11
plug in your comma four
plug in your comma four
Do not peel off the red tape protector until you're ready to mount after the next step.
step 12
find a good spot for your comma four find a good spot for your comma four
find a good spot for your comma four
The comma four must be mounted in the center of the windshield and high up. Hold it up to see how it fits with your car's trim.

Make sure the spot you like leaves enough room above the comma four to make it easy to unplug!
find a good spot for your comma four
step 13
stick your comma four to the windshield
stick your comma four to the windshield
When you're happy with the position, peel the red layer off the mount, and stick your comma four in place. Firmly press it upward to properly stick the mount to the windshield.
step 14
unplug your comma four and remove it from the mount unplug your comma four and remove it from the mount
unplug your comma four and remove it from the mount
Slide your comma four up towards your rearview mirror to unmount it.
unplug your comma four and remove it from the mount
step 15
check your mount alignment
check your mount alignment
It's easiest to check your mount's alignment from outside of your car. You want to make sure its centered and level. We recommend doing this before the next step.
step 16
press your mount on press your mount on
press your mount on
Firmly press up on your mount to fully attach the tape. Check for air bubbles from the outside to see which spots need more pressure.
press your mount on
step 17
re-place your comma four
re-place your comma four
Slide your comma four back on to the mount and plug it in. Almost done, last step is cleanup.
step 18
tidy up the wires tidy up the wires tidy up the wires
tidy up the wires
The included cable ties can be helpful for wire management, and the harness box has an additional sticky pad if you have room to mount it underneath the trim (some cars are a tight fit, and others have lots of space).

We find it's usually easy to gently stuff the wires under the trim when everything's attached.
tidy up the wires tidy up the wires
step 19
start and set up your comma four
start and set up your comma four
You just upgraded your car to a whole new experience. Now you can setup your comma four in a few seconds and go for a drive!

Frequently asked questions

Frequently asked questions banner
No. comma prime is completely optional and is not needed for any core functionality. comma prime can be activated, cancelled, and re-activated at any time.
Installing a comma device does not require any permanent modifications to your car. Removing the comma device leaves your car in the same state as before the installation.

We recommend the mount be centered on the windshield below the trim (see pictures in the Installation Guide). Be sure to leave enough room to remove the trim in the future. First, clean the windshield with the included alcohol wipe. Ensure the top of the mount is fully visible from the driver’s seat. Adhere mount: peel off the 3M tape’s cover on the mount. Press firmly in the center of the mount, then the edges to ensure no bubbles form.

Let the mount cure: the mount must cure for 48 hours before installing the comma device. Skipping this step will compromise the integrity of the mount.

The 3X mount may be difficult to slide onto the device before it’s installed on the windshield. This is expected and will be easier to do once the mount is installed and fully cured. Some force may be necessary to initially slide the device on the mount. Before applying any force, ensure the device mount is parallel to the mount on the windshield so it will slide in correctly.

IT IS THE USER’S RESPONSIBILITY TO MOUNT THE DEVICE IN COMPLIANCE WITH ALL APPLICABLE LAWS AND ORDINANCES.

From the FTC website: "Simply using an aftermarket or recycled part does not void your warranty. The Magnuson-Moss Warranty Act makes it illegal for companies to void your warranty or deny coverage under the warranty simply because you used an aftermarket or recycled part."

https://www.consumer.ftc.gov/articles/0138-auto-warranties-routine-maintenance

Contact your insurance provider directly; insurance coverage is between the user and their insurance provider. comma hardware users have been able to get coverage and discuss this on Reddit here.

Insurance companies are beginning to understand the safety benefits of ADAS and LKAS systems like openpilot and we have not heard of any providers rejecting coverage to comma hardware users.