comma.ai — make driving chill

Shipping

Free US shipping, $30 flat rate internationally.

Compatibility

Harness compatibility based on the US car market.

Note

Does not include the right angle OBD-C cable, sold separately.

Description

The car harness is our universal interface to your car. Use the car harness to connect your comma device to your vehicle.

We designed it to be invisible in your car while being easy to install and use. Car harness enables ECU fingerprinting and seamlessly switches back to the stock system when unplugging your comma device.

Highlights

Stealth install; car parts remain in place, no messy cables
Easy to set up; watch us do it in 3 minutes here
Advanced relay technology prevents faults and warning lights when unplugging your comma device

What's in the box?

Each vehicle has a specific harness based on make, model and year. Each kit includes the following:

1 harness box
1 harness connector
1 comma power v2
1 RJ45 cable (7 ft)

Exceptions to the above include:

1 harness box
1 harness connector

OBD II

1 OBD II harness connector
1 long OBD-C cable (9.5 ft)
1 USB-C coupler

J533

1 harness box
1 harness connector
1 long OBD-C cable (9.5 ft)
1 USB-C coupler

Nissan

1 harness box
1 harness connector
1 comma power v2
1 RJ45 cable (7 ft)
1 long OBD-C cable (9.5 ft)
1 USB-C coupler

Developer Notes

Auto shutoff to protect your car battery
Easy to develop new car ports; just make a new connector
OBD-C is the standard port for comma hardware
For harness without a connector on the car side, choose "Developer Harness"