Who this is for
Confident owners whose car needs a harness version that comma does not sell yet.
comma fourcomma 3X
sunnypilotHardware and wiringAdvanced
Flip wire pairs on a Hyundai or Kia harness
You re-pin the comma harness only, never the car's own wiring, following the diagram for your connector.
This is a live community thread The work is still moving. Read the newest posts before you follow older steps.
You need
- The closest comma harness for your connector
- A pin removal tool and steady hands
- The wiring diagram for your car from the thread
In plain words
Why this guide matters
Some Hyundai, Kia and Genesis cars fit a comma harness physically but have the wires in a different order, so nothing works. This sunnypilot guide shows how to move pins on the comma harness so steering messages reach the right place. It is the only route today for cars whose harness letter, like S or T, is not sold yet.
The short version
What the full guide walks you through
Confirm with the harness guide that your version really does not exist.
Open the connector lock on the comma harness and lift the listed pins.
Move each pair to its new position exactly as the diagram shows.
Re-lock the connector and check every pin is seated.
Test in the car and share a route if it does not work.
Before you start
- Never cut or move the car's factory wiring.
- Written for developers and testers; you carry the risk.
- A bad flip can leave the car in dashcam mode or throw dash faults.
The full community thread belongs to sunnypilot. Checked on September 10, 2026. Their last update was January 9, 2026.
Quick answers
Questions people ask
Do I flip wires on the car or the harness?
Only on the comma add-on harness, never on the car's factory wiring. The guide is firm on this.
How do I know a flip is needed?
The harness finder or connector photos tell you if your letter does not exist. Developers confirm it by checking where the steering messages appear in the logs.
What tools do I need?
A pin removal tool or a thin stiff pick, good light and patience. Re-lock the connector and check every pin before plugging in.
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 sunnypilot. CommaGuide is an independent guide and is not affiliated with comma.ai or sunnypilot.
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