Who this is for
Ioniq 9 owners who are comfortable re-pinning a harness and running test software.
comma four
sunnypilotInstall softwareAdvanced
Install a comma four on a Hyundai Ioniq 9
Yes, with a comma four, a Hyundai M harness with eight wires flipped, and the angle-steering test branch.
This is a live community thread The work is still moving. Read the newest posts before you follow older steps.
You need
- A comma four and a Hyundai M harness
- A pin tool to flip eight wires on the harness
- The angle-steering branch install link
In plain words
Why this guide matters
The Hyundai Ioniq 9 is not on comma's list, but one owner got a comma four working with sunnypilot. The write-up covers the Hyundai M harness with eight wires flipped, the angle-steering branch and the in-car fitting. It is a single owner's method on test software, so read it as a starting point, not a guarantee.
The short version
What the full guide walks you through
Flip the eight wires on the M harness as the wire-flip guide shows.
Set up the comma four at home on Wi-Fi with the branch URL.
Pair sunnylink and set the car to Ioniq 9 in settings.
Remove the mirror housing, fit the harness and mount the device centred.
Route the cable and test the drive.
Before you start
- A single owner's method, not an official guide.
- The branch is unfinished and updates often.
- Never touch the car's own wiring, only the comma harness.
The full community thread belongs to sunnypilot. Checked on September 10, 2026. Their last update was July 23, 2026.
Quick answers
Questions people ask
Do I need a comma four for the Ioniq 9?
Yes; the angle-steering thread lists the comma four as the supported device. The write-up used one.
Which harness does the Ioniq 9 need?
Hyundai S, which is not sold, so you buy Hyundai M and flip eight wires on the comma harness.
Is this safe to do myself?
Only if you are comfortable re-pinning a harness and running unfinished software. The author warns to do it at your own risk.
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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