ScreenTune USB Prompt Does Not Appear
Work through these checks in order, retrying the USB after each one. Nothing on the car changes while the SCREENTUNE prompt is missing.
| Check | What to do |
|---|---|
| Drive layout | Open the USB on a computer. jci-autoupdate, START_HERE.html, screentune-agent, config.cbor, and the .up file must sit at the top level. A ZIP or a ScreenTune-<version> folder on the drive will not start. Fix the layout. |
| Format | One FAT32 partition on an MBR partition table, on an 8–32 GB drive. exFAT, NTFS, and GPT do not work. |
| Mac hidden files | macOS writes ._* and .DS_Store files to FAT32 drives, and a ._*.up file can confuse the car’s update scanner. Run the clean-and-eject command on the Mac. |
| Timing | Insert the drive only after the normal home, Applications, or Settings screen appears. If you inserted it during startup, remove it, wait for the home screen, and insert it again. |
| Power | Start the engine or turn the ignition fully on, and keep it on for a few uninterrupted minutes. |
| Port | Plug directly into a media USB port: no hub, splitter, extension cable, or charge-only port. Then try the car’s other media port. |
| One ScreenTune drive | The car uses the first USB port that holds a ScreenTune drive. Leave only one ScreenTune USB plugged in, and unplug music drives while you test. |
No screentune.log means a firmware or package problem
Section titled “No screentune.log means a firmware or package problem”After a correctly prepared drive sat in the car with the home screen up, open it on a
computer. A run that reached the prompt leaves screentune.log and a logs folder at the
top level. No screentune.log means ScreenTune stopped before its first step, which has two
causes:
- Unsupported firmware. The installer requires v74.00.324 (
74.00.324Ain North America, or74.00.324with a region code such asEU Nor4A Nelsewhere). Open Settings → System → About (where to look). A different version means unsupported firmware. - A damaged or altered package. A renamed, edited, partly copied, or mixed-in file fails the same check. Format the drive and copy a fresh download from My ScreenTune downloads.
Both stop before any change, so the car is as it was.
Music drives fail too: check the port
Section titled “Music drives fail too: check the port”If a music drive also fails in the same port, the problem is the port or the car’s USB hardware. See USB not working.
Still no prompt: contact support
Section titled “Still no prompt: contact support”Contact support with your order email, a photo of Settings → System → About, a description of what the screen did, and the contents of the USB as a ZIP, even if it has no log.