2016 Mustang meter brightness problem

Hello everyone,
Following the replacement of the Sync2 with a Sync3 on a 2016 Ford Mustang, I’m still adjusting the settings, and I just noticed that I can’t adjust the brightness of the speedometers and rev counters when the headlights are off, i.e., during the day. However, it works correctly when the headlights are on. Perhaps there’s a code to modify in the IPC or APIM?
Thanks.
Frederic.


SYNC Region: EU

Navigation Variant: Nav

Manufacturer Year: Pre MY20

Install Type: OEM Replacement

Old SYNC Version: 3.4.23188

New SYNC Version: 3.4.23188

Do you have a error message, if so what is it?
no

Update Method: CyanLabs Syn3 Updater

Syn3 Updater Version: 3.4.23188

Syn3 Updater Documentation Read: yes

Syn3 Updater Log File

CYANLABS - SYN3 UPDATER - V2.13.3.0
Branch: Stable
Operating System: Microsoft Windows 10 Professionnel (2009)

PREVIOUS CONFIGURATION
Version: 3.4.23188
Region: EU
Navigation: True
Install Mode: Auto-Detect (autoinstall)
Install Mode Overridden: False
My20 Protection Enabled: Auto-Detect

DESTINATION DETAILS
Mode: Drive
Model: Intenso Speed Line USB Device
Size: 58,6GB
FileSystem: FAT32
Partition Type: MBR

AUTOINSTALL.LST
; CyanLabs Syn3Updater 2.13.3.0 Stable - Autoinstall Mode - Sync 3.4.23188 EU

[SYNCGen3.0_ALL_PRODUCT]
Item1 = RWDataCleaner TOOL - PU5T-14G386-BB_1690840002000.TAR.GZ
Open1= SyncMyRide\PU5T-14G386-BB_1690840002000.TAR.GZ
Item2 = VOICE - 5U5T-14G391-AT_1660763323000.TAR.GZ
Open2 = SyncMyRide\5U5T-14G391-AT_1660763323000.TAR.GZ
Item3 = GRACENOTES - 4U5T-14G423-AC_1615425645000.TAR.GZ
Open3 = SyncMyRide\4U5T-14G423-AC_1615425645000.TAR.GZ
Item4 = ENH_DAB - 1U5T-14G658-AH_1644006443000.TAR.GZ
Open4 = SyncMyRide\1U5T-14G658-AH_1644006443000.TAR.GZ
Item5 = APPS - NU5T-14G381-AD_1689364279000.TAR.GZ
Open5 = SyncMyRide\NU5T-14G381-AD_1689364279000.TAR.GZ
Options = AutoInstall


FILES (5)
PU5T-14G386-BB_1690840002000.TAR.GZ (3,2KB)
5U5T-14G391-AT_1660763323000.TAR.GZ (1,5GB)
4U5T-14G423-AC_1615425645000.TAR.GZ (689MB)
1U5T-14G658-AH_1644006443000.TAR.GZ (57,5MB)
NU5T-14G381-AD_1689364279000.TAR.GZ (869,8MB)

LOG
[25/04/2025 09:59:28] Selected Region: EU - Release: Sync 3.4.23188 - Map Version: Conserver les cartes existantes 
[25/04/2025 09:59:28] Install Mode: Auto-Detect (autoinstall) Forced: False 
[25/04/2025 09:59:28] MY20 Protection: Auto-Detect 
[25/04/2025 09:59:28] Formatting USB drive
[25/04/2025 09:59:28] Re-creating partition table as MBR and formatting as ExFat on selected USB drive
[25/04/2025 09:59:38] Checking Existing File: PU5T-14G386-BB_1690840002000.TAR.GZ 
[25/04/2025 09:59:38] Downloading: PU5T-14G386-BB_1690840002000.TAR.GZ
[25/04/2025 09:59:38] Validating: PU5T-14G386-BB_1690840002000.TAR.GZ 
[25/04/2025 09:59:38] Downloaded: PU5T-14G386-BB_1690840002000.TAR.GZ 
[25/04/2025 09:59:38] Checking Existing File: 5U5T-14G391-AT_1660763323000.TAR.GZ 
[25/04/2025 09:59:38] Downloading: 5U5T-14G391-AT_1660763323000.TAR.GZ
[25/04/2025 10:04:08] Validating: 5U5T-14G391-AT_1660763323000.TAR.GZ 
[25/04/2025 10:04:16] Downloaded: 5U5T-14G391-AT_1660763323000.TAR.GZ 
[25/04/2025 10:04:16] Checking Existing File: 4U5T-14G423-AC_1615425645000.TAR.GZ 
[25/04/2025 10:04:16] Downloading: 4U5T-14G423-AC_1615425645000.TAR.GZ
[25/04/2025 10:06:38] Validating: 4U5T-14G423-AC_1615425645000.TAR.GZ 
[25/04/2025 10:06:42] Downloaded: 4U5T-14G423-AC_1615425645000.TAR.GZ 
[25/04/2025 10:06:42] Checking Existing File: 1U5T-14G658-AH_1644006443000.TAR.GZ 
[25/04/2025 10:06:42] Downloading: 1U5T-14G658-AH_1644006443000.TAR.GZ
[25/04/2025 10:06:47] Validating: 1U5T-14G658-AH_1644006443000.TAR.GZ 
[25/04/2025 10:06:47] Downloaded: 1U5T-14G658-AH_1644006443000.TAR.GZ 
[25/04/2025 10:06:47] Checking Existing File: NU5T-14G381-AD_1689364279000.TAR.GZ 
[25/04/2025 10:06:47] Downloading: NU5T-14G381-AD_1689364279000.TAR.GZ
[25/04/2025 10:08:15] Validating: NU5T-14G381-AD_1689364279000.TAR.GZ 
[25/04/2025 10:08:19] Downloaded: NU5T-14G381-AD_1689364279000.TAR.GZ 
[25/04/2025 10:08:19] Preparing USB drive
[25/04/2025 10:08:19] Checking Existing File: PU5T-14G386-BB_1690840002000.TAR.GZ 
[25/04/2025 10:08:19] Copying: PU5T-14G386-BB_1690840002000.TAR.GZ 
[25/04/2025 10:08:19] Validating: PU5T-14G386-BB_1690840002000.TAR.GZ 
[25/04/2025 10:08:19] Copied: PU5T-14G386-BB_1690840002000.TAR.GZ 
[25/04/2025 10:08:19] Checking Existing File: 5U5T-14G391-AT_1660763323000.TAR.GZ 
[25/04/2025 10:08:19] Copying: 5U5T-14G391-AT_1660763323000.TAR.GZ 
[25/04/2025 10:10:48] Validating: 5U5T-14G391-AT_1660763323000.TAR.GZ 
[25/04/2025 10:11:03] Copied: 5U5T-14G391-AT_1660763323000.TAR.GZ 
[25/04/2025 10:11:03] Checking Existing File: 4U5T-14G423-AC_1615425645000.TAR.GZ 
[25/04/2025 10:11:03] Copying: 4U5T-14G423-AC_1615425645000.TAR.GZ 
[25/04/2025 10:12:02] Validating: 4U5T-14G423-AC_1615425645000.TAR.GZ 
[25/04/2025 10:12:09] Copied: 4U5T-14G423-AC_1615425645000.TAR.GZ 
[25/04/2025 10:12:09] Checking Existing File: 1U5T-14G658-AH_1644006443000.TAR.GZ 
[25/04/2025 10:12:09] Copying: 1U5T-14G658-AH_1644006443000.TAR.GZ 
[25/04/2025 10:12:12] Validating: 1U5T-14G658-AH_1644006443000.TAR.GZ 
[25/04/2025 10:12:13] Copied: 1U5T-14G658-AH_1644006443000.TAR.GZ 
[25/04/2025 10:12:13] Checking Existing File: NU5T-14G381-AD_1689364279000.TAR.GZ 
[25/04/2025 10:12:13] Copying: NU5T-14G381-AD_1689364279000.TAR.GZ 
[25/04/2025 10:13:24] Validating: NU5T-14G381-AD_1689364279000.TAR.GZ 
[25/04/2025 10:13:33] Copied: NU5T-14G381-AD_1689364279000.TAR.GZ 
[25/04/2025 10:13:33] Generating Autoinstall.lst
[25/04/2025 10:13:33] ALL FILES DOWNLOADED AND COPIED TO THE USB DRIVE SUCCESSFULLY! 


Did it work that way before you updated your Sync? I have a 2015 Mustang and as far as I can recall before and after my SYNC3 upgrade, it was only adjustable when the headlights were on.

Thank you for your reply, I didn’t pay attention, I’ve only had the car for 2 months but the level is at its lowest and when it’s sunny I don’t see the numbers…

Interesting. Mine gets brighter when the headlights are turned off.

Yes, that’s what I would like to have :wink:

Try pulling the battery cable for 35 minutes.
Sometimes the other modules get a little squirelly when you do this kind of mod until they get a full cold boot.

ok I will try this solution, thanks for your help

Well, it didn’t work, and I noticed that the brightness adjustment on the sync3 screen is not available, it appears well but is not adjustable…

So while searching in forscan I found this error message, could this be related to my problem?