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I’m hoping someone with deeper NTG 4.5 / HU45 experience might be able to point me in the right direction.
Vehicle is a US-spec Mercedes-Benz ML350 with COMAND NTG 4.5, VIN 4JGDA5HB9CA067398
. I recently installed a Mr12Volt P2000-NTG45MM which integrates as a TV tuner over MOST.
Initially I had a MOST fiber orientation issue, but after correcting that, all factory modules came back online normally and the MOST ring now appears healthy.
Current situation:
Mr12Volt powers on normally
Unit is visible/connectable from phone
No MOST faults
MOST diagnostics show:
TV = installed in actual configuration
TV = installed in specified configuration
So COMAND appears to recognize the TV node correctly on the MOST ring.
However:
No TV menu appears anywhere in COMAND
Return + Clear activation procedure does nothing (it does code on the some video variants, including TV, but that's all. There is no "trigger action" like with other CarPlay boxes
No TV source visible under Video even after "activation"
Clearing all video coding and repeating the activation procedure codes them back as expected, but still no TV
Vehicle did not come with factory TV tuner since it was US market, though it was prewired for rear entertainment, if that's relevant.
At this point I’m trying to determine whether:
There is an additional HU45 developer/variant coding parameter required for TV menu visibility
US-spec NTG 4.5 systems suppress the TV UI layer even when the MOST TV node is recognized
Earlier HU45 Gen1 software requires flashing to High_CY13 / High_CY14 to expose TV/video functionality properly
Has anyone successfully enabled the TV menu on a US-spec W166 NTG 4.5 without factory TV equipment?
Any guidance on:
specific HU45 adaptations
market/region settings
developer coding paths
firmware/software level considerations
would be greatly appreciated.
Thanks in advance — this one has turned into a very German puzzle. 😅 Vediamo shows connected Xentry sees it, knows it's supposed to be there
Last edited by BenjaminKyle; May 6, 2026 at 10:49 PM.
Reason: Clarification
1 - In Automotive, the MOST Bus it's just for Audio and some Data ( volume up/down, DSP, SW updates), no Video signals. 2 - As you can read on interface web "Mr12volt uses the MOST optical system and utilizes "TV" video input" - they use "and". So, the Interface will create a fake flag as a TV, but it will not act as a TV.
In the Schematic, the Video is routed directly to the Car Display. So when you press something...I do not read the entire Instructions - the Interface will cut the Video Signal from HU to Display and the Display will remain connected only to the Interface.
Anyway, the TV menu in the HU may not act as a TV,
Here is a coding from a JP HU4.5, you may try different Options for TV - if there is available under "connected"
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.
NTG 4.5 - Force UI to Display TV - MB Tech Help??
