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C 250 CDI BlueEfficiency Wagon 4Matic S204, Avantgard
I seem to be going down the same path as you. I am assuming that your question was in relation to an aftermarket Android screen. Did you progress this issue through a firmware upgrade? Any help much appreciated.
I seem to be going down the same path as you. I am assuming that your question was in relation to an aftermarket Android screen. Did you progress this issue through a firmware upgrade? Any help much appreciated.
Hi! You guess right: It's a wireless CarPlay adapter (Kremersino iSmart box), which integrates with the original multi media unit.
I postponed the installation until this summer - so no real progress from my side. I was thinking of using the media interface in the arm rest, but I do not like installing extra hardware, taking apart the arm rest etc. when the good way is only flipping a bit in software...
C 250 CDI BlueEfficiency Wagon 4Matic S204, Avantgard
Thanks for the quick response. I'm so frustrated. Having spent hours installing (i) a dash cam (ii) a rear view camera and (iii) an aftermarket Android screen (don't get me started on refitting the box with the extra wiring harness!), I find myself stumped at the final hurdle which seems to be the Merc COMAND NTG4.0 OS. My used S204 had one previous owner who meticulously serviced the vehicle and even had an OEM MMI output with 3.5mm adapter installed in the glove box. Refuse to give up - hopefully Google will be guide. More posts soon.
I seem to be going down the same path as you. I am assuming that your question was in relation to an aftermarket Android screen. Did you progress this issue through a firmware upgrade? Any help much appreciated.
As you can see, my engineering mode is also different to the ones most people seem to have.
I cannot find an option to turn on the aux mode or to disable MOST so that I can change it.
Does anyone have any idea how to get this working.
I'm installing a Carplay interface from Cockpit.uk for an NTG4.0 system with aux or AMI - I have the interface in the central arm console so I should be good to go.
I have come that far: We both have an APS 50 NTG (yours is with a single CD drive - type 9013 - and mine comes with a CD changer - type 9014). Your firmware is newer (build 16.500 from 10 Nov 2011).
For an APS 50 NTG I only found two ways to get the sound working:
- Deactivate MOST and activate AUX at a Mercedes dealer. They will recode the head unit to match this setting (which was factory coded the other way because of the MMI option).
- Buy a MMI to 3.5mm headphone jack, plug it into the MMI port in the arm rest and modify the CarPlay adapter harness accordingly. Three wires in the harness - I think the red, white and black one - transmit the analog audio. At least in the harness of the Kremersino adapter.
C 250 CDI BlueEfficiency Wagon 4Matic S204, Avantgard
Stumbled Across A Solution By Chance
Can't tell you 'why' or 'how' but I came across a post in another forum suggesting the COMAND unit had problems amending options while the 3.5mm adapter was in use. I unplugged the 3,5mm socket from the MMI adapter through the glove box into head unit and magically sound appeared from the new screen. How it's getting into the Mercedes head unit is anyone's guess. Furthermore, there are still a whole host of issues to sort out this weekend:
- None of my family's iPhones can see the BT connection but my Android devices have no problems seeing and connecting to Airplay (is this an Apple walled garden thing?)
- the NTG radio plays over the Android head unit output such as Spotify
- the sound only comes from one speaker from Android unit's apps but from both with the radio
- sound at full volume is pretty tepid.
I have come that far: We both have an APS 50 NTG (yours is with a single CD drive - type 9013 - and mine comes with a CD changer - type 9014). Your firmware is newer (build 16.500 from 10 Nov 2011).
For an APS 50 NTG I only found two ways to get the sound working:
- Deactivate MOST and activate AUX at a Mercedes dealer. They will recode the head unit to match this setting (which was factory coded the other way because of the MMI option).
- Buy a MMI to 3.5mm headphone jack, plug it into the MMI port in the arm rest and modify the CarPlay adapter harness accordingly. Three wires in the harness - I think the red, white and black one - transmit the analog audio. At least in the harness of the Kremersino adapter.
Best regards,
a207
My kit is different to yours and having another look at the bundle of wires in the harness I found an Aux lead - long enough to wire through the centre console into the arm rest - I already had the MMI to AUX lead - so I'm getting sound and vision now as expected.
Having a little trouble finding enough space to site the box even underneath the glove box I can get it in there - I just can't get the cover plate under the glove box screwed back up again :-(
Still, loving the new functionality with Siri available from the steering wheel :-)
Iain.
Last edited by hodgei; Jun 1, 2023 at 02:53 PM.
Reason: mistake in wording...
C 250 CDI BlueEfficiency Wagon 4Matic S204, Avantgard
No Luck
Originally Posted by a207
Great news, thanks!
Could you please share the other forum link, you found? Through PM, if anything holds you back from posting it here?
Thanks!
Sorry to say, the MOST function is still shaded out even with the MMI/AUX adapter removed. Only options now are a flash of the COMAND OS or find a workaround
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Aux lead
