DIY: Joyeauto Wireless CarPlay for NTG4.5/4.7
Install went flawlessly. Big thanks to cadetdrivr for this perfect guide!
Roadtop also has a video guide but they skip a few steps - like where to put the box! (
The only thing I can really add re install, is that I placed the CarPlay box under the glove box and I didn’t remove the glove box. I simply lowered the under cover after loosening the three T20 screws. I then threaded a stiff picture wire from the footwell to the COMAND cavity. It’s a very short distance and could almost use my fingers, but not quite. Then taped the cables to the picture wire one by one and fished them to the foot well. Stuck the box and antenna just forward of the cabin air filter and closed it up. I’m using wireless and left all the cables inside. The box is only three screws away if needed.
Observations after one outing:
-Back button on steering window doesn’t work. But Siri, phone, and volume on steering wheel do.
-Still a little confused about connecting on start-up and occasionally get kicked off. That could be a bug or user error...
-Going into reverse turns on the OEM 360 reverse camera. But shifting to forward goes back to CarPlay immediately, which is not ideal when parking. There is a “front view” delay timer in settings but it seems to be for an aftermarket camera only, not OEM.
-Took me a little over an hour for the full install. My only suggestion is be gentle and slow everywhere. Everything is pretty fragile on the inside.
-Could be my imagination but the screen looks much brighter.
-Despite claims from the vendor that I needed the AMI cable, I did not. Just setting the system to Aux was needed.
2014 E550 with HK sound.
After installing my unit, I noticed that the cables weren’t long enough to fit the unit in the glovebox, so I decided to place it all the way at the back under the cabin air filter shield (passenger side). I’m sort of glad I did that so it gets some air circulating through the unit as I’ve noticed that the unit gets pretty hot/warm. Does anyone else have a similar issue/ experience with the unit heating up? I guess I’m a bit concerned that the unit doesn’t overheat or worse catch fire and BBQ the car!
Last edited by Zapper_Benz; Jun 27, 2020 at 02:59 AM.




(https://www.youtube.com/watch?v=zKu0shWB4WA).








The GL/ML (X166/W166) is the easiest possible install of them all, IMHO.
It fits in the nice open space right behind the climate controls that's directly below the Comand unit, although I suppose the glove compartment would also be an option if the harness reaches that far.
If you mount it behind the climate controls there are a grand total of two screws required for installation, and both are for the Comand unit locking mounts. The silver trim bezel around the Comand unit pops right off and ditto for the climate control panel itself after the bezel above is removed. You only have to pop out the Climate control panel so it can be moved out the way. The attached wiring is long enough for it to hang down so there's no need to unplug the climate control harness.
Once both the bezel and the climate control panel are out of the way you have easy access to the two screws to remove the Comand unit.
Watch the Unichip installation video in post #2 of the this thread, everything is the same except for the box you are installing.
Last edited by cadetdrivr; Jun 27, 2020 at 11:55 PM.
I don't know if Joyeauto will supply one eventually but there appear to be couple different companies offering what appear to be similar, if not identical units. FWIW, I purchased a unit from Road Top (via aliexpress) as the identical unit from Road Top on amazon.com was more expensive. (It looks like the prices are much closer now. YMMV)
I wanted to try it out in the wife's GL and the installation instructions are essentially identical except for fewer required connections.
IMHO, these newer units have several advantages:
- Longer, and simplified, wire harness so it's easier to place bundle behind Comand unit
- Uses MB mic for phone calls
- No need to wire mic or AUX cables, but you still may need to enable AUX in the Comand engineering mode
- Unit automatically switches CarPlay to dark mode instead of on a fixed schedule
- MUCH more reliable wireless CarPlay connection. It "just works"
- Much more simplified system settings
- Less expensive
- Road Top does not have a website that I know of, so support may be a consideration, including future firmware updates. That said, this new unit is FAR more refined and polished as it is.
please advice to which wire this red wire which runs from the camera module be connected.
Should the camera receive juice from these wires or should the camera be connected to the reverse light in the trunk?
is this wire connected to the 12v power supply or the cable with states back signal?




please advice to which wire this red wire which runs from the camera module be connected.
Should the camera receive juice from these wires or should the camera be connected to the reverse light in the trunk?
Both my MBs have OEM MB rear cameras so I did not use the aftermarket connections.
The Best of Mercedes & AMG
I have 2014 GLK Bluetec - can you please confirm if this will works with my car?
Thank you.
I don't know if Joyeauto will supply one eventually but there appear to be couple different companies offering what appear to be similar, if not identical units. FWIW, I purchased a unit from Road Top (via aliexpress) as the identical unit from Road Top on amazon.com was more expensive. (It looks like the prices are much closer now. YMMV)
I wanted to try it out in the wife's GL and the installation instructions are essentially identical except for fewer required connections.
IMHO, these newer units have several advantages:
- Longer, and simplified, wire harness so it's easier to place bundle behind Comand unit
- Uses MB mic for phone calls
- No need to wire mic or AUX cables, but you still may need to enable AUX in the Comand engineering mode
- Unit automatically switches CarPlay to dark mode instead of on a fixed schedule
- MUCH more reliable wireless CarPlay connection. It "just works"
- Much more simplified system settings
- Less expensive
- Road Top does not have a website that I know of, so support may be a consideration, including future firmware updates. That said, this new unit is FAR more refined and polished as it is.
I'm a bit concerned with how you are mixing 'Android' and 'CarPlay' though. CarPlay is purely Apple/iOS, not Android. There's been a lot less discussion about Android Auto with these units.
I'm a bit concerned with how you are mixing 'Android' and 'CarPlay' though. CarPlay is purely Apple/iOS, not Android. There's been a lot less discussion about Android Auto with these units.
Sounds like these things are pretty responsive and snappy.
Also I still occasionally have the issue with it where the COMAND knob won't advance more than a single 'place' in the interface. Usually all it takes to fix that is to flip back to the MB interface and back again. It's rare - it's possible more recent firmware fixes it but it's good enough for me so I haven't bothered.
Other than those two issues, which are pretty minor, it works fantastically.
Also I still occasionally have the issue with it where the COMAND knob won't advance more than a single 'place' in the interface. Usually all it takes to fix that is to flip back to the MB interface and back again. It's rare - it's possible more recent firmware fixes it but it's good enough for me so I haven't bothered.
Other than those two issues, which are pretty minor, it works fantastically.
AC sensors
wires that were pulled out. Which one goes where?
The sight issues I have are 90% of the time it loads in night mode and can not change it to day mode. And when you use the left steering wheel controls it moves the CarPlay menu. Also if you want to use the car radio you lose the sound from CarPlay as it needs to be on aux to get the sound. I use a radio app which is ok as long as you have cellular connection. Hope this helps.




I don't know if Joyeauto will supply one eventually but there appear to be couple different companies offering what appear to be similar, if not identical units. FWIW, I purchased a unit from Road Top (via aliexpress) as the identical unit from Road Top on amazon.com was more expensive. (It looks like the prices are much closer now. YMMV)
I wanted to try it out in the wife's GL and the installation instructions are essentially identical except for fewer required connections.
IMHO, these newer units have several advantages:
- Longer, and simplified, wire harness so it's easier to place bundle behind Comand unit
- Uses MB mic for phone calls
- No need to wire mic or AUX cables, but you still may need to enable AUX in the Comand engineering mode
- Unit automatically switches CarPlay to dark mode instead of on a fixed schedule
- MUCH more reliable wireless CarPlay connection. It "just works"
- Much more simplified system settings
- Less expensive
- Road Top does not have a website that I know of, so support may be a consideration, including future firmware updates. That said, this new unit is FAR more refined and polished as it is.




https://mbworld.org/forums/e-class-w...-retrofit.html
https://mbworld.org/forums/e-class-w...-retrofit.html




I'd say that's one and of the biggest negatives of the next-gen units at this point. At the same time, I'd also say the current production software is very solid compared to the evolution that the Joyeauto units went through.
Last edited by cadetdrivr; Jul 13, 2020 at 12:29 PM.




FWIW, here's what shipped on the Road Top unit:
- v2.1.0.6.lt.b (PIN: 8032) (Not cross compatible)
- MCU 20.06.02 (Compatible with Andream & Carlinkit)




