Road Top Carplay - real life reviews please
I have read back through all the threads, there are several around installation but I am looking for medium-long term reviews of day to day usage please.
Thanks all
So far so good. I like that it connects wirelessly so I can keep my phone in my pocket. At times I need to disconnect and reconnect my iPhone via Bluetooth but otherwise it performs solidly and starts/connects automatically when I fire up the engine. It works just like my wife's Apple CarPlay which came standard with her car. Everything connects/works as it should: Google Maps/Waze/Apple Maps, Siri, Apple Music, Calendar, etc. Easy to switch back and forth to the Mercedes COMAND interface: just hold down the star/favorite button. Making and receiving phone calls is easy, too. It's the smartest upgrade I've made to my car and makes it feel much more modern.
I tool the plunge on this (ordered from AliExpress - took 9 days to arrive in the UK) and installed it yesterday. Takes a while to install, the instructions in the box are not great but there are many videos online to take you through the install. The hardest part is getting all the cables carefully placed back behind the radio. I couldnt fit the box under the radio itself so its currently in the mesh pocket on the passenger side whilst I work out a better location.
im curious if I can avoid the usb dongle to aux in the center compartment thru the activation. I know other modules do this, but not sure about road top.
I’ll let the group know how it goes. I’ll probably post the activator online in the marketplace soon.
PROS:
1) Navigation with Waze/Google Maps/Maps makes driving so much better
2) Apple interface on your screen
3) Apps work well
CONS:
1) Even when you turn the engine off, carplay is STILL on
>> so when you open the door, your phone will automatically connect to the carplay even when the engine is off (which was annoying for me so I set it so that my phone doesn't automatically connect to the Carplay wifi)
>> i had to disable wifi when I wash my car because I use my headphones and it just automatically connects to carplay and cuts my music out from my headphones
2) When you're connected to carplay, and you start recording with an app on your phone (I used Snapchat), the microphone quality is so bad it sounds worse than Android quality.
3) Sometimes the auxillary battery malfunction error pops up on the dash (it goes away after a while)
FINAL VERDICT:
With all this being said, for day-to-day driving to known places I still use MB Bluetooth since it doesn't glitch out, but when I need the directions on Google Maps/Waze I use Carplay since it's really helpful.
PROS:
1) Navigation with Waze/Google Maps/Maps makes driving so much better - Agree
2) Apple interface on your screen - Agree
3) Apps work well - Agree
CONS:
1) Even when you turn the engine off, carplay is STILL on
>> so when you open the door, your phone will automatically connect to the carplay even when the engine is off (which was annoying for me so I set it so that my phone doesn't automatically connect to the Carplay wifi)
>> i had to disable wifi when I wash my car because I use my headphones and it just automatically connects to carplay and cuts my music out from my headphones
I dont use wireless CarPlay, so I dont even have this issue. I did check to see if the unit stays 'alive' and it seems to fully switch off after a few mins (I was concerned about battery drain)
2) When you're connected to carplay, and you start recording with an app on your phone (I used Snapchat), the microphone quality is so bad it sounds worse than Android quality - I use MB Bluetooth for calls
3) Sometimes the auxillary battery malfunction error pops up on the dash (it goes away after a while) - never had this happen
FINAL VERDICT:
With all this being said, for day-to-day driving to known places I still use MB Bluetooth since it doesn't glitch out, but when I need the directions on Google Maps/Waze I use Carplay since it's really helpful.
One question - where did you put the unit when you installed it ? I could not get it under the radio so ended up with it in the passenger side net thing (temporarily). I am looking to hide it somewhere.
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If you have COMAND, it's a much larger unit so you cant stack the module under it. Audio20 you can.
There's an area at the floor of the console area, further towards the firewall,past the area the COMAND unit which I put my module in. It looks like a triangle topped opening. You can see the black module in the pic below, with the letters TOG (the toggle switches of the unit). Look at the right metal star torque bolt, and it's right under and behind, past the yellow module.
This pic is with all the wiring connected to the roadtop. I could only get the module in one way with all the harnesses attached. Toggle switches to the right.
Read my instructions - it takes patience to slowly feed in the wires / COMAND back into position, where I was slowly packing the large harnesses on top of the roadtop module as the COMAND was being put in. I was able to fully install the COMAND, bolt it down and have no extra wires showing from behind the COMAND. Good luck.
There's actually a lot of room for air to circulate. So far I haven't ran into any issues with heating causing the module to run any different. But I certainly will keep and eye out for it.
For anyone else interested, I actually took a slightly different approach. I removed the glove box and fitted the unit in the cavity to the right of where the command unit sits. You can only access this by removing the glove box. I then fed the wires through the into this cavity. Just about enough space.
Cavity area highlighted in green in the photo attached.
Thanks
I also used the space at the back of the unit (where the foam is) to gently push the larger new interface cable and block connector into. The command unit then fits back in without having to being forced.
I would suggest by using this method, the box has significantly better ventilation as there is more space and the vents on the side of the module are not covered over. You can also access to the module if required at a later date, by removing the glove box, rather than repeatedly taking the dash apart and risking damaging some of the connectors.
You can find videos on YouTube for the glove box removal -
Last edited by Bigreyrey; Jul 13, 2021 at 10:02 AM.
On a side note I ended up removing it again as it kept switching over to the module interface everytime I went out of reverse.
So thanks Bigreyrey, I really appreciate your help with this
Last edited by artw1224; Jul 19, 2021 at 08:07 AM.
As far as I know the roadtop only intercepts the picture coming from the original system and replaces it with it's own interface. Audio has to be sent to the original system via AUX.
Any equalizer adjustments done on the unit will be applied before it reaches the original system, which then still does it's own processing.
I have read back through all the threads, there are several around installation but I am looking for medium-long term reviews of day to day usage please.
Thanks all

PROS:
1) Navigation with Waze/Google Maps/Maps makes driving so much better
2) Apple interface on your screen
3) Apps work well
CONS:
1) Even when you turn the engine off, carplay is STILL on
>> so when you open the door, your phone will automatically connect to the carplay even when the engine is off (which was annoying for me so I set it so that my phone doesn't automatically connect to the Carplay wifi)
>> i had to disable wifi when I wash my car because I use my headphones and it just automatically connects to carplay and cuts my music out from my headphones
2) When you're connected to carplay, and you start recording with an app on your phone (I used Snapchat), the microphone quality is so bad it sounds worse than Android quality.
3) Sometimes the auxillary battery malfunction error pops up on the dash (it goes away after a while)
FINAL VERDICT:
With all this being said, for day-to-day driving to known places I still use MB Bluetooth since it doesn't glitch out, but when I need the directions on Google Maps/Waze I use Carplay since it's really helpful.


