yashsingh1/xdaforums huggingface dataset:
[MTCB Android Head Units Q&A] halloj:
AFAIK there's no mic volume adjustment. What kind of mic is it, some microphones need a supply voltage to work. There's no such thing present

in this HU. Have you tried the cheap Chinese mic? They don't sound good but you could at least test it for function.

Have you checked your soldering, so you didn't drop solder in between the connecting pins? We have had that in this thread before.
[MTCB Android Head Units Q&A] Blaze Falconburger:
Good point about the mic - how can I check this? I'll see if I can find an old mic somewhere

I am using this one: http://www.amazon.co.uk/gp/product/B003Q0WR5W?psc=1&redirect=true&ref_=oh_aui_detailpage_o09_s00

edit- I've checked the soldering, everything looks clean as far as I can tell, nothing obvious at least..
[MTCB Android Head Units Q&A] halloj:
That mic is the ultimate one for car use. I'm using that one in two installations. Except for any problem

with that particular mic it's good. Dsa 8130 above has another input you might consider. On the other hand

your connector is grounded in the chassis if I understood you correct. The shield should than be left open in the BT end.
[MTCB Android Head Units Q&A] mikejclark:
Hi Alex

I have and A3 8P. I am in the process of retrofitting a multifunction steering wheel and will need to figure out how to get the steering wheel controls to work with my unit. What problems are you having?

---------- Post added at 07:57 PM ---------- Previous post was at 07:47 PM ----------

I ordered my audi a3 unit from keylo on aliexpress and never received the correct fitting brackets so my unit is hanging out :( I can no longer contact keylo on aliexpress and the other contact Hanker Yu, from the same company (HuiFei), says I bought my unit from a fake company!

Does anyone have a reliable contact where I could get the brackets from? Preferably from UK. I have given up with the original seller
[MTCB Android Head Units Q&A] 7floor:
I've decided to make a separate thread for my MTC Sound mod here:

http://xdaforums.com/android-auto/android-head-units/mtc-sound-controlling-bd37xxx-sound-t3234660

In that thread, I will publish updates and provide support regarding the mod.
[MTCB Android Head Units Q&A] almdoki:
hello, suddenly the screen every time I turn the car beeps sound to light but not turn it on screen, it goes black and nothing works
[MTCB Android Head Units Q&A] Blaze Falconburger:
With C32 removed the internal mic is dead, as is the external built in rear jack - so this confirms it is the correct resistor.

Bt with the new mic directly on the BT card pins 4 & 5 I get nothing - I would expect this to just work as it is direct on the card, continuity is good everywhere I've checked (it feels like a hundred times now). Totally stumped here. The BT card isn't dead as it can still make calls, play audio etc, I just can't get the input to work :s
[MTCB Android Head Units Q&A] almdoki:
please help my g5163 not turn radius model, but if you enter the cd asin if you have power, please help
[MTCB Android Head Units Q&A] halloj:
I believe it's a capacitor rather than a resistor, but it doesn't matter. If you reconnect the cap does the internal mic work?
[MTCB Android Head Units Q&A] Blaze Falconburger:
It didn't come off cleanly so I can't reconnect it - could I just bridge it?
[MTCB Android Head Units Q&A] halloj:
That could cause problems, again I believe its function is to block DC supplied to the internal mic. Can't you just get whatever cap with connecting pins and bridged it.

Go for a 0,01 micro-farad or something similar.
[MTCB Android Head Units Q&A] mimpoca:
Either nobody really knows this or nobody wants to tell. I've asked a few times myself with no reply. As it looks to me, the culprit is the stock radio app, which seems to raise the volume (I don't know which stream - I am just trying to describe the symptoms), so that all other sounds are lower. This makes it nearly impossible to hear the navigation TTS. If you exit the radio app, all sounds are suddenly much louder. I was trying to play with the different audio streams, but could not find a solution. Then I tried to find a different radio app that works on our devices, but I could not find any. Now, until a miracle happens, I am using only streaming radio, and all audio issues are resolved...at the expense of a very high data usage. I am not giving up though...
[MTCB Android Head Units Q&A] 7floor:
Radio doesn't have any streams in Android. It's sound does not get into Android at all, being passed from the Radio module directly to the hardware audio input switch/processor and then to the outputs.

So you are not able to control its volume with any standard android app.

As to why exiting radio makes other sounds louder - try examining the datasheet for the audio processor (google for "BD37534FV datasheet").

The hint: when Radio plays, it comes thru one of the main inputs and the Android system plays thru the MONO MIX input; when you exit Radio app, the Android system sounds thru one of the (other than radio) main inputs.

And what is the problem with navigation TTS? What is that you call "navigation TTS"? May be I can help if I uderstand your trouble better.
[MTCB Android Head Units Q&A] TOMMYX2:
i have a Hawei Lte Stick and hear only Online Radio Streams (Tunenin,Xialive) without any problems.

if I do not complete close the MTC Radio app and starts Poweramp or another radio app,then I hear the sound only from one Speaker.

But If i close the MTC Radio app with the BACK button,and start Poweramp etc... is with my sound everything ok.

With my old AN21 -U I did not have this strange problem.:confused::confused::confused:
[MTCB Android Head Units Q&A] mimpoca:
WOW, thank you for the explenation. This makes things a whole lot clearer.

The problem with the "navigation TTS" (Tomtom TTS voice) is that it can't be heard while the radio is playing. The radio is too loud or the rest of the sounds are too low. I changed the stream volumes in the factory settings to "20" for system, and "0" for radio, which makes it a little better, but the TTS voice is still too low to really understand. Again, as soon as I exit the radio app, everything else gets very loud.

So, it looks like the radio volume could only be controlled through a proprietary app that can control the audio processor. I wonder if I could write an app for this :)
[MTCB Android Head Units Q&A] p_mike83:
The problem is when listening to radio/music etc and a navigation announcement is made, we expect that the music/radio volume lowers so that the navigation advice can be heard clearly. This happens when the navi app uses normal voices, but not when using TTS-voice (Text to speech)

The app soundabout allows the navi app to reduce/mute other android sounds when it makes an announcement, but this doesnt work with the mtc apps.

In the settings there is a menu to choose whether to mix or switch to the gps announcement, but that only work with non-TTS-voices.

i am thinking that if soundabout manages to mute other sounds when a TTS anouncement is made, and through the settings the radio app gets mute when a non-TTS announcement is made, there must be a way to fix the problem.

i tried modifying the radioapp to output the sound using the av channel sys, but then i couldnt listen anything, so i reinstalled the original app.
[MTCB Android Head Units Q&A] 7floor:
I see the problem. Funny thing is that my work (http://xdaforums.com/android-auto/android-head-units/mtc-sound-controlling-bd37xxx-sound-t3234660) will mute/lower Radio for navigation app regardless of the stream type. This software tries to mimic what the stock MCU does, but not ideally follows it - I don't consider the stream type. Only problem is that it needs a HW modification, which is not suitable for everybody.

That's not the way. The radio SHOULD use "fm" channel, not the "sys" because this is exactly what makes the sound switch/processor to switch to the correct hardware input for the radio module.

Can you send me your navigation app's APK file? I guess it's TomTom? I can try to decompile it and see if it is possible to e.g. write an Xposed module to make it work thru the music stream instead of TTS, so that stock MTC's functionality will apply for it.
[MTCB Android Head Units Q&A] Blaze Falconburger:
Tried bridging - internal mic still works, so looks like like it's an issue with external mic somehow. I'll try another mic when I can just to guarantee it isn't the mic and go from there. Frustrating!

---------- Post added at 09:35 PM ---------- Previous post was at 09:30 PM ----------

Thanks for this - I only did the first part of [MENTION=290760]dnts[/MENTION]' post as I am only concerned with BT audio, not Android audio. I don't see the link between the requirement to the Android part just to get BT working. Bridging it allows the internal mic to work again - I'll try another external mic etc when I can get one. For now the unit is back in the car as I am driving a lot the next few days, so I'll revisit this in a week or so (wither another mic!)

Thanks for all your help [MENTION=6041319]dsa8310[/MENTION] and [MENTION=1008438]halloj[/MENTION]
[MTCB Android Head Units Q&A] p_mike83:
i thought that the non TTS-Voices are streamed as notifications (stream_notification). an xposed module to fix this would be great! the TTS voice announcement is made through the TTS engine though. you can choose the google one, or download one from the play store. only the soundabout engine allows the android apps to lower their volume respecting the navigation announcement. TT has its own TTS engine on board?
[MTCB Android Head Units Q&A] mimpoca:
I had already read about your solution, and I find it very interesting ;), but I am hesitant to do the HW mod. I would rather wait a little longer until a modified MCU may become available, so it would only be a software mod.
[MTCB Android Head Units Q&A] RyanBRZ:
Is this mic mod applicable for all units in the family of units in this thread? I have a Klyde that I bought as an Eonon GA5167. I would really like to get a usable mic wired up.
[MTCB Android Head Units Q&A] pants001:
With all this talk about using different mic's and the inbuilt one being rubbish, I am really surprised that the manufacturers haven't sorted this issue out.

We are talking about a known solution for around a year or more now!

Id gladly pay an extra $5 or $10 for proper Mic and Wifi

Cmon chinese, work on this ****
[MTCB Android Head Units Q&A] comptechltd:
[MENTION=3590033]Malaysk[/MENTION],

Thank You for your great work!!! Does this release also have the standard launcher that you can switch to?

Steve
[MTCB Android Head Units Q&A] JEMShoe:
FYI, here is a picture of my Settings screen on my 2013 Nexus 7 running Android 4.4.4. Any app I install can, if it needs to and I accept it to, insert an entry under Settings->Accessibility->Services. The Android OS on these HuiFei Android Head Units appear to be ARE giving us a

crippled version

version of Settings. I have asked Joying to fix this but no response. I am trying to fix it but I am an Android programming newbie. I am appealing to anyone with experience to help me repair this. There are apps that can improve the way this device behaves in the car if it can fully utilize the Settings->Accessibility->Services.

[IMG="Screenshot of my Nexus 7 Settings Accessibility Services"]http://i132.photobucket.com/albums/q27/JEMShoe/android_settings_accessibility_services.png[/IMG]
[MTCB Android Head Units Q&A] Malaysk:
Yes, now all my new firmware has TWO launcher, factory and Next. Default loaded factory launcher from JY
[MTCB Android Head Units Q&A] danat:
When I on my unit (RK3188 MTCB-KGL-V2.78) in "settings -> GPS -> GPS Application Options -> Vocalizer TSS" select in place off iGO, then when there is a TTS voice the radio is muted, I can even select if the radio-stream is completely muted or if the radio-stream volume is going down by x dB ( option in GPS settings "Switch or Mix"
[MTCB Android Head Units Q&A] 7floor:
This looks like a suggestion really worth consideration.

danat, can you clarify a few things to me as I'm not familiar with the iGO?

Vocalizer TTS is a 3rd-party TTS engine, so how the iGO speaks thru it, I mean can you choose which TTS to use when configuring iGo or it speaks thru system default engine and you have set Volalizer as a default?

How the iGO behaves if you don't have Vocalizer installed?

By the way, about my idea about Xposed plugin to hack and replace stream type of specific navigation programs - this is not going to work I believe.

I've just looked at the Android documentation, there's no such thing as TTS stream type, like music one, here's the full list:

STREAM_ALARM - The audio stream for alarms

STREAM_DTMF - The audio stream for DTMF Tones

STREAM_MUSIC - The audio stream for music playback

STREAM_NOTIFICATION - The audio stream for notifications

STREAM_RING - The audio stream for the phone ring

STREAM_SYSTEM - The audio stream for system sounds

STREAM_VOICE_CALL - The audio stream for phone calls

This proves that the problem is not with the some stream type being unsupported by the MTC's built-in sound level handling logic, rather this above danat's suggestions is correect one.
[MTCB Android Head Units Q&A] xrapidx:
I tried a 1tb hard drive first, not enough power, it'll probably work if you can get in auxiliary power.
[MTCB Android Head Units Q&A] felipesalomao:
Huifei Android 4.2.2 work with waze ?! This would be my main reason to buy android car DVD.. Another doubt, somebody already bought VW Golf 7 HUIFEI unit ? Works all canbus functions like fuel comsuption display for example ? Thanks
[MTCB Android Head Units Q&A] alexdb78:
Canbus help

Hi, I have buy this universal unit and I waiting delivery... :o

I want realize android app to display info from the canbus line of my car.

I installed in my car a device that allows me to read the messages in the network canbus.

I spent several months to decode the messages of the CANbus network and at the end, I realized a mobile app that allows me to control the on-board computer of the machine over bluetooth.

My device is made ​​up of "Arduino" + "Canbus shield" + "Bluetooth shield"

I would like to replace this device with this car radio.

The problem is that the car radio have wiring "can rx" and "can tx" but my device is connected via signals "Can Hi" and "Can low".

I need to convert the "can rx" and "tx canon" in "Can HI"​​ and "Can Low".

Do you think I can simply use the MCP2551 transceiver? Do you have the source code of an app that uses the canbus?
[MTCB Android Head Units Q&A] saifbarry:
Waze works fine. You may have to do some DPI adjustable to get it to look right.
[MTCB Android Head Units Q&A] xrapidx:
128GB flash drive doesn't seem to work.

Copied 100GB of music to it, the headunit reads it, and I can start playing music, but after about 3min's it gets stuck, and says the device has been removed. :(

Anyone have anything I can try (Different file system, etc?)? The 8GB worked fine. Both as FAT32
[MTCB Android Head Units Q&A] 1-2-Hak:
Had the same issue with a 64gb Flash disk. I think something gets reset on the usb bus somehow. Ended up getting a 64gb sd card and have no issues now.
[MTCB Android Head Units Q&A] saifbarry:
I have the same problem with a 32gb SD card. No problems with a 16gb card. Haven't had a chance yet to thoroughly test the 32gb SD card but I was thinking it may have been defective until now. There are no issues reading from it but it'll display the same behavior as yours if I try to write big files to it.
[MTCB Android Head Units Q&A] typos1:
As I ve said before, Andoid is perfectly papable of reading up SD cards up 128Gb, but you may have to re format them or change something in Android to remove the software defined limit, its a relatively easy thing to do, wikipedia's article on sd cards gives info, google it as well, your ll probably find the thread you need is on xda anyway.
[MTCB Android Head Units Q&A] sickbro80:
I would be willing to bet it has less to do with the flash drive and more to do with the system trying to catalog 100gb of data. Try putting like 10 songs on there and see if it crashes.

---------- Post added at 08:31 AM ---------- Previous post was at 08:22 AM ----------

With all this talk about Waze, I was reading about it and it sounds very cool. I was thinking of trying to make a tasker profile that would automatically plot my work every morning if it boots up say Monday through Friday between 7 and 8. Everything I've read says its great at avoiding traffic, so if I could do it automatically, it would be pretty awesome.
[MTCB Android Head Units Q&A] xrapidx:
Yeh, its definitely something like this...
[MTCB Android Head Units Q&A] podge3:
This is great - thanks :fingers-crossed:

Something to note, the mod does fix the loud issue but the "loud" box is not ticked in amp settings.
[MTCB Android Head Units Q&A] typos1:
NO its nothing to do with that, I told you what its to do with in my post above !!!!!!!!!!!!!!!!!!!!!!!
[MTCB Android Head Units Q&A] agentdr8:
Yep. It forces loud via an AudioManager parameter. The checkbox is read from the system settings preferences, which gets reset every boot for some reason. It's an aesthetic thing, but I can put it on the list of things to fix for the next release.
[MTCB Android Head Units Q&A] xrapidx:
Ok know it all... why is the same flash drive working at 50% full without issue?

Your previous post gave no value just stating there is some issue, sort it out yourselves.
[MTCB Android Head Units Q&A] illmatik:
Hey all. I believe I have a variant of this head unit built specifically for my chassis of car. I bought it from a US based retailer but I found what looks to be the exact same unit for sale from chinese wholesalers. It's an Android 4.2.2 A9 head unit built for BMW E39 or E53 cars.

Does anyone else have this unit, or are there more similar units to mine that I can get support with? My unit is working pretty well but there are a few things I'd like to fix. I haven't found anyone who has the same one yet.
[MTCB Android Head Units Q&A] Blaze Falconburger:
I'm running a 500GB USB HDD - it needed to use a second USB for additional power - I guess one solution to this might be to use a USB hub if you need additional USB sockets.

I don't catalog it though - I just use folder browsing through PowerAmp
[MTCB Android Head Units Q&A] illmatik:
After a little digging around it looks like I've got a HuiFe/KGL-753 which means you guys are all my family from now on. Cant wait to read every post of this thread and get caught up to speed.

Does anyone else have an E39 BMW with this unit? The fitment was not easy as I had to hack out the bottom part of my bracket. My biggest fitment issue is the GPS antennna connector does not have enough room. The one that came with the unit broke as I pushed the unit into the chassis. I have a replacement one but it's going to do the same thing.

The only thing I can think of is some kind of 90 degree coax adapter. Has anyone had these types of issues?
[MTCB Android Head Units Q&A] typos1:
I dont "know it all" I know the basics and gave you the info so you could sort it out yourselves, but there was a solution to your problem and you just ignored it.

Its probably a formatting issue, re-format it and if that doesnt work just use the search function on xda to find out the software solution in more detail.

I dont want to fall out about it, I was only trying to help, I just couldnt believe you totally ignored my post and said it doesnt work.

Unless you want me to come round and od it for you !! Lol :)
[MTCB Android Head Units Q&A] agentdr8:
I can't say for sure, but I believe the gps antenna uses sma connectors. There's plenty of 90 degree sma/rp-sma adapters out there.
[MTCB Android Head Units Q&A] DWhite456:
probably a long shot but has anyone been able to connect a factory Sirius satellite unit up to the HU? I have a factory Sirius module that came stock with my VW unit.
[MTCB Android Head Units Q&A] p_mike83:
I will try [MENTION=233234]danat[/MENTION] idea. If this fixes the problem,means that the MCU monitors the GPS app set in the settings for audio output, and mutes/reduces volume of all audio streams(regardless radio/music/streaming apps). As this method is aware of non-android audio streams. I wonder if setting the tts engine in those settings brakes anything. Some notification sounds of the navi app eg speed limits will probably not be able to reduce volume/ mute other sounds. That could be solved maybe by modifying those settings to monitor the GPS app and the tts engine simultaneously.
[MTCB Android Head Units Q&A] ch_swat_89:
DAB

Anyone tried this?

http://navallstore.com/Head-Units/BMW/dab-android-dab-navall

not very cheap....
[MTCB Android Head Units Q&A] 7floor:
My current knowledge tells me that this is impossible.
[MTCB Android Head Units Q&A] dark alex:
Hi

unfortunately A3-Brackets I received are NOT fitting at all, too... I had to modify them and remove the top cover of the radio as well as put some rubber knobs under the unit to make it fit my car's mount. I thought I received wrong ones but now thtat you are also having problems...
[MTCB Android Head Units Q&A] pencilhead:
Hi [MENTION=3590033]Malaysk[/MENTION],

Latest version works with wikicamps. Not sure if you did anything in this version to fix, but wanted to let you know it is now ok.

Many thanks for all your hard work. It is really appreciated!!!!!
[MTCB Android Head Units Q&A] mimpoca:
I tried this long ago. It actually does work as expected, but the volume levels are still such that the navigation voive is too low to be understood.

I am just not understanding why all volumes are lower when the radio app is active, even notification sounds. It just doesn't make sense.
[MTCB Android Head Units Q&A] Malaysk:
I read about all the problems with the firmware (but not answer), and attempts to correct errors in the following versions ;)

Good luck.
[MTCB Android Head Units Q&A] Hisma:
I posted this in the carjoying thread, but I will cross-post here since others may have this issue.

I have a problem with the random loss of volume control using my volume knob on my JY-UQ124 unit. It is seemingly random, but sometimes comes back after a unit reboot.

I am also experiencing an even bigger issue. Overall volume control stops working at random also. My unit is forgetting my SWC presets. Seemingly random, once again. If I go back and reset the SWC settings and re-map them, everything is fine again. This happened twice this morning within a 2 hour period.

I am on the latest malaysk ROM for 1024x600 RK3188. Not sure if this is a ROM issue or unit issue.
[MTCB Android Head Units Q&A] doctorman:
any chance the connections in the back are lose ?
[MTCB Android Head Units Q&A] Hisma:
no. all wires are soldered and heat shrinked.
[MTCB Android Head Units Q&A] pirri_mori:
Hi [MENTION=3590033]Malaysk[/MENTION]

in the latest version of rk3188, roulette does not work I spent song on Spotify and Musicall.

there anything I can do to fix it?

In the previous version if I worked

Soryy for my bad english.

Cheers and thanks
[MTCB Android Head Units Q&A] Skippman:
Is there an APK to adjust the time alignment for the RCA outputs on this?
[MTCB Android Head Units Q&A] Malaysk:
Let's try. Unzip the file and copy in system/etc/permissions/ program Root Explorer and set the file permission 644 and reboot
[MTCB Android Head Units Q&A] TOMMYX2:
i have no Problems with Phonecalls (BT20 Volume) with a Parrot Mic,but the Internal Mic sucks (New KLD2 Board).

Is it possible to change the internal small Mic with a better Mic?

because Ok Google Feature dont work really good in my Car.:rolleyes:
[MTCB Android Head Units Q&A] Hisma:
Is there a way to get "ok google" to work from anywhere? I have tried when I have driving or stationary, but it never works. I always need to go directly into google voice first.