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Reversing camera connection issues

Hello,
I've got MTCE unit (PX3) that I'm trying to install into Toyota truck. I've had another unit in previously and it had a reversing camera that was activated when the reverse was engaged by a dedicated wire in a harness. I've connected my camera to Video-In connector (H-5 on the attached harness). I can see video fine if I run AVID application, so this is working. What is not working is automatic engagement when I put the car in the reverse.
I can't seems to find a dedicated reverse signal. I understand that it may detect reverse through CanBus and I've connected included CanBus decoder to the unit, however it still doesn't work.
Am I missing something and what would the recommended troubleshooting suggestions?

Hi,
You are doing it wrong. You should not connect the video signal to Video IN of the unit. This way - the picture will show only when you launch the AVIN application. You should connect it to the CAMERA or REVERSE labeled plug. What is the G plug for ? Is it for a reverse camera or Car DVR ?
You can power up the camera (+12V and GND) from the white reverse light.

Thanks for the reply, however I can't sadly see any REVERSE or CAMERA labeled connectors on my unit. Plug G has microphone cable and that is it (see attached). Plug H has also a connector labeled DR-V and main connector has something labeled CCD-IN. I've tried plugging my camera to these connectors and sadly none of them seems to show camera feed when the reverse is engaged. Any other ideas on how I can get camera to work?

SuperPuper2K said:
Thanks for the reply, however I can't sadly see any REVERSE or CAMERA labeled connectors on my unit. Plug G has microphone cable and that is it (see attached). Plug H has also a connector labeled DR-V and main connector has something labeled CCD-IN. I've tried plugging my camera to these connectors and sadly none of them seems to show camera feed when the reverse is engaged. Any other ideas on how I can get camera to work?
Click to expand...
Click to collapse
When you bought it, was it advertised as having this capability? If so, I'd try to get a refund. Mine (and most others that I've seen) that have reverse functionality have a dedicated video in line that's labeled as such.

See K 5 and 6.

Hazard15301 said:
When you bought it, was it advertised as having this capability? If so, I'd try to get a refund. Mine (and most others that I've seen) that have reverse functionality have a dedicated video in line that's labeled as such.
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Click to collapse
Yes, the unit has reversing camera as an option and sadly the seller is less then helpful in resolving this issue. Having looked on the forums I can see that even when the camera is not connected the head unit should switch to black screen when reverse is engaged. In my case it doesn't do that. Does it mean that something is not working with CAN bus decoder? I've looked through factory settings and tried all options available for my car manufacturer and sadly they didn't make any difference.
Is there a way to test CAN bus decoder to see if it is working at all or not?

I have a reversing camera problem albeit a different one, that's been worse today. Sometimes after I finish reversing the camera image stays on the screen, frozen. I don't know if something's wrong with the reverse detection input or the camera video signal. I've had this with other units of the same model (KSP) or at least they were also MTCD PX5. My thought is to play with the resistances to the MCU. For now if I reboot it's back to normal.

SuperPuper2K said:
Am I missing something and what would the recommended troubleshooting suggestions?
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Click to collapse
Your reverse camera should go to the main power connector 5th pin(CAM-IN) and reverse trigger line should go to 6th pin(CAM-LINE).
Ideally your main power connector should have yellow video in connector which connects ground and 5th pin.

smnrock said:
Your reverse camera should go to the main power connector 5th pin(CAM-IN) and reverse trigger line should go to 6th pin(CAM-LINE).
Ideally your main power connector should have yellow video in connector which connects ground and 5th pin.
Click to expand...
Click to collapse
You've just made my day. This was exactly the solution to my issue. The wires were connected to some strange connector, however after I've rewired it to my camera everything started working just fine.
Thanks a lot for your help.

hello
I have exact same issue, with wireless camera connector , have yellow connector to ccd in and nothing changes maybe somebody could draw scheme how to connect to head unit , have same connector.

[Dasaita] DVR Connector Pin-Out

I still trying to make working Factory setting "Switch to front camera for XX seconds after reverse gear" (translated from my language) on my head unit with a simple RCA/CCTV camera.
Now i have hooked (hoping in fast working solution) the camera video out to AV-IN HU connector and after reverse gear for 5 seconds (thats my amount fo time selected on factory settings) i get the classical no video exclamation mark, so my attempt is wrong.
Thinking how solve the situation the other iadea i had is hookin the camera video-out to the reserved DVR 6 pin connector of my HU, but i dont know how it work and what are the pin-outs.
I think, hoping for sure, 2 of them are Cam +12V and GND, 2 are Video (+) and Video (-) and the other 2 i presume are ACC 12V+ and GND or Data (+) and Data (-).
Someone with DVR Cam on HU can confirm and can draw a little schematic with the pin-out and can confirm in if idea of using the factory settings "Switch to front camera for XX seconds after reverse gear" can work right?
Thanks in advance!

You should not connect to video out, that's for an additional screen. You need to have something like camera in
Verstuurd vanaf mijn Z2 Pro met Tapatalk

hans.vinkers said:
You should not connect to video out, that's for an additional screen. You need to have something like camera in
Verstuurd vanaf mijn Z2 Pro met Tapatalk
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Click to collapse
The problem is that Dasaita HU doesnt have a dedicated front camera input, so im trying to circumvent this

See my post in this thread;
https://forum.xda-developers.com/an...development/parking-camera-mod-t3663956/page6
Not the pinout diagram you asked for but a simple circuit you can build for cheap to get what you want by plugging in both your front and rear cameras into your one reverse camera input.

homer.ali said:
See my post in this thread;
https://forum.xda-developers.com/an...development/parking-camera-mod-t3663956/page6
Not the pinout diagram you asked for but a simple circuit you can build for cheap to get what you want by plugging in both your front and rear cameras into your one reverse camera input.
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Click to collapse
Thanks for your suggestion, a good idea! But there is a problem: im totally noob on realizing circuits! i have some skills in soldering and no more.
Do you want to draw a ready to solder circuit for me? are you using standard or smd components? What type of relay you have used?
EDIT:
Today i received a message from Dasaita support pointing me to a video box auto-switcher, i think it work in similar mode of your. What you think about that?
Link:
CAR Cameras Front and Rear camera Image Switch Control Box View Parking Camera System Visable parking intelligent control box

Dasaita: F-cam and F-cam power available somewhere?
Sorry for resurrecting an old thread...
iRcKenny said:
The problem is that Dasaita HU doesnt have a dedicated front camera input, so im trying to circumvent this
Click to expand...
Click to collapse
Hi, I also own a Dasaita unit, and want to integrate a front view camera.
From some posts in this thread that was previously mentioned here (Front parking camera mod), it seems that some MTCD units (KDL?) have indeed pins for the front camera available at the back of the headunit, even if the wire harness don't have the corresponding cables for them.
After migrating to Android Pie some days ago, I activated the system menu to show the front camera and selected CVBS for the DVR, all this with a camera connected to the Aux In yellow input (I know, this will not work, it was just a test). But to my surprise, now I don't see the DVR App anymore (but I see now another app called F-cam). The interesting thing is that through this app, I'm now able to see my (stock) reverse camera whenever I want (even when I'm not in reverse). I thought that this camera was only powered on while in reverse (but apparently is not). As expected, when I switch to the front cam icon in the app, nothing is shown (only the warning icon), since this app expects the front camera to be connected to a specific video input not present in my harness.
Now to my question: Did somebody find out if the Dasaita PX5 Android units have this two pins (F-cam, 12V for F-cam) available in the back connectors (even if not available in the wire harness)?
(Soldering the proposed mods is definitely beyond my capacity - neither the internal nor external one; thanks anyway)

Hi, I'm looking for pinouts of RCA out of Dasaita units.
Can someone send a picture here?
Thanks

Question NaviFly 7862 steering wheel controls not working

Hi
I have purchased an Android HeadUnit for my Renault Megane 2 (2007) from AliExpress. Every function works except the steering wheel controls. The unit has the UIS7862 CPU @1.8Ghz, 6gb Ram and 128gb storage. I have installed the CanBox correctly and tried many CanBox settings in factory menu, but I cannot get the control app to enter learning mode. Does anyone have any idea? Maybe the built in key map application is at fault (com.syu.steer).

Did you find a solution to your problem yet?
I'm stuck at the exact same scenario, same unit. The support over at AliExpress mention to me to select "XP" for canbox settings. However, my canbus module is by Raise, hence I should be using the "RZC"
Also, my reverse cam doesnt work too.
Pls share your findings. Thank you!

I got the steering wheel keys to work with a custom controller made by an engineer in my country specifically for my car and my HeadUnit. The controller is connected directly to the wheel controls and the "key" wire on my HeadUnit. I had to disassembly the steering wheel base and route the cable around the original one. Now I can map every key to an action in the Key Learning app. For the backup camera, because I used a wireless kit, I couldn't use the "back" camera wire to trigger the HeadUnit to switch to it. The kit came with a receiver which only had power wires and a yellow RCA cable. I wired the receiver's power cables to the ACC power so that the receiver only powers on when the engine is running and I managed to map a button on the steering wheel to switch to the RCA input. Now when I want to use back up camera, I just need to press a button to see the image. The camera's transmitter is wired to the license plate bulb and I managed to fit it in the rear bumper.
This wasn't a "plug and play" experience that the Chinese seller promised, but overall I can say I am pretty happy with the end result. The audio quality is wayyy better than the stock HeadUnit. I didn't know that my stock speakers could get that loud and have so much bass. The DSP chip does it's job wonderfully. Also the radio reception is better than with the stock unit. The Android HeadUnit is fast and snappy. Apps open almost instantly and those 6gb of ram really help. I could compare the overall user experience with my OnePlus 7 phone. The unit also cold boots very quickly. The wifi reception is pretty poor. The unit shows 75% signal when my phone is in the car. It doesn't bother me because I put a Sim card in the unit and the mobile reception is as good as on my phone.

andrei-2200 said:
I got the steering wheel keys to work with a custom controller made by an engineer in my country specifically for my car and my HeadUnit. The controller is connected directly to the wheel controls and the "key" wire on my HeadUnit. I had to disassembly the steering wheel base and route the cable around the original one. Now I can map every key to an action in the Key Learning app. For the backup camera, because I used a wireless kit, I couldn't use the "back" camera wire to trigger the HeadUnit to switch to it. The kit came with a receiver which only had power wires and a yellow RCA cable. I wired the receiver's power cables to the ACC power so that the receiver only powers on when the engine is running and I managed to map a button on the steering wheel to switch to the RCA input. Now when I want to use back up camera, I just need to press a button to see the image. The camera's transmitter is wired to the license plate bulb and I managed to fit it in the rear bumper.
This wasn't a "plug and play" experience that the Chinese seller promised, but overall I can say I am pretty happy with the end result. The audio quality is wayyy better than the stock HeadUnit. I didn't know that my stock speakers could get that loud and have so much bass. The DSP chip does it's job wonderfully. Also the radio reception is better than with the stock unit. The Android HeadUnit is fast and snappy. Apps open almost instantly and those 6gb of ram really help. I could compare the overall user experience with my OnePlus 7 phone. The unit also cold boots very quickly. The wifi reception is pretty poor. The unit shows 75% signal when my phone is in the car. It doesn't bother me because I put a Sim card in the unit and the mobile reception is as good as on my phone.
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Click to collapse
Thank you for explaining your solution. Seems like quite a bit of work.
I managed to get my steering controls working finally. Got the correct canbus setting and corrected a connection.
Now, I'm stull stuck with the reverse cam issue. The +12V does energize when I am in reverse gear - I tested this when I connected my cam to DV-in and cam turns on only when in reverse.
But I just don't understand why the Android won't switch to Cam in during reverse gear.
Will continue to seek help from the manufacturer. Otherwise, it's a great HU as you said. Awesome speed!

MasK said:
Thank you for explaining your solution. Seems like quite a bit of work.
I managed to get my steering controls working finally. Got the correct canbus setting and corrected a connection.
Now, I'm stull stuck with the reverse cam issue. The +12V does energize when I am in reverse gear - I tested this when I connected my cam to DV-in and cam turns on only when in reverse.
But I just don't understand why the Android won't switch to Cam in during reverse gear.
Will continue to seek help from the manufacturer. Otherwise, it's a great HU as you said. Awesome speed!
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Click to collapse
You connected the reverse wire?
Maybe this triggers the camera view of it doesn't work via the canbus.

Well, it does work via canbus, just doesnt switch to cam input automatically. Perhaps its some software settings.

MasK said:
Well, it does work via canbus, just doesnt switch to cam input automatically. Perhaps its some software settings.
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Click to collapse
Not all canbus provide the reverse signal. So maybe you have to provide the reverse signal on the separate input.

TorstenH said:
Not all canbus provide the reverse signal. So maybe you have to provide the reverse signal on the separate input.
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Click to collapse
I feel that the HU knows when I am referring (CANBUS might be working here), because the 12V turns on when Im in reverse. The only issue is the HU doesnt switch to the cam automatically. Looks to me like a SW issue. Still awaiting reply from manufacturer.
Also, I realised my backward/forward buttons are swapped. Why is it I can't re-learn them?

It may not be the same for the Navifly, but on my unit, G5 must get the proper voltage to "detect" the car has been put in reverse. I'm re-using my factory rear view camera and it's a 6.5V camera. However, I had to up the voltage to 8.6V so that G5 go that voltage...then the rear image showed up. I reused the car wiring and that's why I had to do this.
Check the voltage that G5 is getting. With a canbus module, I believe there is a wire from the canbus going to G5. If no voltage, make sure the pins are in properly.
FYI, if you are using a canbus and the steering wheel controls go through the canbus, then I believe that you cannot remap the keys.

The 12 V from the reverse wire are coming from your car (or in some cases from the canbox if the information gets transmitted from car to the box via canbus).
My suggestion is:
There is a separate reverse connection (usually a brown wire) on the head unit which triggers the radio to open the app which shows the image of the reverse cam.
You could even connect ACC or B+ to the reverse connection for testing purposes.

mastrv said:
It may not be the same for the Navifly, but on my unit, G5 must get the proper voltage to "detect" the car has been put in reverse. I'm re-using my factory rear view camera and it's a 6.5V camera. However, I had to up the voltage to 8.6V so that G5 go that voltage...then the rear image showed up. I reused the car wiring and that's why I had to do this.
Check the voltage that G5 is getting. With a canbus module, I believe there is a wire from the canbus going to G5. If no voltage, make sure the pins are in properly.
FYI, if you are using a canbus and the steering wheel controls go through the canbus, then I believe that you cannot remap the keys.
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Click to collapse
Absolutely correct.

Thanks guys, but there is no other brown wire for this.
I have a discussion abt this on this thread too:
Medeke/Navifly 7862
Hi, Recently received above unit for my 2006 RS4. everything is great (much better then the M400 I had before) apart from the radio. It seemed to work for the first 2 days, then worked intermittently and now not at all. I have tried...
forum.xda-developers.com
My "cam12V" wire is from the HU and it turns on when I am in reverse. Does this mean that this signal might be coming from my canbus? If so, is there another input back to the HU to trigger the screen to display the video feed? Only other wires I see are AMP related

Give 12V to pin 2 and check if the app to display the image of the cam will start:

TorstenH said:
Give 12V to pin 2 and check if the app to display the image of the cam will start:
View attachment 5374441
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Click to collapse
Yes! It took me a while to figure this out.. mainly because I'll have to cut the wire (wasn't very confident in that)
and also.. the wires at Pin2 didn't make sense! They were more like Battery12V. I did cut and tested that.
So.. it turns out its a pink wire at pin3!
I realized this as I looked at my old Dasaita wires from the canbus connector. Since canbus is a standard, they should be comparable. That reverse wire went into Pin3.
I'm really surprised that Mekede and Navifly has this pin layout printed in all their listings.. but it's just wrong.
Thanks alot for the help!

That means it works now? I think you had to cut the ACC wire according to the manual because the "ignition on" information is provided by the can box.

TorstenH said:
That means it works now? I think you had to cut the ACC wire according to the manual because the "ignition on" information is provided by the can box.
Click to expand...
Click to collapse
Yes it works now. Check out the images. The Pin2 (red) is probably ACC or batt 12V as there was no power when cut. I then cut the wire opposite it (pin10) in case I was looking at the connector wrongly. That turned out to be the headlight sensor.
After tracing the wire and comparing to my old Daisata, it turns out Pin3 (pink) is the reverse IN.

Excellent. Thanks for the clarification.
That means it makes sense to get the wiring diagram from the old radio of the car and compare it with the description of the new head unit.
In my case I had to completely rewire the harness (just if someone is interested):
Junsun V1 MTK8259 - the adapter battle (Kia Ceed Jd) / OEM camera usage / reference thread
I bought the Junsun V1 head unit but my Kia Ceed JD had a OEM nav unit which isn't directly compatible to Junsun V1. So I re-wired the wiring harness based on the pins description of my original OEM navigation unit. I'm only modifying the wiring...
forum.xda-developers.com

The only thing that I could compare to (between old and new HUs) is the canbus connectors. Rest cannot be compared as they're all different.
Oh well..
Anyways, the current Mekede I have has Radio chip NX6686. My old Dasaita PX5 also has a NX6686. However, the radio reception is absolutely trash in the new one. I dont listen to radio that often (I can resort to streaming radio) but my dad takes the car occasionally and he's already complained about it
Your experience on the harness rewiring is pretty intense!
Update: Turns out my Antenna connector was a tad loose and I had to do a re-connect. The radio reception is all good now

MasK said:
Thank you for explaining your solution. Seems like quite a bit of work.
I managed to get my steering controls working finally. Got the correct canbus setting and corrected a connection.
Now, I'm stull stuck with the reverse cam issue. The +12V does energize when I am in reverse gear - I tested this when I connected my cam to DV-in and cam turns on only when in reverse.
But I just don't understand why the Android won't switch to Cam in during reverse gear.
Will continue to seek help from the manufacturer. Otherwise, it's a great HU as you said. Awesome speed!
Click to expand...
Click to collapse
So you found correct canbus settings and connections .. i cant find anything about you sharing them

Question Android app for rear camera with parking lines

Hey guys,
Ive got an Joying JY-UQ135N4G headunit with android 10.
As I have no signal cable for the reverse gear detection, I connected my rear camera to AV IN. When connecting the camera to AV IN there is luckily no need to connect the orange signal cable for reverse gear detection.
Unfortunately the screen does not show any parking lines when using the default "aux" app. (The rear camera app can't be used as the camera is connected to AV IN)
Is there any alternative app that I can use to get the parking lines?
Many thanks & Best regards!

You're doing it wrong.

marchnz said:
You're doing it wrong.
Click to expand...
Click to collapse
? Did you read the whole post?

pwn1ca said:
? Did you read the whole post?
Click to expand...
Click to collapse
try to look in Dev settings of your unit. Default password is four eights usually.

olesolo said:
try to look in Dev settings of your unit. Default password is four eights usually.
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Click to collapse
that not help him becouse with those setings u can add or remowe lines for rear camera input not for av in,solution for him is what he ask about some app who have that line layer in video or he need to do properly wired conection from reverse-light + signal to hernes wire (usualy orange named Back) and change the camera input to hernes where is rear cam video input,if is to complicated for him to conect that wire trough car he can do some hardwire with relay conected to car brake wire and plus 12v trough relay contacts to "BACK" wire on the unit or if he satisfied with tha manual way entering the cam he can use just normal switch from 12v to back wire but in all keyses he need to change video input to rear cam video input

Fitting a Reverse camera on a Polo

Hi, I have just received a new head unit, and all is working fine, except I have some confusion on how the reverse camera is suppose to be connected.
There are two parts of the cable, the yellow aux, which goes into the back of the unit, and red aux which is the power. The manual suggests you connect the two wires to the positive and negative wires of the reserve light.
I am not clear on the following.
1. Where exactly the positive and negative wires can be found on the reverse light.
2. Once I find them how to connect them.
I have attached an image they sent me to help with this.
Any advice on this please?
Thanks

Is it a MTCD type unit.
Post screenshot of system info including MCU version