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Hello all,
I replaced the original BMW Professional car radio with a MTCB MX RK3066 head unit. Everything works fine except that the front parking sensor is no longer working, it does not beep anymore (The REAR one is still working/beeping) . They (Both front and rear) used to work fine with the original BMW Professional car radio.
1 ) Is there a way to fix this front parking sensor problem?
2) Is there a way to use a third party android app to display visually the distance on the MTCB MX RK3066 unit instead of hearing the beeps only?
Thanks in advance
Guys,
Any advice will be highly appreciated...
sayborg said:
Hello all,
I replaced the original BMW Professional car radio with a MTCB MX RK3066 head unit. Everything works fine except that the front parking sensor is no longer working, it does not beep anymore (The REAR one is still working/beeping) . They (Both front and rear) used to work fine with the original BMW Professional car radio.
1 ) Is there a way to fix this front parking sensor problem?
2) Is there a way to use a third party android app to display visually the distance on the MTCB MX RK3066 unit instead of hearing the beeps only?
Thanks in advance
Click to expand...
Click to collapse
http://automotive.paser.it/en/p/298/SlimKey_PDC/
sayborg said:
Guys,
Any advice will be highly appreciated...
Click to expand...
Click to collapse
You should check with your HU seller for the availability of a CANBUS decoder for your car/HU combination. The CANBUS decoder will allow the headunit to access all CANBUS info - parking sensors, door switches, air conditioning settings, etc.
My car has the original factory Parkpilot system, I bought an Android unit px5 MTCE_KSP_2.70 with Android 6.0.1 I would like to know if it is possible to make when the parking system is activated you see the car something bigger, if it can be that occupies the entire screen as in the original system. And also if it is possible to make the symbol of the car activate forward, as in my original system, the car has radar and is able to detect a front obstacle but the car symbol only appears when I go backwards.
Thanks I hope your answers.
I have the same problem with px5,
rear sensors works good, when the reverse gear is on, then i have view from back camera and see the visualistaion of rear parking sensors.
But front sensors the havent apper on lcd.
The visualisation of front sensors i have only with reverse gear is on, but is not the solution...
I have a contact with Joying, and they works about this problem.
lyczko said:
I have the same problem with px5,
rear sensors works good, when the reverse gear is on, then i have view from back camera and see the visualistaion of rear parking sensors.
But front sensors the havent apper on lcd.
The visualisation of front sensors i have only with reverse gear is on, but is not the solution...
I have a contact with Joying, and they works about this problem.
Click to expand...
Click to collapse
Please if you see some solution post it here. I will doing the same. Thx.
Enviado desde mi HT20Pro mediante Tapatalk
Silver_ said:
Please if you see some solution post it here. I will doing the same. Thx.
Enviado desde mi HT20Pro mediante Tapatalk
Click to expand...
Click to collapse
Same problem for me.
Hi,
do you have any solution for this?
What is your brand of a car?
lyczko said:
Hi,
do you have any solution for this?
What is your brand of a car?
Click to expand...
Click to collapse
My brand is Seat, Wolkswagen group
Enviado desde mi HT20Pro mediante Tapatalk
ok, i have citroen, so it have other can adapter.
I think it is only the software problem, because on reverse gear front sensors works, so the head unit have signal...
i think about special app which after you open it, it shows You the same car silhoutte like when it is on the reverse gear.
I know it isn't a solution but it could be the easiest way to see the front sensors information.
lyczko said:
ok, i have citroen, so it have other can adapter.
I think it is only the software problem, because on reverse gear front sensors works, so the head unit have signal...
i think about special app which after you open it, it shows You the same car silhoutte like when it is on the reverse gear.
I know it isn't a solution but it could be the easiest way to see the front sensors information.
Click to expand...
Click to collapse
Not only software problem my friend, in my case I have a canbus decoder that dont interpret correctly when the car goes fordward and the radar sensors detect an obstacle. It only interpret when I put the gear back and in that moment it active the car parkpilot on screen. My only solution I think is to have a more compatible canbus for my car. I think that chinese canbus are very generic.
Here is the newest info from Joying:
"For the front parking sensor we are sorry for it, last year when we test the canbus adapter in a citroen car, that Citroen car without the front parking sensor, and we also no dot aware of this issue. So just made a canbus adapter which not compatible with the front parking sensor, now we already know this issue and we will try to test it again and solve it in the near future, sorry for the inconvenience"
lyczko said:
Here is the newest info from Joying:
"For the front parking sensor we are sorry for it, last year when we test the canbus adapter in a citroen car, that Citroen car without the front parking sensor, and we also no dot aware of this issue. So just made a canbus adapter which not compatible with the front parking sensor, now we already know this issue and we will try to test it again and solve it in the near future, sorry for the inconvenience"
Click to expand...
Click to collapse
That is good news, at least they are in it. Thanks lyzko for the news.
Hi,
I have an Android 5.1 .1 unit with RK3188 chip 1G RAM. All works well but there is a weird rear camera issue. When I start the car and switch to backup gear, the rear camera always works normally, however, after driving 10 minutes or longer the camera does not work anymore and the screen shows an exclamation mark when gear switched to backup. This happens approximately 80% times, while the other 20% times the camera would work OK even after long driving time.
The camera is wired normally with power connected to backup light. Backup light power is also connect to the head unit as trigger for rear camera video.
I was initially thinking this could be a bad camera issue, but the problem persists after installation of a new camera. So it must be the unit.
Has anyone else experienced similar problem? Any help to fix the issue is much appreciated.
yves31 said:
Hi,
I have an Android 5.1 .1 unit with RK3188 chip 1G RAM. All works well but there is a weird rear camera issue. When I start the car and switch to backup gear, the rear camera always works normally, however, after driving 10 minutes or longer the camera does not work anymore and the screen shows an exclamation mark when gear switched to backup. This happens approximately 80% times, while the other 20% times the camera would work OK even after long driving time.
The camera is wired normally with power connected to backup light. Backup light power is also connect to the head unit as trigger for rear camera video.
I was initially thinking this could be a bad camera issue, but the problem persists after installation of a new camera. So it must be the unit.
Has anyone else experienced similar problem? Any help to fix the issue is much appreciated.
Click to expand...
Click to collapse
modern car? possibly smart power management and therefore not sending enough power to the camera as it detects the reverse light not needing that much power. my vw golf does it and my friends bmw 1 series did, if its wired to a switch 12v does it do the same?
fma965 said:
modern car? possibly smart power management and therefore not sending enough power to the camera as it detects the reverse light not needing that much power. my vw golf does it and my friends bmw 1 series did, if its wired to a switch 12v does it do the same?
Click to expand...
Click to collapse
Thank you, fma965. That makes sense.
The car is 2013 Prius. I did not realize cars are getting much smarter since last few years. 12v can come down a lot to save energy. I'll try to rewire the power connection.
yves31 said:
Thank you, fma965. That makes sense.
The car is 2013 Prius. I did not realize cars are getting much smarter since last few years. 12v can come down a lot to save energy. I'll try to rewire the power connection.
Click to expand...
Click to collapse
you may need to use a relay to detect when reverse light is on then trigger camera via 12v connection (elsewhere) otherwise the camera will be always on
yves31 said:
Thank you, fma965. That makes sense.
The car is 2013 Prius. I did not realize cars are getting much smarter since last few years. 12v can come down a lot to save energy. I'll try to rewire the power connection.
Click to expand...
Click to collapse
http://www.halfords.com/workshop-to...fixings/halfords-hef554-relay-12v-30amp-4-pin is what i've used (UK)
12v cigareete lighter / battery to 1 pin, gnd to another pin, camera to the 3rd pin and the reverse light power to the 4th pin (not in that order)
fma965 said:
http://www.halfords.com/workshop-to...fixings/halfords-hef554-relay-12v-30amp-4-pin is what i've used (UK)
12v cigareete lighter / battery to 1 pin, gnd to another pin, camera to the 3rd pin and the reverse light power to the 4th pin (not in that order)
Click to expand...
Click to collapse
Thanks. I ordered a 12v/30amp/4pin relay and will install according to your instructions when it arrives.
fma965 said:
http://www.halfords.com/workshop-to...fixings/halfords-hef554-relay-12v-30amp-4-pin is what i've used (UK)
12v cigareete lighter / battery to 1 pin, gnd to another pin, camera to the 3rd pin and the reverse light power to the 4th pin (not in that order)
Click to expand...
Click to collapse
Relay came yesterday and I installed it. Pull cigarette lighter as 12v power source, wired to the relay switch, and connected rear light cable to relay as trigger.
To my surprise, the problem of video still persists! I can get rear camera video when starting the car, but loss video ~10 minutes after driving when shifting gear to reverse.
I made sure the relay wired correctly (If connected wrong, I would be either stuck in permanent rear camera video or no video after shifting to rear gear). I changed video cable as well to be sure no cable issue. Also noticed that when the problem appears, I have to wait for the head unit to shutdown completely (not to sleep mode) in order to get video back from rear camera.
Not sure if this is MCU bug. The problem started since I had the unit and MCU got updated once. I'll update one more time to see if anything changes.
yves31 said:
Relay came yesterday and I installed it. Pull cigarette lighter as 12v power source, wired to the relay switch, and connected rear light cable to relay as trigger.
To my surprise, the problem of video still persists! I can get rear camera video when starting the car, but loss video ~10 minutes after driving when shifting gear to reverse.
I made sure the relay wired correctly (If connected wrong, I would be either stuck in permanent rear camera video or no video after shifting to rear gear). I changed video cable as well to be sure no cable issue. Also noticed that when the problem appears, I have to wait for the head unit to shutdown completely (not to sleep mode) in order to get video back from rear camera.
Not sure if this is MCU bug. The problem started since I had the unit and MCU got updated once. I'll update one more time to see if anything changes.
Click to expand...
Click to collapse
What MCU manufacturer and what version? i'm on KGL crossflashed to HA
fma965 said:
What MCU manufacturer and what version? i'm on KGL crossflashed to HA
Click to expand...
Click to collapse
It's MTCD_KD_V2.41_1, and is already the latest version. I'll try to flash other manufacturer's MCU since most of them are compatible.
Prior to flashing, I should start by erasing current MCU settings and set to defaults. Do you know the best way to do so?
Edit:
MCU flashed to HA-2.52, but problem not changed. Seems to be a hardware issue, or compatibility issue with Prius.
I tried to wire rear camera to front video input. Image did show up, but I had to press a button each time when switching to back gear. I may have to live with the issue.
Strangely enough I have a 2010 Prius and yes I have a similar issue. Mine works almost always, but if I switch to reverse, then back to any gear, then back to reverse, more then 5-6 time during a minute, then I have the same as you. I'm pretty sure we have the same cause. If I reboot the unit everything is ok. Our situation is definitely different to the german cars as they have a detection circuit for failed bulb and that is the reason for their issues. Ours don't have that, at least ZVW30 Prius. I doubt it's the power or the camera. That is the unit itself and as you say probably poor hardware design.
Agree with you.
Additional note:
I had some issues after cross flashing MCU. Lost RDS in radio and iGo became very slow. Now I flash original KD MCU back and everything got back to normal. Cross flash MCU may not be always a good idea.
Hi you solved?
Mine do the same..its another car...more strange that mine works fine before i change battery...after that start with problems...
It switch but take 5 mins at least...
I rewire.put relay.put direct 12 and nothins..sometimes it works at second..bit after nothings....
Any help?
Thanks
Hello,
I had the same issue and check voltage. For an insane reason, the wire provided with the radar kit was totaly failing.. measured voltage was around 5 volts whereas camera required 12v ( i though to the USB volatge first, but, no!). This red&black wire, i don't known how, went to a huge resistance... may be pinch. I change for good power wire and throw away the bad one. My rear camera get back...
Bruno
yves31 said:
Thank you, fma965. That makes sense.
The car is 2013 Prius. I did not realize cars are getting much smarter since last few years. 12v can come down a lot to save energy. I'll try to rewire the power connection.
Click to expand...
Click to collapse
I'm looking for someone who knows how to rewire. You guys know a good place?
The Dasaita V600 does not switch on the rear view camera until the multimedia is turned on. the front parking camera displays immediately. the rear parking camera motor does not work until the dasaita v600 main screen is turned on What could be the reason? this is very bad. the car is running, the rear camera does not display images for 35 to 40 seconds until multimedia is turned on. the front parking camera gives the image immediately without waiting. There is no such problem for the multimedia of other brands. I thought of it as a software
Help Me
does every user have the same problem? the park camera will not work to start the car and move back and forth immediately. Wait for 40 seconds to turn on and then move on. this is ridiculous.
muratemre444 said:
The Dasaita V600 does not switch on the rear view camera until the multimedia is turned on. the front parking camera displays immediately. the rear parking camera motor does not work until the dasaita v600 main screen is turned on What could be the reason? .
Click to expand...
Click to collapse
Faced this issue on my Dasaita HA2021-V600 but in my case a little work on canbus wires solved the problem.
Looking at connection diagram on top of your head unit you need to search a wire named "Reverse", in my case the wire the nr. 2 in orange color.
This wire in directly connected to canbus box; cut that wire and connect it from head unit side to +12V from reverse lamp.
After that you will see immediatly camera images when you put your car in reverse gear.
Now my turn for a question: what type of front camera are you using and how you have connected it to head unit and which harness you have used?
Hope my suggestion can help you
P.S.: Make that at your risk, im not responsible for whatever damage on your unit with my "mod".
iRcKenny said:
Faced this issue on my Dasaita HA2021-V600 but in my case a little work on canbus wires solved the problem.
Looking at connection diagram on top of your head unit you need to search a wire named "Reverse", in my case the wire the nr. 2 in orange color.
This wire in directly connected to canbus box; cut that wire and connect it from head unit side to +12V from reverse lamp.
After that you will see immediatly camera images when you put your car in reverse gear.
Now my turn for a question: what type of front camera are you using and how you have connected it to head unit and which harness you have used?
Hope my suggestion can help you
P.S.: Make that at your risk, im not responsible for whatever damage on your unit with my "mod".
Click to expand...
Click to collapse
Hello. To attach the front camera to the car, first go to the factory settings. Activate the camera in the last section there. how many secs you want to see. then buy and install any front rear camera.
Place the cable in the D. aux in glass on the device. now the front camera will help you when you leave the back cabin during each parking.
Thanks for your reply, but i dont understand what you said in:
muratemre444 said:
Place the cable in the D. aux in glass on the device.during each parking.
Click to expand...
Click to collapse
Can you explain better please?
Now your rear camera is working right?
iRcKenny said:
Faced this issue on my Dasaita HA2021-V600 but in my case a little work on canbus wires solved the problem.
Looking at connection diagram on top of your head unit you need to search a wire named "Reverse", in my case the wire the nr. 2 in orange color.
This wire in directly connected to canbus box; cut that wire and connect it from head unit side to +12V from reverse lamp.
After that you will see immediatly camera images when you put your car in reverse gear.
Now my turn for a question: what type of front camera are you using and how you have connected it to head unit and which harness you have used?
Hope my suggestion can help you
P.S.: Make that at your risk, im not responsible for whatever damage on your unit with my "mod".
Click to expand...
Click to collapse
Hi,
I am having quite the same probem with my dasaita.
when I switch to reverse I can only see a black screen with the green guides and a sort of yellow alert.
Can you tell me the color of the +12V reverse lamp wire? did you find it behind the unit or you cought that +12v from the reverse bulb behind the car?
thank you
Mirko
MirkoCrb said:
Hi,
I am having quite the same probem with my dasaita.
when I switch to reverse I can only see a black screen with the green guides and a sort of yellow alert.
Can you tell me the color of the +12V reverse lamp wire? did you find it behind the unit or you cought that +12v from the reverse bulb behind the car?
thank you
Mirko
Click to expand...
Click to collapse
If you are facing that issue you simply need connect the yellow RCA cable from you rear camera to the right RCA connector in your head unit, you dont need perform any modification on HU wires; that RCA wire is usually labeled CAM-IN or Rear-IN. Check you connection
Also if you connection are OK the camera is not supplied with +12V and you need use the wire that come from the reverse lamp
iRcKenny said:
If you are facing that issue you simply need connect the yellow RCA cable from you rear camera to the right RCA connector in your head unit, you dont need perform any modification on HU wires; that RCA wire is usually labeled CAM-IN or Rear-IN. Check you connection
Also if you connection are OK the camera is not supplied with +12V and you need use the wire that come from the reverse lamp
Click to expand...
Click to collapse
I tried that already. I think it's a problem with the cables. I contacted the Dasaita Support and suggested to work on 2 pins of the canbus.
thank you
MirkoCrb said:
I tried that already. I think it's a problem with the cables. I contacted the Dasaita Support and suggested to work on 2 pins of the canbus.
thank you
Click to expand...
Click to collapse
Not a probl with canbus. The only problem that canbus can do is "not switching on reverse gear". When you see the yellow "!" mark on screen mean that unit is not receiving video signal from camera.
Try this for checking the camera: connect the yellow RCA cable from reverse camera to AUX-Video IN harness and use AVIN app if you see images the camera is OK if not you need to check camera connections.
Cable 2 from canbus trigger only the "rear view" if the unit is not switch to reverse input.
What are the canbus setting on you factory setting menu? you car is an E46? what type of main connector are you using 17 or 40 pins?
iRcKenny said:
Not a probl with canbus. The only problem that canbus can do is "not switching on reverse gear". When you see the yellow "!" mark on screen mean that unit is not receiving video signal from camera.
Try this for checking the camera: connect the yellow RCA cable from reverse camera to AUX-Video IN harness and use AVIN app if you see images the camera is OK if not you need to check camera connections.
Cable 2 from canbus trigger only the "rear view" if the unit is not switch to reverse input.
What are the canbus setting on you factory setting menu? you car is an E46? what type of main connector are you using 17 or 40 pins?
Click to expand...
Click to collapse
ok will try.
I don't know my car type..it's a Nissan Qashqai
problem solved
problem solved. the original camera was removed and replaced with another camera. electric power was taken as 12v from parking light. As the original camera was 6v and powered from the unit, the rear camera was not working until multimedia was turned on. everything works fine now
Max 6 wrx rear camera
I am having the same issue on my 2018 wrx limited. When I put it in reverse I get the yellow ! Or see a black screen with the guides. If I go to the AV in , I am able to see the reverse camera image. I have the Dasaita Max 6 (px6). Any assistance would be amazing!
zimbelj said:
I am having the same issue on my 2018 wrx limited. When I put it in reverse I get the yellow ! Or see a black screen with the guides. If I go to the AV in , I am able to see the reverse camera image. I have the Dasaita Max 6 (px6). Any assistance would be amazing!
Click to expand...
Click to collapse
Try plugging the reverse camera into the reverse camera input?
marchnz said:
Try plugging the reverse camera into the reverse camera input?
Click to expand...
Click to collapse
I tried that and tried every combination that I could think of with the Various RCA cables - just the yellows, all the rca connections, the different yellows. I think it may in an issue with whatever wire from the car that triggers the camera when it is put in to reverse.... I read somewhere that the harness provided from Dasaita may have an empty pin hole where that wire should be. I am not savvy enough to know. Thanks for taking time to try and assist. Any other tips to try? could this be a voltage issue?
muratemre444 said:
Hello. To attach the front camera to the car, first go to the factory settings. Activate the camera in the last section there. how many secs you want to see. then buy and install any front rear camera.
Place the cable in the D. aux in glass on the device. now the front camera will help you when you leave the back cabin during each parking.
Click to expand...
Click to collapse
I dont understand this. I also have android PX3, Back camera works as I put in reverse. Connected front camera tu AVIN, settings set to "enable front camera for 15sec after reverse". But I only see black screen.
When Manually open AVIN I see front camera, how do I enable this?
Thanks
Hello,
ich had also problems with the rear cam and that's what solved the problem in my case!
https://forum.xda-developers.com/an...s-general/wired-rear-cam-issue-fixed-t3964902
Best regards
Hi there everybody,
I recently noticed my PX6 unit doesn't see any of the front / rear cameras. With all wires connected the f-cam app shows the orange triangle (no signal) for both front and back cameras. The same happens if I give a 12v signal to the reverse (pink) wire.
I never got to install the backup camera in my car but I did bench tests with a power source and had the cameras working when I first got the unit. Now, a few months later, the cameras simply don't work
I tested with 2 different cameras and also with a DVD player and none worked.
I even opened the unit and checked the motherboard to see if there is a fried circuit or IC...and saw nothing. The video inputs lead to a IC labeled "FMS6502" and the signal gets to it through a 75ohm resistor and a capacitor which both look okay.
What can it be?
Please give me your opinions on this as it drives me crazy !
Thank you!
I would guess your headunit is not providing the 12 volts to both cameras
Hi , I remember your Fcam app requires you to connect your front view camera to your f cam video input and provides thru another lead a 12 volt output in which you can conect the power for both your front and rear camera. If both cameras dont work most possible the radio is not providing the 12 volt output .
cflaviu said:
Hi there everybody,
I recently noticed my PX6 unit doesn't see any of the front / rear cameras. With all wires connected the f-cam app shows the orange triangle (no signal) for both front and back cameras. The same happens if I give a 12v signal to the reverse (pink) wire.
I never got to install the backup camera in my car but I did bench tests with a power source and had the cameras working when I first got the unit. Now, a few months later, the cameras simply don't work
I tested with 2 different cameras and also with a DVD player and none worked.
I even opened the unit and checked the motherboard to see if there is a fried circuit or IC...and saw nothing. The video inputs lead to a IC labeled "FMS6502" and the signal gets to it through a 75ohm resistor and a capacitor which both look okay.
What can it be?
Please give me your opinions on this as it drives me crazy !
Thank you!
Click to expand...
Click to collapse
Megv6265 said:
Hi , I remember your Fcam app requires you to connect your front view camera to your f cam video input and provides thru another lead a 12 volt output in which you can conect the power for both your front and rear camera. If both cameras dont work most possible the radio is not providing the 12 volt output .
Click to expand...
Click to collapse
What. You've just said, connect the front and rear camera and the +12v feed. The headunit doesn't provide a 12v output for the cameras.
Not surprised at the guess, these topics generally are guessing games.
I'd suggest finding a skilled car audio tech or auto electrician. That's not meant to be an oxymoron, seriously
Hi.
I recently bought an MTCE PX5 based head unit for my french Peugeot 308 (2009).
The manufacturer seems to be Klyde as the version number (MTCE_KLD_V2.88b_1) says.
The installation in the car was pretty easy and plug & play thanks to your help on the main PX5 thread.
Still I have a few questions that you might have answers for
First, the head unit sounds pretty crappy.
My previous Parrot Aseroid Smart (slowish Android 2.3 / 512 MB) had a way much better sound output quality.
I will try to flash one of Cs-x's sound patchs, see if it goes better with that update.
The main problem comes from a lot of noises I get from the head unit "gzzzz" "pshhhh", it reminds me of the good old times with the computers ****ty front panel audio
When I call someone, they barelly hear me. Have you guys been experiencing such noises ?
--> Fixed by flashing one of Cs-x's patched firmwares
Then there are my rear sensors.
They are successfully detected and provided to the head unit by the CANBUS decoder provided by the seller, but they don't beep !
The seller didn't provide the amplified external speaker needed so I must do it the DIY way...
I managed to solder RCA connectors to that audio signal and I can hear the beeps when I switch for AV1 on the unit : good... but my back camera is connected to the CAM1 input wich is automatically displayed when I engage the reverse gear.
Is there a way to ask my head unit to switch to AV1 instead of CAM input when I engage reverse ?
That would be perfect as I will get the video from the back camera AND the audio from the sensors !
An other issue : my car's service counter is going crazy !
As I drove a few meters, the service counter droped near a thousand kilometers since next service.
This will result in service light flashing in a few days, for at least 12 month until my next real service :
Any idea ?
Thanks in advance for your help.
Damien
Ok guys, I managed to fix my first issue simplt by flashing one of those Cs-x sound patched firmwares !
Thanks for that !
Any advice for getting sound & video for ma rear sensors & camera ?
Bump, any idea ?
I got an other big issue with my canbus decoder...
See first post (photos), my service odometer seems to freak out a bit
Interesting as I just looked at this company for one for my Mazda CX7..
Just sent them an email on it..
Want the 4meg 32g version..
Seems also while they work with the Bose system already the reverse cam that comes with the car may not work.. need to confirm..
Hi Dgcruzing
Did you have any response from Belsee ?
Usually they answer within 2 days.
Yes, they popped back an answer.
But ended up going with a Dasaita.
Seems plenty of resellers of thier unit across the usual channels.. so with luck it all goes to plan..
Rear sensors
I have a Peugeot 208 and Dasaita unit, so slightly different and this may not help. But I had issues with reverse sensors and did not realise I had to install the supplied speaker. The beeps from the reverse sensors do not come out of the main speakers in the car, only the extra speaker provided.
Thanks Downerhouse for your message.
Indeed, my unit has this connector too, but there was no speaker in shipped the box
I tried many speakers and piezzo buzzers, but none of them worked.
I managed to attach a RCA connector to this output so I could at least plug the rear sensors sound output into my AUX input... but that's really not practical...
Bump
New ideas.
I read in a french forum that I could easily modify the car's ECU so the rear parking sensors output directly through the cars COM2000 (that's the direction switch, behind the steering wheel) instead of the classical audio circuit. I will check this.