Dedicated to providing technical support and solutions for car radio systems
Mazdaspeed333
Hello, from the screenshot you provided, it looks like the update didn’t work because the incorrect firmware was downloaded. I will send you the correct link again. Please open the link and make sure the file name is ‘H815_update_241116.zip’ before proceeding with the update.
[Login to see the link] Thank you for providing the link. I was successful in upgrading to Android13.
However, I’m still having an issue with:
1) The FM radio playing at the lowest volume even if I am streaming music via Bluetooth or Android auto.
2) Not all the buttons on the steering wheel works. Specifically: a) Voice b) Call c) Hang up
I’m not sure if I should post those issues here or under a different section.
Thanks for all your help!
Mazdaspeed333
Hi [Login to see the link],
Thanks for reaching out! I’m glad to hear that you successfully upgraded to Android 13. Regarding the issues you’re experiencing:
1) FM Playing at the Lowest Volume
2) Steering Wheel Button Issue
Please let me know the results so we can assist you further!
Best regards,
-LEO
Leo
Here’s a link to the volume issue:
Login to see the link
In reference to the voice button on the steering wheel, I’m using android auto and long pressing the button has no effect.
For context, I’m using a baud rate of 19200 since the instructions of using a baud of 38400 made all steering wheel controls inoperable.
However, with 19200 the volume up/down and the back/forward works.
Mazdaspeed333
Thank you for your cooperation! Please follow these steps to verify the issue:
Before using Android Auto, tap the back button in the radio interface.
Once the radio is properly exited, test Android Auto again and check if FM audio is still playing.
If the issue persists, please go to Settings > System Settings > Device and send me your current software version. I’ll have our engineers check for any abnormalities.
Regarding the voice button issue:
Please update the following CANbus-related apps** from the App Store and test again:
If the issue still persists after the update, would you be willing to log and send us the protocol data for further analysis?
Steps to enable protocol logging:
Let us know the results after testing, and we’ll be happy to assist further! 
Leo
Hi Leo! I’ve tried what you mentioned in your previous post and I’m still having the same issues.
1) The volume issue is also present when going from FM radio and trying to close it with the back button.
Login to see the link
Here is my software:
2) As for the steering wheel control, I updated the canbus software after the update.
A) I am not able to update canbus list but the others are updated.
B) When I click canbus, it takes me to a screen with only 2 options which does nothing when clicked. Canbus service doesn’t seem to have any selectable items.
Here’s a video:
Login to see the link
3) I believe the issue I’m having is with the canbus not detecting the voice, hang up, and call buttons. Which can be seen with protocol print. I tried to hang up a phone call when I was connected but there is no response.
Login to see the link
I hope the attached videos is helpful to your team. Please let me know if there is anything you need me to check.
Thanks again for all your help!
Mazdaspeed333
Dear Mazdaspeed333,
First of all, we sincerely appreciate you taking the time out of your busy schedule to record videos and capture version information for us. Your cooperation means a lot, and we truly appreciate your efforts.
Secondly, I noticed that even when your device’s volume is set to 2, the sound still seems quite loud. This might be related to the data sent from the CANBUS box to the head unit. I have already forwarded your video to our engineering team for further analysis.
Since today is not a working day, our engineers may not be able to review this issue until tomorrow. We sincerely apologize for the delay and appreciate your patience and understanding.
Once again, thank you for your cooperation and support!
Best regards,
Leo
Mazdaspeed333
Hello
In this case, you will need to manually connect the steering wheel control wire. Bypass the CANbus box and connect the steering wheel control wire directly to the head unit. Then, go to the “SWC” settings and learn each button.
The advantage of this method is that you can customize the function of each button on the original steering wheel.
Wiring Instructions:
On the 20-pin connector of the CANbus box, locate pin 9. Disconnect it so that it does not enter the CANbus.
Then, connect this wire to KEY1 or KEY2 on the 16-pin power cable.
After connecting, go to the SWC settings and match each button.
See the diagram below for further details.
Let me know if you need any further adjustments!
Apologies for the wait, and thank you for your patience!
Leo
Login to see the link
Here is a newly compiled firmware version from our engineer. Please try updating the firmware and verify if the issue is resolved after the update.
Leo
Thanks for the quick response and all your time with this matter!
1) For for the software update, I am still experience the radio playing softly in the background. Please see video: Login to see the link
I’ve also noticed that the option to change the vehicle speed from km to miles is now missing and I am unable to change the setting. I also updated the 3 canbus apps (canbus, service, and list).
2) I spliced the wire per your instructions and connected pin 9 to key1.
This now allows me to program the buttons in SWC which I was not able to do previously but only for the same buttons that were working before (volume, fwd/back, mode). It does not resolve the original problem with the voice, hang up, and answer buttons.
I also tried connecting to the SWC2 (key2) wire but I have the same symptoms.
I experimented with the different baud rates to see if it would resolve the issue. I am able to the use the same working buttons under 38400 baud. However, the 19200 seems to work better because it is able to sense open doors and HVAC control.
Mazdaspeed333
Dear Mazdaspeed333,
We sincerely apologize that the previous solutions did not resolve your issues.
Regarding the FM background sound issue:
The new system upgrade we previously provided did not solve the problem. After further communication with our engineers, it seems that if the system upgrade doesn’t resolve the issue, the problem is likely with the radio chip.
If you have time, could you please capture a system log and send it to us for further analysis of the issue? If it turns out to be a chip (hardware) problem, please feel free to contact us at our official email: [Login to see the link], and we can arrange for a replacement.
Regarding the voice button, answer, and hang-up issues:
First, I have asked the engineers to carefully review the protocol data video you sent, and they confirmed that the original car is not sending any voice data to the head unit.
Additionally, I have discussed with the engineers about the situation where manually wiring the buttons did not resolve the voice issue.
Typically, the original car’s steering wheel control buttons are connected via a signal wire (either key1 or key2), and pressing each button generates different resistance values to trigger different functions.
If you have a multimeter, you can test it this way:
Set the multimeter to DC 20V.
Connect the black probe to the ground.
Connect the red probe to key1 (if you’re currently using key2, connect the red probe to key2).
Press the voice, answer, and hang-up buttons and check if there’s any voltage change.
If no voltage change is detected when pressing the buttons, unfortunately, it seems the issue cannot be resolved.
We apologize for the inconvenience and thank you again for your cooperation. Please let us know the results of the testing, and feel free to contact us if you need any further assistance!
Best regards,
Leo
Mazdaspeed333
Additionally, could you please provide a picture of the back of your car’s original head unit? This will allow me to take the time to look up the pinout diagram for your vehicle model and confirm whether there are two steering wheel control signal wires. If so, you can connect them to key1 and key2, which should resolve the issue.
Thank you for your cooperation, and I look forward to your reply!
[Login to see the link]
Here is a the back of my original deck:
FYI, this is the original Bose deck. I currently do not have anything plugged into the right plug as I think that goes directly to the Bose amp (but I’m not 100% sure).
I measured the voltage from key1 and key2 to ground. There was no change in voltage when any button was pressed, including the ones that are working (volume/seek/mode). It was a constant 2.8V on both wires.
Just a reminder that the buttons worked before I spliced into key1/key2 but I was not able to program it using SWC. Just a thought, but I think it might be getting another signal somewhere else.
As for the system log, I’m unable to locate where I can download it. Can you point me to where it can be found?
Thanks again for all your help and effort!
Mazdaspeed333
Thank you very much for providing the photo! Please give me a moment, I will check the pinout definition of the head unit and get back to you as soon as possible.
Additionally, I believe your assumption is correct—the voice button and the other two buttons are likely routed through a different signal group.
1.Open the calculator and enter “）83781（”, then press “=”.
2.Once in the debug interface, click on the “DEBUG&LOG” option.
3.Click on the “YLOG” option and select “NORMAL SCENE” (it will turn blue).
4.Reproduce the issue (e.g., When entering the radio app to play FM, then pressing the “Back” button in the top right corner, the issue is that the FM sound continues after exiting the app.).
5.Afterward, repeat steps 1 to 3, but click on “DEBUG&LOG” again (it will turn gray).
6.Go to the file manager, find the “YLOG” folder, copy it, and send it to us for analysis.
Mazdaspeed333
Hello,
I’ve reviewed the original car’s pinout information, and I believe I have identified the issue.
Under normal circumstances, there should only be two steering wheel control signal wires from the original car: one is “SWC”, and the other is “SWC GND”. However, it seems that your car has additional buttons for voice, answer, and hang-up, which I believe should be routed through “SWC2”. The SWC GND should share a common ground with the original car’s head unit ground.
The attached image is the 24-pin pinout of your original head unit.
Please check pins “H” and “I”—these are the steering wheel control signal wires from the original car.
The correct wiring should be as follows:
H corresponds to KEY1
I corresponds to KEY2
Please check and connect them in this manner, then proceed with the button learning process again.
Note:
Currently, the wiring shows that the original “I” pin is connected to our power harness GND.
Please cut the wire corresponding to the “I” pin (the wire from our power harness, usually black). After cutting, check if the volume up and volume down buttons are functioning correctly.
If they are, then reconnect the “KEY2” wire to the original “I” pin and proceed with the button learning process again.
[Login to see the link]
Thanks for the instructions! I’ll download the logs and re-wire the connections. I will report back with the results in a few days when I have time to complete it.
Mazdaspeed333
Thank you for your reply! I appreciate your cooperation, and I completely understand that it may take some time to complete the process. Once you’ve downloaded the logs and re-wired the connections, please feel free to let me know the results when you have time. If you need any further assistance, don’t hesitate to reach out.
Looking forward to hearing from you!
Leo
Hi Leo,
I’ve had some time to try out the connections you mentioned but unfortunately, they did not work. However, I was able to figure out the correct wiring.
For models with bluetooth, the SWC2 wire goes to the bluetooth module. The pink wire needs to be cut and connected to the key2 (SWC2) wire of the head unit. Hopefully, this info can help out anyone in the future trying to figure it out.
As for the log capture, here’s the ylog: Login to see the link
Mazdaspeed333
Hi Mazdaspeed333,
Thank you for sharing the information, and I appreciate your effort in figuring out the wiring! I see that you’ve connected the SWC2 wire to the Bluetooth module, and the pink wire needs to be cut and connected to the key2 wire of the head unit. This is helpful and will surely assist others with similar setups in the future!
Also, thank you for providing the log file. I will have a look at it and get back to you shortly if we need any further details.
Let me know if there is anything else you need assistance with!
Best regards,
Leo
Mazdaspeed333
Hello Mazdaspeed333,
We have reviewed the YLOG data you provided. It appears that the issue may be caused by the radio chip. Please contact us at our official email address: [Login to see the link], so we can arrange a replacement unit for you.
We sincerely apologize for any inconvenience this may have caused and wish you a wonderful day.
Best regards,
LEO
