Car Radio Help Center

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Mazda3 firmware

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!

Mazdaspeed333

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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!

Leo

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.

Here’s how to capture the logs:

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.

Leo

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.

Mazdaspeed333

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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.

Leo

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!

Mazdaspeed333

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

Leo

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

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

Mazdaspeed333

Leo

Hi Leo, I’ve sent an email to the address above but I have not received a response.

Regards,

Cliff

Leo

Mazdaspeed333
Hello Cliff,

I sincerely apologize for the delayed response. I will check the email and follow up as soon as possible. To expedite the resolution of your issue, could you please provide your order number?

Thank you for your patience.

Best regards,

Leo

Mazdaspeed333

Leo Leo, I added the order number in my email.

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