Hi! I just recently purchased a 2020 Mazda 3gx in Canada. I am trying to get information to hook up a spare tire subwoofer with built in amp in the trunk but I have been having no luck in finding the wiring diagrams. Anyone added a sub to their 2020 yet? If so please let me know thanks in advance

 

Is you MAZDA a BOSE system?

 

No unfortunately it's just the stock system. My model is the GX so it's just base

 

***I am quoting myself and you for this response.


*For none BOSE system I looked at ALLData and there is no speaker wiring code available yet. Grim_Reaper may have some info should he read this thread.
It is so simple to find the speaker polarity even while in the car with a couple of wires and a 9 volt battery. Look on the internet and use:

Checking for Positive & Negative on a Speaker (Speaker Polarity)

WARNING:
MAZDA 2019-2021 with factory BOSE sound system consult with the technical departments of aftermarket stereo components before installing them.

 

I no longer have home access to online Mazda workshop manuals. Don't know when I will be back at work. ( Soon hopefully)