Hallo i'm new to this forum so thanks you for your patience.

I have Mazda 6 2003 with the old factory stereo.
After a bit of google i found and bought this product:
Car Audio Interface, wt-usb01


PROBLEM:
I installed it correctly, when my car is ON and an USB dongle is NOT connected i see the GREEN LED ON on the PLUG, and when i connect i see the GREEN LED BLINKING, as it should when the aux mod is reading data.
BUT if i press AUX button on my CAR STEREO it simply does nothing, no usal BEEP no changing in CAR STEREO DISPLAY.

Have you any clue on this? i i've been to vague please ask me to be more specific, my work is IT Tech so i can be


Thank you for your time
Info on the aux mod
CD MP3 USB Interface Car Adapter Aux Input Honda Toyota Mazda Hyundai Nissan Etc | eBay

Pdf instructions
http://www.wiiki-tech.com/pic/201403201701496634.pdf