wt-usb01 (aux mod) on my Mazda 6 2003 >>> PROBLEM

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Mazda 6 2003
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
$_57.JPG


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?
if 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
 
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