Thanks gonza for your post.
Im form Argentina too ans have a Suzuki Swift 1.5vvt.
The cable works fine, but Ive noticed that the right channel sounds rare, like no voice.
So I decided to interchange the ground and left channel and.... works perfect!!!!!!.
Here is my modification:
in this diagram of conexions
the audio left pin must be GROUND and the ground must be AUDIO LEFT.
Thas all....
Sounds great!!