Interfacing XLPOD using aurdino

Greeting Everyone,
I visited a forum Arduino car audio remote control - Troubleshooting - Arduino Forum, I am constructing something similar for my project.

Is it possible to interface the XPLOD or any other stereo system with DAC using the aurdino with HU-05 module?

My project is to interface the car's stereo system by transmiting a profile over the bluetooth, the file would be downloaded from the internet using the uardino ethernet shield , this is also possible I really want to step in the right direction
I have also attached the architecture diagram below
Regards
M.Osama Asif

The chair is an input?

Is there a link to XLPOD and HU-05? Am not familiar with those.

Explaintation of architecture diagram

0)The Project is based on IoT, RFID tags are used as input for unlocking the car's door,adjusting the actuators according the user's profile(it is located at website).
1)There are two users, driver and passenger, the driver sctraches his card RFID tag,the aurdino ethernet shield downloads the profile and then transmits the data over the bluetooth module(HU-O5). Also he uses his thumb reader to turn on the ignition.
2)The seat is adjusted according to the driver,favorite song plays,A.C is turned on and when the passenger arrives he also sctraches his RFID TAG , the back door opens and all preferences change accordingly to the passenger except the driver's seat.

Now I have two questions

1)Is it possible to interface any stereo system(Such as sony's XLPOD) with bluetooth RECIVER(HU-05 PAIR) to shuffle the tracks.
2)Is it possible to login(enter user_name and password) to download a txt file,read it using the ethernet shield?

here are the links to XPLOD and bluetooth module

www.seeedstudio.com/wiki/images/4/48/HC-05_datasheet.pdf