Thread: Renault "Tuner List" Head Unit/CD changer hacking - Controls

Originally Posted by pippolippi

I was confused

No problem. We probably all need some sleep :-)

Well, if you have components to build a circuit similar to mine, I'd advise that you do that first as it's now known to work. That would confirm :
- that you didn't fry your HU
- that your software is working
- that the pinout and wiring are correct

Then why not go the "10K" way for Rx, and if it's still ok, fiddle with the Tx to see if you can make something simpler/cheaper/smaller...

For my part, I'll work on the software to improve the finite state machine and mimic the CDC's bootup sequence.

Originally Posted by Vicne

For the sake of completeness, here's the circuit I'm using. Now finally I think more people (without a CDC) can enter the game :-)

I'm ready very best work! Now I have only 1 question: Where I can find a female connector to connect to HU ???

Thanks very much to all for contribute to Renault and MP3 car forum!

Thanks!

Originally Posted by slimmegane

Now I have only 1 question: Where I can find a female connector to connect to HU ???

As I said, I have found (and tested) two ways of getting one :
- full Blaupunkt extender (useful for me to get both M and F plugs) for 16 EUR in a car audio store (Blaupunkt ref 7 607 621 154).
- eBay : The female connector (+ contacts) costs 5 EUR (+4 EUR S/H for Belgium) at http://stores.ebay.de/ADAPTERSHOP (search on "blau"). Others sell it under the name "mini-iso" but some don't include the contacts.

Originally Posted by nisianp

I bought a radio cd player (model DC 278/62B) with these connections.
I tried to connect the cd player but I couldn’t connect the screen connector from my car to new radio cd.
Does anyone know if I can connect the cd player to my car, and how ?
Please help.

I guess this is off topic, so you might get better advice on a Renault specific forum, but well...
If by "connect the cd player to the car", you mean the power and speakers connectors, I think, yes. But regarding the display (yellow connector), no idea... And no idea if it's absolutely needed or optional.
Try maybe on http://forum.planeterenault.com [fr], http://www.renault-board.de [de], http://www.renaultforum.nl/Forum/ [nl], http://citroenpicasso.org.uk/renault/ [uk]... and I guess there's a greek equivalent but I don't speak the language :-) :-(

Thanks to all, now I can try to find here in local or i will buy from adapter ebay shop Thanks!

Well, it works !

I knew software was easier than hardware :-)

Like for the hardware part, maybe I'm using a hammer to kill flies, but what I did was completely mimic the startup sequence of the original CD changer :
- send BOOTING frames, retrying each one 3 times until I get an Ack, and if I don't receive one, increment the ID and try again 3 times one second later, etc until 10 successive IDs have been tried, then go back to ID=0 and start again.
- once I get an acknowledge, send the RANDOM_STATUS, then the TRAY_STATUS, then the RANDOM_STATUS again and switch to STANDBY mode (1 STANDBY frame every second)
- when I receive a SELECTED_CDC (which I renamed REQ_CD_INFO), reply with fake CD information (10 tracks, 60:00:00 TRT)
- when I receive a START_PLAY, switch to PLAYING state (1 PLAYING frame every second)

All this is in a finite state machine but I'm still not very satisfied of the architecture...

Like for the 10K resistor, maybe we'll soon see that sending only PLAYING frames is sufficient, but for now I prefer having a strong architecture ready to simulate every situation.

Currently, I can start the application, then as soon as I turn the HU on, it accepts to switch to CD Changer position without the actual CD changer being attached, and it displays TR1 CD1.

I'll go further soon, but I really need some sleep :-)

Updated source code is attached, and here's a picture showing the TR1 CD1 display with the original CDC unplugged :-)