Renault "Tuner List" Head Unit/CD changer hacking - Controls - Page 30

e888boo · 03-19-2006, 12:26 PM

Hi

I hope this isn't considered too off topic for this thread, I apologise profusely if it is but...

I've got a VRNX001 for my Clio Tuner List HU, connected the cable and tested, all worked fine...

Finished up the installation and then it didn't work anymore, so I got a replacement and all replacement cables too and this one isn't recognised by the HU at all, but the first one was at first...

Any suggestions, can the HU be reset?, if so how? The cables are so short behind it I can't get them out!

It's driving me crazy now , I don't know of any other options for using my iPod in the car only rubbish FM transmitters.

Please help!!!

e888boo · 03-20-2006, 09:04 AM

The plot thickens...

I tried the unit today on a friend 2005 Update List HU and it worked perfectly, but still not on mine.

I unplugged the power but it doesn't appear to have reset the HU as the radio saved stations are still there as are my bass/treble settings.

I have a 182 so have the Cabasse version of the stereo which I belive is more powerful than a standard HU, and replacement Renault HU's are verrry expensive, but I don't want to have to buy another as it appears to work OK.

I believe the stereo is out of warranty after the first year is this true? My car will be 2 in May dammit!

I'm totally stumped and peed off now!

peppuz79 · 03-20-2006, 10:12 AM

Quote: Originally Posted by e888boo

I believe the stereo is out of warranty after the first year is this true? My car will be 2 in May dammit!

I'm totally stumped and peed off now!

Hi,

if you are able, try to disarm the chassis of your HU, maybe some short circuit have 'cut off' some wire around the 13/14 pin.

let me know.

bye
peppe
p.s. I have had the some problem , but lucky for me the wire connected to the pin 13 has worked like fusible.

e888boo · 03-20-2006, 10:23 AM

Could you explain a bit clearer, or do a diagram so I can see what to do...

You must forgive me but I'm a bit new to all this

Which plug/socket is the pin on?, the HU CDC socket? or the Connects 2 plug that goes into the CDC socket? and which pin is 13/14?

Do you mean there could be a problem within the HU itself?

Sorry to be a pain!

I appreacite the help very much!

peppuz79 · 03-20-2006, 10:34 AM

Quote: Originally Posted by e888boo

Hi

I hope this isn't considered too off topic for this thread, I apologise profusely if it is but...

Hi,

can you move your discussion in other thread you are too off-topic.

thanks
pep

e888boo · 03-20-2006, 10:49 AM

Sorry, original help request is here...

http://www.mp3car.com/vbulletin/show...hlight=vrnx001

Apologies

pippolippi · 03-20-2006, 01:19 PM

Here's a simplified circuit that I tested today

I actually used two 3k3 resistors (edit: in parallel) instead of 1k5 in series with rts, but 1k5 should be fine.
I removed the optocoupler that indicates that the HU is on (the software doesn't need it anymore) and the transistor facing HU RX (which is now directly connected to the optocoupler output, the inversion is made by reversing the led polarity).

pippolippi · 03-20-2006, 01:28 PM

Quote: Originally Posted by pippolippi

I don't know either, probably the startup sequence is different since I don't try to completely emulate the cdc.

I send:

Code:

  def startPacket(self):
     """Tries to send the initial packet"""
     time.sleep(0.5)
     self.flushInput()
     self._sendsequence=0
     self._recsequence=0
     if self.sendPacket('\x11\x60\x06'):
          self.sendPacket('\x25\x03')
          self.sendPacket('\x26\x05\x01\xFC\xFC')
          self.sendPacket('\x25\x03')
          if self.sendPacket('\x20\x01\x03\x09\x05\x01'):
              return True
     return False

I now found that if I omit the 260501FCFC (random off) packet the HU won't send "random on" on startup. So it seems that if the HU sees that the CDC is in an "incorrect" state it will try to correct it. It's good to know since this way it's not necessary for the PC program to store random state: always say that's off and the HU will correct that.
I also found that the minimal startup sequence is
116006
200103090501

The last packet (200103090501) indicates to the HU which cd is playing, and I'm not sure it is needed.
Anyway I factored it out in a separate function

Code:

  def playingCD(self,number):
    """Sends the cd number currently playing"""
    return self.sendPacket('\x20\x01\x03\x09\x05%s' % chr(number))

and I found that the HU is capable of displaying CD numbers up to 9 (i.e. it's not limited to 6), a bigger value will show a blank. Didn't try with 0, I'll try later on.

pippolippi · 03-20-2006, 03:55 PM

Quote: Originally Posted by pippolippi

indicates that the HU is on (the software doesn't need it anymore) and the transistor facing HU RX (which is now directly connected to the optocoupler output, the inversion is made by reversing the led polarity).

I'm thinking that the protection diode after RTS is maybe useless: the optocoupler output transistor is still seeing all the reverse voltage in case DTR is high and RTS is low.
Instead of connecting this way

Code:

        _____
5  ----[_____]---|<--- RTS


4  ------------------- DTR

maybe I should connect it to shunt the reverse voltage:

Code:

        _____
5  -+--[_____]-------- RTS
    |
    -
    ^
    |
4  -+----------------- DTR

what do you think?

peppuz79 · 03-21-2006, 06:50 AM

Quote: Originally Posted by pippolippi

[code]
_____
5 -+--[_____]-------- RTS
|
-
^
|
4 -+----------------- DTR

That's are the better solution i think, why some reverse voltage?

Anyway I'm emulate my CDC without any resistor or transitor, but only the ACTIVATION features work the other features doesn't work.

bye
peppe

pippolippi · 03-21-2006, 07:02 AM

Quote: Originally Posted by peppuz79

why some reverse voltage?

Because you cannot know the state of the RTS and DTR lines when connecting the interface (only after starting the program you can be sure).
In the worst case DTR could be +9V and RTS -9V, so the transistor will see an emitter-collector voltage of 18V, while its datasheet says the maximum is 7V.

pippolippi · 03-21-2006, 02:45 PM

This is the final circuit:

Vicne · 03-21-2006, 06:19 PM

Well sorry guys for not participating very much these days but I think I'm getting mad.
I finally decided to build the final hardware. I soldered the board, built the relay switching (CDC/PC) part, put connectors, isolated all with duct tapes, tie-wrapped the cables to the glovebox, etc, tested and ... it didn't work.
First the HU didn't want to switch to CDC (no idea why). I had to undo part of the work I just did to be able to test easily and then of course it began working again (no idea why either). Although, after a few seconds on CDC position, the HU turns off ! :-( (no idea why of course). It did it a few times, but after a few minutes, I could make a 10-minute session (still no idea).
I think either I have a serious cabling problem (loose connection or bad solder joint somewhere) or there's a grounding issue.
So, Pippolippi, I'm intending to build the circuit you just posted, and I have a few questions:
- Is it "validated" :-) with your HU ?
- I intend to use the RTS also to power my relays (via a transistor of course). So I guess I should come back to two separate 3.3K resistors, right ?
- If I'm using 2N2222 transistors and CNY74-2 opto-couplers, do you think I need to adapt some resistor values ?

Thanks very much, and any opinion is welcome of course.

Vicne

(*) btw Pippolippi, during the working session, I could notice the weird numbering after track 16. I think I found why, and it'll be fixed for the next version.

pippolippi · 03-21-2006, 06:49 PM

Quote: Originally Posted by Vicne

So, Pippolippi, I'm intending to build the circuit you just posted, and I have a few questions:
- Is it "validated" :-) with your HU ?

Yes

Quote:

- I intend to use the RTS also to power my relays (via a transistor of course). So I guess I should come back to two separate 3.3K resistors, right ?

Probably, one resistor to feed the optocoupler and another to feed the base of the transistor, yes. Or you can leave the 1k5 resistor and try, say, with a 10k to feed the transistor. Don't forget to put a diode (1n4002) across the relay to protect the transistor. But I'd try it on the breadboard before soldering.

Quote:

- If I'm using 2N2222 transistors and CNY74-2 opto-couplers, do you think I need to adapt some resistor values ?

I don't think so, but then I didn't really calculate the values

Vicne · 03-21-2006, 07:00 PM

Quote: Originally Posted by pippolippi

Probably, one resistor to feed the optocoupler and another to feed the base of the transistor, yes. Or you can leave the 1k5 resistor and try, say, with a 10k to feed the transistor. Don't forget to put a diode (1n4002) across the relay to protect the transistor. But I'd try it on the breadboard before soldering.

Sure. Thanks for your help. I'll try to plan and build that tomorrow night.