As has been discussed elsewhere, I have a 2008 C4 Picasso with Hands Free Kit and an RD4. That means it has calls-only Bluetooth.
There's a Phone button in the lower left block of the steering wheel that opens the Phonebook / Recent Calls menu, from which calls can be started by choosing an entry using the lower right block wheel and OK button. Calls can also be answered using that OK button, or rejected using some other. It's also posible to use the Phone button during an ongoing call to open a menu with options, such as ending the call. During a call, the RD4 will only play the call's audio, and when ending it will resume whatever it was playing before. I'm quite interested in keeping this working more or less as it is, and that's why I haven't pursued some aftermarket solution.
The RD4 has only the quadlock and antenna going into it. The quadlock has wires going into only the A and B blocks, C is unused (I think it's for a CD changer). B has only 3 wires going into it, a beige one into position 4 and two yellow ones into 10 and 11. According to the pin out diagram, those are Aux1 R, Aux1 L, and Aux1 ground. Those 3 wires come inside a black sheath, which in turns comes inside a larger black sheath, in which there are 13 other wires going into the A block.
Now, from this setup, it's not clear to me how the Hands Free Kit works. It must get canbus data from somewhere, because it responds to the steering wheel and the RD4 buttons, and it must also send data back to the car, because the screen shows the menus and call lists and cell connection state. But it can't be one of those 3 wires... I suppose? Those 3 should be only for the call incoming audio. I have no idea where a microphone should be plugged into the RD4/RD45.
The A block has:
Code: Select all
1 yellow 5 green 9 - 13 yellow
2 yellow 6 blue 10 green 14 -
3 yellow 7 green 11 - 15 brown
4 yellow 8 beige 12 brown 16 green/yellow
Interestingly, 14 isn't connected. All the diagrams I've found say it's 15 that is unused, but I think that may be an error.
What happens when I swap the RD4 with an RD45?
First off, my original MFD is too old as mentioned elsewhere, and pairing doesn't work (it works with the RD4, the process is slightly different). I did find a 2010 MFD, SW 9.5, which I think will work, but I don't know the mileage in it and I don't want to risk connecting it unless strictly needed. But I did manage to pair the RD45 to my phone by connecting it to another Citroen, so the pairing part of the problem got solved (I almost only pair the phone when I get a new phone, so I'm good with that).
When connecting the pre-paired RD45 to the C4 Picasso,
- Someone had probably configured the RD45 for parking sensors, because those work just like they did with the RD4.
- Aux1 appears in the sources, but I haven't found a way to use it. There is a 4-pin to USB cable plugged into the 4-pin connector in the back of the RD4, but I don't think it's doing anything.
- The Source button cycles between Radio, Aux1, and the phone.
- The RD45 plays music from the phone alright. The sound quality is not stellar, but there's no obvious faults either. The next and previous buttons work as intended, as does play/pause. The MFD shows blank when the music source is the phone, but I'd sort of expected that.
- The phone auto-connects to the RD45 when I turn the RD45 on, although it takes a few seconds and the RD45 will start with the Radio source. I have to press Source after the phone connects in order to get back to streaming.
- The phone also auto-connects to the Hands Free Kit, as it always did, and then the Phone button in the steering whell will work as usual. But when making calls (which are through the Hands Free Kit, not the RD45) the speakers will only play the call audio for some seconds, and then cut it off.
- If I disconnect the phone from the Hands Free Kit, pressing the Phone button will simply say 'No phone connected', although it keeps available for music streaming. If I start a call using the phone, it will not show the RD45 as an option (it does show the RD45 when it's connected to the Hands Free Kit).
So to sum it all up, I think I need to do the following:
1. Unplug the B connector with the 3 wires going into the quadlock
2. Get a microphone and plug it... where?
3. Program something on the car to recognise the phone's connection to the RD45 as something that can be used for calls, and possibly disable the Hands Free Kit
4. Program something on the car to recognise the USB cable?
I'm not sure that steps 3 and 4 can be done, as I know nothing of how Lexia works. I do intend to get one.
At any rate, I have little use for USB. Maybe I could disable Aux1 as well, since it doesn't seem to match any actual port.
Am I off the mark?
Thanks in advance for any suggestions.
