Bluetooth upgrade kit + cd1 mode?

[bawachhe]

Edit: see post #3 (here) for end results on this one; everything else just chronicles my adventure with this mod.

I got a Scosche bt1200 bluetooth car kit recently (because it's a full on car kit, supposedly just plugs in with whatever stereo you got, and costs $25 in certain locations on the interwebs). I have an 07 sr5 with a very standard [single disk, am/fm, aux, and I think 6 speakers, or wiring for 6 speakers] stereo.

I certainly could just plug it in inline with the 4r's stereo, but I want to figure out the wiring and preferably splice together adapters from my bt kit to the cd1 interface on the back of the stereo, especially since this isn't already taken up. I'd also like to integrate the bt kit controls with the steering wheel buttons without losing original functionality (tall order, I know).

Questions, then:
A: anybody know of a place I can (for cheap as possible) buy/get a plug for that cd1 slot? I can deal with just wires on the other end (this'd be preferable, actually). I'm aware of the possibility of getting an Iphone/Ipod hookup kit and just cutting that plug off, but it seems wasteful (as I do not own any apple products).
A.1: I haven't found anything yet on wiring diagrams for this plug particularly, and eventually I'll need some kind of data related to that, so if anyone has useful links or knowledge, please do inform.
B: I'm trying to make sense of the wiring diagram (looking at an 03 EWD I found) to see how to splice wires into the steering buttons for seeking only (I don't care about controlling my phone's volume with the steering wheel buttons, and the mode button is even less useful; not to mention if I want to retain their original functionality, it'll just confuse the stereo a LOT if I do use them), and it looks like the seek and volume buttons are wired up in series (both on one wire) instead of independently..can someone definitively confirm or deny this? I really hope not..

reason for B: the kit I got doesn't seem to provide inputs coming off its stereo harness wires for buttons; that comes only off the remote, which is a separate plug entirely on the bt kit. I can figure out what wires I need for the remote's plug, I just need to know about the steering wheel wiring.

This'd be fun to turn into a DIY if I get it working. Any help is appreciated!

 

[bawachhe]

Good news, everyone!

I've been intent on getting this bluetooth kit working, and doing so in pretty much exclusively the auxiliary port ("CD1") of my 07 4runner, factory [non JBL?] head unit. As such, I've been researching extensively... And have found more infos!

(this is awesome to me because it's for minimal cost.
Cost so far:
$25 - BT1200 kit with the brain and from-brain harness for stereo interruption or otherwise inline wire-up, and remote, and mic
$14 - factory stereo aux plug [attached to otherwise useless harness adapter]
Total: ~$40.
)

Der me: the easiest way to find one of those plugs that connects to the back of a unit like mine for cheap is to buy a Y cable, searchable thusly:
google!
Der: I bought a cable for (fortunately only) $14, $2 more than most of those, that connected to some obscure unit that no longer exists. :shrug:

I asked scosche central/hq for some kind of wiring diagram or similar for the remote on their BT1200 kit (the one I got) to try and splice some steering wheel control goodness right into that plug from the HU (it works exclusively off that plug for ipods, so I thought surely there must be a way for this). Still waiting on a response from that... I'll probably call them later.

And the most elusive thing to find ever: the wiring diagram for all possible plugs coming out of the back of the HU. I was specifically looking for the 12-pin connector, referred to in Toyota's EWD for 4th gen 4runners as R4.
The search for this.. is OVER! (perhaps you don't understand: I've been scouring the internet and pdfs from it for about 2-3 weeks now, daily, for at least 3 hours each day)

The promised link: 2003 Toyota 4Runner Navigation Screen / Head Unit Connections, Connectors, & Pins

I might want to post this in a separate thread if someone cares (unless this is another der moment and somebody had this readily available somewhere). (Let me know if I shouldn't..)

So, theoretically, I have all the pieces needed to splice the BT1200 connectors to the factory stereo's aux plug.

I just have to ...probably make a mini brain that'll convert toyota steering wheel controls to whatever the BT1200 kit understands (probably very basic button presses..). That'll be the last cost, and it probably requires nothing more expensive than an arduino (about $25 for a total of $65 whole project); I hope it doesn't get that complicated, could just be some resistors/diodes on a waffle board or something, which'd cost less.

I don't know if anyone cares to know how to do this so specifically, since most of you would just front the money for a better HU with bluetooth in it, or not care about these features in this exact configuration as much as I do, but let me know if so and I'll start putting up pics and instructions and whatnot.

 

[bawachhe]

A sad theory that's probably true..

You know how you get to a point in projects that you've no guarantee will work where you realize there's no continuing, because it's just not doable?

Yeah..

So there's a 12 pin connector on the back of most people's HUs that works for the CD1 (second auxiliary) input for the stereo. (R11 for those with an Electrical Wiring Diagram.) I have a generic bluetooth upgrade kit, as mentioned above (the Scosche BT1200) which I was excited to splice into this connector (which was kind of elusive to find online, but I did). Last night, I tried this. After much fiddling and no CD1 mode coming alive, I find myself wondering whether the 2007 4runner HU (non-JBL; the super basic one) has a CD1 mode. Probably it does still, but it wasn't working.

My theory is this: the R11 pin diagram is also very elusive, but I found that on castlucci also a little while ago (2003 Toyota 4Runner Navigation Screen / Head Unit Connections, Connectors, & Pins), and on this diagram I noticed a TX+ and a TX- pin, indicating that it's for "Transmission", most likely of data between a multidisk CD player or the XM or whatever you connect to it, and the HU, as well as to enable control from the HU to the auxiliary device. I had a theory that this Transmission signal is what tells the HU that something's connected; however, the BT1200 has no such signal output, so I had no way of connecting it without making a small computer to handle the interface between BT1200 and HU.

Long story short, I gave up, donated the $25 kit to my roommate for his jankmobile (96 or 97 Corolla, alriiiiight!), and found meself another BT kit that actually works specifically with the R11 plug on my car, also for somewhere between $25 and $60 in the right places (I found it for $25 here: Bluefusion Bftak Hands Free Bluetooth Integration for Select Toyota Vehicles | eBay); so if you want BT functionality and still have a stock HU and don't want to replace the HU, get a Scosche BFTAK for less 'n' a hunderd. Plug-n-play and you're done. (Firsthand confirmation of that pending.)

Thanks for reading along if you did, and sorry for monologuing on a thread if you didn't.