Thanks for your effort. From what I know, this pin out doesn't sound right (pun intended) though
. My reasons are as follows:
1)Having hand wired a couple of car radio harnesses, this looks like a typical stereo head unit pinout - with the antenna, battery, and aux power pins being give aways.
2)A typical car CD changer doesn't have enough power to drive any speakers. It probably outputs at line level.
3) Reading about the M-bus interfaces (such as a Blitzsafe), these are protocol converters not just audio signal processors. The word "bus" in the name suggests some kind of hand-shake going on between the two devices along with other control signal information. None of the pin names show any indication of bus signals.
Now you will say how I was going to overcome that? What I am hoping to find is one the 14 pin side of the head unit & not on the M-bus side. Reading about how the head unit responds to the CD changer switch while choosing the changer or aux input, it appears that there may be a way to input an Aux channel (without the need for an elaborate software based handshake). There may be a pin which with a simple logic high (or low) tells the head unit that an aux input is present and available for selection.
If my hypothesis above is correct, I will be able to rig up some simple aux only input. I understand analog & simple ldigital logic circuitry. I have no intention (or skills) to decipher the M-bus or AI-net protocols.
Thanks for your inputs so far guys. I will keep looking until I buy an iPod or something. If nothing is found by then, I may have to invest in a Blitzsafe.
Originally posted by SteveLuman
A1 CH 1, front left dash speaker (+)
A2 CH 1, front left dash speaker (-)
A3 power antenna (+)
A4 GN-BN battery (+)
A5 not used
A7 CH 2, front right dash speaker (+)
A8 CH 2, front right dash speaker (-)
A9 not used
A10 0.75 rheostat (+)
A11 not used
A12 battery (+)
A13 accessory (key-ignition +12v)