Originally Posted by Schrade
You need a SWITCHABLE 3.5mm jack ($5), and 2-3 feet of wire.
The way the mod works that I saw posted (page bookmarked with snappics on another computer), is : (and I can't take credit; it's web-blogged (or Stickied) somewhere)
the optical disk / CD Player has a dedicated logic board IN THE HEAD UNIT, which connects by an internal harness to the main logic board, ALSO IN THE HEAD UNIT.
this internal harness carries L and R signals, a common, and a few others, one of which is a POWER interrupt, so that when you plug in a CD, it auto-plays.
The mod is thus:
cut the L and R signal wires on the internal harness. Splice onto the FROM CD PCB (printed circuit board) side L and R signal wires, and on the other end, ONTO the 3.5mm INPUT terminals.
Route 2 more leads from the 3.5mm OUTPUT, BACK to the L and R mainboard INPUTS, where you cut.
Put in a CD, and it plays as normal, THROUGH the 3.5mm plug.
BUT, plug a 3.5 jack iPod into the socket, and the L and R signal circuit FROM the CD is interrupted by the switch (switch activates by the plug), and the iPod - or x device, gets carried to the mainboard.
Where to mount the 3.5mm socket???
This is why I asked if you had a snappic of the BACK of the HEAD UNIT faceplate. If it has IT'S OWN logic board behind the faceplate, and many do, then you cannot drill and mount the 3.5mm socket in the face of the HEAD UNIT. It DOESN'T need THAT much space tho'.
Otherwise, the socket would probably get routed to the center console somewhere.
Only 'problem' is, is that a CD must be playing, in order for the MAINBOARD to look for a signal from the CD INPUT harness. BUT, the CD won't be heard, with the signal interrupted at the socket.
(the CD PCB-to-mainboard harness must also include a SWITCH, activated by CD insertion, jumpable, so that a CD DOESN'T necessarily have to be inserted. That part isn't solved yet)
Will try to get this phot-doc'ed soon here...
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