Sorry to resurrect an old thread but this is the best source of iPod LOD information that I could find so I thought that I'd come here looking for help. The solution that is posted in this thread (pin 11 to pin 15, pin 21 to pin 15 via 68K resistor) works great for my old iPod Touch 2G but it doesn't behave well with my iPod Touch 4G. With the 4G sometimes it will work fine. Other times it will initially feed audio to the line out pins but after 20 seconds it will switch to the onboard speakers. After another 20 seconds it may switch back to line out or it may continue to feed the onboard speakers. The switching back and forth is a bit unpredictable but the 20 second interval is consistent. Strange.
I've got the following connections:
pin 11 connected to pin 15. This should send audio through line out rather than the onboard speakers
pin 21 connected to pin 15 via 68K. This should eliminate the pop up error on the iPod about accessory compatibility.
pin 15 connected to pin 16. This is actually redundant since these are already connected in the iPod.
pin 2 to common line out audio on car stereo. This is a line out signal to the stereo.
pin 3 to right line out audio on car stereo. This is a line out signal to the stereo.
pin 4 to left line out audio on car stereo. This is a line out signal to the stereo.
pin 16 to USB GND (from a USB adapter). This is the ground for the 5VDC power supply.
pin 23 to USB 5 VDC (from a USB adapter). This is the positive 5VDC supply.
pin 25 to USB Data - (from a USB adapter). The voltage on the USB Data connections allows the iPod to accept USB charging.
pin 27 to USB Data + (from a USB adapter). The voltage on the USB Data connections allows the iPod to accept USB charging.
On another website I saw that connecting pin 11 to pin 1 and 2, and pin 21 to GND via 500k works for some iPod Touch versions. Does it matter which GND you connect 11 or 21 to? Do 11 and 21 both need to be connected for the newer iPods? Would the connections of the USB data signals conflict with the audio connections?
I can find plenty of examples of the iPod Touch 2G pinout but I can't find a pinout for an iPod Touch 4G. Can someone give me guidance on the correct connections for reliable line out audio from a newer iPod Touch? Thanks!