... the problem is getting it to put the audio out on the dock pins.
My startup-order dependency is that it always charges, it just won't put audio out on the dock pins unless I dock it before applying power to the charger.
If I do it the other way round, then the audio comes out through the iphone speaker.
This was, I think, reproducible with indoor apple chargers too, but of course only on my modified plug (with pin 11 grounded and the 68k resistor on the accessory pin).
Perhaps this may be helpful;
http://pinouts.ru/CellularPhones-A-N/iPhone_connector_pinout.shtmlThinking about your resistor to ground comments, perhaps there is an issue with
which ground(s) you have used.
I
think there are separate ground pins for power, USB and audio within the iPhone connector. I do not know, but I suspect, that some of these grounds are NOT inter-connected together within the phone itself. Or maybe they are, but it may still be important which ground pin gets used for what.
There may also be different ground points within your vehicle connections for power vs. audio. Sometimes these can have voltage differentials even though they are all 'ground'.
Perhaps what is happening is that the
unpowered power input wiring is affecting the sensing of the 'grounded' 68K resistor or other pins you are depending upon. A review of exactly which pins and signals are grounded,
and through what, may lead you to a discovery and resolution.
Also review what voltages and resistances are on the D+ and D- pins, as these signal what charger 'type' is connected.
I also found this project connector that might be useful;
http://www.podgizmo.com/p/118/ipod-iphone-ipad-podbreakout-mini
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