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I'm trying to integrate aux input to the stock amp on my sister's 1993 Volvo 240 wagon. The amp takes a 6 pin "DIN" input plug from the radio. Some Volvo forums unclearly report that the pins represent the positive wire of four speakers, a shared negative wire for the speakers, and remote amp turn on.
Sounds reasonable and jives with the adapter I found on a Swedish online shop, netonnet.se. See attachment - D6pin IN to 4 RCA+ remote.
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Any idea how I can determine which wires are which, or if this estimate is even correct? I tried a voltmeter to the radio's 6 pin output, assuming that adjusting the fade/balance to play through one speaker at a time would show signal only on that line. Unfortunately not so.
What setting on the meter? What was your signal? (Best bet would be a 0dB 50-60 Hz (power line frequency) test signal.
You should see a change in signal amplitude (voltage) by changing fader/balance...
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I grounded the voltmeter to the power/control harness ground and put the positive into each of the six pins, only getting signal on the center pin (supposedly the shared ground). Putting the voltmeter ground in the center pin and the positive on the others showed nothing.
Was it +12V? Then it's likely the remote... Might be that the shield (outer ring of the contact) is used for signal ground - did you try that?
Pure gut feeling - and a hope fore some sort of logic in the wiring - suggests the audio signals on the pins on the left and right of the symmetry-axis and remote on either of the 2 pins on the axis (center and the one below) and ground on either the remaining pin or the chassis (outer ring)
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Or could I used my hacked 1/8"-stereo-to-speaker-wire adapter to send input to the amp? Could I hurt anything by sending audio down the ground, amp sense line, or other weirdness?
Unlikely to hurt the amp, but possibly the signal source (connecting an output that expects a high impedance to a possibly low impedance input might blow the output due to excessive current.
I'd use a signal source that, worst case, I wouldn't mind tossing. Maybe an old Walkman...
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No, I'm not integrating an empeg alongside the stock radio, sadly. I'm going to put a source switcher in for iPod aux in. I think it'll be a cool stealth install for my sister who doesn't care about audio quality; only wants to keep her brick totally stock.
<Depending on how rushed you are I could try to take a look in some local shops, the 240 isn't exactly uncommon here 
(but I'm still not allowed to drive so it's a bit of a project getting around 
).
But I'll see if I can find something more detailed online though.
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/Michael
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