If the head unit doesn't have preamp level outputs, there may be no suitable signal in the head unit. The output ICs typically have high gain and therefore the signal they receive is typically very low. To drive a typical head unit's power amp IC to full power you only need ~1/2 volt. Although that's enough for some amps, it's marginal for others. You could build a preamp but unless you're using this as a learning tool, it's better to use a line converter.
If you can find the datasheet for the power amplifier IC, it will tell you which pins are the input for the chip.
Bear in mind that one small mistake could be very costly. There are few repair centers for OEM head units and they have no mercy on you if the deck is out of warranty (going into it will void the warranty). Don't try to do this unless you can afford to repair or replace the unit.
If you can find the datasheet for the power amplifier IC, it will tell you which pins are the input for the chip.
Bear in mind that one small mistake could be very costly. There are few repair centers for OEM head units and they have no mercy on you if the deck is out of warranty (going into it will void the warranty). Don't try to do this unless you can afford to repair or replace the unit.
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