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Originally Posted by whatheheck
Can you kindly send me a link showing which wires I need to tap to for the Nav audio line out?
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Easy: there is a twsted pair of wires on the nav blue plug. Normally blue/ brown and blue/red. On some cars yellow/brown & yellow/red
red stripe is signal
brown stripe is ground
Fit around a 1 to 10k-Ohm potentiometer
solder one end of pot to brown stripe wire
Cut red stripe wire, solder nav end to other side of pot
Solder radio module end to wiper of pot.