i will try to dig up the pinout for the iBus for the nav unit, you might be able to jump the iBus pin from the nav unit onto some other location of the iBus, such as the CD changer ibus... the iBus throughout the car is technically same single wire, so you are not going to short it by jumping the ibus from the nav directly to other location... if the nav info is picked up, then you might want to consider making the jump rather permanent - stop looking for the break in the cables and make a permanent jump.. if the jump does not help, then you can continue the search... it is 2:30 in the morning here, so i will try to look up the the ibus pins on the nav tomorrow, unless somebody has it handy and will post in the meanwhile...
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