Quote:
Where the heck are the wires for the wheel controls?

Aha! After a very helpful tip from a gentleman on the TUNFS forum (reg required), I've found the wires. For anyone else with a Nissan Frontier, they're yellow with red stripe and yellow with black stripe. If I read the multimeter correctly, I believe the resistance values I get are the following:
Code:
     Vol Up                  23 ohms              
     Vol Down                91 ohms
     Up                     602 ohms
     Mode                   337 ohms
     Down                   195 ohms
I forgot to check what the resistance of the open circuit is, but it's >2000 ohms, at any rate (I'd go back out and check, but I've already put my truck back together). So, I guess my next step is to figure out what I'm supposed to do with those values.