CBSonic

Yea if you plug an aux cable into the factoy plug, you can use the meter on continuity. On the bable itself it should have 3 levels. The bottom teir is ground, the other 2 are left and right. Touch one probe the the bottom teir, then prob each of the 6 wires. When the meter beeps, splice in the appropriate wire(red,white, or ground) to the wire you probed. Simple as that.

Ok i see. It cant be speakers. The signal goes through the radio then gets amplified and then sent out to the speakers. Id have to pull the full schematic off Alldata to be sure. If you have a multimeter it would be easy to test which wires are which for the aux. just a few simple continuity tests.

Some of those may be for the usb as well. There should be 3 wires in an aux cord. Left, right and ground. Did you try pullying out the aux cable from the glove box and seeing what pins are there?