Behind the dash
 

2001 Montero Sport ES An aftermarket stereo installer ran the rear USB behind the instrument cluster to my phone mount at the A pillar. Trying to replace that unit myself. Tied the new unit's cable to the old one thinking it could be just pulled through. Turns out it took an extension cable to reach that far. When pulled the extension cable pulled out of the cable from the unit. Now the extension cable end is somewhere in no mans land behind the instrument cluster. Any suggestions on how to get to it?