If you've got $15 you can figure it out.
Just buy an aftermarket head unit wiring harness.
Pop ou tthe radio and pop on the hanress. Then just isolate the factory wires that line up with the Grey and White Pairs of the wire harness. Those 4 wires are the + and - left/right channels. Tap all 4, tape them up and run them to the amp. Then solder RCAs to the end of those wires and go into the amp.
Bingo, you've got bass
Just buy an aftermarket head unit wiring harness.
Pop ou tthe radio and pop on the hanress. Then just isolate the factory wires that line up with the Grey and White Pairs of the wire harness. Those 4 wires are the + and - left/right channels. Tap all 4, tape them up and run them to the amp. Then solder RCAs to the end of those wires and go into the amp.
Bingo, you've got bass