subwoofer not working in my 04 379

Recently purchased an 05 and a 04 379 and brought them home from the Pete dealer the other day. I noticed a slight difference in the sound system between the 05 and 04 and decided to take a deeper look.

Found the difference... the two sub speakers that hide underneath the bed in the 04 aren't working. So I tore into it today and found out why, no power... at either the subwoofer disconnect clip and subwoofer clip. So I tore into the HU and amp area and found all the speaker connectors and also I found the schematic from supermiller and have a question;

What connector would the subwoofer run to in the HU/amp area...

RSA or Rear Speaker Output

I checked the green and violet wires in the Rear Speaker output clip and they all have power.

I am not entirely sure what the RSA clip goes to. The schematic says Rear Seat Audio. ???

Anyone else have problems with this?

 

I've been out working the last month. Haven't made progress. I have plans to upgrade the entire system, so decided to leave it alone for now.

 

I have the factory amp that all speakers run into as well. When i tested for power... not getting power at the sub connector, but am off the connector from the amp. So it appears there is a break in the cable between amp and sub. didnt have the time to pull off panels and locate.