The subwoofer lites but no sound

that might be loose contact with ur speakers.. check it...

check the fuses on the and the fuse on the main power cord under the close to the battery if there good maybe try a different speaker
make sure the amp power lite is on

The TS500 is a stand-alone powered subwoofer. Other speakers are independent of it.

Th 'Lite' is a system but only the sub is self-powered. The rest are passive.

http://www.independentaudiovideo.com/store/item_view.asp?estore_itemid=1000328

Check fuses on unit

You may have a break in the wire. You can find out by slowing moving your fingers down the wire until you notice sound coming from the subwoofer. You can fix it yourself by cutting about an inch away from the break both ways. Then cuttings some of the wire off, so the copperwire is exposed. then wrap the two copperwire ends together and seal it with elections tape. or Try replacing the 60 watt subwoofer wire.

you need only 1 equalizer.

please go thru this manual carefully
http://www.bose.com/pdf/customer_service/owners/og_901.pdf

Sounds like the power supply in the subwoooooooofer box is dying.

Replace the whole thing . It's going to be the best way out.

replace the ribbon to the top screen. Look for "ds lite top screen" on ebay