Yes, two radio fuses: 20A Radio No.1 and 7.5A Radio No.2. No.2 is in the Driver's side kick panel fuse box and No.1 is in the engine bay fuse box.
20A Radio No.1 == 20A DOME.
The subwoofer was optional starting in '89 or '90.
I'm looking at the charts for '88 right now.