In a 2004 Buick Rendezvous, the fuse for the radio is located in the underhood fuse box. You can find this fuse box near the battery in the engine compartment. Look for the fuse labeled "RADIO" or "AUDIO" in the fuse diagram on the cover of the fuse box to identify the correct fuse. If you need to replace it, ensure the vehicle is turned off before doing so.
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2004 Buick Rainier - Radio Fuse is #41 in the Fuse Block, under the drivers side rear passenger seat . . .
Fuse #20
it uses a circuit breaker for the power seats space 11 I believe
The console fuse panel diagram for a Buick Rendezvous can be found in the service manual. The service manual is available at most auto parts.
2003 buick rendezvous fuse box diagrams
15 AMP
You may want to check the fuse
Fuse #29 in the center console fuse block its a 25 amp
In my '04 it's fuse 32 in the fuse box near the engine.
It is number 32 in the under the hood fuse box. It takes a number 15 fuse.