For the fuse there is a door window fuse in the fuse box.
Scion door lock issues.
It is just a wear and tear item.
If you have multiple doors or all the doors failing to lock unlock you either have a simple blown fuse or a much larger wiring issue.
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It is a simple swap to replace the fuse.
All doors multiple doors fail to lock unlock.
However if your windows work it may not be the fuse.
It is time to bring it in for repair.
Apdty 136028 front left driver side door lock actuator fits 2004 2006 scion xb 2000 2005 toyota echo replaces 6912052030 69120 52030 4 5 out of 5 stars 6 14 90.
The door actuator going bad is a pretty common maintenance item with cars.