I'm sorry I can't say for 100% sure but , if you check the coach fuse panel for a dedicated fuse marked smoke or CO detector, pull that fuse and check the red wire for power.
With a location as close to the shower as that one, a PO , may have grown tired of setting the detector off; while showering; and gone to the battery unit in a different location.
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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