Two things : 1 turn it on and listen for its location - 2 it will be located very close to the water tank. Check for the water fill or the tank drain then look inside in a cabinet. You may have to remove a panel
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2009 Seville VF32KS
2019 GMC Sierra 3500HD Crew Cab Denali.
6.6 Diesel standard box.
We have a Cruiser Patriot and found it under a kitchen drawer. Had to remove a couple of the drawers to get good access. Just to the left of the sink but not reachable from the doors under the sink.