"ctsy" is short for "courtesy"...therefore the circuit the fuse is on is for the courtesy features in the car.
Check the owners manual if it's there to find the location of the fuse box. On most GM cars, it's somewhere under the dash by the driver's side, or possibly near or in the glovebox...
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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car
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