Cadillac XT4 Owner's Manual page 242

Caution
Some electrical equipment can
damage the vehicle or cause
components not to work and would
not be covered by the vehicle
warranty. Always check with your
dealer before adding electrical
equipment.
Add-on equipment can drain the
vehicle's 12-volt battery, even if the
vehicle is not operating.
The vehicle has an airbag system.
Before attempting to add anything
electrical to the vehicle, see Servicing
the Airbag-Equipped Vehicle 0 68 and
Adding Equipment to the
Airbag-Equipped Vehicle 0 69.
DRIVING AND OPERATING 241