Cadillac XT4 2023 Owner's Manual page 326

manufacturers recommend
replacing tires more than six
years old.
Overloading is another leading
cause of trailer tire blow-outs.
Never load your trailer with
more weight than the tires are
designed to support. The load
rating is located on the trailer
tire sidewall.
Always know the maximum
speed rating for the trailer
tires before driving. This may
be significantly lower than the
vehicle tire speed rating. The
speed rating may be on the
trailer tire sidewall. If the
speed rating is not shown, the
default trailer tire speed rating
is 105 km/h (65 mph).
Conversions and
Add-Ons
Add-On Electrical
Equipment
Warning
The Data Link Connector
(DLC) is used for vehicle
service and Emission
Inspection/Maintenance
testing. See Malfunction
Indicator Lamp (Check
Engine Light) 0 126. A device
connected to the DLC
such as an aftermarket fleet
or driver-behavior tracking
device may interfere with
vehicle systems. This could
affect vehicle operation and
cause a crash. Such devices
may also access information
stored in the vehicle s
systems.
Driving and Operating
Caution
Some electrical equipment
can damage the vehicle or
cause components to not
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 76
and Adding Equipment to the
Airbag-Equipped Vehicle 0 77.
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