Conversions And Add-Ons Add-On Electrical Equipment - Cadillac XT4 Owner's Manual

240 DRIVING AND OPERATING
Trailer Tyres
Special Trailer (ST) tyres differ from
vehicle tyres. Trailer tyres are
designed with stiff sidewalls to help
prevent sway and to support heavy
loads. These features can make it
difficult to determine if the trailer tyre
pressures are low only based on a
visual inspection.
Always check all trailer tyre pressures
before each trip when the tyres are
cool. Low trailer tyre pressure is a
leading cause of trailer tyre blowouts.
Trailer tyres deteriorate over time. The
trailer tyre sidewall will show the
week and year the tyre was
manufactured. Many trailer tyre
manufacturers recommend replacing
tyres more than six years old.
Overloading is another leading cause
of trailer tyre blowouts. Never load
your trailer with more weight than the
tyres are designed to support. The
load rating is located on the trailer
tyre sidewall.
Always know the maximum speed
rating for the trailer tyres before
driving. This may be significantly
lower than the vehicle tyre speed
rating. The speed rating may be on
the trailer tyre sidewall. If the speed
rating is not shown, the default trailer
tyre 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) 0 111.
A device connected to the DLC
such as an aftermarket fleet or
driver-behaviour 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.