08
8-35
Tire Terminology and Definitions
Air Pressure
The amount of air inside the tire pressing
outward on the tire. Air pressure is
expressed in pounds per square inch
(psi) or kilopascal (kPa).
Accessory Weight
This means the combined weight of
optional accessories. Some examples
of optional accessories are automatic
transmission, power seats, and air
conditioning.
Aspect Ratio
The relationship of a tire’s height to its
width.
Belt
A rubber coated layer of cords that is
located between the plies and the tread.
Cords may be made from steel or other
reinforcing materials.
Bead
The tire bead contains steel wires
wrapped by steel cords that hold the tire
onto the rim.
Bias Ply Tire
A pneumatic tire in which the plies are
laid at alternate angles less than 90
degrees to the centerline of the tread.
Cold Tire Pressure
The amount of air pressure in a tire,
measured in pounds per square inch (psi)
or kilopascals (kPa) before a tire has built
up heat from driving.
Curb Weight
This means the weight of a motor vehicle
with standard and optional equipment
including the maximum capacity of fuel,
oil and coolant, but without passengers
and cargo.
DOT Markings
A code molded into the sidewall
of a tire signifying that the tire is in
compliance with the U.S. Department
of Transportation motor vehicle safety
standards. The DOT code includes the
Tire Identification Number (TIN), an
alphanumeric designator which can
also identify the tire manufacturer,
production plant, brand and date of
production.
GVWR
Gross Vehicle Weight Rating
GAWR FRT
Gross Axle Weight Rating for the Front
Axle.
GAWR RR
Gross Axle Weight Rating for the Rear
axle.
Intended Outboard Sidewall
The side of an asymmetrical tire,
that must always face outward when
mounted on a vehicle.
Kilopascal (kPa)
The metric unit for air pressure.
Light truck (LT) tire
A tire designated by its manufacturer as
primarily intended for use on lightweight
trucks or multipurpose passenger
vehicles.
Load ratings
The maximum load that a tire is rated to
carry for a given inflation pressure.
Load Index
An assigned number ranging from 1 to
279 that corresponds to the load carrying
capacity of a tire.
Maintenance
8-44
Instrument panel fuse panel
Fuse Name(A) Circuit Protected
POWER OUTLET 3 20AUSB Charger
INTERIOR LAMP 10AFront Vanity Lamp LH/RH, Room Lamp, Map Lamp
HEATED MIRROR 10ADriver/Passenger Power Outside Mirror, A/C Control Module
P/WINDOW LH 25APower Window Main Switch
FCA 10AForward Collision Avoidance Assist Unit
POWER OUTLET 2 20AFront Power Outlet
IBU 1 15AIBU
MULTIMEDIA 20AAudio, A/V & Navigation Head Unit
SAFETY P/ WINDOW 25A
Driver Safety Power Window Module
P/WINDOW RH 25APower Window Main Switch, Passenger Power Window Switch
TCU2 15ATransaxle Range Switch, Back-Up Lamp Switch
BRAKE SWITCH 10AIBU, Stop Lamp Switch
MEMORY 1 10AInstrument Cluster, A/C Control Module
START 7.5A[M/T] ECM, IBU, [IVT] Transmission Range Switch
