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SAFETY 81
AUXILIARY DRIVING SYSTEMS
Tire Pressure Monitoring System (TPMS)
The Tire Pressure Monitoring System (TPMS)
will warn the driver of a low tire pressure based
on the vehicle recommended cold tire pressure.
The tire pressure will vary with temperature by
about 1 psi (7 kPa) for every 12°F (6.5°C). This
means that when the outside temperature
decreases, the tire pressure will decrease. Tire
pressure should always be set based on cold
inflation tire pressure. This is defined as the tire
pressure after the vehicle has not been driven
for at least three hours, or driven less than
1 mile (1.6 km) after a three hour period. The
cold tire inflation pressure must not exceed the
maximum inflation pressure molded into the
tire sidewall. Refer to “Tires – General Informa-
tion” in “Servicing And Maintenance” for infor-
mation on how to properly inflate the vehicle’s
tires. The tire pressure will also increase as the
vehicle is driven, this is normal and there should
be no adjustment for this increased pressure.
The TPMS will warn the driver of a low tire pres-
sure if the tire pressure falls below the low pres-
sure warning limit for any reason, including low
temperature effects, or natural pressure loss
through the tire.
The TPMS will continue to warn the driver of low
tire pressure as long as the condition exists,
and will not turn off until the tire pressure is at
or above the recommended cold tire pressure
on the placard. Once the low tire pressure
warning (TPMS Warning Light) illuminates, you
must increase the tire pressure to the recom-
mended cold tire pressure in order for the TPMS
Warning Light to turn off. The system will auto-
matically update and the TPMS Warning Light
will turn off once the system receives the
updated tire pressures. The vehicle may need to
be driven for up to 20 minutes above 15 mph
(24 km/h) in order for the TPMS to receive this
information.
For example, your vehicle may have a recom-
mended cold (parked for more than three
hours) tire pressure of 30 psi (207 kPa). If the
ambient temperature is 68°F (20°C) and the
measured tire pressure is 27 psi (186 kPa), a
temperature drop to 20°F (-7°C) will decrease
the tire pressure to approximately 23 psi (159
kPa). This tire pressure is sufficiently low
enough to turn on the TPMS Warning Light.
Driving the vehicle may cause the tire pressure
to rise to approximately 27 psi (186 kPa), but
the TPMS Warning Light will still be on. In this
situation, the TPMS Warning Light will turn off
only after the tires are inflated to the vehicle’s
recommended cold tire pressure value.
CAUTION!
The TPMS has been optimized for the original
equipment tires and wheels. TPMS pressures
and warnings have been established for the
tire size equipped on your vehicle. Undesir-
able system operation or sensor damage may
result when using replacement equipment
that is not of the same size, type, and/or
style. Aftermarket wheels can cause sensor
damage. Using aftermarket tire sealants may
cause the Tire Pressure Monitoring System
(TPMS) sensor to become inoperable. After
using an aftermarket tire sealant it is recom-
mended that you take your vehicle to an
authorized dealership to have your sensor
function checked.
After inspecting or adjusting the tire pres-
sure, always reinstall the valve stem cap. This
will prevent moisture and dirt from entering
the valve stem, which could damage the Tire
Pressure Monitoring Sensor.
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20_BG_OM_EN_US_t.book Page 81
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