Toyota 2009 Tundra Owner's Manual page 522

Tire pressure warning system certification
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MODEL/FCC IDs:
Transmitter: GQ4-32T
Receiver: GQ4-37R
IC (Canada) IDs:
Transmitter: 1470A-13T
Receiver: 1470A-9R
For vehicles sold in U.S.A .
This device complies with Part 15 of the FCC Rules. Operation is subject
to the following two conditions: (1) this device may not cause harmful
interference, and (2) this device must accept any interference received,
including interference that may cause undesired operation.
WARNING:
Changes or modifications not expressly approved by the party responsi-
ble for compliance could void the user's authority to operate the equip-
ment.
For vehicles sold in Canada
Operation is subject to the following two conditions: (1) this device may
not cause interference, and (2) this device must accept any interference,
including interference that may cause undesired operation of the device.
CAUTION
When inspecting or replacing tires
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Observe the following precautions to prevent accidents. Failure to do so
may cause damage to parts of the drive train, as well as dangerous han-
dling characteristics, which may lead to fatal or injury accidents.
Do not mix tires of different makes, models, tread patterns or tread-
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wear.
Do not use tire sizes other than those recommended by Toyota.
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Do not mix radial, bias-belted, or bias-ply tires.
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Do not mix summer, all season and winter tires.
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4-3. Do-it-yourself maintenance
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