Fail-Safe; Precautions On Tire Pressure Warning System - Toyota 2006 PRIUS Manual

NEW FEATURES - TIRE PRESSURE WARNING SYSTEM
8. Diagnosis
The new diagnostic system features improved serviceability. For details on the diagnostic methods and
diagnostic items, refer to the 2006 PRIUS Repair Manual (Pub No. RM01R0U).

9. Fail-safe

In the event of the malfunction in the tire pressure warning valve and transmitter circuits or tire pressure
warning ECU and receiver, the tire pressure warning system is prohibited, and the tire pressure warning light
illuminates or blinks to inform the driver of the failure.

10. Precautions on Tire Pressure Warning System

" If the tire pressure warning light illuminates, reduce the vehicle speed as soon as possible.
" Avoid making sudden steering or braking maneuvers because low-pressure tires could negatively affect
handling and braking performance.
" Make sure to use only the supplied valve caps (made of aluminum) on the tire pressure warning valve and
transmitter. If a metal cap (made of brass) is used, the cap could become seized.
" Do not use a flat tire sealant as it could cause the tire pressure warning valve and transmitter to malfunction.
" To protect the tire pressure warning valve and transmitter from damage, make sure to follow the
instructions in the Repair Manual to dismount a tire from a wheel.
" Perform pre-driving inspection and regular inspection in the same manner as for ordinary vehicles.
" If the tire pressure warning light blinks when the power source mode is selected to IG-ON, the tire pressure
warning system is not working properly. The system will be disabled in the following conditions: (When
the condition becomes normal, the system will work properly.)
Tires not equipped with tire pressure warning valves and transmitters are used.
The ID code on the tire pressure warning ECU is not registered.
Electric devices or facilities using similar radio wave frequencies are nearby.
If a radio set at similar frequencies is in use in the vehicle.
If a window tint that affects the radio wave signals is installed.
There is a lot of snow or ice on the vehicle, in particular around the wheels or wheel housings.
Non-genuine Toyota wheels are used.
If a special set of tires is used.
Tire chains are used.
The battery of the tire pressure warning valve and transmitter is depleted.
The tire pressure is extremely high (500 kPa or more).
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NF