Toyota Avalon 2008 Quick Reference Manual page 348

4-3. Do-it-yourself maintenance
How to initialize the tire pressure warning system
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STEP 1
Park the vehicle in safe place and turn the "ENGINE START
STOP" switch or the engine switch to OFF mode.
While the vehicle is moving, initialization is not performed.
STEP 2
Adjust the tire inflation pressure to the specified cold tire infla-
tion pressure level. (→P. 412)
Make sure to adjust the tire pressure to the specified cold tire
inflation pressure level. The tire pressure warning system will
operate based on this pressure level.
STEP 3
Turn the "ENGINE START STOP" switch or the engine switch
to ON mode.
STEP 4
STEP 5
Wait for a few minutes with the ON mode, and then turn the
"ENGINE START STOP" switch or the engine switch to OFF
mode.
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Push and hold the tire pressure
warning reset switch until the tire
pressure warning light blinks
slowly three times.