Toyota Avalon Owner's Manual page 166

'06 AVALON_U (L/O 0508)
3. Trip meter reset knob—Resets the two
trip meters to zero, and also change
the meter display.
To change the meter display, quickly
push and release the button. The meter
display changes in the order from the
odometer to trip meter A to trip meter
B, then back to the odometer each
time you push.
To reset the trip meter A to zero, dis-
play the meter A reading, then push
and hold the button until the meter is
set to zero. The same process can be
applied for resetting the trip meter B.
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