Toyota 2006 Highlander Owner's Manual page 96

The "AIRBAG ON" and "AIRBAG OFF"
indicator lights will be illuminated ini-
tially when the ignition key is turned to
the "ON" position. After about 4 sec-
onds, they will go off. After that, the
front passenger occupant classification
system operates and judges which indi-
cator light be illuminated.
86
'06 HIGHLANDER_U (L/O 0508)
The SRS warning light and "AIRBAG
OFF" indicator light will come on if
there is a malfunction in the front pas-
senger occupant classification system.