Toyota 2006 Highlander Owner's Manual page 144

If the indicator or buzzer comes on...
(h)
or
(i)
(indicator and buzzer)
(j)
(k)
(l)
(m)
(n)
134
'06 HIGHLANDER_U (L/O 0508)
Take vehicle to Toyota dealer.
If brake system warning light is also on, stop immediately and contact Toyota dealer.
Close all side doors and back door.
Stop and check.
Take vehicle to Toyota dealer immediately.
Take vehicle to Toyota dealer.
Adjust tire inflation pressure and turn off warning light by pushing reset switch for a
few seconds. If warning light remains, contact Toyota dealer.
Add washer fluid.
Do this.