Toyota 2003 HIGHLANDER User Manual page 106

If the indicator or buzzer comes on...
(h) or
(i)
(j)
(k)
(l)
(m)
(n) Key reminder buzzer
106
'03 HIGHLANDER_U (L/O 0208)
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.
Add washer fluid.
Remove key.
2003 HIGHLANDER from Aug. '02 Prod. (OM48441U)
Do this.