Toyota 2003 Tundra Owner's Manual page 105

If the indicator or buzzer comes on...
(h) or
(i)
(j)
(k)
(l)
(m)
(n) Key reminder buzzer
Four–wheel drive system
(o)
warning buzzer
'03 TUNDRA_U (L/O 0301)
Take vehicle to Toyota dealer.
Close all doors.
Take vehicle to Toyota dealer immediately.
Shift front drive control lever out of "N".
Stop and check.
Add washer fluid.
Remove key.
Shift the transfer mode correctly.
2003 TUNDRA from Jan. '03 Prod. (OM34421U)
Do this.
105