Toyota Tundra 2005 Owner's Manual page 173

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If the indicator or buzzer comes on...
(p)
Key reminder buzzer
Four- wheel drive system
(q)
warning buzzer
172
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'05 TUNDRA_U (L/O 0409)
Remove key.
Shift the transfer mode correctly.
Do this.
2005 TUNDRA from Sep. '04 Prod. (OM34432U)