Toyota 2000 Tundra Owner's Manual page 26

Armrest
Type A
24
Type B
Type C
TUNDRA (34413U)
To use the armrest, do this.
Type A—
To lower: Pull the lock release strap and
down the armrest.
To raise: Push down the lock release knob
and up the armrest.
Type B—Pull the armrest down as shown
in the illustration.
Type C—Pull the armrest out as shown in
the illustration.
NOTICE
To prevent damage to the armrest,
avoid putting heavy loads on it.