Toyota 2001 Tundra Owner's Manual page 171

Type A (instrument panel)
164
'01 TUNDRA_U (L/O 0008)
To fold down the armrest
with the cup holder
To return the armrest with the cup
holder to the original position
Type B (front split bench seat—only when
the armrest is down)
2001 TUNDRA (OM34416U)
Type C (console)