Mercedes-Benz 2006 E 320 CDI Operator's Manual page 281

Controls in detail
Useful features
Removing cup holder
1 Dual cup holder
2 Locking pins
Move both locking pins 2 in direction
of arrows.
Take cup holder 1 out upward.
280
Reinstalling cup holder
3 Locking pins
Insert cup holder.
Move both locking pins 3 in direction
of arrows.
Rear cup holder
Briefly press the front of the rear arm-
rest.
The cup holder extends automatically.