How do you use self destruct on Lego Star Wars the complete saga?

You can't use "self destruct" in Lego Star Wars: The Complete Saga. The game doesn't have that feature for any character or vehicle.

The closest you can get to a "self destruct" is:

* Using explosives: Some characters and vehicles have access to explosives like grenades or rockets. You can use these to destroy yourself and nearby enemies, but it's not a specific self-destruct function.

* Destroying your own vehicle: You can choose to destroy your own vehicle by driving into obstacles or using explosives on it. This would essentially "self destruct" the vehicle.

However, the game doesn't have a built-in "self destruct" feature like some other games. It's focused on a more lighthearted and family-friendly experience.