Lexus GS430 User Manual page 536

INTRODUCTION
Removing the engine compartment cover
Before checking and replacing the blade type fuses, etc.
in the engine compartment, remove the engine
compartment cover as follows:
G61004
512
CAUTION
Be sure to turn off the engine before removing the
engine compartment cover. Failure to do so may result
in burns from heated components or serious injury
through becoming caught in moving parts.
You must remove the front cover before removing the side
covers. The location of the plastic clips is the same for all
engine models.
1 Turn the plastic screw until it turns freely. Although it is
turned freely, it cannot be removed from the engine
compartment cover.
2 Push the core of the clips and remove the clips.
Remove the cover. Be careful not to lose the removed plastic
clips.