2003 Lexus GS 430 User Guide - Page 112

CAUTION D After inserting the tab, make sure the tab and buckle are locked and that the belt is not twisted. 16G055 D Do not insert coins, clips, etc. in the buckle as this may prevent you from properly latching the tab and buckle. D If the seat belt does not function normally, immediately contact your Lexus dealer. Do not use the seat until the seat belt is fixed. It cannot protect an adult occupant or your child from injury. To connect the extender to the seat belt, insert the tab into the seat belt buckle so that the "PRESS" signs on the buckle release buttons of the extender and the seat belt are both facing outward as shown. You will hear a click when the tab locks into the buckle. When releasing the seat belt, press on the buckle release button on the extender, not on the seat belt. This helps prevent damage to the vehicle interior and extender itself. When not in use, remove the extender and store in the vehicle for future use.