Unfortunately toyodiy were forced to removed their diagrams several years ago because it was unauthorised use of copyrighted material.
You can access the Electronic Parts Catalog, repair manual, and wiring diagrams from Lexus but it will cost you around £3 per hour:
https://www.lexus-tech.eu
Alternatively you can see the parts catalog and basic diagrams at a few online sites (until they get taken down), one of the best being 7zap:
https://lexus.7zap.com/en/eu/