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I hope sleepybobcat wont mind me answering the question.
Service manual come in two volumes. Buy Volume2 for mechanical, body electrical, and engine stuff. Volume1 covers most of the diagnostics with Lexus service computer.
Electrical wiring is covered in another manual.
Manuals can be purchased through Lexus parts at about $100 (may be less may be more) each. Check with Steve at Carson Toyota too.