WARNING: This page is about a different car, the 2002 Lexus GS 430 and 2002 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.
For pre-check, refer to the flowchart. See Fig 1-Fig 5
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Fig 1: Identifying Wireless Function Pre-Check Flowchart (1 Of 5)