ELECTROCHROMIC Rear View Mirror
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2001 Lexus RX 300, 2001 Lexus LX 470, 2001 Lexus IS 300, 2001 Lexus GS 430, and 2001 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.
Remove rear view mirror. Using jumper wires, apply positive battery lead to terminal No. 1 and negative battery lead to terminal No. 4 at rear view mirror harness connector. See Fig 1. Connect positive lead of voltmeter to terminal No. 2 and negative lead to terminal No. 3. Press mirror switch. Observe voltmeter and shine an electric light on face of mirror. Battery voltage should be present and face should change from bright to dark. Replace rear view mirror as necessary.