Input Signal Check (Using Hand-Held Tester)
WARNING: This page is about a different car, the 2003 Lexus ES 300 and 2002 Lexus ES 300. However, it is still accessible from the selected car via links, so may be relevant.
Connect the hand-held tester to DLC3. See Figure. Check the control switch (MAIN, CANCEL, SET/COAST and RES/ACC).