ECU Data Monitor

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 OBD II scan tool or hand-held tester to the DLC3. See Fig 1.
Turn ignition switch to ON position.
According to the display on the tester, read the DATA LIST. See Fig 2.

Fig 1: Connecting Lexus Hand-Held Tester To DLC3

Fig 2: Identifying Key Unlock Warning System Data Monitor