No Answer-Back: Description
WARNING: This page is about a different car, the 2011 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.
In some cases, wireless door lock control functions are normal but the hazard warning lights and/or wireless door lock buzzer answer-back function(s) do not operate. In such cases, the certification ECU (smart key ECU assembly) hazard warning light and/or wireless door lock buzzer signal outputs may be malfunctioning.
NOTE:
Troubleshooting should be started after confirming that the customize status of the answer-back function has been switched ON.