Circuit Description
WARNING: This page is about a different car, the 2004 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.
If the answer-back buzzer does not sound even though the wireless door lock functions are possible and each wireless door lock buzzer circuit is operating normally, the theft warning ECU's (theft deterrent ECU's) wireless door lock buzzer controller outputs may be abnormal.