Circuit Description
The transponder ECU senses, by the unlock warning switch, that the key is in the key cylinder, and transmits it as a signal to the theft deterrent ECU multiply. When the door is locked with the ignition switch OFF and the key in the key cylinder, the theft deterrent ECU transmits the LOCK signal. Then the UNLOCK signal is sent to the multiplex network door ECU front LH and RH. After those operations, the multiplex network door ECU front LH and RH drive the door lock motor.
NOTE:
The electrical door lock system has a function with large-scale body multiplex communication. First of all, inspect the communication function and check that no malfunction exists in the troubleshooting.