Rear Window Defogger System does not Operate [12/2017 - 10/2020]: Description

An operation request signal is sent to the air conditioning amplifier assembly via LIN communication when the air conditioning control assembly (window defogger switch) is operated.

When the air conditioning amplifier assembly receives the signal, it sends an operation request signal via CAN communication to the main body ECU (multiplex network body ECU).

When the main body ECU (multiplex network body ECU) receives the signal, it sends an operation request signal via CPXI communication to the No. 3 semiconductor power integration ECU.

After the operation request signal is received by the No. 3 semiconductor power integration ECU it outputs an operation signal and operates the window defogger.