Circuit Description
When the defogger switch is turned on, a rear defogger activation request signal is input to the A/C control (A/C ECU) from the multi-display1 or center cluster integration panel2 . Then, the A/C control assembly outputs this signal to the defogger relay (Marking: DEFOG) and the rear window defogger system is activated.
HINT:
- w/ LEXUS navigation system
- w/o LEXUS navigation system
NOTE:
The rear window defogger system is part of the large-scale body multiplex communication system. The first step in any repair is to confirm the proper operation of the communication system. Proceed with troubleshooting after the communication has been verified.