System Outline
The multiplex communication system is controlled by the body ECU, theft deterrent ECU, wiper relay, sub body ECU, tilt and telescopic ECU, remote control mirror ECU, power window master SW, power window control SW front RH, rear LH, RH, power seat ECU and SW, etc.
For example, when door is opened, a signal from the door courtesy SW is transmitted to body the ECU and turns on the indoor lamp.