Circuit Description
WARNING: This page is about a different car, the 2004 Lexus ES 330. However, it is still accessible from the selected car via links, so may be relevant.
When the ignition switch is ON, the power window regulator master switch (driver's door ECU) send to the power window regulator switch (passenger's door ECU) for multiply a remote switch signal, and then the power window regulator switch (passenger's door ECU) drives the power window motor for the passenger. And the power window regulator master switch (driver's door ECU) send driver side J/B (body ECU) to the rear window regulator switch LH and RH for multiply a remote switch signal, and then the power window regulator switch LH drives the power window motor LH and the power window regulator switch RH drives the power window motor RH.
NOTE:
Power window system use a large-scale body multiplex communications. First of all, confirm the communication function depending on the "how to proceed with troubleshooting", and check that there is no abnormality in the communication system. Then finally proceed with the troubleshooting. Also, if the power window system has a malfunction in the jam protection function, the power window AUTO UP/DOWN does not operate and a diagnostic code is recorded. Confirm the diagnostic code before troubleshooting.