Inspection Procedure

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.

CHECK CONTINUITY OF COMMUNICATION LINE
1. Check the wire harness among the power window regulator switch assy (passenger door ECU), driver side J/B (body ECU) and power window regulator master switch assy (driver door ECU).
  
  Fig 1: Identifying Power Window Regulator Master Switch Assy (Driver And Passenger Door ECU) And Driver Side J/B (Body ECU)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  1. Disconnect the connectors of the power window regulator switch assy (passenger door ECU), driver side J/B (body ECU) and power window regulator master switch assy (driver door ECU).
  2. Check the continuity between terminal MPX1 (F13-7) of the power window regulator switch assy (passenger door ECU) wire harness side connector and terminal MPX2 (B5-12) of the driver side J/B (body ECU) wire harness side connector.
    Standard: Continuity
  3. Check the continuity between terminal MPX2 (F13-8) of the power window regulator switch assy (passenger door ECU) wire harness side connector and terminal MPX2 (D17-8) of the power window regulator master switch assy (driver door ECU) wire harness side connector.
    Standard: Continuity
  NG: REPAIR OR REPLACE WIRE HARNESS AND CONNECTOR
  
  OK: Go to next step.
CHECK POWER WINDOW REGULATOR SWITCH ASSY (PASSENGER DOOR ECU) (POWER SOURCE)
1. Inspect the ECU power source input.
  1. Disconnect the F13 ECU connector.
  2. Check the voltage between each terminal of the ECU wire harness side connector and the body ground.
  Fig 2: Identifying F13 ECU Connector Terminals
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Standard:
  
  Fig 3: F13 ECU Connector Terminals Voltage Specification Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPAIR OR REPLACE FUSE OR WIRE HARNESS AND CONNECTOR

OK: Go to next step.
CHECK POWER WINDOW REGULATOR SWITCH ASSY (PASSENGER DOOR ECU) (GROUND)
1. Inspect the ECU.
  1. Disconnect the F13 ECU connector.
  2. Check the continuity between terminal GND (F13-2) of the ECU wire harness side connector and the body ground.
    Standard: Continuity
  NG: REPAIR OR REPLACE WIRE HARNESS AND CONNECTOR
  
  OK: REPLACE POWER WINDOW REGULATOR SWITCH ASSY