Terminals Of Ecu

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 THEFT WARNING ECU ASSY (THEFT DETERRENT ECU)

Fig 1: Identifying Theft Warning ECU Assy Connectors
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. Disconnect the theft warning ECU assy connector, and check the voltage and continuity of each terminal of the disconnected connector.
  Standard:
  
  Fig 2: Disconnected Connector Voltage And Continuity Specification Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If the result is not as specified, the wire harness side may malfunction.
2. Connect the theft warning ECU assy connector, and check the voltage of each terminal of the connector.
  Standard:
  
  Fig 3: Connected Connector Voltage And Continuity Specification Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If the result is not as specified, the theft warning ECU assy may malfunction.
CHECK DRIVER SIDE JUNCTION BLOCK ASSY (BODY ECU)

Fig 4: Identifying Driver Side Junction Block Assy ECU Connectors
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. Inspect the ECU-B fuse.
2. Disconnect the 2F driver side junction block connector, and check the voltage of the terminal of the disconnected connector.
  
  Fig 5: 2F Driver Side Junction Block Disconnected Connector Voltage Specification Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If the result is not as specified, the wire harness side may malfunction.
3. Connect the 2F driver side junction block connector.
4. Check the voltage of each terminal of the connectors.
  Standard:
  
  Fig 6: 2F Driver Side Junction Block Connected Connector Voltage Specification Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  HINT:
  
  If the value is not as specified the vehicle may be defective. In this case, check the harness, connector and fuse between the ECU and battery, then repair or replace it if necessary.