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 THEFT WARNING ECU ASSY
1. Disconnect the theft warning ECU assy connector.
2. Check the voltage between the theft warning ECU assy connector and body ground, as shown in Fig 1 and Fig 2.
  
  Fig 1: Identifying Theft Warning ECU Assy Connectors
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Standard:
  
  Fig 2: Theft Warning ECU Assy Connector And Body Ground Continuity Specification Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPAIR OR REPLACE WIRE HARNESS AND CONNECTOR

OK: Go to next step.
INSPECT SECURITY HORN ASSY
1. Connect the positive (+) lead to terminal 1 of the theft deterrent horn connector and negative (-) lead to body ground.
  Standard: Security horn blows
  
  Fig 3: Identifying Terminal 1 Of Theft Deterrent Horn Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPLACE SECURITY HORN ASSY

OK: Go to next step.
CHECK WIRE HARNESS (THEFT WARNING ECU ASSY - SECURITY HORN ASSY)
1. Disconnect the theft warning ECU assy and security horn connectors.
2. Check the continuity between the theft warning ECU assy connector and theft deterrent horn connector, as shown in Fig 4 and Fig 5.
  
  Fig 4: Identifying Theft Warning ECU Assy Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Standard:
  
  Fig 5: Theft Warning ECU Assy Connector And Theft Deterrent Horn Connector Continuity Specification Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 6: Identifying Terminal 1 Of T1 Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPAIR OR REPLACE WIRE HARNESS AND CONNECTOR

OK: CHECK AND REPLACE THEFT WARNING ECU ASSY (See CIRCUIT INSPECTION )