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HOMESERVICE MANUALSLEXUS2005ES 330REPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTANTI-THEFT SYSTEMSTHEFT DETERRENT SYSTEM - DIAGNOSTICSTHEFT DETERRENT HORN CIRCUITINSPECTION PROCEDURE
2005 Lexus ES 330

Inspection Procedure

2005 Lexus ES 330SECTION Inspection Procedure
  1. 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 the illustration and table.

    Standard: 

    TERMINAL SPECIFIED CONDITION

    Symbols (Terminal No.) Specified condition
    SH (T6-24) <=> Body ground 10 - 14 V

    NG: REPAIR OR REPLACE WIRE HARNESS AND CONNECTOR 

    Fig 1: Disconnecting Theft Warning ECU Assy Connector
    G02938855Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK 

  2. 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 2: Inspecting Security Horn Assy
    G02938856Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE SECURITY HORN ASSY 

    OK 

  3. 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 the illustration and table.

    Standard: 

    TERMINAL SPECIFIED CONDITION

    Symbols (Terminal No.) (Theft warning ECU <=> Horn) Specified condition
    SH- (T6-25) <=> (T1-1) Continuity
    Fig 3: Disconnecting Theft Warning ECU Assy & Security Horn Connectors
    G02938857Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.