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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 634 (MULTIPLEX COMMUNICATION SYSTEM - DIAGNOSTICS)DTC 69: THEFT DETERRENT ECU COMMUNICATION STOPINSPECTION PROCEDURE
2004 Toyota Matrix XR, FWD, Standard

Inspection Procedure

2004 Toyota Matrix XR, FWD, StandardSECTION Inspection Procedure
WARNING: This page is about a different car, the 2004 Toyota Camry. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK CONTINUITY OF COMMUNICATION LINE 
    1. Check the wire harness between the instrument panel J/B (body ECU) and theft warning ECU (theft deterrent ECU).
      Fig 1: Checking Continuity Of Communication Line
      G02895333Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Disconnect the connectors of the B7 instrument panel J/B (body ECU) and T5 theft warning ECU (theft deterrent ECU).
      2. Check the continuity between terminal MPX3 (B7-13) of the instrument panel J/B (body ECU) wire harness side connector and terminal MPX1 (T5-10) of the theft warning ECU (theft deterrent ECU) wire harness side connector.

      Standard: Continuity 

    1. NG: REPAIR OR REPLACE WIRE HARNESS AND CONNECTOR 
    2. OK: Go to next step 
  2. CHECK THEFT WARNING ECU ASSY (THEFT DETERRENT ECU) (POWER SOURCE) 
    1. Inspect the ECU power source input.
      1. Disconnect the T5 ECU connector.
      2. Check the voltage between terminal +B1 (T5-2) of the ECU wire harness side connector and the body ground.
        Fig 2: Checking Theft Warning ECU Assy (Theft Deterrent ECU) (Power Source)
        G02895334Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Standard: 

    TERMINALS SPECIFICATION

    Symbols (Terminal No.) Wiring color Condition Specified condition
    +B1 (T5-2) <-->Body ground W-R <-->- Constant 10 -14 V
    1. NG: REPAIR OR REPLACE WIRE HARNESS AND CONNECTOR 
    2. OK: Go to next step 
  3. CHECK THEFT WARNING ECU ASSY (THEFT DETERRENT ECU) (GROUND) 
    1. Inspect the ECU body ground.
      1. Disconnect the T5 ECU connector.
      2. Check the continuity between terminal E (T5-11) of the ECU wire harness side connector and the body ground.

        Standard: Continuity 

        Fig 3: Checking Theft Warning ECU Assy (Theft Deterrent ECU) (Ground)
        G02895335Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPAIR OR REPLACE WIRE HARNESS AND CONNECTOR 
    2. OK: REPLACE THEFT WARNING ECU ASSY (THEFT DETERRENT ECU) 
RENDER: 1.0x

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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.