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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 701 (ENGINE IMMOBILIZER SYSTEM - DIAGNOSTICS)DIAGNOSIS SYSTEM
2004 Toyota Matrix XR, FWD, Standard

Diagnosis System

2004 Toyota Matrix XR, FWD, StandardSECTION Diagnosis System
WARNING: This page is about a different car, the 2004 Toyota Camry Solara. However, it is still accessible from the selected car via links, so may be relevant.
  1. DESCRIPTION 
    1. The ECM controls the vehicle's immobilizer system functions. Immobilizer system data and the DTCs can be read through the vehicle's DLC3.

      In some cases, a malfunction may be occurring in the immobilizer system even though the security indicator lamp is not illuminated. When the system seems to be malfunctioning, use the hand-held tester to check for a malfunctions and perform repairs.

  2. CHECK DLC3 

    HINT:

    The vehicle uses ISO 9141-2 communication protocol. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 9141-2 format.

    Fig 1: Checking DLC3
    G03050065Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TERMINAL SPECIFIED CONDITION

    Symbols (Terminals No.) Terminal Description Condition Specified Condition
    SIL (7) - SG (5) Bus "+" line During transmission Pulse generation
    CG (4) - Body ground Chassis ground Always Below 1 Ω
    SG (5) - Body ground Signal ground Always Below 1 Ω
    BAT (16) - Body ground Battery positive Always 11 to 14 V

    If the result is not as specified, the DLC3 may have a malfunction. Repair or replace the harness and connector.

    HINT:

    Connect the cable of the hand-held tester to the DLC3, turn the ignition switch ON and attempt to use the hand-held tester. If the screen displays the message UNABLE TO CONNECT TO VEHICLE, there is a problem either with the vehicle or with the tester.

    • If communication is normal when the tester is connected to another vehicle, inspect the DLC3 of the original vehicle.
    • If communication is still impossible when the tester is connected to another vehicle, the problem may be in the tester itself. Consult the Service Department listed in the tester's instruction manual.
    Fig 2: Connecting Hand Held Tester To DLC3
    G03050066Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. INSPECT BATTERY VOLTAGE 

    Standard: 11 to 14 V 

    If the voltage is below 11 V, replace the battery before proceeding.

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.