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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 515 (MULTIPLEX COMMUNICATION SYSTEM - DIAGNOSIS)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 Prius. However, it is still accessible from the selected car via links, so may be relevant.
  1. DESCRIPTION 

    The gateway ECU controls the function of the multiplex communication system on the vehicle. Data of the multiplex communication system and the Diagnostic Trouble Code (DTC) can be read in the Data Link Connector 3 (DLC3) of the vehicle.

  2. CHECK DLC3 

    The vehicle's ECU uses the ISO 15765-4 for communication protocol. The terminal arrangement of the DLC3 complies with ISO 15031-03 and matches the ISO 15765-4 format.

    Fig 1: Identifying DLC3 Connector Terminals
    G02919787Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    DLC3 CONNECTOR TERMINALS DESCRIPTION

    Symbol Terminal No. Name Reference terminal Result Condition
    SIL 7 Bus "+" line 5 - Signal ground Pulse generation During transmission
    CG 4 Chassis ground Body ground 1 Ω or less Always
    SG 5 Signal ground Body ground 1 Ω or less Always
    BAT 16 Battery positive Body ground 9 to 14 V Always

    HINT:

    Connect the cable of the hand-held tester (with CAN VIN) to the DLC3, turn the power switch ON (IG) and attempt to use the tester. If the screen displays UNABLE TO CONNECT TO VEHICLE, a problem exists in the vehicle side or the tester side. If communication is normal when the hand-held tester is connected to another vehicle, inspect the DLC3 on the original vehicle.

    If communication is still impossible when the tester is connected to another vehicle, the problem is probably in the tester itself. Consult the Service Department listed in the tester's instruction manual.

    Fig 2: Connecting Cable Of Hand-Held Tester (With CAN VIN) To DLC3
    G02919788Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. INSPECT BATTERY VOLTAGE 

    Standard: 11 to 14 V 

    If voltage is below 11 V, recharge 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.