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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 856 (GATEWAY SYSTEM - DIAGNOSIS)CIRCUIT INSPECTIONDTC B1283: DRIVER SIDE JUNCTION BLOCK 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 2003 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check driver side J/B ECU. 

    CHECK: 

    Check whether or not meter illustration adjustment can be performed with the rheostat volume.

    1. NG : Replace driver side J/B ECU (See  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  ). 
    2. OK : Go to next step. 
  2. Check wire harness. 

    PREPARATION: 

    Pull out the ECU connectors mentioned below.

    DTC DETECTION ITEM

    Wire harness side connector of ECU Terminal
    Driver side J/B ECU - Front light ECU MPX1 (D3-15)-MPX2 (31)
    Driver side J/B ECU - Power tilt and power telescopic ECU MPX2 (D5-7) - MPX1 (P8-3)

    CHECK: 

    Check continuity of the wire harness between the connectors.

    Fig 1: Checking Continuity Of Wire Harness Between Connectors
    G03376590Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: 

    There is a continuity between the connectors. 

    HINT:

    If there is OPEN in any wire harness, please repair it.

    1. NG : Repair or replace wire harness. 
    2. OK : Replace driver side J/B ECU (See  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  ). 
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.