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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 849 (PASSENGER SIDE JUNCTION BLOCK (BODY NO. 3 ) CONTROL SYSTEM - DIAGNOSIS)CIRCUIT INSPECTIONPOWER SOURCE CIRCUITINSPECTION 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 MPX-IG, MPX-B1, WIP and P B/ANC fuse. 

    CHECK: 

    Check continuity of MPX-IG, MPX-B1, WIP and P B/ANC fuse.

    OK: 

    Continuity 

    1. NG : Replace the failure fuse. 
    2. OK : Go to next step. 
  2. Check voltage between terminal MPX-B, MPX-IG, WIP, P B/ANC, ACC and GND of passenger side junction block. 

    PREPARATION: 

    Turn the ignition switch ON.

    CHECK: 

    Measure voltage between terminals MPX-IG, ACC and GND and body ground of the passenger side J/B.

    PREPARATION: 

    1. Turn the ignition switch OFF.
    2. Disconnect the passenger side junction block.

    CHECK: 

    Measure voltage between terminals MPX-B, WIP, P B/ANC and GND and body ground of the passenger side J/B.

    OK: 

    Voltage: 10 - 14 V 

    1. OK : Proceed to next circuit inspection shown on problem symptom table (See  PROBLEM SYMPTOMS TABLE  ). 
    2. NG : Go to next step. 
  3. Check wire harness and connector between passenger side J/B ECU and body ground (See  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  ). 
    1. NG : Repair or replace wire harness or connector. 
    2. OK : Proceed to next circuit inspection shown on problem symptom table (See  PROBLEM SYMPTOMS TABLE  ). 
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.