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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 599 (LIGHTING SYSTEM - DIAGNOSIS)HEADLIGHT 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 2002 Lexus SC 430. However, it is still accessible from the selected car via links, so may be relevant.
  1. DO ACTIVE TEST OF OBD II SCAN TOOL OR LEXUS HAND-HELD TESTER 
    1. Connect the LEXUS hand-held tester to the DLC3.
    2. Check the headlight using ACTIVE LIST.

    Front Controller: 

    FRONT CONTROLLER INSPECTION

    Description Tester display Check condition
    Headlight Hi HEAD LIGHT (HI) ON - OFF

    Driver Side J/B ECU: 

    DRIVER SIDE J/B ECU INSPECTION

    Description (Symbols) Tester display Check condition
    Headlight HEAD LIGHT ON - OFF
    1. OK: PROCEED TO NEXT CIRCUIT INSPECTION) SHOWN ON PROBLEM SYMPTOM TABLE, SEE  PROBLEM SYMPTOMS TABLE  . 
    2. NG: GO TO NEXT STEP 
  2. INSPECT MULTIPLEX NETWORK FRONT LAMP ECU 
    1. Turn the ignition switch OFF.
    2. Disconnect the front light ECU connector.
    3. Measure voltage between terminal FHHI and GND.

      OK: 

      Voltage: 10 - 14 V 

    1. NG: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOM TABLE, see  PROBLEM SYMPTOMS TABLE  . 
    2. OK: GO TO NEXT STEP 
  3. CHECK HARNESS AND CONNECTOR 
    1. Check for open and short circuit in harness and connector between front light ECU and headlight.
    2. Check for open and short circuit in harness and connector between headlight and body ground.
    1. NG: REPAIR OR REPLACE HARNESS AND 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.