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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 599 (LIGHTING SYSTEM - DIAGNOSIS)TAILLIGHT 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 taillight using ACTIVE TEST.

    Luggage Room J/B ECU: 

    LUGGAGE ROOM J/B ECU INSPECTION

    Description Tester display Check condition
    Taillight TAIL 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. CHECK HARNESS AND CONNECTOR 
    1. Check for open and short circuit in harness and connector between luggage room J/B ECU and rear combination light.
    2. Check for open and short circuit in harness and connector between rear combination light 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.