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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 848 (DRIVER SIDE JUNCTION BLOCK (BODY NO. 2 CONTROL SYSTEM) - DIAGNOSIS)CIRCUIT INSPECTIONDTC B1244 LIGHT SENSOR CIRCUIT MALFUNCTIONINSPECTION 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.

HINT:

In case of using the LEXUS hand-held tester, start the inspection from step 1 and in case of not using the LEXUS hand-held tester, start from step  2.

  1. Check light sensor. 

    PREPARATION: 

    1. Connect the LEXUS hand-held tester to the DLC3.
    2. Turn ignition switch ON and LEXUS hand-held tester main switch ON.

      CHECK: 

      The value of the illumination rate should change in the following range when the light sensor is put in the light or covered by a hand.

      OK: 

      0.8 ms - 22.0 ms 

    HINT:

    • This is the time to be taken for the light sensor to generate one circle of frequency according to the brightness.
    • When not using LEXUS hand-held tester (See INSPECTION ).
    1. NG : Replace the light sensor. 
    2. OK : Go to next step. 
  2. Check wire harness and connector between light sensor and driver side J/B ECU (See  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  ). 
    1. NG : Repair or replace wire harness. 
    2. OK : Replace driver side J/B ECU. 
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.