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HOMESERVICE MANUALSTOYOTA2004CELICA GT, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 398 (POWER SEAT CONTROL SYSTEM - DIAGNOSIS)CIRCUIT INSPECTIONPOSITION SENSOR CIRCUITINSPECTION PROCEDURE
2004 Toyota Celica GT, Standard

Inspection Procedure

2004 Toyota Celica GT, 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 not using the LEXUS hand-held tester, start from STEP  2.

  1. Check position sensor signal. 

    PREPARATION: 

    Connect the LEXUS hand-held tester to the DLC3.

    CHECK: 

    1. Enter into the DATA LIST function of the LEXUS hand-held tester.
    2. When operating each adjustment function of seat by turning the power seat control switch of the vehicle, check that "Position sensor" value changes on the screen of LEXUS hand-held tester.
    3. When operating each adjustment function of seat by turning the power seat control switch of the vehicle, check that "Motor status" changes from OFF to ON on the screen of LEXUS hand-held tester.

      HINT:

      When the seat is moved to the limit positions, "Lock" is displayed in the column of "Motor status" on the screen of LEXUS hand-held tester. At that time, releasing the power seat control switch turns it OFF.

    1. NG : Check and replace power seat ECU (See  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  ). 
    2. OK : Go to next step. 
  2. Check position sensor. 
    1. NG : Replace power seat motor. 
    2. OK : Go to next step. 
  3. Check harness and connectors between driver seat ECU and position sensors (See  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  ). 
    1. NG : Repair or replace harness or connectors. 
    2. OK : Check and replace driver seat ECU (See  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  ). 
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.