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HOMESERVICE MANUALSTOYOTA2004CELICA GT, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 265 (DRIVER DOOR CONTROL SYSTEM - DIAGNOSTICS)CIRCUIT INSPECTIONPOWER SOURCE 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 2002 Toyota Sequoia. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check ECU-IG, PWR No. 1 and ECU-B fuse. 

    CHECK  : Continuity of ECU-IG, PWR No. 1 and ECU-B fuse.

    OK  : Continuity.

    1. NG  : Replace the failure fuse.
    2. OK  : Go to  2
  2. Check voltage between terminals BDR, CPUB, SIG and GND of driver door ECU connector. 

    Preparation  : Turn ignition switch ON.

    CHECK  : Measure voltage between terminals SIG, and GND.

    OK  : Voltage: 10 - 14 V.

    Preparation:

    1. Turn ignition switch OFF.
    2. Disconnect the driver door ECU connector.

    CHECK  : Measure voltage between terminals BDR, CPUB and GND.

    OK  : Voltage: 10 - 14 V.

    1. OK  : Proceed to next circuit inspection shown on problem symptoms table. See PROBLEM SYMPTOMS TABLES .
    2. NG  Go to  3.
  3. Check wire harness and connector between ECU and body ground. 
    1. NG  : Repair or replace wire harness or connector.
    2. OK  : Check and repair wire harness and connector between ECU and battery.
RENDER: 1.0x

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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.