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HOMESERVICE MANUALSTOYOTA2004CELICA GT, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 314 (BODY CONTROL SYSTEMS - 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 Prius. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check ECU-B, DC/DC, GAUGE and DOOR fuse. 

    CHECK: 

    Check continuity of ECU-B, DC/DC, GAUGE and DOOR fuse.

    OK: 

    Continuity 

    1. NG: Replace the failure fuse. 
    2. OK 
  2. Check voltage between terminals B, BDR and E of body ECU connector. 

    PREPARATION: 

    1. Turn ignition switch OFF.
    2. Disconnect the Body ECU connector.

    CHECK: 

    Measure voltage between terminals B, BDR and E.

    OK: 

    Voltage: 10 - 14V 

    1. OK: Proceed to next circuit inspection shown on problem symptoms table  . See PROBLEM SYMPTOMS TABLE .
    2. NG: Go to next step. 
  3. Check wire harness and connector between body ECU and body ground  . See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE .
    1. NG: Repair or replace wire harness or connector. 
    2. OK: Go to next step. 

    Check and repair wire harness and connector between Body ECU and battery. 

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.