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HOMESERVICE MANUALSTOYOTA2004CELICA GT, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 263 (BACK DOOR 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 Sequoia. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check POWER, ECU-B and ECU-IG fuse  .

    CHECK  : continuity of POWER, ECU-B and ECU-IG fuse.

    OK  : Continuity

    1. NG  : Replace the failure fuse.
    2. OK  : Go to next step.
  2. Check voltage between terminals POWE, SIG, BDR, BECU and GND of back 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 back door ECU connector.

    CHECK  : measure voltage between terminals BDR, BECU and GND.

    OK  : Voltage: 10-14V

    1. OK  : Proceed to next circuit inspection shown on problem symptoms table. See PROBLEM SYMPTOMS .
    2. NG  : Go to next step.
  3. Check wire harness and connector between ECU and body ground  . See HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS .
    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

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.