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HOMESERVICE MANUALSTOYOTA2004CELICA GT, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 244 (BACK DOOR CONTROL SYSTEMS)SYSTEM TESTSPOWER 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 step   2 . 
  2. Check Voltage Between Terminals POWER, 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 TABLE .
    2. NG  : Go to step  3.
  3. Check Wiring Harness And Connector Between ECU And Body Ground. 
    1. NG  : Repair or replace wiring harness or connector.
    2. OK  : Check and repair wiring 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.