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Home >> Toyota >> 2002 >> 4Runner Base >> Repair and Diagnosis >> Body & Frame >> Door Locks >> Back Door Control System >> Circuit Inspection >> Power Source Circuit >> Inspection Procedure
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Inspection Procedure

  1. Check POWER and JCB M-fuses, and MPX-B and ECU-IG fuses. 

    CHECK: 

    Check the continuity of the POWER and JCB M-fuses, and MPX-B and ECU-IG fuse.

    OK: 

    1. Continuity 
    1. NG: Replace failure fuse. 
    2. OK: Go to next step 
  2. Check voltage between terminals POWE/ECU-B/IG and GND of back door ECU connector. 

    PREPARATION: 

    Turn the ignition switch ON.

    CHECK: 

    Measure the voltage between terminals IG and GND.

    OK: 

    1. Voltage: 10-14 V 

    PREPARATION: 

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

    CHECK: 

    Measure the voltage between terminals POWE/ECU-B and GND.

    OK: 

    1. Voltage: 10 - 14 V 
    1. OK: Proceed to next circuit inspection shown on problem symptoms table. See  PROBLEM SYMPTOMS TABLES  . 
    2. NG: Go to next step 
  3. Check  HARNESS AND CONNECTOR BETWEEN BACK DOOR ECU AND BODY GROUND  . 
    1. NG: Repair or replace harness or connector. 
    2. OK: Check and repair harness and connector between back door ECU and battery. 
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