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Home >> Toyota >> 2004 >> MR2 C56 >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Body Control System - Diagnostics >> Circuit Inspection >> Power Source Circuit >> Inspection Procedure

Inspection Procedure

  1. Check voltage between terminal B of body ECU connector and body ground. 
    Fig 1: Checking Voltage At Body ECU
    G02914293Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    PREPARATION: 

    1. Remove the instrument panel (See REMOVAL ).
    2. Disconnect the B5 connector from the body ECU.

    CHECK: 

    Measure the voltage between terminal B of the body ECU connector and body ground.

    OK: 

    1. Voltage: 9 - 14 V 

    1. OK : Proceed to next circuit inspection shown on problem symptoms table (See  PROBLEM SYMPTOMS TABLE  )  .
    2. NG : Go to Next Step 
  2. Check DOOR fuse. 
    Fig 2: Identifying Door Fuse
    G02914294Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    PREPARATION: 

    Remove the DOOR fuse from the R/B No. 3.

    CHECK: 

    Check the continuity of the DOOR fuse.

    OK: 

    1. Continuity 

    1. NG : Check for short in all harness and components connected to DOOR fuse. 
    2. OK : Go to Next Step 
  3. Check harness and connector between body ECU and body ground (See  PROCEDURE  )  .
    1. NG : Repair or replace harness or connector. 
    2. OK : Check and repair harness or connector between body ECU and battery (See  PROCEDURE  )  .


  1. Check voltage between terminal IG of body ECU connector and body ground  .
    Fig 1: Checking Voltage At Body ECU Terminal IG
    G02914296Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    PREPARATION: 

    1. Remove the instrument panel ( REMOVAL ).
    2. Turn the ignition switch ON.

    CHECK: 

    Measure the voltage between terminal IG of the body ECU connector and body ground.

    OK: 

    1. Voltage: 9 - 14 V 

    1. OK : Proceed to next circuit inspection shown on problem symptoms table (See  PROBLEM SYMPTOMS TABLE  )  .
    2. NG : Go to Next Step 
  2. Check AM1 and GAUGE fuses. 
    Fig 2: Checking AMI & Gauge Fuses
    G02914297Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    PREPARATION: 

    Remove the AM1 and GAUGE fuses from the R/B No. 3.

    CHECK: 

    Check the continuity of the AM1 and GAUGE fuses.

    OK: 

    1. Continuity 

    1. NG : Check for short in all harness and components connected to faulty fuse. 
    2. OK : Go to Next Step 
  3. Check ignition relay (Marking: IG1) (See  INSPECTION  ). 
    1. NG : Replace ignition relay. 
    2. OK : Go to Next Step 
  4. Check ignition switch (See  INSPECTION  )  .
    1. NG : Replace ignition switch. 
    2. OK : Go to Next Step 
  5. Check harness and connector between body ECU and body ground (See  PROCEDURE  )  .
    1. NG : Repair or replace harness or connector. 
    2. OK : Check and repair harness and connector between body ECU and battery (See  PROCEDURE  )  .


  1. Check key unlock warning switch (See  INSPECTION  )  .
    1. NG : Replace key unlock warning switch. 
    2. OK : Go to Next Step 
  2. Check harness and connector between key unlock warning switch and body ECU (See  PROCEDURE  ). 
    1. NG : Repair or replace harness or connector. 
    2. OK : Proceed to next circuit inspection shown on problem symptoms table (See  PROBLEM SYMPTOMS TABLE  )  .


  1. Check power window control switch (See  INSPECTION  ). 
    1. NG : Replace power window control switch. 
    2. OK : Go to Next Step 
  2. Check harness and connector between power window control switch and body ECU (See  PROCEDURE  ). 
    1. NG : Repair or replace harness or connector. 
    2. OK : Proceed to next circuit inspection shown on problem symptoms table (See  PROBLEM SYMPTOMS TABLE  )  .


  1. Check door lock motor (See  INSPECTION  ). 
    1. NG : Replace door lock motor. 
    2. OK : Go to Next Step 
  2. Check harness and connector between door lock motor and body ECU  PROCEDURE  . 
    1. NG : Repair or replace harness or connector. 
    2. OK : Proceed to next circuit inspection shown on problem symptoms table (See  PROBLEM SYMPTOMS TABLE  ). 


  1. Check door unlock detection switch (See  CIRCUIT DESCRIPTION  )  .
    1. NG : Replace door unlock detection switch  .
    2. OK : Go to next step  .
  2. Check harness and connector between door unlock detection switch and body ECU (See  PROCEDURE  .
    1. NG : Repair or replace harness or connector. 
    2. OK : Proceed to next circuit inspection shown on problem symptoms table (See  PROBLEM SYMPTOMS TABLE  ). 


  1. Check door key lock and unlock switch (See  CIRCUIT DESCRIPTION  ). 
    1. NG : Replace door key lock and unlock switch. 
    2. NG: GO to Next Step 
  2. Check harness and connector between door key lock and unlock switch and body ECU  PROCEDURE  . 
    1. NG : Repair or replace harness or connector. 
    2. OK : Proceed to next circuit inspection shown on problem symptoms table (See  PROBLEM SYMPTOMS TABLE  ). 


  1. Check door lock control switch (See  INSPECTION  . 
    1. NG : Replace door lock control switch. 
    2. NG: Go to Next Step 
  2. Check harness and connector between door lock control switch and body ECU  PROCEDURE  . 
    1. NG : Repair or replace harness or connector. 
    2. OK : Proceed to next circuit inspection shown on problem symptoms table (See  PROBLEM SYMPTOMS TABLE  ). 


  1. Check courtesy switch (See  CIRCUIT DESCRIPTION  ). 
    1. NG : Replace courtesy switch. 
    2. OK : Go to Next Step 
  2. Check for a grounding malfunction caused by loosened screw  .
    1. NG : Install screw  .
    2. OK : Go to next step  .
  3. Check harness and connector between courtesy switch and body ECU, and courtesy switch and body ECU (See  PROCEDURE  . 
    1. NG : Repair or replace harness or connector. 
    2. OK : Proceed to next circuit inspection shown on problem symptoms table (See  PROBLEM SYMPTOMS TABLE  ). 
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