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Home › Lexus › 2004 › GS 300 › Repair and Diagnosis › External Pages › Different car › Section 344 (Driver Door Control System - Diagnostics) › Circuit Inspection › Power source circuit › Inspection Procedure

Inspection Procedure

WARNING: This page is about a different car, the 2005 Lexus GS 430 and 2005 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check ECU-B2, GAUGE and DOOR(FR) fuse. 

    CHECK: 

    Check continuity of ECU-B2, GAUGE and DOOR(FR) fuse.

    OK: 

    Continuity

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

    PREPARATION: 

    Turn ignition switch ON.

    CHECK: 

    Measure voltage between terminals SIG, and GND.

    OK: 

    Voltage: 10 - 14V 

    PREPARATION: 

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

    CHECK: 

    Measure voltage between terminals BDR, CPUB 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 next step. 
  3. Check wire harness and connector between ECU and body ground. 
    1. NG: Repair or replace wire harness or connector 
    2. OK: Check and repair wire harness and connector between ECU and battery. 
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