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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 296 (Multiplex Communication System - Diagnostics) >> Circuit Inspection >> DTC B1243/43: GSW Terminal Circuit Malfunction >> Inspection Procedure

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.
NOTE: Before ECU replacement, see HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS to ensure all communication line/bus/wire issues have been eliminated as a cause of communication loss.
  1. Check for open and short in wire harness and connector between body ECU and AIRBAG sensor assembly. 
    1. NG  : Repair or replace wire harness and connector.
    2. OK  : Go to next step.
  2. Check the body ECU. 

    Check  : If DTC B1243/43 is output after replacing body ECU.

    OK  : B1243/43 is not output.

    1. NG  : Replace the AIRBAG sensor assembly.
    2. OK  : Replace the body ECU (Original body ECU is failure).
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