DTC B1243/43: GSW Terminal Circuit To Center Air Bag Sensor Assembly Malfunction: DTC Detecting Condition
WARNING: This page is about a different car, the 2002 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.
DTC B1243/43 is set when an open or short circuit condition is detected on GSW circuit (Blue wire) between center air bag sensor assembly and body control ECU.