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Remove knee bag connector,jumper pins together on harness side, reconnect battery and see if code is still present.
Wait this code is for Drivers seat position sensor not the knee bag?
Code B1653 is for the seat position sensor. See attached diagnostic steps, this is for a Rav4 but is very similar to your Avensis, I do not have access to Avensis manuals here. Connector and sensor is located under the drivers seat
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