Regarding the question you asked, according to the analysis of the abnormal sound parts you described, it is possible that the locking device of the rear seat and the fixed part of the car body is worn after being used for a long time, so that the back seat backrest can not be tightly fixed on the car body, and the car will shake slightly when driving, which will cause the back seat backrest to shake with it, thus causing the friction between the seat backrest fixing device and the lock on the car body to produce abnormal sound. You can try. When the vehicle is driving, someone sits in the back seat and leans back. If the abnormal sound disappears, it should be my analysis problem. You can eliminate the abnormal sound by adjusting the locking position or replacing the badly worn parts.
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