I just acquired a 2001 C320 and after giving a good clean and vacuum I folded down the rear seats, removed the rear headrests then after installation they would not pop down anymore when using the button on the dash. I checked to see if there were any vacuum lines loose but none were loose. They were working prior to me cleaning the car. What could this be? BTW, the door locks are operational.

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2001 E55

2001 E320 Sedan

2001 Subaru Legacy

2006 SLK280

2016 Subaru Outback 3.6