Rear Vehicle Speed Sensor
WARNING: This page is about a different car, the 2013 Subaru Forester, 2012 Subaru Forester, 2011 Subaru Forester, and 2010 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.
This vehicle speed sensor (output shaft speed sensor) is a Hall element type sensor and is externally mounted on the extension case. It detects the rear drive shaft speed in terms of the peripheral speed of the transfer clutch drum and sends pulse signals (30 pulses per rotation) to the TCM.