Optical Sensor: Operation
WARNING: This page is about a different car, the 2004 Chrysler Pacifica. However, it is still accessible from the selected car via links, so may be relevant.
The optical sensor provides a speed/time signal to the power liftgate control module. The speed signal is generated from a trigger wheel, located inside the clutch housing of the drive unit assembly. When the optical sensor is installed in the clutch housing properly, the trigger wheel is positioned in the optical sensor. Hard-wired inputs to and from the liftgate control module are used to monitor the speed/time of the liftgate motor and clutch assembly.