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June 2013
Electrical Systems Operation & Diagnosis Module (602)
The PRG drive unit consists of a motor, drive gear, driven gear, half stop solenoid, half stop
solenoid switch, pulse or rotation sensor, and an electric clutch. When the driven gear turns, a
threaded drive block pushes or pulls the connecting rod that opens or closes the PRG.
PRG Drive Unit PRG Driven Gear
A parking or half stop gear is made onto the lower end of the driven gear. This gear is used to
lock the PRG in place if the memory height has been programmed or if the PRG was opened
and stopped beyond half-way.
The half stop solenoid pushes or pulls a rod that locks the parking or half stop gear, preventing
the driven gear from turning and holding the PRG in place.
Half-Stop Gear Half-Stop Solenoid
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