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June 2013
Electrical Systems Operation & Diagnosis Module (602)
The motor direction is controlled by changing the polarity of the positive and ground supply through
the PRG control unit. A duty ratio of 40 to 70 % controls the opening of the PRG and 60 to 80%
duty closes the PRG. This is due to the assist and resistance provided from the gas shocks.
NOTE: The duty ratio near the end of opening or closing should be approximately
30%.
NOTE: Weak or failed gas shocks will increase the closing speed of the PRG and set a
DTC.
PRG Drive Unit Motor Power Duty Ratio PRG Drive Unit Motor
Normal amperage flow during opening is approximately 16 amps to begin movement with a
sustained 2 amps.
Amperage flow during incorrect mechanical conditions or any condition that would block the PRG
from opening can reach as high as 20 amps. This high amperage will continue to flow until the
PRG control unit stops the opening function and re-latches the PRG.
PRG Drive Unit Motor Amperage Normal Condition PRG Drive Unit Motor Amperage with Gate Blocked
NOTE: Continued amperage flow above normal will result in the PRG reversing
direction. If the amperage is above normal for 2 consecutive attempts all PRG
functions will be canceled.
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