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What year is your voyager?
is the alarm factory or added after?
first be sure all the alarm inputs are closed,close all doors(lower drivers window),close liftgate,close hood,be sure that both key cylinders are in the neutral position and that the liftgate key cylinder is also in the neutral position, now lock the car with remote or key wait 30 seconds and reach in drivers side with out unlocking and open door with interior handle and let me know what happens, horn, lights, alarm light on or off etc, so I can tell you what diagnostics to do