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You may need a CAN-bus module in order to control the door locks with the alarm. When I had my Viper alarm installed, it needed two CAN-bus modules. I can't remember for which features, but I think it was one for the immobilizer and door locks, and another one for remote start. I also looked at Compustar alarms, and I think it may not have needed one or only needed one, I can't remember.
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