The DA-1 power door lock actuator can provide a power door lock to a door that has rod style manual door locks. The actuator responds to electrical signals from the alarm or keyless entry system and physically moves the vehicle’s door locking rod to a locked or unlocked position. One DA-1 actuator will be needed for each door you want to control. If the alarm or keyless entry system you are installing does not have built-in door lock relays, you must add a door lock relay pack.