The Sigma is an Alarm System and is an aftermarket fit. Try a search for Sigma Alarms there are a few different ones.
If it’s not locking the door and it’s got some contacts on the hinge side give them a good clean. Make sure the spring in the contacts hasn’t gone rusty and failed. You can buy new units on eBay. If it’s got a cable to the door then it’s probably a broken wire.
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