micra 1.2 nats key code light

Hi, Just joined as have a first micra for the wife. It has had a new power steering unit fitted i think. It came with a document which warned to disconnect the battery when it was fitted or the key code lamp would come on after a few miles. And it does about 5 minutes later. Otherwise everything seems ok. Any ideas how to reset things to stop the lamp coming on?
 
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