Under the seats at the front there is a large white connector which ISTR you have to lift a lever on the side to uncouple. Disconnect the battery first, then release the seat connectors, give them a good squirt of Servisol switch cleaner then reconnect and disconnect the connector a couple of times. While you’re down there, make sure your carpets are dry as moisture down there can be a cause of that block being intermittent.
After you reconnect the battery you’ll have to move the steering wheel from one full lock to the other to get rid of the DSC error light.