Where is the door lock remote control receiver for a 1997 Chevy Astro Van?

The receiver for a 1997 Chevy Astro van's remote door lock system isn't a single, easily identifiable box like a separate aftermarket system. Instead, the receiver is integrated into the body control module (BCM). The BCM is usually located under the dashboard, on the driver's side. It's a fairly large module and often has many connectors. You won't find a separate labelled "remote receiver" part. Any repair or replacement would involve the BCM as a whole.