How do you replace the windshield washer pump on your 2009 Buick lucerne?

To replace the windshield washer pump on a 2009 Buick Lucerne, first, disconnect the negative battery terminal for safety. Remove the washer fluid reservoir by disconnecting any electrical connectors and hoses, then unbolt it from its mounting. Once the reservoir is free, detach the old pump from the bottom of the reservoir and replace it with the new one. Reassemble everything by reversing the steps, ensuring all connections are secure before reconnecting the battery.