See also:

Loss of a remote key
If either of the remote keys is lost, the other should be taken with the car to a Volvo retailer. As an anti-theft measure, the code of the lost remote key must be erased from the system. NO ...

Operating the tailgate manually
The power tailgate can be disconnected from the vehicle’s electrical system by quickly pulling the outer handle twice. The tailgate can then be opened/closed manually. ...

Horn
Horn - Press the steering wheel hub to sound the horn. ...