Volvo appears to use the same logic to program memory seats to remotes in all models. The following is the official description of the necessary steps:
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The remote control transmitter also controls the position of the power driver's seat and door ...

This appears to be the correct programming sequence for Volvo memory seat/remote programming:

The remote control transmitter also controls the position of the power driver's seat and door mirrors in the following way:

1. Adjust the seat to your preferences.

2. When you leave your vehicle, lock it ...