'98 v70 t5 to 2nd gen cross country front/rear seat swap

[precopster]

You won't have a code on a '98 V70 wearing 1999 or 2000 seats because the 1998 car is identical in the firing mechanism of the seats as 850s. There is no electrical connection to the seats' airbag system on a 92-98 850/V70/S70.

What you will have is an inability of any side airbag deployment as there is no side airbag module or crash sensors for side airbag deployment on your 1998 model. The older seats are fired purely by impact.

Later seats from 1999-2000 are fired electrically by the SRS system.

If it was the other way around you could fit an earlier seat to a later car and "trick" the module into thinking an airbag is there with a simple resistor across the terminal.