Will any of the buttons on your remote fob work? Try putting the old battery back in and see what you get. Another way to reset the electronics is to remove the battery cables and tie them together (for 10 minutes, 2 hours, overnight?). Make sure to read your OWNER'S MANUAL first. It has instructions on how to replace the car battery and it's good practice to follow them any time you're disconnecting cables as Volvo electronics can be finicky.
2007 XC70, 206,000 miles
2002 V70XC, 130,000 miles, parts car
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