Volvo S80 2.4T Siren Module repair
I also received the Alarm Service Required dashboard message on my Volvo S80 2.4T.
Decided to follow the video posted by SiRobb on Youtube and it paid off.
First you need a fitting battery pack, I bought this one from XcelPlustore: www.ebay.com/itm/152151139597
Then follow this guide by SiRobb: www.youtube.com/watch?v=vm_qGUegzw8
Partnrs: GP320BVH6A6 N2H280
Compatible with: 8637399 8622268 9452709 9162941