jsconiers

2018 S560. Active seats stopped working. any idea where I can start looking for issues?

BenzNinja

iTrader: (4)

likely the compressor stopped due to a leak it has a safety system to not overheat

With the a real diagnostics system all this is easy to diagnostic

carlosinseattle

This is your third problem reported in 3 months; auxilliary battery, rear seat outlet, and now the active seats. You might want to consider having your electrical system checked. You're playing whack-a-mole now.

VII

Yes pump has likely shutoff due to leak detection, you'll need diagnostics to turn it back on and then work to locate the leak.
You can get a thinkdiag for $100 that'll allow you to work on it yourself if you are so inclined.