I would like to activate seat massage using VDASH.
How do I know if a given car has a seat massage preparation?
In general, check the wiring diagram and compare with the reality.
Then you just enable massage, plug the proper seats in.
You typically need to "sleep" the car for 5 minutes in order to accept CEM changes done.
VIN YV1A22ML6H1XXXXXX
Model S90
Year 2017
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However, this is not a condition that this question and answer can only be applied to this car.