e3 is left seat memory and backrest control only. note that all the seat functions go through the ecu, so it may have some logic that is pulsing it like that (ie, shorted wire or connector is sending an activation signal, and ecu is trying to comply but not getting results so cycling).
I have a copy of the applicable schematics but it's a 22 MB pdf. you used to be able to download from cannell.co.uk but site is down.
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