In transit mode before the main fuse was fitted PSA cars had a habit of the wipers giving one sweep when you turned the ignition on, might be worth disconnecting the battery for a while after removing that fuse then putting the fuse back in when reconnected, rebooting it might get it all happy again but no promises.
I'm normally against disconnecting batteries if at all possible (i use jump leads to maintain power during a battery change if all is well), but it was probably disconnected for the new heater matrix anyway.
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