I'm no expert by any means, but did you try the rear wiper with the tailgate open as well as closed?
Possibly a broken wire in the flexible conduit?
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Current fleet;
1998 Volvo 940 2.3 LPT (mine)
2003 Peugeot 406 2.2Hdi ( also mine )
2019 Citroen C3 ( wife's )
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