My rear wash wiper goes on its own lol

Is it a fault with our rear wash wiper or central locking or both ?

Could be wiring at boot causing issue ,if it’s rubbed through you maybe still have warranty for these issues , Advise check with dealer

Damaged wiring where it passes through into tailgate is a common fault .

Check fuse #6 in regard to locks .This shows to 2016 , might be the same . If not check h/book for fuse list

Peugeot Partner mk2 TP (Tepee) (from 2014) – fuse box diagram
Year of production: 2014, 2015, 2016

Fascia fuses
Peugeot Partner mk2 - fuse box - dashboard
Peugeot Partner mk2 – fuse box – dashboard
Fuse Ampere rating [A] Functions
1 15 Rear wiper
2 — Not used
3 5 Air bag
4 10 Air conditioning, diagnostic socket, mirror control, headlamp beam
5 30 Electric windows
6 30 Locks