Citroen DS3 2010 Rear wiper not working but moves when heated rear window is switched on

[Duncan DS3 2010]

Hi having problems with rear wiper
The switch won't make it move .
Heated rear window switch makes the wiper wipe randomly
Also wipes.randomly when driving
Will stop when wiper control switch is moved
Help please
Have tryed another wiper motor but still mot fixed .
Could this be a relay or something???

[mickthemaverick]

As it is working occasionally when window heater is turned on it suggests the motor is fine but you have a possible problem in the wiring to the back, maybe a bad earth or other issue in the loom. I'd carry out a BSI reset following the procedure in the link below first and then see how it is.

viewtopic.php?p=601679#p601679

[wheeler]

I'd bet you have a broken or damaged wire where it passes between the body & the tailgate, a known weak point as the wiring is flexing back all the time.
Pull the rubber boot back for a look at the wiring.