Citroen Berlingo multispace 1.4i Headlight Problems?

I have a Berlingo as noted above which is misbehaving - ? yet another electrical problem.
Sidelights work fine, but when select dipped headlights offside does not come on; however, when switch to full beam the bulb lights up fine.
Have tried several bulbs and even swopped them from side to side with no change (i.e. work fine in nearside light).
Am not overly technical, but willing to follow instruction in order to rectify problem.
Look forward to your helpful responses.
Regards, Don.