Disco 4 (LR4) Remote not working properly

Hi, It seems that since I coupled my caravan, both plugs, to my Disco. The remote will not centrally lock the car. If I lock the drivers door first from the passenger seat. Then get out she will lock and the wing mirrors fold in. When unlocking all doors open with the exception of the drivers door. Any ideas?
TPW.

Sounds as if drivers door hasn’t got power to it or the latch has failed