Parking Brake Malfunction - Contact Workshop!

[snapdragon]

I now have a "Parking Brake Malfunction - Contact Workshop!" message, continuous alarm sound and many flashing lights on the cluster.

I have had a problem with the connector getting damp and corroded in the past and it is is on the same left side but this time it looks OK and have cleaned anyway to no avail. Also did various adaptions in VCDS and this side never operates.

I have measured with a multimeter pins 1 and 4 from the caliper and there is 0 ohms resistance. I thought this was a good sign, so connected 12v jump leads from the car battery to these pins and just get a spark which ever way round. It does sound like something tries to move inside.
Now I am wondering if the centre two pins fire a relay or something?
Does anyone have any idea how to test further?

Thanks.

   Address 53: Parking Brake       Labels: 4E0-910-801.clb
Control Module Part Number: 4E0 910 801 D    HW: 4E0 907 801 B
  Component and/or Version: EPB  A4EC0230   H03 0230
           Software Coding: 0000221
            Work Shop Code: WSC 00097 210 194805
                      VCID: 20446925F395753E51-8074
Fault Codes have been Erased

02432 - Supply Voltage for Left Parking Brake Motor (V282) 
            012 - Electrical Fault in Circuit - MIL ON
             Freeze Frame:
                    Fault Status: 11111100
                    Fault Priority: 1
                    Fault Frequency: 11
                    Reset counter: 209
                    Mileage: 58528 km
                    Time Indication: 0
                    Date: 2016.01.22
                    Time: 16:50:31

             Freeze Frame:
                    Voltage: 11.08 V
                    Count: 86