Central Locking on the Sliding and Rear Door

Went out to the Van today and the front Door's will open as normal
but the Sliding Door and rear Door's remain locked. The Solenoid's in these Door's are not moving (i.e. making any sound) when the key is in the position to unlock them.

I took the inside panel off of the Driver's Door earlier.

There are 9 wires connected in a block which connect's to the Lock.

5 wire's on the outer leaf and 4 wires on the inner leaf of this block - they are all coloured the same i.e. Black and I cannot discern any spotting or other colouring to differentiate them. I bared them all in turn and found 4 of them had 11.7V in them as follows;

Top 1 outer 0
2 outer 11.7V
3 outer 0
4 outer 0
5 outer 0

Top 1 inner blank - no wire
2 inner 11.7V
3 inner 11.7V
4 inner 11.7V
5 inner 0

I presume there are two power wires going to each of the 3 Solenoids (passenger Dr, Sliding Dr, Offside rear Door) 1 to make the Solenoid pop the Lock to the openable position and 1 to make the Solenoid pop the Lock to the locked position.

There is a Steel Bulkhead in the Van plus literally all of my tool's are in the back of the Van to complicate matters further.

How am I going to get it open?