Thule V16 Slide Out Step not functioning

[Driventemple]

On our Fiat based PVC the Thule Step has a warning buzzer that sounds if you switch on the 'ignition' when the step is out.
I decided to use Lockdown to add the extra relay to automatically retract the step.
All connected up and ignition switched on - Success! The step retracted successfully.
Switched ignition off and it will not now extend.
The fuse is not blown
There is power to the switch
Connecting Red (power) to Purple (extend) leads has no result (to test if switch was suddenly faulty)
Any ideas would be welcome

 

[Tombola]

Is there another fuse behind the drivers seat in the floor

 

[Driventemple]

All fuses at B Pillar hae been checked and are OK

 

[Driventemple]

Problem now solved. I had removed the switch and not photographed which leads went to which pin! Doh!