Hiace SuperCustom Sunroof Problem

[Muzzie]

96 Hiace Super Custom Limited, has the 4 sunroofs. The rear two are actually a piece glass with a division in the middle so its like two. Works as one though.

It's meant to pop up at the back (giving a spoiler like effect) after electrically opening the blinds. The blinds cant be closed with the roof up, and can be moved manually if required.

The roof itself just suddenly stopped working one day. If I push the button to open it, (blinds open or closed) I can hear a relay clicking, but no signs of life. The blinds won't open if they're closed either.

Hoping that its a simple to fix common fault.

Is anyone aware of any known faults these have? Or things to look for to trace the fault?

Thanks