The one you are talking about under dash, near the pedals, simply does the bulb blown warnings - ie headlight, brake light out.
The one i've shown behing the cubby, does the rest of the features and supplies power to the warning display.
So to sum up
Supplies power, does door open, low temp etc etc
This one is simply the bulb out ecu, the display works without it plugged in, but doesn't give you any bulb tests. I thought it was a security one, but the plastic security relay is just attached to the metal bulb warning one.