Bring the other end of the Bit Light cable over and tuck it into the side of the
roof section. Connect it to the 6-port expansion board above the front entrance,
then turn the AA Battery Pack ON to test the ground floor light is working OK.
Note: If you experience any issues with the lights not working and suspect an
issue with a component, please try a different port on the expansion board to
verify where the fault lies (with the light or expansion board). To correct any
issues with expansion board ports, please view the section addressing
expansion board issues on our
online troubleshooting guide.