I don't remember seeing a light when taking one apart.
Having not done this for some time, here is what I remember
To remove unit..............
Remove wood trim from around gear lever. The best method I found for this was to lift it from the rear, which can be got to by opening the cover to the small compartment. When you lift this, the bezel around the gear lever will also come off.
If you want to remove the trim completely, just unclip all the electrical connectors for mirrors, boot, windows and parking sensors (if fitted).
With the trim removed or moved to one side there are two screws underneath the front of the trim, take these out.
You should now be able to remove the ashtray by lifting it up and pulling it forward, it also helps to have it open.
Be warned that the cigar lighter cables are quite short and very fiddly to get back in.
I hope this helps.