Rearview mirror ambient light
 

Hello. I recently purchased an 04 Cl55. I was wondering if anyone knew if there is a small amber ambient light on the rearview mirror? I see what I think is a recessed area for one but not sure. If so, mine is not functioning correctly. Any clarification would be appreciated. And if there is one, and is not functioning, has anyone ever attempted to fix it? Thanks for any input!