You need to carefully remove the "auto" button to access the bulb. The bulb is located inside the small round compartment with the slot on it. If you grab the small cover with a pair of needle nose pliers it should pull off. Then you must pull the bulb out of its socket. Small needle nose pliers will work to pull the bulb out, but you must be careful not to break the bulb. Hope this helps, Robert.

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Mercedes Benz Master Tech - Retired