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C450 mystery knob

Old 05-10-2017, 10:55 PM
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C450 2016
C450 mystery knob

Immediately to the right of the light switch there is a rotating knob (like the radio volume control) with the cruise control icon. I can't find the function of this knob in the manual. Anybody know what it is for?
Old 05-10-2017, 11:26 PM
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C43, GLS450
Originally Posted by ajb723
Immediately to the right of the light switch there is a rotating knob (like the radio volume control) with the cruise control icon. I can't find the function of this knob in the manual. Anybody know what it is for?
Brighten or Dims the instrument cluster
Old 05-11-2017, 04:25 AM
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2017 C43 sedan
And it only works at night

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