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What is the red knob below the rear-view mirror?

April 26, 2017Knob mirror rear-view red

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What is the red knob below the rear-view mirror?

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This is commonly referred to as the “clown nose”. It houses a LED that flashes when the alarm is armed (IF you have the alarm installed). For cars without the premium package (which includes the auto-dimming rear view), it also functions as the dimming lever- Just twist it!