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The most probable cause is a low battery if the vehicle is not running. But this may be "normal" for your unit. If this happens when the vehicle is running, you might need a quick check of the electrical system. The headlights draw a lot of current, and this will cause the voltage in the electrical system to "sag" or "dip" a bit. In a small lamp like an interior light, even a few tenths of a volt less "drive" on the lamp can be noticed. No panic here, but maybe put a voltmeter on the battery when the vehicle is running to make a quick check to be sure the charging system is working.

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17y ago

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