Dusk Sensor or Automatic Headlight Malfunction Indicator

Dusk Sensor

This is a Dusk Sensor or Automatic Headlight Malfunction Indicator symbol. Automatic headlights turn on or off depending on the amount of ambient light detected. This in turn is dependent on a properly functioning light sensor.

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The image in the symbol looks more like a standard household incandescent light bulb than anything automotive. It includes an exclamation point to highlight a problem and the text AUTO to point to the automatic headlight system. The symbol is shown in amber/yellow.

These symbols to the left are generally reserved as headlight out indicators, whether in green or yellow/amber. The exclamation point or the X indicate a light out. However, at least one manufacturer uses them to indicate a light sensor problem. Text in the vehicle’s message center will state this explicitly.

Note that in many cases, the sensor may simply be blocked or dirty. It will generally be found near the top center of the windshield. If this area is clean, a qualified service shop will be needed.

Similar Symbol

Don’t confuse the first symbol with this one to the right. Click here for more.

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Remember that only proper service and repair procedures will ensure the safe and reliable operation of your car. In addition, proper safety procedures and precautions, such as the  use of safety goggles, the right tools and the equipment should be followed at all times to eliminate the possibility of personal injury or improper service which could damage the vehicle or compromise its safety.

These posts are for information sharing purposes only, and should not be used in lieu of an OEM service manual or factory authorized service procedure. We are not in the auto repair business nor do we publish automotive service manuals. Nothing we include on these pages and posts has been reviewed, approved or authorized by any vehicle manufacturer.

Technology is always changing and what is current and accurate today may be literally out-of-date and inaccurate tomorrow. And when it comes to the current state of flux in the auto industry, nothing is more true.

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