Automatic anti-glare rearview mirror (if so equipped)

Nissan Altima / Nissan Altima Owners Manual / Pre-driving checks and adjustments / Mirrors / Automatic anti-glare rearview mirror (if so equipped)

The inside mirror is designed so that it automatically dims during night time conditions and according to the intensity of the headlights of the vehicle following you. The automatic anti-glare feature is activated when the ignition switch is in the ON position.

The indicator light will illuminate when the automatic anti-glare feature is operating.

NOTE:

Do not hang any objects over the sensors 1 or apply glass cleaner to the sensors. Doing so will reduce the sensitivity of the sensors, resulting in improper operation.

See also:

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Reporting safety defects (US only)
If you believe that your vehicle has a defect which could cause a crash or could cause injury or death, you should immediately inform the National Highway Traffic Safety Administration (NHTSA) ...