In most cars, the switch on or near the rear-view mirror is used to control glare and visibility: flipping a small lever can switch between day and night modes, and newer mirrors may auto-dim or include extra features. The exact function depends on your vehicle model.
Common switch types you’ll encounter
Below is a quick guide to the two most common configurations you’ll see on rear-view mirrors.
- Manual day/night lever (flip tab): A small lever at the bottom or edge of the mirror. Flipping it toward the windshield reduces glare from headlights behind you at night, while flipping it back to the normal position gives a brighter daytime reflection.
- Auto-dimming and advanced mirrors: Many modern mirrors automatically dim in response to lighting conditions. Some also include a switch or button to disable auto-dimming or to access extra features built into the mirror, such as integrated controls or displays.
In practice, if your mirror has no obvious lever or button, it’s likely an auto-dimming type that operates via sensors rather than a manual switch.
Additional features that may share the mirror
On some vehicles, the rear-view mirror houses more than glare control. These features are often built into the reflective area or the housing and may appear as small buttons or labeled sections.
- HomeLink garage-door opener buttons: A set of three programmable buttons used to open and close compatible garage doors or gates. These are typically located on the underside of the mirror housing.
- Emergency/assistance buttons and other controls: Some models include SOS or other help buttons, sometimes near the HomeLink panel, to contact emergency services or vehicle assistance.
- Compass, temperature, or display readouts: Certain mirrors provide environmental or directional readouts, or an integrated display, which may be toggled or dimmed.
Not every vehicle uses these extras, and the exact layout varies by make and model. If you’re unsure, consult your owner’s manual or your dealership for model-specific guidance.
How to identify and use your specific mirror
Manual day/night lever
Look for a small lever at the bottom edge of the mirror. To reduce glare at night, tilt or flip the lever toward the windshield. Return it to the daytime position when you’re driving in daylight.
Auto-dimming or advanced mirror with extra features
If there’s no visible lever, your mirror is likely auto-dimming. If you see small buttons or a HomeLink panel, those are for additional functions such as garage-door opening or emergency assistance. For exact operation, check the vehicle’s manual or the manufacturer’s website for a model-specific guide.
Troubleshooting quick tips
If glare control isn’t working as expected, try these quick checks: confirm whether you have a manual lever or rely on auto-dimming, inspect for a hidden switch under the mirror housing, and consult your owner’s manual for exact instructions. If you still have questions, an authorized service center can identify the specific features for your car.
Summary
The switch on a rear-view mirror is typically a glare-control device—manual day/night flipping or auto-dimming—and, in many newer vehicles, may also house extras like HomeLink, emergency buttons, or displays. Understanding which type your car has helps you use it correctly and take full advantage of any built-in conveniences.