iPhone proximity sensor defective? Read this blog!

The iPhone proximity sensor, you may be thinking right now: what is that anyway? Or you know exactly what this sensor does and are looking for a solution because it is no longer working properly. Since the advent of Face ID, this sensor has become even more important. In this blog, we explain what the proximity sensor is, how to test if it’s faulty and what it means for Face ID and other features of your iPhone.

In this blog, we cover:

• What is the iPhone proximity sensor and what does it have to do with Face ID?
• How can I tell if the sensor or Face ID is faulty?
• Causes of problems with the proximity sensor and Face ID
• My proximity sensor or Face ID is not working, now what?

What is the iPhone proximity sensor and what does it have to do with Face ID?

The proximity sensor is at the top of your iPhone, next to the earpiece and selfie camera. Proximity literally means proximity. This sensor ensures that when you make a call and hold your iPhone near your ear or face, the screen automatically goes black. This prevents you from accidentally pressing buttons while making a call.

In iPhones with Face ID, the proximity sensor is part of the TrueDepth system. This system consists of multiple sensors, such as the infrared camera, flood illuminator and dot projector. Together, these ensure that Face ID works securely and accurately. When one of these components malfunctions, it can affect Face ID, screen behavior and other smart features.

How can I tell if the sensor or Face ID is faulty?

You often notice a faulty proximity sensor while making a call. The screen won’t turn off when you bring the phone to your ear, or the screen stays black after you take it away again.

For iPhones with Face ID, there may also be other signals:

• Face ID does not work or is temporarily disabled
• Your iPhone doesn’t recognize your face as well
• Screen reacts strangely while calling
• You get notifications about an issue with Face ID

If multiple features are not working properly at the same time, such as Face ID, auto brightness and screen behavior while calling, it may indicate a problem in the TrueDepth system.

Causes of problems with the proximity sensor and Face ID

There are several causes that cause these sensors to malfunction.

Fall damage
A fall can cause internal damage even without visible damage on the outside. Because the sensors must be precisely aligned, even a slight shift can cause problems.

Water damage
Moisture can affect sensors. Even light condensation or sweat can cause damage over time.

Screen protectors and cases
This is one of the most common causes these days. Especially thick or improperly placed screen protectors can block the sensors. This also applies to cheap protectors without a cutout.

Dirt, makeup and sunscreen
These can block the opening at the top of the screen. This makes the sensor work less well.

Software and iOS updates
After an update, Face ID may temporarily malfunction. A reboot or update usually resolves this.

Repairs
After a screen repair, the TrueDepth system may be misplaced. This can lead to Face ID problems and a malfunctioning proximity sensor.

My proximity sensor or Face ID is not working, now what?

Before you think about repairing, you can try these steps:

• Remove your screen protector and case
• Carefully clean the top of the screen
• Restart your iPhone
• Check if an iOS update is available
• Reset Face ID and set it up again

Does the problem persist? Then it is wise to have your iPhone checked. Sometimes a cleaning or proper alignment can be enough. In other cases, a part needs to be replaced.

At ThePhoneLab, we always do a free diagnostic first. Then we’ll discuss the best solution together. You’re not tied to anything and often you can take your device back the same day.