Xiaomi robot vacuum cleaner bumper: where is located, how it works and what to do in case of malfunction

You just bought a Xiaomi robot vacuum cleaner and you noticed that it's getting worse at navigating space or making weird noises when it hits furniture? Maybe the problem is bumper, which is a key element in detecting obstacles. But where exactly is it, and how do you know if it's broken?

In this article, we will analyze the exact location of the bumper on popular models of Xiaomi robot vacuum cleaners (including Mi Robot Vacuum, Dreame and Viomi), explain its principles and show how to check its health, learn how to remove the bumper properly for cleaning or replacing without damaging the sensors, and what to do if the vacuum cleaner stops “seeing” the walls.

Spoiler: 90 percent of bumper problems are solved by simply cleaning the contacts or rebooting the device, but if you hear a characteristic crackle on impact, it's a mechanical breakdown, and you'll need more serious repairs.

What is a bumper in a robot vacuum cleaner and why you need it

The bumper (or impact sensor) is not just a plastic lining on the front of the body, it's a complex system that includes:

• 🔘 Mechanical part - spring or rubber shock absorber, softening shocks.
• 📶 Infrared sensors – determine the distance to obstacles (work at a distance of 5-10 cm).
• 🔌 Microswitches – triggered by physical contact with an obstacle.
• 🤖 Communication with the motherboard - transmits collision data to build a room map.

Without a proper bumper, Xiaomi’s robot vacuum cleaner becomes a blind assistant: it will fight against furniture, get stuck in corners, or refuse to move at all. For example, in Mi Robot Vacuum-Mop 2 Pro models, the bumper is integrated with the lidar, and its failure can lead to navigational malfunctions.

Interesting fact: in budget models (for example, Dreame) D9) The bumper often performs only a mechanical function, whereas in premium ones (e.g. Xiaomi Mi Robot Vacuum). X10+) It is equipped with additional ultrasonic sensors for accurate avoidance of obstacles.

Where exactly is the bumper: a visual scheme for different models

The bumper is always located on the front of the body, but its design and mounting depend on the model. Below is a detailed breakdown for popular lines:

The photo below shows what the bumper looks like on the Mi Robot Vacuum 1S (And you can see the two black rubber strips, which are the shock absorbers that are the first to take the hit:

⚠️ Warning: If your vacuum cleaner is no longer responsive to obstacles, don't rush to disassemble the bumper. First check if the sensors are blocked with dirt or hair. In 70% of cases, just wipe the front panel with a wet wipe.

How to check if the bumper works: 3 tests

Before disassembling the device, perform these simple checks:

1. Response test: Put your hand to the front of the vacuum cleaner at a distance of 5-10 cm. The correct bumper should slow down or stop the robot. If there is no reaction, the sensors do not work.
2. Physical Contact Test: Push the vacuum cleaner forward carefully to hit the wall. A proper bumper will give a slight click (switch off), and the absence of sound indicates a breakdown in the mechanical part.
3. Testing through the app: In Mi Home or Dreame, open the Cleanup Log, and if there's a lot of "Crash: Strong" entries, the bumper is either contaminated or defective.

If at least one of the tests fails, move on to cleaning or replacing, but first make sure that the problem is not the software failure:

Turn off and turn on the vacuum cleaner (hard reset)

Update the firmware through the Mi Home app

Check if Turbo mode is turned on (disables some sensors)

Remove dust from the front panel with compressed air-->

🔹 Key takeaway: If the vacuum cleaner doesn't respond to obstacles, but there are no errors in the log, the bumper sensors are the problem. If there are errors (for example, "Error 12" in Dreame), the motherboard or firmware is to blame.

Step-by-step: how to remove the bumper for cleaning or replacement

Disassembling the bumper is a delicate operation, errors can cause sensors to break or the plumes to rupture.

For Xiaomi Mi Robot Vacuum 1/1S/1C viomi V2/V3:

1. Turn off the vacuum cleaner and turn it down with the buttons.
2. Remove the side brush (turn counterclockwise).
3. Put a screwdriver rubber cap in the center of the front panel (under it is hidden the screw).
4. Untwisted Torx screw T5.
5. Carefully press the bumper from the sides - it will come out of the latches.

For Dreame. D9/D10/Z10 Pro:

1. Turn the vacuum cleaner over and remove the main brush (click on the levers on the sides).
2. Find 4 plastic latches at the corners of the front panel.
3. Put the bumper on a flat screwdriver on either side and pull up (not to the side!).
4. Disconnect the sensor plume (it is attached to the motherboard connector).

⚠️ Attention: In Dreame models Z10 Pro and Xiaomi X10+ If you're not sure about your skills, you should go to the service, because the wrong disconnection of the plume can disrupt the navigation system.

After the bumper is removed:

• 🧹 Clean the sensor contacts with a cotton swab soaked in alcohol.
• 🔍 Check the springs of shock absorbers – they should not be deformed.
• 🔧 If the bumper cracks, replace it with the original part (see article below).

💡

If the bumper still doesn't work after cleaning, try resetting the vacuum cleaner to the factory settings, holding the Home and Spot Cleaning button simultaneously for 10 seconds.

Articles and where to buy spare parts for bumper

If the bumper is mechanically damaged (cracks, broken latches), it should be replaced. In the table below, the original parts for popular models are:

🔹 Important: When buying, make sure that all fasteners (screws, latches, shock absorbers) are included in the kit. Cheap non-original bumpers often come without them.

If you haven’t found the original spare part, you can consider compatible analogues:

• 🛒 For Mi Robot Vacuum 1S It's a bumper from Roborock. S5 (articular RR6120BM).
• 🛒 For Dreame. D9 — Dreame bumper F9 (full compatibility).

Critical information: In models with lidar (for example, Xiaomi) X10+) Replacing the bumper requires calibrating the sensors through the service menu, and without that, the vacuum cleaner will wander around the room.

Typical bumper malfunctions and how to fix them

The bumper breakdown symptoms can be divided into mechanical and electronic.

1. Mechanical breakdown

• 🔧 A cracked bumper case → Replace with a new one (see the articles above).
• 🔧 Broken springs/shock absorbers → Can be temporarily replaced by springs from ballpoint pen (diameter 0.5-0.7 mm).
• 🔧 Sensor pollution → Clean with a cotton swab with isopropyl alcohol.

Electronic failures

• 🔌 The IR sensor is not working. → Check the chain with a multimeter (resistance should be 5-10 kOhm).
• 🔌 Error "Sensor Error" in the application → Re-surface the vacuum cleaner or reset the settings.
• 🔌 The bumper does not return to its original position. → Lubricate the mechanism with silicone lubrication (do not use it) WD-40!).

📌 Key takeaway: If the bumper doesn't work after cleaning and replacing, it may be in the motherboard, and you'll need to be diagnosed at a service center.

Frequent Bumper Repair Mistakes and How to Avoid Them

Many users make the same mistakes when working with the bumper.

⚠️ Warning: Never pull the bumper to the sides, it will break the plastic latches. It is removed only by moving up (for Dreame) or on yourself (for Xiaomi Mi Robot).

• ❌ Use metal screwdrivers → They scratch the body. Take a plastic mediator.
• ❌ Clean sensors with wet fabric → It's a short circuit. Just a dry cotton swab. + alcohol.
• ❌ Scotch cracks → It'll block the sensors.
• ❌ Oil the machine → It attracts dust. Use silicone lubricant.

If you accidentally rip off the sensor plume, don't panic. Most models can solder it back (you need a 30 watt soldering iron and a roan solder).

PIN 1: +5V (red wire)




Pin 2: GND (black wire)




Pin 3: Signal (Yellow Wire)




PIN 4: NC (not used)

⚠️ Attention: In Xiaomi models X10+ dreame Z10 The bumper plume is integrated with the lidar, and if you damage it, the vacuum cleaner will lose the ability to map the room.

FAQ: Answers to Frequent Questions About Xiaomi Robot Vacuum Cleaner