Front radar sensor blocked (2024)

Sometimes heavy rain, snow/slush, or too many bugs will block the radar sensor of the OnGuard system, causing the issue you describe. I've experienced this a few times. If it is caused by rain, then when the rain lets up you can stop, turn off the truck, and when you turn it back on the system should function as normal. With snow/slush, I've had to stop and clean it off before. However, if you are traveling in messy weather it can prove to be an exercise in futility because it just get's blocked again. I've also had it occur when the unit did not appear to be dirty or blocked by anything obvious.

Having said all of that, you can override the system so that you can still use the cruise control. You turn the cruise on/off three times and then when you turn it on the 4th time you set the speed. The cruise will function normally but you will not have access to the other features of the OnGuard system (collision avoidance, warning for following distance, speed of vehicle ahead, etc.) A word of caution on this though: if a driver is over-reliant on the OnGuard system to beep for insufficient following distance or routinely allows it to decelerate automatically when approaching slower traffic, this could lead to an accident. Common sense and prudent driving habits would deem the OnGuard system unnecessary, but it is worth noting because a distracted driver who is used to the system taking over could be right up on someone while subconsciously waiting on the OnGuard to do its thing.

Front radar sensor blocked (2024)


What does front radar sensor blocked mean? ›

If this symbol and the message Radar sensor front Sensor blocked See Manual are displayed in the instrument panel, it means that the radar sensor is unable to detect other vehicles, cyclists, pedestrians and large animals in front of the vehicle and that the vehicle's radar-based functions may be obstructed.

Where is the Mazda front radar sensor? ›

The front side radar sensors are installed inside the front bumper, one on the left side and one on the right side. Refer to Front Side Radar Sensor (Search). The rear side radar sensors emit radio waves and detect the radio waves reflected off a vehicle approaching from the rear or an obstruction.

How to clean front radar sensors? ›

If weather permits, get regular car washes to keep the sensors on your car clean. For do-it-yourself cleaning, use a mild automotive-specific detergent so you won't damage your car's paint. Be gentle in cleaning fenders, because salt and sand can be abrasive on paint.

What is radar blockage? ›

The automotive radar may sometimes be covered with snow, dirt, or other obscurants, a state which we refer to as radar blockage. The radar must be able to detect blockage as a fault state.

What does it mean when the front radar is obscured? ›

A: Forward safety system disabled. Camera obscured. When the front windshield where the front view camera is located, front radar cover, bumper or sensor is covered with foreign material, such as snow or rain, it can reduce the detecting performance and temporarily limit or disable Forward Collision-Avoidance Assist.

Where is the forward collision sensor on a Nissan? ›

System mechanism

The Intelligent Forward Collision Warning system uses a radar sensor located behind the lower grille below the front bumper to measure the distance to a second vehicle ahead in the same lane.

What is the radar sensor on a Mazda? ›

The radar sensor (front) functions by detecting the radio waves reflected off a vehicle ahead or an obstruction sent from the radar sensor. The radar sensor (front) is mounted behind the front emblem.

Does Mazda have front sensors? ›

Traffic Jam Assist, front and rear parking sensors and 360° View Monitor are all included within Mazda CX-50 2.5 Turbo Premium Plus models.

Where is the front sensor on a Mazda CX-5? ›

The radar sensor (front) is mounted behind the radiator grille.

Where are front sensors located? ›

Front parking sensors are small devices that are located on the front bumper of a car. Front parking sensors measure the proximity to objects at the front of your car and warn the driver via audible beeps. The beeping tone gets faster and more frequent as you get closer to the object or obstacle behind you.

What is the function of the front radar sensor? ›

The front radar sensor facilitates fast, precise, and resilient object detection and tracking thanks to its long detection range, wide field of view, outstanding angle separability, and own chirp-sequence modulation feature. This makes it ideally suited to complex traffic scenarios.

What does unavailable front radar detection mean? ›

Typically that's an error message you'd see on a car with a collision avoidance, automatic braking or automatic cruise control function. In this case the car apparently uses radar t detect cars and obstacles ahead, and for some reason it's not working.

What blocks radar signals? ›

Mechanical jamming devices include chaff, corner reflectors, and decoys. Chaff is made of different length metallic strips, which reflect different frequencies, to create a large area of false returns in which a real contact would be difficult to detect.

What does FCM radar blocked mean? ›

The radar may not function normally if foreign object or dirt (snow or ice) is adhered on the radar or its surrounding area, or the road condition is bad due to a severe weather (heavy rain or snow).


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