Where is the radar cruise control sensor?
In most modern cars, the radar sensor for adaptive cruise control sits at the front of the vehicle, typically centered behind the bumper or grille. Locations vary by make and model, but the sensor is usually hidden behind a small plastic window in the front end.
Radar-based adaptive cruise control (ACC) uses a 76–77 GHz radar module, often combined with chassis cameras or other sensors in a driver-assistance suite. The sensor must have a clear line of sight to the road ahead, so it is mounted behind trim that allows radio waves to pass and is protected from road debris. This article explains where you’re most likely to find it and how to identify it on your vehicle.
Common locations for the radar sensor
Common mounting zones across brands include the following:
- Center of the front bumper, just behind the lower grille or in a dedicated radar recess
- Behind the front grille, often near the emblem or within a recessed module integrated into the bumper
- In some designs, tucked into the left or right side of the bumper or near the fog-light housing
- In select models, partially embedded in the headlight area or within a protective bumper cover
Radars are designed to be compact and are frequently behind a flat, non-reflective panel with a small transparent window. The exact geometry varies by model and generation, but the front-center location is the common thread.
How to identify the radar cruise control sensor on your car
To help you locate it on your specific model, use these practical steps. Before attempting to remove any trim, consult the owner's manual or a service diagram, and consider having a professional handle maintenance to avoid damage.
- Visually inspect the front bumper center area: look for a flat panel with a small transparent window or a recessed module behind the bumper cover
- Check the grille area or the emblem for a hidden sensor behind a dedicated plastic housing
- Look beneath the bumper near the lower grille or fog-light openings where a rectangular radar module is often mounted
- Consult the vehicle’s owner’s manual, service manual, or an online parts diagram for the exact sensor location for your trim
By design, the ACC radar module is shielded from the elements but requires a clean, unobstructed view of the road. Damage to bumper covers or failed trims can impair sensor performance, so professional inspection is advised if you suspect an issue.
Notes on variations by brand and technology
Some manufacturers pair radar sensors with cameras or lidars as part of a sensor fusion system. In many modern cars the radar is a single 77 GHz module, but some vehicles use multiple radar units for broader coverage and to detect vehicles at different angles. Always verify with the specific model year and trim, as placement can change across generations.
Brand-specific patterns (high level)
A few examples of common patterns across brands, for orientation purposes:
- Most mainstream sedans and SUVs place the radar module behind the front bumper center, focused through the lower grille
- Luxury brands may mount the radar in the grille housing or behind a branded badge area, sometimes with an additional radar around the sides for broader coverage
- Some models with headlights integrated sensors may position a small radar near the headlight cluster
These patterns are general and can vary widely; always check the official diagrams for your vehicle’s exact location.
Summary
The radar cruise control sensor is typically located at the front of the vehicle, centered behind the bumper or grille, in a protected but radio-transparent housing. Placement varies by model and generation, but it is generally in the front-center region to monitor traffic ahead. For exact location, consult the owner's manual or manufacturer diagrams specific to your vehicle.
