In today’s modern vehicles, advanced driver assistance systems (ADAS) play a crucial role in enhancing safety and reducing the risk of accidents. One such system is the collision mitigation braking system (CMBS), which helps detect potential front-end collisions and responds accordingly by alerting the driver, applying brakes automatically, or reducing vehicle speed. While these systems are beneficial, there are circumstances where drivers may want to turn off the collision mitigation system temporarily or permanently — whether for technical troubleshooting, off-road driving, or personal preference.
This detailed guide explains how to disable the collision mitigation system on various vehicle models, the implications of doing so, and alternatives to complete system disablement.
Understanding the Collision Mitigation Braking System
Before exploring how to turn off the system, it’s essential to understand what a collision mitigation system does. These systems generally include sensors, cameras, and radar that monitor the environment around the vehicle and identify potential collision risks.
Key Components of Collision Mitigation Systems
- Front Radar and Camera Sensors: Detect vehicles and obstacles ahead.
- Control Module: Processes data and determines necessary action (like applying brakes).
- Driver Alerts: Includes visual, audio, and haptic warnings.
- Automatic Braking Systems: Activates brakes if the driver does not respond fast enough.
Why Manufacturers Recommend Keeping the System On
Manufacturers equip vehicles with collision mitigation systems to reduce accident frequency and severity. Many insurance programs offer discounts for vehicles with active ADAS, and studies from organizations like NHTSA confirm these systems save lives.
However, situations may arise where deactivating or disabling the system is necessary or preferred.
Reasons for Turning Off the Collision Mitigation System
There are legitimate reasons why a driver or mechanic may wish to turn off or disable the collision mitigation braking system.
Off-road and Specialized Driving
In off-road, towing, or construction scenarios, false alerts and unnecessary braking can be detrimental. For instance, when driving slowly in rough terrain or backing into tight spaces, automatic braking can be more of a hindrance than assistance.
System Calibration and Maintenance
To allow for recalibration after windshield replacement or sensor damage, dealerships often disable the collision mitigation system temporarily to perform diagnostics or updates.
Driver Personalization
Some experienced drivers prefer to manage the vehicle manually without interference from automatic systems — even if it means taking on more responsibility to prevent collisions.
Malfunction and Diagnostic Testing
Sometimes, drivers need to disable the system to isolate and troubleshoot mechanical or electronic flaws. This can help determine if the issue is related to CMBS sensors or the vehicle’s central control unit.
How to Turn Off the Collision Mitigation System: Step-by-Step Guide
There is no one-size-fits-all method for disabling CMBS, as the steps vary between vehicle makes and models. Below, we outline procedures for some of the most common systems.
Honda Collision Mitigation Braking System (CMBS)
Honda vehicles equipped with the Honda Sensing suite often allow limited user control over the CMBS.
- Turn on your vehicle and ensure you’re parked safely.
- Locate the “MAIN” button on the steering wheel — usually positioned to one side near the audio controls.
- Press and hold the “MAIN” button until the driver display shows a menu of the Honda Sensing functions.
- Use the arrow controls to navigate to the “Collision Mitigation” option.
- Select “Off” using the scroll button.
While this disables CMBS alerts, the automatic braking function can only be fully turned off via professional diagnostic tools.
Toyota Safety Sense and CMBS Alternatives
For Toyota models equipped with Toyota Safety Sense, including features such as Pre-Collision System (PCS), the process is similar but slightly varied.
- Ensure the vehicle is in park and stable.
- Push the “Menu” button on the steering wheel repeatedly until you reach the vehicle settings screen.
- Navigate to the “PCS” (Pre-Collision System) option in the safety menu.
- Select the “PCS Off” option.
This disables the system for 48 hours, after which it automatically reactivates.
Subaru EyeSight System
Subaru’s integrated EyeSight driver assist system includes collision mitigation features that can be turned off for short durations.
- Press and hold the “EyeSight button” (usually located on the dash or steering column) until a warning message appears.
- Confirm the system’s disablement.
Once off, EyeSight’s automatic braking functions are disabled until the ignition is restarted or a fault condition resets the system.
Generalized Procedure for Other Manufacturers
While procedures differ, the core structure is usually similar:
- Access the vehicle’s display screen or steering wheel controls.
- Navigate to Driver Assistance Settings.
- Locate the Collision Avoidance or Collision Mitigation function.
- Choose to disable, reduce sensitivity, or adjust alert level.
If the system cannot be disabled via a dashboard setting, advanced tools or dealership access may be required.
Advanced Methods: When Basic Disabling Isn’t Enough
Some vehicles have non-user-accessible CMBS disable options. In these cases, advanced technical methods are necessary.
Using OBDII Scanners and Diagnostic Tools
Automotive technicians often use OBDII scanners like the BlueDriver or Bosch KTS line that connect with a vehicle’s computer to manage system parameters. Using these devices:
- Connect the OBDII scanner to the OBD port located beneath the steering wheel.
- Launch the associated application and navigate to Driver Assistance Systems Calibration.
- Locate the option to disable the CMBS temporarily or permanently (based on software options available).
This method requires knowledge of ADAS diagnostics and should ideally be performed by a professional.
Sending Commands through Manufacturer-Specific Software
Certain vehicle brands (such as BMW or Mercedes-Benz) require proprietary software to fully disable CMBS settings. Dealerships use software like BMW GT1, ISTA, or Mercedes XENTRY Connect for such configurations.
For Independent Technicians:
- Access is limited unless using tools compliant with manufacturer protocols.
- Requires subscription or access rights for specific calibration programs.
Risks and Considerations of Disabling Collision Mitigation Systems
Before opting to turn off the collision mitigation system, it is vital to be informed about the potential consequences of doing so.
Safety Compromises
By deactivating the CMBS, drivers assume full responsibility for detecting and responding to potential obstacles. This may lead to:
– Increased risk of low-speed collisions, especially in traffic-heavy situations.
– Delayed reaction time in high-speed or emergency conditions.
Legal and Warranty Implications
Tampering with built-in vehicle safety systems may:
– Invalidate parts of your manufacturer warranty.
– Cause issues in future accident claims if automatic safety features played a role in your driving history or the incident under review.
Regulatory Concerns
Some countries or states have regulations mandating the presence of certain safety systems. Tampering may lead to:
– Non-compliance during vehicle inspections.
– Penalties for vehicle registration renewal.
Alternative Solutions: When You Can’t (or Shouldn’t) Turn Off CMBS
For those uneasy about disabling the system entirely, several alternative strategies are available.
Adjustment of System Sensitivity
Many modern vehicles allow users to select the system’s sensitivity level — usually under three options:
- High: Frequent alerts and quicker auto-braking.
- Medium: Balanced between responsiveness and comfort.
- Low: Limited alerts, ideal for experienced drivers.
This provides customization without losing essential safety features.
Temporary Disabling Instead of Permanent
As in the case of Honda, Toyota, and Subaru, these systems often return to active mode during ignition cycles or after set intervals. This ensures the system remains functional during normal road conditions.
Use of Toggle Switches or Physical Sensors Covers (Not Recommended)
Some vehicle owners place physical covers over radar or camera units temporarily as a simple workaround. However, this can lead to warning indicators and error messages in the dashboard computer, which is not advisable.
Common Misconceptions About Collision Mitigation Systems
There are several widespread myths that cause unnecessary alarm or confusion around these advanced technologies.
Myth: Disabling Auto Braking Means You’re Always in Control
While disabling the CMBS removes automated interference, drivers must remember that braking distance itself depends on multiple factors, including tread condition, vehicle weight, and surface friction.
Myth: Once CMBS Is Off, You’re Free from False Alarms
Some drivers believe deactivating the entire CMBS stops all alerts. In reality, certain features like Forward Collision Warning may operate independently and continue to provide alerts even when CMBS is off.
Myth: Only Luxury Cars Have CMBS
In fact, many mainstream models across Honda, Mazda, Toyota, and even some Ford and Chevy lines include collision mitigation technology as standard or optional driver assist features.
Final Thoughts: When to Turn Off and When to Leave On
The collision mitigation braking system represents a significant advancement in vehicle safety. While full disablement may be appropriate in specialized driving scenarios or diagnostics, everyday drivers should utilize system customization features before opting to fully turn off this life-saving technology.
If you’re unsure whether to deactivate CMBS or how to proceed legally and safely, consult with an official dealership or certified ADAS technician. Understanding your system thoroughly allows for informed decision-making, improves safety, and ensures your vehicle remains compliant and roadworthy.
For drivers seeking greater control without sacrificing safety, modern systems provide enough flexibility through alert sensitivity or timed off-cycles. Use the tools wisely — and remember, even the most advanced collision mitigation system works best when supported by cautious, aware driving.
Always weigh the pros and cons before disabling any safety feature in your vehicle.
What is the Collision Mitigation System in vehicles?
The Collision Mitigation System (CMS) is an advanced driver-assistance feature designed to reduce the likelihood and severity of frontal collisions. It typically uses a combination of sensors, radar, and cameras to detect potential obstacles, such as vehicles, pedestrians, or stationary objects, in the vehicle’s path. When an imminent collision is detected, the system provides warnings to the driver and, in some cases, automatically applies the brakes or adjusts the throttle to mitigate or avoid the impact.
This system is part of a broader set of safety technologies known as Collision Avoidance Systems (CAS) or Forward Collision Warning (FCW). It is integrated with other features like automatic emergency braking (AEB), adaptive cruise control (ACC), and pedestrian detection. While the system enhances road safety significantly, some drivers may want to disable it for various reasons, such as personal driving preferences or specific driving conditions.
When should I consider turning off the Collision Mitigation System?
You might consider turning off the Collision Mitigation System in certain driving situations where it may interfere with normal driving behavior or vehicle performance. For example, during off-road driving or in extremely poor weather conditions like heavy snow or torrential rain, the system might misidentify objects or activate unnecessarily, which can be distracting.
It’s also not uncommon for some drivers to disable the system temporarily when performing specific maneuvers like trailering or driving in slow-moving parades, where close proximity to other vehicles is intended and expected. However, it’s important to remember that the system is a safety feature designed to protect you and others on the road. Turning it off should only be done with careful consideration and re-enabled as soon as the situation no longer warrants its deactivation.
How can I turn off the Collision Mitigation System in my vehicle?
The method for turning off the Collision Mitigation System varies by vehicle make and model. In most modern vehicles, the system can be disabled through the infotainment system or a dedicated driver-assist control panel. Look for options labeled as “Collision Mitigation,” “Forward Collision Warning,” or “Automatic Emergency Braking” and select the disable or off setting.
Some vehicles may also have a physical button on the dashboard or steering wheel labeled with an icon representing a car and an exclamation mark or similar symbol. Pressing this button should bring up a menu where you can toggle off CMS components. Always refer to your vehicle’s Owner’s Manual for the precise steps, as deactivating the system may require confirmation or only disable certain features temporarily.
Can the Collision Mitigation System be turned off permanently?
In most vehicles, the Collision Mitigation System cannot be permanently turned off using the onboard settings. Manufacturers design the system to remain active by default as part of safety standards and regulatory requirements. Often, even after deactivating the system through the vehicle’s menu, it may reset to the default “on” position when the vehicle is restarted.
Permanent disablement typically involves specialized tools, dealership access, or modifications through a third-party tuning module, which is generally not recommended and may void warranties or violate local traffic laws. Disabling the system permanently also poses safety concerns, especially in urban driving or high-traffic environments where collision risks are greater. It’s best to disable the system only temporarily and only when necessary.
Are there any risks involved in turning off the Collision Mitigation System?
Yes, turning off the Collision Mitigation System can increase your risk of being involved in a frontal collision, especially if you’re unprepared for its absence. Since the system acts as a second layer of alert and automated assistance, disabling it removes these protections, which can be vital in situations where reaction time is limited or distractions occur.
Moreover, depending on local laws and insurance policies, turning off safety features like CMS may impact liability in the event of a collision. Some insurers may charge higher premiums if they determine the driver is at increased risk due to deactivated systems. Therefore, it’s important to weigh the potential convenience or comfort against the safety benefits the system provides.
Will turning off the Collision Mitigation System affect other safety features?
Disabling the Collision Mitigation System may impact other related safety systems in your vehicle, such as Adaptive Cruise Control, Automatic Emergency Braking, and Forward Collision Warning. These systems often work together to monitor and react to driving conditions, so turning one off can affect the performance or availability of others.
For example, if you disable the collision mitigation braking, adaptive cruise control might not function properly or could provide incomplete feedback to the driver. Similarly, some manufacturers restrict certain features unless the entire safety suite is enabled. Once you turn the system back on, these interdependent functions usually return to normal operation, but this depends on your vehicle’s integrated design.
How can I re-enable the Collision Mitigation System after turning it off?
To re-enable the Collision Mitigation System, go back into your vehicle’s settings menu or driver-assist control panel and find the CMS-related options. This is usually located in the same area where you turned it off—often under vehicle safety or driver assistance settings. Toggle the function back on, and confirm if prompted to reactivate it fully.
Alternatively, you may be able to reactivate the system by simply restarting your vehicle, as some models reset to default safety settings each time the engine is started. Check your Owner’s Manual to confirm this behavior for your specific model. It’s advisable to turn the system back on as soon as you no longer need it disabled to ensure maximum safety while driving in normal conditions.