Introduction
After a windscreen replacement, it’s very common for drivers to notice that something feels off. Maybe a warning light appears, or maybe the lane assist starts acting strangely. In most cases, it comes down to the camera alignment.
ADAS features rely on cameras and sensors that directly sit behind the windscreen. If their position changes even slightly during the replacement process, the accuracy can be impacted. That’s why proper ADAS calibration is important because without it, key safety systems may not respond exactly the way they should.
ADAS: What It Is and How It Functions
Advanced Driver Assistance Systems (ADAS) assist drivers by using technology in cars and trucks to help avoid accidents. They have uses that include camera or sensor-based systems that provide driver assistance in real-time through the use of software programs that monitor both traffic and environment.
Most often, a forward-facing camera is located behind the windshield; the forward-facing camera works in conjunction with radar sensors and other computer systems to detect bed lines, other vehicles and potential hazards.
The way these systems work relies on precise positioning; therefore any change made to the windshield can change the systems' ability to read or use the information from the camera and/or sensors to see the road ahead.
Common ADAS features include:
- Lane Departure Warning (LDW) – notifies you if your car begins to drift without signalling.
- Blind Spot Monitoring (BSM) – indicates if a car is positioned alongside you but outside your mirror view.
- Automatic Emergency Braking (AEB) – identifies crash risks ahead and can trigger braking to reduce impact.
- Adaptive Cruise Control (ACC) – regulates your speed to keep a sufficient distance from traffic in front.
All four examples of ADAS technologies must be correctly aligned for them to be effective.
Why ADAS Fails After Windscreen Replacement?
ADAS may not work properly after replacing a windscreen due to changing the position of the camera, even if it is only a couple of millimetre difference, affecting the way the system interprets what is in front of it.
When the windscreen is replaced, the existing glass is taken out, and a new one installed (this seems simple enough, but there are many other smaller items that can affect the alignment).
Below are examples of some of the smaller items that can affect alignment:
- As the windscreen's camera bracket is removed, it may shift position.
- The replacement windscreen may be of a different curvature and/or thickness to the one being removed.
- The adhesive that is applied to the windscreen may affect the alignment.
- The system may not be recalibrated after the windscreen has been installed.
Just a 1 - 2 mm difference in the camera position can and will cause misreading of lane markings or distance to lane markings. Just because a warning light may not come on does not mean that the system is still providing the same level of accuracy.
Common Signs that Your ADAS Is Not Working Properly
If your ADAS isn't calibrated correctly, you may notice subtle or obvious issues while driving.
Watch for:
- Warning lights appearing on the dashboard
- Lane assist behaving inconsistently
- Emergency braking activating too early or not at all
- Cruise control disengaging unexpectedly
- Messages like "system unavailable" or calibration errors
Even if these signs disappear, the system may still be misaligned. Accuracy matters more than alerts.
When Do You Need ADAS Recalibration?
ADAS calibration is required whenever the position of the camera or sensors may have changed.
This includes:
- After a windscreen replacement
- Following a front-end collision (even minor)
- When a camera or sensor is removed or replaced
- After suspension or wheel alignment work
- When dashboard warnings related to ADAS appear
If the system relies on a windscreen-mounted camera, calibration is not optional - it's necessary for safe operation.
Does Vehicle Type Affect ADAS Calibration?
Yes, and in some cases, significantly.
- ADAS-heavy vehicles: Luxury and high-tech vehicles rely heavily on cameras and radar. Calibration must meet strict manufacturer specifications.
- European and premium cars: Often require brand-specific ADAS solutions and OEM tools.
- SUVs and commercial vehicles: Their larger windscreen size means slight changes can produce bigger sensor alignment deviations.
- Older vs newer models: Newer vehicles integrate more advanced safety software. Older systems may be simpler but still require precise calibration.
The more advanced the vehicle, the less room there is for error.
Types of ADAS Calibration
There are three main types of calibration, depending on the vehicle:
- Static Calibration: Performed inside a workshop using specialised targets and alignment equipment. The vehicle remains stationary during the process.
- Dynamic Calibration: Performed while driving the vehicle at specified speeds under controlled road conditions.
- Dual Calibration: Some vehicles require both static and dynamic calibration to meet manufacturer standards.
The correct method depends on the car’s model, make, and system design.
Static vs Dynamic Calibration: What’s the Difference?
Static Calibration
- Requires controlled workshop environment
- Uses precision targets and measurement tools
- Takes longer to set up
- Highly accurate for camera alignment
Dynamic Calibration
- Conducted during road driving
- Uses onboard vehicle systems
- Faster in some cases
- May have environmental limitations
Many newer vehicles require both methods to ensure complete Advanced Driver Assistance Systems safety compliance.
The ADAS Calibration Process: Step-by-Step
Professional Advanced Driver Assistance Systems service follows a structured approach:
Step 1 - Run a full vehicle diagnostic scan
Before touching anything, the technician checks the system for existing ADAS faults. This ensures nothing unrelated is missed before calibration begins.
Step 2 - Check the manufacturer's requirements
Every vehicle is different. The technician reviews the specific calibration procedures set by the manufacturer rather than using a generic method.
Step 3 - Set up approved targets and equipment
Calibration targets and tools are carefully positioned according to factory measurements. Even minor placement errors can affect results.
Step 4 - Perform calibration
Depending on the vehicle, this could involve a static setup in the workshop, a dynamic road-based procedure, or sometimes both.
Step 5 - Verify on the road
After adjustments, the vehicle is tested to confirm the ADAS systems respond as expected in real-world conditions.
Step 6 - Provide documentation
A calibration certificate is issued for insurance and warranty records, confirming the process was completed correctly.
This approach ensures that windscreen replacement does not compromise system performance.
What Happens If ADAS Is Not Calibrated Properly?
Driving without proper calibration increases safety risks.
- Incorrect distance calculations
- Delayed or missed warnings
- False emergency braking
- Reduced effectiveness of safety systems
- Potential insurance complications
These systems are designed to prevent accidents - but only when they are accurately calibrated.
Can You Drive Without ADAS Calibration?
Technically, yes - but it's not advisable.
Short-term risks include:
- Delayed emergency braking
- Incorrect lane positioning alerts
Long-term risks include:
- Reduced collision prevention effectiveness
- Increased driver reliance on inaccurate systems
Importantly, no warning light does not guarantee calibration accuracy. ADAS safety depends on precise recalibration after replacement or damage repair.
How to Fix ADAS Issues After Windscreen Replacement?
If you suspect an issue:
- Book a professional ADAS diagnostic scan.
- Identify the correct calibration method for your vehicle.
- Perform static, dynamic, or dual calibration.
- Conduct final verification tests.
- Obtain documentation for insurance compliance.
Professional ADAS solutions ensure the system returns to manufacturer performance standards.
Who Can Perform ADAS Calibration?
ADAS calibration should only be performed by:
- Certified auto glass specialists
- Workshops equipped with ADAS-approved diagnostic tools
- Technicians trained in manufacturer-specific procedures
General mechanics may not have the required equipment or software. Incorrect calibration increases safety risk and may void warranties.
Industry Standards & Manufacturer Guidelines
In Australia, ADAS calibration follows strict guidelines:
- Manufacturer calibration specifications
- Australian vehicle repair safety standards
- Insurance-approved calibration procedures
- OEM diagnostic software
Following these guidelines ensures windscreen replacement and calibration meet compliance expectations.
FAQs
Q1: How do I know if my vehicle needs ADAS calibration after a windscreen replacement?
A: If your vehicle has a camera mounted on the windscreen, calibration is required after replacement because even minor alignment changes can affect how the system detects lanes and vehicles.
Q2: Can I drive without calibrating my ADAS system?
A: You can, but it’s not safe. The system may not respond correctly in real driving conditions, even if no warning lights are visible.
Q3: How long does ADAS calibration take?
A: Most calibrations take between 1 to 3 hours, depending on the vehicle and whether static or dynamic methods are required.
Q4: Can any mechanic perform ADAS calibration?
A: No. It requires specialised tools, software, and training based on manufacturer guidelines.
Q5: Does insurance cover ADAS calibration after windscreen replacement?
A: In many cases, yes. Calibration is often included as part of a compliant windscreen replacement service.
Q6: Will incorrect calibration affect emergency braking?
A: Yes. Systems like AEB rely on accurate camera alignment, and incorrect calibration can delay or misjudge braking.
Conclusion
ADAS are designed to prevent accidents - but only when correctly aligned. After windscreen replacement, even slight camera movement can compromise safety.
Ignoring calibration can lead to inaccurate warnings, unexpected braking, or systems reacting at the wrong time. That’s not something any driver wants to discover in real traffic. Professional Advanced Driver Assistance Systems calibration brings everything back into alignment, confirms the system meets manufacturer standards, and helps maintain long-term vehicle safety.
If your Advanced Driver Assistance Systems feels different after replacement - even slightly - it's worth having it checked properly. Small inconsistencies can point to larger accuracy issues. When it comes to safety technology, precision really does matter.