What Is ADAS?
ADAS stands for advanced driver assistance systems. These are safety features such as lane-departure warning, lane-keeping assist, automatic emergency braking, adaptive cruise control, and traffic-sign recognition. Many of them depend on a camera mounted on the windshield, usually behind the rear-view mirror, that looks at the road ahead.
- Many vehicles from the last several years have a forward-facing camera mounted at the windshield.
- When the windshield is replaced, the camera is removed and reinstalled, and its view can change slightly.
- Calibration realigns the camera so the safety systems read the road correctly.
- Calibration can add time and cost to a replacement. Ask about it before you book.
Why Calibration Matters After a New Windshield
Even a tiny difference in how the camera sits or looks through the glass can change how it judges distances and lane lines. If it is not calibrated, features like lane keeping or automatic braking may behave incorrectly, or the vehicle may show a warning light. Vehicle makers generally specify calibration after a windshield replacement for vehicles with these systems, and following the manufacturer's procedure is considered best practice.
Static vs. Dynamic Calibration
| Type | How it works | Notes |
|---|---|---|
| Static calibration | Done in a shop with the vehicle parked in front of printed targets set at exact distances. | Needs a level space and special equipment. |
| Dynamic calibration | Done by driving the vehicle on suitable roads at set speeds with a scan tool connected. | Needs clear lane markings and good conditions. |
| Both | Some vehicles require static and dynamic calibration. | Depends on the manufacturer. |
Which type your vehicle needs depends on the make, model, and year. The installer or the manufacturer's procedures decide.
Signs Your Vehicle May Need Calibration
- A warning light for the driver assistance system or lane assist after the replacement
- Lane-keeping or emergency braking that behaves differently than before
- Adaptive cruise control that does not work or acts oddly
- A camera or sensor icon on the dash
Does My Vehicle Need It?
A quick clue is a camera or sensor housing behind the rear-view mirror. Your owner's manual or the installer can confirm. When you ask for a quote, give the vehicle year, make, model, and trim, and ask whether the price includes calibration.
Cost and Time
Calibration is sometimes included in the replacement price and sometimes billed separately. It can add anywhere from under an hour to a few hours of work, and commonly adds somewhere around $150 to $500 or more depending on the vehicle and the method. See the cost guide for typical ranges, which vary by installer.
Mobile Service and Calibration
Some dynamic calibrations can be done on the road after a mobile replacement. Static calibrations usually need a shop with the right equipment. If you want mobile service, ask whether your vehicle can be calibrated on site. See mobile windshield repair.
Questions to Ask an Installer
- Does my vehicle need ADAS calibration after a windshield replacement?
- Is it included in the price, and which type will you do?
- Do you do it in-house, or send the car to another facility?
- Will you give me a calibration report showing it was completed?
- What glass are you using, and is it suitable for the camera?
Frequently Asked Questions
What is ADAS calibration?
It is the process of realigning a vehicle's forward camera and related sensors so driver assistance features work correctly. It is often needed after a windshield replacement.
Do I need ADAS calibration after a windshield replacement?
Many vehicles with a forward-facing camera do. Check with the installer using your vehicle's year, make, model, and trim.
How long does ADAS calibration take?
From under an hour to a few hours, depending on the vehicle and the type of calibration.
What happens if I skip calibration?
Driver assistance features may not work correctly, and the vehicle may show warning lights. Vehicle makers generally specify calibration after replacement.
Can ADAS calibration be done at my home?
Some dynamic calibrations can, but static calibration usually needs a shop with the proper targets and space.
See also: windshield replacement, cost guide, mobile service.