MOT & Your Car Windows: A Clear View Ahead

It's a common scenario: you're preparing for your car's annual MOT, and suddenly, a part of your vehicle decides to act up. In your case, the driver's window has decided to stay put, stubbornly in the 'up' position. This immediately raises a crucial question for any car owner: will this lead to an MOT failure? The short answer is, it's highly likely. While the days of mandatory hand signals might seem like a relic of the past, the functionality of your vehicle's windows, especially the driver's, remains a critical aspect of the MOT test. Let's delve into the specifics of what the MOT test requires regarding your car's windows and why this seemingly minor issue could indeed prevent your car from passing.

The MOT test is designed to ensure your vehicle meets minimum road safety and environmental standards. Every component is scrutinised, from the brakes and tyres to the lights and, yes, the windows. The underlying principle is simple: your car must be safe to drive, and clear, functional windows are paramount for the driver's ability to operate the vehicle safely and communicate effectively when necessary.

The MOT Test: An Overview of Window Checks

When your vehicle goes in for its MOT, the examiner isn't just glancing at your windows; they're performing a series of specific checks to ensure they comply with regulations. These checks cover several aspects, including the condition of the glass, the tint levels, and crucially, the functionality of the opening mechanisms. While all windows are important, the windscreen and the driver's side window receive particular attention due to their direct impact on driver visibility and control.

For the windscreen, the primary concern is any damage that obstructs the driver's view. Chips and cracks within the 'swept area' (the part of the windscreen cleared by the wipers) are meticulously measured. Damage exceeding a certain size (10mm in the 'A-zone' – the 290mm wide section directly in front of the driver – or 40mm elsewhere in the swept area) will result in a fail. Beyond the swept area, larger cracks or damage that could affect the screen's integrity might also lead to an advisory or fail.

Other windows, while not having the same strict 'damage in swept area' rules as the windscreen, must still be in a condition that doesn't significantly impair vision. Excessive scratching, discolouration, or delamination can be reasons for concern. However, the functionality of the opening windows, particularly the driver's, is where your current predicament comes into sharp focus.

Driver's Window Requirements: More Than Just a Pane

This is where your specific issue comes to the forefront. The driver's window is not merely a piece of glass; it's a vital operational component of your vehicle. For the MOT, the driver's window must be able to open and close. The regulations stipulate that the driver's window must be capable of being opened sufficiently to allow the driver to give hand signals, although this is rarely done in modern driving. More practically, it's essential for communication with emergency services, police, or toll booth operators, as well as for emergency egress from the vehicle. If your driver's window is stuck in the 'up' position, it means it cannot be opened at all, which is a direct contravention of this requirement.

While the 'hand signal' rule might sound antiquated, it underscores the need for the window to be functional. A window that cannot be opened means the vehicle does not meet the necessary safety standards for the MOT. This isn't just about convenience; it's about the driver's ability to react to unforeseen circumstances, communicate, or escape if the situation demands it. Therefore, a driver's window stuck in the up position would almost certainly lead to an MOT fail.

The same principle applies if the window is stuck in the 'down' position. While it can be opened, a window that cannot close compromises the vehicle's security, weather sealing, and potentially the safety of occupants (e.g., if something enters the vehicle unexpectedly). Both scenarios indicate a failure in the window's functionality.

Visibility Is Key: Windscreen and Other Windows

Beyond the operational aspect, clear visibility through all windows is paramount. Any obstruction, whether it's damage to the glass or excessive tinting, can compromise safety. The MOT examiner will check:

• Windscreen Condition: As mentioned, chips or cracks in the critical vision areas are a common cause for failure. The size and location of the damage are key.
• Wiper Functionality: Directly related to windscreen visibility, the wipers must clear the screen effectively, and the washer jets must work.
• Other Windows: While not as strictly regulated for minor damage as the windscreen, other windows must not be excessively damaged, obscured, or discoloured to the point where they impair vision for the driver.

It's worth noting that any stickers, sat-nav mounts, or other items that significantly obstruct the driver's view can also lead to an MOT fail or advisory, depending on their size and position.

Window Mechanisms: Functionality Beyond Just Opening

The functionality of the window mechanism itself is part of the check. This applies whether your windows are manual (crank handle) or electric. The mechanism should allow the window to open and close smoothly and fully. If the window motor is failing, the regulator is broken, or the switch is faulty, preventing the window from moving, it's a defect. The MOT test doesn't just check if the window is present; it checks if it works as intended.

Here's a simplified breakdown of common window issues and their likely MOT outcomes:

What About Tinted Windows?

Tinted windows are a popular modification, but they are strictly regulated for the MOT, especially on the front of the vehicle. The rules are in place to ensure adequate visibility for the driver and for others to see into the vehicle, which can be important for safety and security. Here's a quick guide:

• Windscreen: Light must be able to pass through by at least 75%.
• Front Side Windows: (Those on either side of the driver's head) Light must be able to pass through by at least 70%.
• Rear Side Windows and Rear Windscreen: There are no legal requirements for the darkness of tint on these windows. You can tint them as dark as you like, provided the vehicle has two working wing mirrors.

If your front windows or windscreen are too heavily tinted, it will result in an MOT fail. Examiners use special equipment to measure the 'Visible Light Transmission' (VLT) to ensure compliance.

Common Reasons for Window-Related MOT Fails

To summarise, the most frequent reasons for an MOT fail related to windows include:

• Driver's Window Inoperable: Stuck up or down, or otherwise unable to move.
• Windscreen Damage: Chips or cracks within the swept area that exceed legal limits.
• Excessive Tinting: Front windscreen or front side windows that are too dark.
• Obscured View: Stickers, mounts, or other items on the windscreen that significantly block the driver's view.
• Wiper/Washer System Failure: Wipers not clearing the screen effectively or washer jets not working.

Pre-MOT Checks for Windows: Don't Get Caught Out

Before your MOT, take a few moments to perform some simple checks on your windows:

1. Test All Windows: Operate every window, especially the driver's window, up and down fully. Listen for unusual noises or signs of struggle.
2. Inspect Glass for Damage: Carefully check your windscreen for any chips or cracks, particularly in the driver's direct line of sight. Also, check other windows for significant damage.
3. Check Tint Levels: If you have aftermarket tints on your front windows, ensure they are within the legal limits. If in doubt, consult a professional or consider having them removed.
4. Cleanliness: Ensure all windows are clean and free from excessive dirt or streaks that could impair vision.
5. Wipers and Washers: Activate your wipers and washer jets. Ensure the wipers clear the screen effectively without smearing, and that the washer jets spray adequately onto the screen.

Frequently Asked Questions About Windows and the MOT

Will a stuck driver's window always fail the MOT?

Yes, almost certainly. The driver's window must be able to open and close fully for the MOT. If it's stuck in either the up or down position, it will be considered a major defect and result in a fail.

Do all car windows need to open for the MOT?

No, only the driver's window is explicitly required to open. While other windows should ideally be functional, their inability to open typically results in an advisory or minor defect, not an automatic fail, unless they significantly impair vision or are otherwise unsafe.

What if my window is tinted?

Tinted windows are permissible, but there are strict legal limits for the windscreen and front side windows. The windscreen must let at least 75% of light through, and the front side windows at least 70%. If they are darker than this, your car will fail the MOT. Rear windows and the rear windscreen have no specific tinting limits, provided your vehicle has two working wing mirrors.

Can I use hand signals if my window doesn't open?

While the regulation for the driver's window ability to open is partly historical for hand signals, relying solely on hand signals in a modern vehicle is not practical or safe. The window must open for other reasons, such as emergency egress or communication. A non-opening window is a fail regardless of your ability to use hand signals.

What's the difference between an advisory and a fail for windows?

An MOT 'fail' means your vehicle does not meet the minimum safety standards and cannot be driven on the road until the defect is rectified and retested. An 'advisory' note means there's an issue that isn't severe enough to fail the test but should be addressed soon. For windows, a stuck driver's window is a fail, whereas a minor scratch on a rear passenger window might be an advisory.

My car has a small chip on the windscreen, will it fail?

It depends on the size and location of the chip. If it's larger than 10mm in the 'A-zone' (the 290mm wide area directly in front of the driver, swept by the wipers) or larger than 40mm in the rest of the swept area, it will fail. Smaller chips or those outside the swept area are usually advisories.

In conclusion, while it might seem like a minor inconvenience, a driver's window stuck in the up position is a significant issue for your MOT. The regulations are clear: the window must be operational for safety, communication, and emergency purposes. Your best course of action is to have the window repaired before your MOT appointment. Addressing this issue proactively will save you the hassle and cost of a retest and ensure your vehicle is safe and compliant for the road ahead.

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