Ford F-150 Headlight Dimmer & Multi-Function Switch Guide (2014-2020)
Having trouble with your F-150's headlights, wipers, or turn signals? Your multi-function switch is the likely cause.
- The 'headlight dimmer switch' is part of the multi-function switch that also controls wipers and turn signals.
- The most common failure symptom is erratic wiper operation, especially wipers that won't turn off.
- Replacement is a simple DIY job that can be completed in under 30 minutes with basic tools.
- A major headlight recall (20C03) on 2018-2020 models is a software issue, not a problem with this switch.
Is Your F-150's Multi-Function Switch Failing?
If you're experiencing strange electrical issues with your lights and wipers, the multi-function switch is a common weak point on the 2014-2020 F-150. Even on trucks with relatively low mileage, this switch can fail. The most widely reported problem isn't with the headlights, but with the windshield wipers.
Common Symptoms of Failure:
- Erratic Windshield Wipers: This is the most common symptom. The wipers may continue to run on a delay setting even when the switch is turned completely off. You might also lose certain delay speeds or find the wipers cycling randomly after using the washer function.
- Inoperative High Beams: You may find that you cannot switch your headlights to high beams, or they get stuck on high beams.
- Turn Signal Problems: Your turn signals may fail to activate or not cancel after a turn.
- Headlight Issues: While less common, a faulty switch can lead to flickering headlights or a complete loss of high/low beam control.
Important Recall Information (NHTSA #20V097000)
There is a well-known recall for 2018-2020 F-150s with LED headlights, but it is NOT related to a faulty multi-function switch. This recall addresses a software problem in the Body Control Module (BCM) that prevents the daytime running lights from dimming correctly. The fix is a simple software update from a Ford dealer and does not involve replacing any parts like the dimmer switch.
Choosing the Right Aftermarket Part
When it's time for a replacement, you have a choice between a new OEM part from Ford (Motorcraft) or a new aftermarket part. The original Motorcraft switch is known to fail, sometimes within just a few years, so an aftermarket part is a very reasonable choice.
Aftermarket brands like Rostra Powertrain specialize in automotive electronics and are known for producing OE-quality components. A quality aftermarket switch can provide the same form, fit, and function as the original, often at a better price and with comparable or even improved reliability over the stock part that failed.
| Part Type | Estimated Cost |
|---|---|
| New OEM (Motorcraft) | $65 - $110 |
| New Aftermarket | $55 - $85 |
| Used OEM | $20 - $40 |
| Shop Labor | $100 - $150 |
Note: Prices are estimates and can vary based on location, supplier, and your truck's specific options (like rain-sensing wipers).
Frequently Asked Questions
Can I replace the multi-function switch myself?
Yes, this is a very DIY-friendly repair. The process typically takes less than 30 minutes and requires only basic tools like a 5.5mm 🎬 Watch: A simple $22 DIY fix using basic tools (or 7/32") socket and a T10 Torx driver. You simply remove the plastic covers around the steering column to access and replace the switch.
🎬 See this step-by-step combination switch replacement walkthroughWhy do my wipers run when the switch is off?
This is the most common sign of a failing multi-function switch in the F-150. The internal contacts wear out, causing a short or incorrect signal that makes the wiper system think it's still on a delay setting. Replacing the switch assembly is the correct fix for this issue.
🎬 Watch: How to fix wipers that won't turn offIs my headlight dimmer switch the same as the turn signal switch?
Yes. On the 2014-2020 F-150, the headlight dimmer (high/low beam), turn signals, and wiper controls are all part of one single assembly called the multi-function switch or combination switch.
Will a new switch fix the headlight recall on my truck?
No. The recall for 2018-2020 F-150s (20C03) is a software issue with the Body Control Module, not a physical part failure. Replacing the multi-function switch will not resolve the recall issue. You must have a Ford dealer update the software.
Helpful Videos
Technical Specifications
OEM Part Numbers: FL3Z-13K359-AC FL3Z-13K359-AA FL3Z-13K359-AB FL3Z-13K359-BC
Located on the left side of the steering column. Controls high/low beams, turn signals, and windshield wiper/washer functions. Secured by two T10 Torx screws.
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The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
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