2018-2024 Aviator & Navigator Headlight Module Failure: Outages, Faults, and Fixes

Symptoms of a Failing Headlight Control Module

A bad headlight control module can cause a variety of confusing symptoms. Because it controls so many functions, a failure can look like a bad bulb, a wiring issue, or a faulty switch. Watch for these common signs in your 2020-2024 Lincoln Aviator or 2018-2020 Lincoln Navigator.

• One or Both Headlights Won't Turn On: The most obvious symptom is a headlight that refuses to light up, even with a known-good bulb. This can happen to one side or both.
• Intermittent Flickering or Shut-Off: Headlights may flicker, dim, or turn off and on by themselves while driving. This can be random or triggered by bumps in the road.
• High or Low Beams Stuck: You may find you are unable to switch between high and low beams, or one mode is stuck on permanently.
• "Headlamp Fault" or "Advanced Front Lighting Features Temporarily Unavailable" Message: Your vehicle's instrument cluster will often display a specific warning message when it detects a problem with the HCM or the systems it controls.
• Adaptive Features Stop Working: For vehicles equipped with adaptive headlights, you may notice they no longer turn with the steering wheel or perform their auto-leveling sequence when you start the car.
• Daytime Running Lights (DRLs) or Side Markers Inoperative: The module also controls these auxiliary lights, and a failure can cause them to stop working, which was the subject of a recall for some 2022 Navigators.

Known Issues, Recalls, and Technical Service Bulletins (TSBs)

While these modules are generally reliable, there have been specific issues affecting the Lincoln Navigator and Aviator.

NHTSA Recall 22V-455 (and follow-up 25V-403)

Ford issued a recall for certain 2022 Lincoln Navigator models due to a software error in the headlight control module. This defect could cause the side marker lights and daytime running lights to stop working, increasing the risk of a crash. The fix was a software update performed by the dealer. A small number of vehicles were recalled a second time under recall 25V-403 because the initial software update was not applied correctly.

TSB for Headlamp Haziness

Technical Service Bulletin (TSB) SSM 49871 was issued for some 2020-2021 Lincoln Navigator Black Label vehicles that could develop a haze or light scratching on the headlamps after the factory transport protection film was removed. While not a module failure, it's a known headlight-related issue for this platform.

The Compatibility Trap: Adaptive vs. Standard Headlights

This is the single most important factor when replacing the headlight control module on a Lincoln Aviator or Navigator. These vehicles were available with at least two different headlight systems:

• Standard LED Headlamps
• Adaptive Pixel LED Headlamps (an optional upgrade)

These two systems use DIFFERENT control modules. A module designed for a standard headlight system will not operate an adaptive headlight correctly, and vice-versa. This will result in lost functionality and likely trigger fault codes. The initial data for this article contained multiple warnings about this, and it is a critical point for any buyer.

Buying a Used Headlight Control Module

A used OEM headlight control module can be a cost-effective and reliable alternative to an expensive new part, especially since aftermarket support for these complex modules is limited. Here’s what to look for:

1. Verify the Part Number: As mentioned above, this is the most critical step. The module is typically located on the bottom or back of the headlamp assembly itself. Access may require removing the front bumper or wheel well liner. Find the Ford/Lincoln part number (e.g., JL7Z-13C788-J, LC5Z-13C788-A) on the label and match it precisely.
2. Inspect the Connectors: Carefully examine the electrical connector pins on the used module. Look for any signs of green or white crusty corrosion, which indicates water damage. A module with corroded pins should be avoided at all costs, as it will likely fail prematurely.
3. Check the Casing: Look for cracks, deep scratches, or any signs that the plastic housing has been pried open. A compromised housing can allow moisture to enter and destroy the internal circuit board.
4. Buy from a Reputable Source: Purchase from an auto recycler that offers a warranty. This protects you in case the part is dead on arrival or fails shortly after installation. A warranty indicates the seller has confidence in their testing process.

Replacement and Programming

Replacing the headlight control module is a moderately difficult task for a DIYer, primarily due to the access challenges.

• Location: The HCM is almost always bolted directly to the headlight assembly. To access it, you will likely need to remove the front bumper cover and then unbolt the entire headlight housing from the vehicle.
• Installation Difficulty: 3 out of 5. While the module itself is simple to unbolt and swap, the labor to access the headlight assembly is significant.
• Programming Requirements: This is a critical consideration. According to I-CAR, when a module like this is replaced on a Ford or Lincoln vehicle, it may require programming. This can involve a process called "Programmable Module Installation" (PMI), where data from the old module is transferred to the new one, or programming with "As-Built" data specific to your vehicle's VIN. This procedure typically requires a dealer-level scan tool. After the module is installed and programmed, a headlamp leveling calibration may also be necessary. Failure to program the module may result in limited or incorrect headlight function.

Cost Comparison

Prices for a headlight control module can vary significantly. Here are some typical cost ranges:

Frequently Asked Questions (FAQ)