2019 Toyota Highlander Bulb Sizes

Quick reference

The 2019 Toyota Highlander, a popular choice for families and adventurers alike, offers a range of lighting options depending on its trim level. While many essential lights utilize long-lasting LED technology from the factory, some crucial illumination points, particularly on lower trims, still rely on traditional halogen bulbs. Understanding these differences is key whether you're replacing a burned-out bulb or considering an upgrade.

For instance, the low beam headlights are a significant differentiator. LE, XLE, and SE trims feature H11 halogen bulbs, providing a warm, yellowish light. In contrast, the top-tier Limited and Platinum trims come equipped with integrated LED low beams, offering a brighter, whiter light and superior longevity. Similarly, fog lights follow this pattern, with H16 halogens on lower trims and integrated LEDs on Limited and Platinum models. However, the high beam headlights consistently use 9005 halogen bulbs across all trim levels.

Many of the exterior lights on the 2019 Highlander are factory LED modules, meaning the bulbs are not individually replaceable. This includes the Daytime Running Lights (DRLs), brake lights, and tail lights. If these components fail, the entire LED assembly typically needs to be replaced. Conversely, front and rear turn signals utilize 7440A (amber) and 7440NA (amber) halogen bulbs respectively. The rear of the vehicle also features 921 halogen bulbs for the reverse lights and 168 bulbs for the license plate lights, both easily replaceable.

Inside the cabin, the 2019 Highlander generally sticks with traditional halogen bulbs for interior lighting. The dome light typically uses a DE3175 festoon-style bulb, while the map lights employ 194 wedge bulbs. These can be simple, cost-effective replacements or offer an easy entry point into LED upgrades for a crisper interior aesthetic.

LED vs halogen upgrade considerations

Upgrading your 2019 Toyota Highlander's halogen bulbs to LEDs can dramatically improve visibility and modernize its appearance. However, there are a few important considerations.

CANBUS Errors: Modern vehicles, including the 2019 Highlander, use a CANBUS (Controller Area Network Bus) system to monitor electrical circuits. LED bulbs draw significantly less power than halogens, which can trick the CANBUS system into thinking a bulb is out. This can trigger "bulb out" warnings on your dashboard or cause hyper-flashing for turn signals. To prevent this, you'll often need to use CANBUS-compatible LED bulbs or install load resistors in parallel with the LED bulbs.

Adapters Needed: For headlights and fog lights, simply replacing the bulb won't necessarily be enough. Some aftermarket LED kits may require specific mounting adapters to ensure proper fitment and beam pattern, especially in projector-style housings (common with halogen low beams). Always check the product specifications for any required adapters.

Beam Pattern: With halogen headlamps, the reflector or projector housing is designed for the specific light output of a halogen bulb. Installing an LED bulb with a different light source orientation can result in a scattered beam pattern, reducing effectiveness and potentially blinding oncoming drivers. Look for LED bulbs designed to mimic the filament placement of their halogen counterparts or consider projector-specific LED bulbs if applicable.

How to replace each bulb

• Low Beam (H11) and High Beam (9005): Access is usually from the engine bay. Twist the bulb counter-clockwise to remove, unplug the connector, and reverse for installation. Be careful not to touch the glass of new halogen bulbs.
• Fog Light (H16): Often accessed from underneath the front bumper or wheel well liner. Turn the wheel to gain access to the liner, remove a few clips, and then twist the bulb to remove.
• Front Turn Signal (7440A): Typically located behind the headlight assembly. Access from the engine bay, twist the socket counter-clockwise, remove, and pull the old bulb straight out.
• Rear Turn Signal (7440NA), Reverse Light (921), Brake/Tail Light: These are usually accessed by opening the rear liftgate and removing the tail light assembly. There are often a few bolts holding the assembly in place. Once removed, twist the individual bulb sockets to access the bulbs.
• License Plate (168): Usually accessed from the outside, often by carefully prying open a plastic lens cover with a small flat-head screwdriver.
• Front/Rear Side Marker (194): These small wedge bulbs are often part of a larger assembly or within the headlight/taillight unit. Access will vary but often involves twisting a socket.
• Dome Light (DE3175) and Map Light (194): Carefully pry off the clear plastic lens cover using a plastic trim tool or a small, flat-head screwdriver. The bulbs are usually visible and can be gently pulled or unclipped.

Common lighting issues for this generation

For the 2019 Toyota Highlander, common lighting issues are relatively few, given Toyota's reputation for reliability. However, some general points to be aware of include:

• Premature Halogen Bulb Failure: While not frequent, halogen bulbs (especially headlights and fog lights on lower trims) can burn out. This is a normal wear item, and lifespan can be affected by voltage spikes or frequent short trips.
• Corrosion in Sockets: Over time, moisture ingress can lead to corrosion in bulb sockets, particularly for exterior lights. This can cause intermittent operation or prevent a new bulb from lighting up. Inspect sockets for green or white buildup if a new bulb doesn't work.
• DRL/LED Module Failure: While less common due to their longer lifespan, if an integrated LED Daytime Running Light, brake light, or tail light module fails, it often requires replacing the entire assembly, which can be more costly than a simple bulb replacement.
• Flickering Aftermarket LEDs: If you've upgraded to aftermarket LED bulbs without proper CANBUS decoders or load resistors, you might experience flickering, hyper-flashing, or dashboard warning lights. This isn't a vehicle fault but rather an incompatibility issue with the new components.

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