2024 Toyota Highlander Bulb Sizes (Headlight, Tail, Fog & More)

As an ASE-certified master technician, I regularly see late-model SUVs roll into the shop for lighting upgrades and replacements. The 2024 Toyota Highlander is a fantastic, reliable family hauler that comes heavily equipped with modern LED technology straight from the factory. However, depending on your specific trim level (LE, XLE, Limited, Platinum), you may still have some replaceable incandescent bulbs scattered around the vehicle.

If you're looking to replace a burnt-out bulb or upgrade your base-model halogen signals to crisp LEDs, this guide covers everything you need to know about the 2024 Toyota Highlander's lighting system.

Quick Reference Bulb Size Chart

The 4th generation Toyota Highlander (2020–present) relies heavily on integrated LED assemblies for its primary forward and rearward lighting. However, several auxiliary lights remain serviceable. Here is the bulb size guide for the 2024 model:

Note: Higher trims (Limited, Platinum) typically feature full LED exterior and interior lighting, meaning individual bulbs cannot be replaced without swapping the entire assembly. Lower trims (L, LE, XLE) utilize replaceable halogen bulbs for turn signals, reverse lights, and interior lighting.

LED vs Halogen Upgrade Considerations

If you own an LE or XLE trim and want to upgrade your remaining halogen bulbs to LED to match your factory LED headlights, there are a few technical considerations to keep in mind:

• Hyperflashing and CANBUS: Upgrading your front or rear turn signals (7444NA / 7440) to LED will almost certainly cause "hyperflashing" (rapid blinking). LEDs draw much less power than halogens, tricking the Highlander's computer into thinking the bulb is burnt out. To fix this, you will need CANBUS-ready LED bulbs with built-in resistors, or you will need to wire in external 50W 6-ohm load resistors.
• Polarity: Standard wedge bulbs like the 194/168 and 921 are often polarity-sensitive when upgraded to LED. If you plug the new LED in and it doesn’t light up, simply pull it out, flip it 180 degrees, and reinstall it.
• Color Matching: For reverse lights and license plate lights, look for 6000K pure white LEDs to perfectly match the factory LED headlights and DRLs.

How to Replace Each Bulb

• Headlights, Fog Lights, Brake Lights: Since these are integrated LED assemblies, there are no individual bulbs to replace. If one of these fails, the entire housing must be replaced. Fortunately, factory LEDs are designed to last the lifetime of the vehicle.
• Front Turn Signals: Accessible from under the hood behind the headlight assembly. Twist the bulb socket counterclockwise to remove it. Space is tight, especially on the driver's side near the battery, so take your time.
• Rear Turn Signals & Reverse Lights: Open the rear liftgate and locate the access panels on the inner tailgate and the outer body pillars. Pop the plastic covers off with a non-marring trim tool to expose the bulb sockets. Twist counterclockwise to pull them out.
• License Plate Lights: Located above the rear license plate. The small plastic housings can be carefully pried out, allowing you to twist the socket out and pull the 168 bulb straight out.
• Interior Dome/Map Lights: Use a plastic trim removal tool to gently pry off the clear plastic lenses. Be extremely careful, as the plastic tabs can be brittle. Pull the wedge bulbs straight down and push the new ones in.

Common Lighting Issues for this Generation

The 2024 Toyota Highlander has an incredibly reliable electrical system, but there are a few minor quirks to watch out for:

1. Moisture in the Taillights: Occasionally, a factory seal on the rear LED taillight assemblies may fail, leading to condensation inside the lens. If your Highlander is under warranty, Toyota will typically replace the assembly for free.
2. LED Turn Signal Interference: Poor quality aftermarket LED turn signal bulbs can sometimes emit radio frequency (RF) interference, causing static on your radio or interfering with the TPMS (Tire Pressure Monitoring System) sensors. Always buy high-quality, shielded LED bulbs.
3. Burnt Out Halogen Reverse Lights: The standard 921 reverse bulbs on lower trims are notorious for being a bit too dim for backing up in pitch-black conditions. Upgrading these to high-output LEDs is one of the most popular and practical mods for this generation.

If you run into wiring issues, assembly damage, or prefer to have a professional handle your upgrades, don't risk damaging your vehicle's complex electrical system. Find a trusted shop on Repairius.