2025 Toyota Highlander — Bulb Sizes (Headlight, Tail, Fog)

Quick reference

Notes:

• Toyota leans heavily on sealed LED modules for the 2025 Highlander; many exterior lamps do not have a serviceable “bulb.” If a lamp above is listed as LED (sealed), the entire lamp assembly is serviced rather than a bulb.
• Trim availability (L, LE, XLE, XSE, Limited, Platinum) and market/plant variations can change details. Always confirm by VIN or owner’s manual before ordering parts.

LED vs halogen upgrade considerations

• Headlights: The 2025 Highlander uses sealed bi-LED projector headlamps. There is no removable bulb to “upgrade.” Any headlight performance change requires replacing the headlamp assembly with an OEM or compliant aftermarket unit. Avoid drop-in LED/HID kits—there’s no socket to accept them, and non-compliant conversions can be unsafe/illegal.
• Turn signals: If your trim has incandescent front/rear turn bulbs (7444NA/7440A), upgrading to LED typically causes hyperflash. Use either resistors matched to each circuit or a vehicle-specific CANBUS/anti-hyperflash LED. Heat-manage resistors away from plastics.
• Exterior wedge bulbs (reverse, license): Choose CANBUS-friendly LEDs to avoid bulb-out warnings or strobing from PWM. Look for 360° emitters for license plate lights and high-output, focused designs for reverse lights.
• Interior: Many 2025 models ship with OEM LED interior lighting. If yours has halogen, “CANBUS” LEDs help prevent faint glow with doors closed. Observe polarity—flip the bulb if it doesn’t light.

How to replace each bulb

• Low/High beam headlight: Sealed LED—no bulb to replace. For failures, remove front fascia/trim as needed and replace the headlamp assembly. Calibrate aim after installation.
• DRL: Integrated LED within the headlamp; serviced with the headlamp assembly.
• Fog light: Where equipped, the LED fog is a small module at the lower bumper. Access from underneath after removing a few splash-shield fasteners; unplug and swap the module. L/LE may not have fogs.
• Front turn signal: If your vehicle uses a bulb, access is typically behind the fender liner. Turn the wheel, remove a few clips, twist the socket counterclockwise, and replace the 7444NA/7440A bulb. Test before reassembling.
• Rear turn/brake/tail: Most trims are sealed LED within the outer tail lamp. If your trim has serviceable bulbs, open the liftgate, remove the two 10 mm bolts holding the outer lamp, slide straight back to release pins, then twist out the affected socket.
• Reverse light: Usually in the inner liftgate lamp. Open the liftgate and pop the small access panel on the inside trim to reach the 921 bulb socket; twist out, swap, and test.
• License plate: From outside, gently pry the lens or from inside the liftgate access the socket. Replace the 168/194 bulb, ensuring the gasket is seated to keep water out.
• Side markers: Integrated LED; serviced with the corresponding headlamp or tail lamp assembly.
• Interior map lights: Carefully pry the lens, pull the 194/168 wedge (if equipped), and insert the new bulb. Verify polarity for LEDs.
• Interior dome (2nd row): Pry the lens, release the 31mm festoon (if equipped), and install the new lamp. Avoid touching LED chips with bare fingers.
• Cargo/rear dome: Access through the rear roof lamp lens; replace the 921 wedge (if equipped) and confirm function.

Common lighting issues for this generation

• Moisture/condensation in headlamps or tail lamps: A small amount can be normal after wet weather, but pooling or persistent fogging can damage LEDs. Verify vent caps, seals, and lamp housings; many cases are addressed under warranty.
• Hyperflash after LED turn upgrades: Use proper load resistors or CANBUS LEDs, and make weatherproof splices away from foam or wire looms due to heat.
• Flicker or “ghosting” with LED interior/exterior wedge bulbs: Choose bulbs marketed as error-free/CANBUS and ensure solid ground connections.
• Broken tail lamp locator pins: When removing the outer tail lamp, pull straight rearward—do not pry outward—to avoid snapping the alignment pins.
• Dim reverse lighting: Upgrading the 921 reverse bulbs to quality, high-output LEDs can markedly improve rear visibility without glare.

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