2023 Toyota Highlander Bulb Sizes (Headlight, Tail, Fog)

Quick reference

The 2023 Toyota Highlander, a popular mid-size SUV, primarily utilizes LED lighting technology across most of its trims. This guide will provide a comprehensive breakdown of the bulb sizes and types you'll find throughout your Highlander, noting any distinctions between trim levels and OEM options.

Headlights

For the 2023 Toyota Highlander, all trim levels come equipped with LED low beam and high beam headlights as standard. This means there are no halogen or HID (projector-style) options from the factory for the main headlights. The LED units are integrated and typically not serviceable as individual bulbs, but rather as complete headlight assemblies if they were to fail.

Fog Lights

Fog lights on the 2023 Highlander are also predominantly LED. However, on some of the lower trim levels, you might find halogen fog lights. If your Highlander has halogen fog lights, the most common size will be an H11 bulb. Always check your specific trim and owner's manual to confirm.

Daytime Running Lights (DRL)

All 2023 Toyota Highlander models feature LED Daytime Running Lights (DRLs). These are typically integrated into the headlight assembly and are not user-serviceable bulbs.

Turn Signals

Front and rear turn signals on higher trim levels of the 2023 Highlander are LED. However, some base models may still utilize 7440 halogen bulbs for the front and rear turn signals. It's important to inspect your vehicle to determine if you have LED or halogen turn signals. LED turn signals are often brighter and offer a quicker on/off response time.

Brake Lights and Tail Lights

Similar to the turn signals, the brake lights on higher trims of the 2023 Highlander are LED, while some lower trims might use 7440 halogen bulbs. The tail lights are universally LED across all trims of the 2023 Highlander, offering a distinct and modern look.

Reverse Lights

The reverse lights on the 2023 Toyota Highlander typically use 921 halogen bulbs. This is one area where halogen is still common, even on higher trim levels.

License Plate Lights

For illuminating your license plate, the 2023 Highlander uses 168 halogen bulbs.

Side Marker Lights

Both front and rear side marker lights on the 2023 Highlander are LED and are integrated into the headlight and tail light assemblies, respectively. They are not individually replaceable bulbs.

Interior Lighting

Inside the cabin, the 2023 Highlander proudly features LED lighting for both the dome and map lights across all trim levels. These provide a crisp, bright light, enhancing interior visibility.

LED vs Halogen Upgrade Considerations

If your 2023 Highlander has any remaining halogen bulbs (such as reverse lights, license plate lights, or turn signals on lower trims), you might be considering upgrading to LED for improved brightness, longevity, and a more modern aesthetic. Here are some key considerations:

• CANBUS Errors: Modern vehicles like the Highlander often have sophisticated CANBUS (Controller Area Network Bus) systems that monitor bulb functionality. When replacing a halogen bulb with an LED, the lower power draw of the LED can sometimes trick the CANBUS system into thinking the bulb is out, triggering a "bulb out" warning on your dashboard. To resolve this, you may need to install CANBUS-compatible LED bulbs or use load resistors/decoders. These mimic the power draw of a halogen bulb, preventing error messages.
• Adapters Needed: For some aftermarket LED bulbs, you might need specific adapters or connectors to ensure a secure fit and proper electrical connection, especially if the LED bulb base differs slightly from the halogen equivalent. Always check the product specifications and consult your vehicle's manual if unsure.
• Brightness and Beam Pattern: While LEDs are generally brighter, ensure that any aftermarket LED bulbs you choose have a proper beam pattern to avoid blinding oncoming traffic, especially for turn signals and reverse lights.

How to Replace Each Bulb

Replacing bulbs on the 2023 Highlander can range from simple to more involved, depending on the location. Always consult your owner's manual for specific instructions and safety precautions.

• Reverse Lights (921): Access is usually from inside the trunk/hatch area, behind the tail light assembly. You may need to remove a trim panel to reach the bulb socket.
• License Plate Lights (168): Typically accessed by removing a few screws from the lens cover on the rear bumper or tailgate.
• Front/Rear Turn Signals (7440 - if halogen): For front turn signals, you might need to access them from behind the headlight assembly in the wheel well by peeling back the liner. Rear turn signals are usually accessed from inside the trunk/hatch, behind the tail light assembly.
• Brake Lights (7440 - if halogen): Similar to rear turn signals, accessed from inside the trunk/hatch behind the tail light assembly.
• Interior Dome/Map Lights (LED): Generally, these involve carefully prying off the lens cover with a plastic trim tool and then directly replacing the LED module or bulb if it's a replaceable unit. Be gentle to avoid damaging the headliner or plastic.

Note: For the integrated LED headlights, fog lights, DRLs, tail lights (mostly), and side markers, replacement is usually not an option at the bulb level. If these components fail, the entire assembly typically needs to be replaced by a qualified technician.

Common Lighting Issues for this Generation

Given that the 2023 Toyota Highlander relies heavily on LED technology, traditional bulb-related issues like frequent burnouts are less common. However, some potential lighting concerns for this generation might include:

• LED Module Failure: While rare, individual LED diodes or entire LED modules within the integrated assemblies (headlights, DRLs, tail lights) can fail. This would typically require replacing the entire assembly, which can be more costly than a simple bulb replacement.
• Flickering LEDs (aftermarket): If you install aftermarket LED bulbs without proper load resistors or CANBUS decoders, you might experience flickering or intermittent operation due to the vehicle's electrical system not recognizing the low power draw.
• Wiring Harness Issues: Although uncommon, any electrical issues with the wiring harness connected to the lighting components could lead to malfunctions. This would require professional diagnosis.
• Software Glitches: In very rare cases, software glitches within the vehicle's body control module could affect lighting operation, though this is usually addressed with software updates.

Find a trusted shop on Repairius.