2015 Toyota Tundra Bulb Sizes (Headlights, Fog, Tail)

As an ASE-certified master technician, I’ve worked on countless third-generation Toyota Tundras. The 2015 Toyota Tundra is a rugged, reliable workhorse, but its factory lighting—primarily halogen on most trims—leaves a bit to be desired compared to modern standards. Whether you are driving an SR, SR5, Limited, Platinum, or 1794 Edition, knowing your exact bulb sizes is crucial when it’s time for a replacement or a visibility upgrade.

Below is your comprehensive guide to the 2015 Toyota Tundra’s exterior and interior lighting.

Quick Reference: 2015 Toyota Tundra Bulb Sizes

Here is the master list of bulb sizes for the 2015 Tundra. Note that standard trims (SR, SR5) use a dual-beam H4 halogen setup, while higher trims (like the Platinum and 1794 Edition) came equipped with factory LED daytime running lights (DRLs), though the main beam is still largely H4 unless modified or equipped with the later TRD Pro LED housings.

Note: The H4/9003 bulb serves as both the low and high beam in a single bulb housing for standard 2015 Tundra models.

LED vs Halogen Upgrade Considerations

Upgrading your 2015 Tundra from factory halogens to aftermarket LEDs is one of the most popular modifications, but it requires some planning:

• Reflector Housings: The 2015 Tundra uses large reflector housings for the headlights. If you upgrade your H4 bulbs to LED, make sure you choose a bulb designed to mimic the halogen filament's exact placement. Otherwise, you will scatter light, blind oncoming drivers, and actually reduce your down-road visibility.
• CANBUS Systems: Toyota trucks from this era are generally forgiving compared to German vehicles, but installing LED turn signals (3157) will almost certainly cause "hyper-flashing." You will need to wire in a 50W 6-Ohm load resistor across the turn signal wiring or purchase CANBUS-ready LED bulbs with built-in resistors to normalize the blink rate.
• Fog Light Heat: The H16 fog lights run at a very low wattage (19W). Do not install high-wattage halogen replacements here, or you will melt the plastic fog light housing. If upgrading, low-wattage LEDs are the safest route.

How to Replace Each Bulb

Here are a few quick technician tips for changing the bulbs on your 2015 Tundra:

• Headlights (Low/High Beam): Open the hood and locate the back of the headlight assembly. Unplug the 3-prong harness, remove the rubber dust boot, and unclip the metal retaining wire to pull the H4 bulb out. Never touch the glass of the new halogen bulb with bare fingers; the oil from your skin will cause it to shatter.
• Fog Lights: These are easiest to access from underneath the front bumper. You may need to remove a few 10mm bolts holding the fender liner/splash shield in place to reach your hand in. Twist the H16 bulb counterclockwise to remove.
• Tail Lights (Brake, Turn, Reverse): Open the tailgate and remove the two T-30 Torx screws (or 10mm bolts) on the inside lip of the tail light assembly. Pull the housing straight back toward you to pop it off its retention pins. Twist the sockets counterclockwise to access the 3157 and 921 bulbs.
• License Plate Lights: These can be tricky. Use a trim removal tool or a flathead screwdriver wrapped in tape to gently pry the plastic housing out of the bumper to access the 194 bulbs.
• Interior Dome/Map Lights: Carefully pry the plastic lenses off with a plastic trim tool. The map lights pull straight out, while the dome light is a spring-loaded festoon bulb.

Common Lighting Issues for this Generation

The 2015 Tundra is incredibly reliable, but lighting quirks do exist:

1. Moisture in Headlights: Some third-gen Tundras develop condensation inside the headlight assembly. This is usually due to a failed butyl seal around the lens or a cracked rear dust boot.
2. Melted DRL Sockets: Because the DRLs run constantly while driving, the heat from the standard halogen bulbs can sometimes scorch or melt the plastic 4157 socket over time. Replacing these with quality LEDs can prevent this issue by lowering the operating temperature.
3. Hyper-flashing: As mentioned, this is almost always a result of previous owners installing cheap LED turn signal bulbs without load resistors.

If you are dealing with wiring issues, broken housings, or simply want a professional to handle a full TRD Pro LED headlight conversion, don't hesitate to seek professional help. Find a trusted shop on Repairius.