2017 Toyota Tundra Bulb Sizes: Headlights, Tail Lights & More

If you are driving a 2017 Toyota Tundra, you know it’s a rugged, dependable truck capable of handling just about anything you throw at it. However, keeping the road ahead well-lit is crucial for both safety and performance. As an ASE-certified master technician, I have worked on countless Tundras from this generation, and I often see owners confused by the different lighting configurations Toyota offered depending on the trim level (SR, SR5, Limited, Platinum, 1794 Edition, and TRD Pro).

Whether you are looking to replace a burnt-out tail light or upgrade your halogen headlamps to modern LEDs, having the correct bulb size is the first step. Below is the comprehensive guide and bulb size chart for the 2017 Toyota Tundra.

Quick Reference: 2017 Toyota Tundra Bulb Sizes

Note: Depending on your specific trim package, your Tundra may come equipped with factory LED headlights and fog lights (standard on higher trims like Platinum, 1794 Edition, and TRD Pro). Factory LED assemblies are generally sealed units that do not have replaceable bulbs; the entire housing must be replaced if they fail.

LED vs Halogen Upgrade Considerations

Upgrading the halogen bulbs in your 2017 Tundra to aftermarket LEDs is one of the most popular modifications, but it isn't always as simple as plug-and-play.

1. CANBUS Errors and Hyper-Flashing: The Tundra’s electrical system may not recognize the low current draw of aftermarket LED turn signals. This will cause "hyper-flashing" (the blinker flashes extremely fast). To fix this, you will need to wire in a load resistor for each LED turn signal bulb or install a CANBUS-ready LED bulb with built-in resistors.
2. H4 (9003) Headlight Upgrades: The H4 bulb acts as both the high and low beam. When upgrading to an LED H4, ensure the bulb is properly oriented (usually with the LED chips facing 3 o'clock and 9 o'clock) to replicate the halogen beam pattern. Otherwise, you'll scatter light into oncoming traffic and ruin your visibility.
3. Space Constraints: Some high-output LED headlight bulbs feature large cooling fans or heat sinks. Make sure the dust covers behind your Tundra's headlight assemblies can still be securely fitted to prevent moisture intrusion.

How to Replace Each Bulb

Here are a few quick technician tips for tackling these bulb replacements at home:

• Headlights (Low/High Beam): Open the hood and locate the back of the headlight housing. Disconnect the electrical connector, pull off the rubber dust boot, unclip the metal retaining wire, and pull the H4 bulb straight out. Do not touch the glass of the new halogen bulb with bare fingers!
• Fog Lights: The easiest way to access the fog lights is by turning the steering wheel all the way in one direction, removing the fasteners securing the front fender liner, and peeling the liner back. Unplug the connector and twist the H16 bulb counterclockwise to remove it.
• Front Turn Signal / DRL: Accessible from the engine bay, just below the headlight bulb. Twist the socket counterclockwise and pull the bulb out.
• Tail, Brake, and Rear Turn Signals: Lower the tailgate and remove the two T30 Torx or 10mm bolts securing the tail light assembly. Carefully pull the assembly straight back to pop it off its retaining pins. Twist the appropriate socket to replace the 3157 bulbs.
• Reverse Lights: Also located within the tail light housing. Use the same removal process as the brake lights, and swap out the 921 bulb.
• Interior Map/Dome Lights: Use a plastic trim removal tool (never a metal screwdriver) to gently pry the plastic lenses off. Pull the wedge (194) or festoon (DE3175) bulbs straight out.

Common Lighting Issues for this Generation

The 2017 Tundra is incredibly reliable, but there are a few lighting quirks to watch out for:

• DRL Socket Melting: On trims utilizing halogen DRLs, the continuous heat can sometimes cause the plastic 3157 socket to scorch or melt over time, leading to a loose connection. Inspect the socket if your DRLs are flickering.
• Moisture in the Headlight Housings: If the rubber dust boots aren't reinstalled perfectly flush after a bulb change, condensation can build up inside the large Tundra headlight housings.
• Factory LED Failure: If your truck has the premium OEM LED headlights or fog lights and they fail, they cannot be fixed with a $20 bulb. You will need to replace the entire housing, which can be quite expensive.

Tackling bulb replacements on your Tundra is a highly rewarding DIY task, but if you run into electrical gremlins or need a professional aiming of your new LED headlights, do not hesitate to reach out to an expert. Find a trusted shop on Repairius.