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Toyota Tacoma Dome Light Bulb Replacement Guide
How to change a burnt out overhead dome light bulb in a 3rd generation 2016 to 2021 Toyota Tacoma truck.

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2020 Tacoma TRD Sport
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Dome Light Bulb Housing
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2 Notches - Front Edge
This automotive maintenance tutorial was specifically written to assist owners of the third generation (2016, 2017, 2018, 2019, 2020, 2021 and probably also the 2022 and 2023 model years) Toyota Tacoma truck in changing a burnt out dome light bulb in the overhead housing attached to the headliner above the rear passenger seats (or upgrading the bulb to a brighter LED unit).

Owners of other Toyota or Lexus vehicles such as the Tundra, 4Runner, Hilux, Highlander, C-HR, Avalon, Camry, Corolla, Supra, Land Cruiser, Prius, RAV4, Mirai, Sequoia, Sienna, Yaris, CT 200h, ES 300h, RX 350, GX 460, LX 570, NX 300, RX 450h, UX 200 and UX 250h may also find these DIY instructions to be helpful.

The compatible replacement festoon style light bulb part number is DE3175 which is available from various manufacturers such as Sylvania, Philips, Bosch, PIAA and Eiko.

If you would like to have a brighter dome light that will also last much longer before burning out, install a DE3175 LED unit.

The only tool needed to access and replace the light bulb is a small flat head screwdriver such as from a jeweler's screwdriver set or a plastic pry bar tool.

The first step is to sit in the back passenger seats.

Locate the two small notches on the front edge of the translucent plastic lens cover near the "Door / On" switch.



 

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Insert Screwdriver
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Pry Out Lens Cover
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Remove Tabs - Rear Edge
To prevent from scratching the plastic surfaces, you can either cover the tip of your screwdriver with a thin micro fiber cloth or instead use a plastic trim panel removal tool.

Carefully insert the blade of the screwdriver into one of the two notches on the front edge of the lens cover.

Gently pry out the lens cover.

You may need to re-insert the screwdriver into the other notch on the opposite side of the switch to fully remove the lens cover.

Try to avoid using excessive force. The lens cover should pop out relatively easily.

Do NOT pry at the rear edge of the lens cover. There are two plastic tabs on that side that could break.

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Lens Cover Removed
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Old Light Bulb Exposed
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Pull Back Metal Contact
Set the lens cover aside in a safe place.

If the old light bulb was recently turned on, be careful when you remove it. The bulb might still be hot enough to burn your fingers.

Gently pull back the flexible metal electrical contact on the left (driver) side of the bulb socket.

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Remove Old Light Bulb
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Empty Bulb Socket
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OEM Festoon Light Bulb
Pull the old light bulb straight out of the socket.

The OEM (original equipment manufacturer) light bulb was marked as part number Toshiba 12V8WAL 98.

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Insert New Light Bulb
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New Light Bulb Installed
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Test New Light Bulb
Insert a new festoon style number DE3175 light bulb straight into the socket.

If you would like to have a brighter dome light, install a compatible replacement DE3175 LED bulb.

To test the new light bulb, slide the switch to the "On" position.

Tip - If you installed an LED bulb and it doesn't work, try pulling it out of the socket, rotate it 180 degrees and push it back into the socket. Some LED bulbs are polarized and will only work when the "+" positive and "-" negative electrical contacts are in the correct orientation.

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Two Tabs - Rear Edge
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Insert Rear Edge
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Pop In Clips Front
Line up the lens cover with the light housing.

First, re-insert the two tabs on the rear edge into the housing.

Then gently snap in the retaining clips on the front edge.

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Lens Cover Secured
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Set Switch To "Door"
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Bulb Change Complete!
Make sure the lens cover is securely attached with every edge flush with the light housing.

Slide the switch to the "Door" position so that the dome light will illuminate every time you open the driver or passenger doors.

Be sure to write down the bulb change in your truck's service records.

Please check out all of the 2016-2021 Toyota Tacoma DIY Repair & Maintenance Guides.
 

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