Toyota Tundra: Why Won't My Interior Lights Turn On/Off?

Is your interior light not turning on or off when you want it to in the Toyota Tundra? Read on to learn how to diagnose it.

By Bassem Girgis - January 20, 2016

This article applies to the Toyota Tundra (2000-Present).

The interior lights in your Toyota Tundra have three settings: the first one allows the lights to go on when you open the door, the second one allows them to go on when you turn them on manually, and the third one shuts them off. If you know your setting is set to something other than the "off" setting, then you may have an issue. There are a few things that can go wrong and cause your interior lights to act up as such. This guide will show you how to go about diagnosing the interior lights in your Toyota Tundra.

Toyota Tundra Why Won't Interior Lights Turn On/Off

Materials Needed

  • Flat head screwdriver
  • Replacement fuses
  • Replacement bulbs
  • Voltmeter

Step 1 – Check fuses

They could be blown.

The most common reason the interior lights is acting up is a blown fuse. The fuse box is located under the dashboard, by the driver's side. On the cover of the fuse box you will find a diagram, which will guide you to which fuse is responsible for the interior light. Remove the fuse and inspect it to see if it's blown. If it's blown, it should have a broken line inside of it, or it would look darker than the rest. Replacing the blown fuse would solve your problem.

Toyota Tundra interior fuse box
Figure 1. Interior fuse box.

If the fuse is working properly, proceed to Step 2.

Step 2 – Check dome light bulb

It could be burnt.

The other obvious cause for a non-working light is a bad light bulb. This issue is considered an easy fix. You will need to purchase a new bulb, which should cost very little, then you just need to do a quick swap between the old bulb and the new one. Pop the cover off the dome light gently using your flat head screwdriver. Then inspect the bulb. If it's burnt, replace it, and that should fix the issue.

Toyota Tundra interior bulb
Figure 2. Check interior bulb.

If the bulb isn't burnt, proceed to Step 3.

Step 3 – Check dome light's current

You could have an electrical shortage.

Using your voltmeter, insert the probes in the connectors where the bulb connects. Make sure your dome light is turned on. You should be reading 12 volts. If you're not getting any reading, then you have a shortage and you're not getting any current to the dome light. At this point, consulting a professional might be a good idea, unless you're an electrical wizard.

Figure 3. Voltmeter.

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