Symptoms
- Dome or interior lights stay on with all doors closed
- Battery dies from lights left on overnight
- One specific door seems to trigger the issue
- Lights dim slowly over time rather than staying full brightness
Likely causes
- CommonDoor not fully latchedA door that looks closed but isn't fully latched can keep the interior light circuit active.
- CommonManual light switch set to always-onMost interior lights have a manual on/off/door setting that can be accidentally left on.
- CommonStuck or faulty door jamb switchThe switch that detects the door position can get stuck in the 'open' state.
- PossibleTrunk or hatch not fully closedSome interior lights are also tied to the trunk or hatch switch.
What to do
- Check the manual switch setting on the interior light itself, and set it to the door-activated position rather than always-on.
- Firmly open and close each door to check if one isn't latching properly.
- Check the trunk or hatch too, since it can sometimes be linked to the interior light circuit.
- Inspect each door's jamb switch (the small button on the door frame) for dirt, damage, or sticking.
- Try pressing each door switch by hand with the door open to see if the light responds correctly.
- Clean or lightly lubricate a sticking door switch if that's identified as the cause.
- If the battery has already died from this issue, jump-start or charge it before continuing troubleshooting.
- Have a shop replace a faulty door jamb switch if manual checks don't resolve the issue.
Tools and parts
- Flashlight
Door jamb switchSearch: “door jamb switch for [your car make model year]”
When to call a pro
If a battery has died repeatedly from this, get the faulty door switch fixed quickly to avoid ongoing battery drain.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.