Parts for your 2004 Subaru Impreza-Interior bulbs

2004 Subaru Impreza interior bulbs: what they do and how to look after them

Interior bulbs are absolutely fitted to the 2004 Subaru Impreza. Subaru’s MY2004 Impreza Owner’s Manual and Body Electrical section of the service manual specify interior lighting for the dome/room lamp, front map/reading lamps, luggage/boot lamp and (on some trims) glove box and vanity mirror lamps. Industry bulb guides from major lamp makers also list sizes for these positions on the GD/GG Impreza platform, confirming that interior-bulbs are relevant and used on this model.

These little globes do more than make the cabin look tidy — they help the driver and passengers find seatbelts at night, read a map, and sort gear in the boot without fumbling about with a torch. On the 2004 Impreza, the front map lamps are typically T10 W5W (a 194-capless wedge), the centre dome/room lamp is usually a 31 mm festoon (often noted as DE3175/3175/6418), and the boot/cargo lamp is commonly a T10 W5W on sedans or a 31 mm festoon on wagons. Trim and market can vary slightly, so it’s smart to confirm against the Owner’s Manual or the lamp base markings before buying replacements.

Replacement and maintenance are straightforward and well within DIY territory. Keep these tips in mind during regular servicing or whenever a light goes dim:

• Switch the lamp to OFF and remove the key, allowing the bulb to cool avoids burnt fingers.
• Use a plastic trim tool to ease off the lens, metal screwdrivers can mar the lens or crack tabs.
• Map lights (T10): gently pull the wedge bulb straight out. Dome/cargo festoon: release from the spring clips.
• Avoid touching glass with bare fingers, skin oils can create hot spots and shorten life.
• If several interior lights are out, check the “ROOM”/interior light fuse in the cabin fuse box before blaming the bulbs.
• Replacing in pairs isn’t essential, but it keeps colour and brightness matched.
• LED upgrades are fine for interior use: choose non-polarity or flip the bulb if it doesn’t light, and pick a warm-white (around 3000–4000 K) for OEM-like colour. Ensure the lamp fits under the lens without fouling.
• After refitting, set the dome switch to DOOR so lights go out automatically and don’t drain the battery.

If disconnecting the battery negative for peace of mind, note any radio security code and presets. A quick check during each service — lenses clean, bulbs bright, switches working — keeps the cabin friendly and the 2004-subaru-impreza interior-bulbs doing their job.

Popular questions about 2004 Subaru Impreza interior-bulbs

What bulb sizes fit the 2004 Subaru Impreza’s interior lights?

Most 2004 Impreza sedans use T10 W5W (also known as 194) for the front map/reading lamps and boot lamp, and a 31 mm festoon (DE3175/3175/6418) for the centre dome. Wagons often have a festoon in the cargo area as well. Variations exist by trim and market, so a quick look at the old bulb or the Owner’s Manual is the safest bet.

Can the 2004 Impreza’s interior bulbs be replaced with LEDs?

Yes. LEDs run cooler, draw less power and last longer. Choose quality lamps sized correctly for the housing, and opt for warm-white if an OEM look is preferred. If an LED doesn’t light, rotate it 180 degrees or pick a non-polarity type. Interior LEDs generally won’t trigger warnings on this model.

My dome light isn’t working — is it the bulb or a fuse?

Start with the simple checks: is the dome switch set to DOOR or ON, and does the bulb look dark or broken? Try a known-good bulb first. If still dead, inspect the ROOM/interior light fuse in the cabin fuse panel. If the fuse is fine, look at the door switches or the lamp’s contacts for corrosion or a loose fit.