Parts for your 2012 Subaru Impreza-Interior bulbs

2012 Subaru Impreza interior bulbs — what they do and how to look after them

Interior bulbs are absolutely fitted to the 2012 Subaru Impreza. This is confirmed by Subaru’s 2012 Impreza Owner’s Manual (Lighting section), the Subaru Service Manual (Body & Electrical – Interior Lighting), and the Subaru parts catalogue, which list dome, map/reading, vanity mirror, glovebox, and luggage/boot lamps. These sources specify common small-wattage incandescent types used from factory, typically T10/W5W wedge bulbs for map, glovebox and boot, and a 31 mm festoon (DE3175 style) for the centre dome. Some trims may vary, so checking the build plate and manual is always wise.

On the road, these little globes make a big difference to everyday usability. They light the cabin when hopping in after dark, help find items in the boot, and make reading maps or checking a phone cable less of a fumble. As they age, incandescent filaments darken and output drops, so including an interior bulb check during regular servicing keeps the Impreza feeling fresh and practical.

Replacement is straightforward if done with care:

• Switch the light to OFF and ideally disconnect the negative battery terminal to avoid shorts.
• Use a plastic trim tool to gently pop the lens, don’t lever with a screwdriver on painted or soft trim.
• For wedge (T10/W5W) bulbs, pull straight out, for festoon (around 31 mm), spring the clips, then lift the bulb away.
• Avoid touching incandescent glass with bare fingers, oils can shorten life. If upgrading to LEDs, mind polarity — flip the bulb if it doesn’t light.
• Before refitting the lens, test the light. Check the door-activated dome function still works.

Many owners in Australia and New Zealand opt for warm-white LEDs to reduce heat, draw less current, and sharpen cabin colour. Choose CANBUS-friendly interior LEDs only if specified, and match sizes to the manual. If a new bulb doesn’t work, check the relevant fuse in the interior fuse panel, ensure the dome switch isn’t set to OFF, and confirm the door pin switches are operating.

As part of routine servicing, a quick once-over of all interior lights — map, dome, vanity, glovebox and boot — keeps the Impreza safe and hassle-free after dark. It’s a small job that lifts day-to-day convenience, and it’s well within DIY territory with a steady hand and a proper trim tool.

Popular questions about 2012 Subaru Impreza interior bulbs

What interior bulb sizes fit the 2012 Impreza?
Most cars of this model year use T10/W5W wedge bulbs for the front map, glovebox and boot, and a 31 mm festoon for the centre dome. Vanity mirrors may be wedge or small festoon depending on trim. Always verify against the 2012 Owner’s Manual or the bulb markings on removal.

Can the interior bulbs be upgraded to LED?
Yes. Quality warm-white LEDs are a popular upgrade in AU/NZ, offering brighter light and lower current draw. Match the base type (T10 or 31 mm festoon), check polarity, and avoid ultra-blue styles if you want factory-looking colour. LEDs run cooler, but still ensure the lens fits without pressure.

Why doesn’t my new interior bulb work?
If it’s an LED, flip it 180 degrees to correct polarity. Confirm the switch position (DOOR/ON/OFF), check the relevant fuse, and ensure the bulb is fully seated. If the dome doesn’t come on with doors, inspect the door courtesy switches and wiring as noted in the Subaru Service Manual.