Parts for your 2020 Subaru Impreza-Interior bulbs

2020 Subaru Impreza interior bulbs — what they do and how to look after them

Interior bulbs are absolutely fitted to the 2020 Subaru Impreza. Technical references including the 2020 Subaru Impreza Owner’s Manual (interior lighting/replacement section), Subaru Genuine Parts catalogues for the GK/GT series, and major bulb guides (e.g., Sylvania/Philips fitment listings) confirm the car uses serviceable interior lamps such as map/reading lights, a dome light, cargo/boot and licence plate lights. Many positions use common T10/168 wedge or 31 mm festoon bulbs, on some trims, certain lamps may be LED modules, which Subaru advises be replaced as an assembly if they fail.

Those interior bulbs do the everyday jobs: lighting up the cabin for finding keys, making sure seatbelts click in after dark, and giving the boot a proper glow so gear’s not lost in the shadows. They also help with safety and convenience when doors open, and make the cabin feel a bit more upmarket when upgraded to quality LEDs.

• Typical fitment: front map/reading lights, centre dome light, vanity mirror lights, glovebox and boot/cargo light.
• Common bulb styles: T10/168/194 wedge and 31 mm festoon (DE3175) for many variants, some trims feature factory LED modules.

Good servicing habits keep them sweet. During routine services or DIY checks, make sure each light switches on reliably in door and manual modes. If a bulb’s dim, pinkish, or flickering, it’s on the way out. For incandescent types, avoid touching the glass with bare fingers — skin oils shorten life. If upgrading to LEDs, choose CANbus-friendly types to prevent flicker or bulb-out warnings, and match the beam pattern so light spreads nicely rather than creating hotspots.

1. Switch the ignition and interior light switch off, and let hot bulbs cool.
2. Use a plastic trim tool to ease lenses down to avoid scuffing the headliner.
3. Swap like-for-like wattage/size, for LEDs, mind polarity — if it doesn’t light, flip it.
4. Test door and manual functions before refitting lenses.
5. If a lamp position is an LED module (as noted in the Owner’s Manual), replacement may require the complete assembly — best handled by a Subaru technician.

If several interior lights fail at once, check the appropriate cabin fuse (often labelled ROOM/INTERIOR in the passenger fuse box). Water ingress or sticky switches can also cause odd behaviour, clean contacts gently and replace worn switches as needed.

What interior bulb sizes fit a 2020 Subaru Impreza?

Most variants use T10/168 wedge bulbs for map/reading and cargo areas, and a 31 mm festoon (DE3175) for the dome. Some trims use LED modules in one or more positions. Always confirm against the Owner’s Manual and the build/trim label, or compare the removed bulb before buying replacements.

Can they upgrade the Impreza’s interior lights to LED?

Yes, quality LED replacements give a whiter, brighter cabin and draw less current. Choose CANbus-compatible LEDs with appropriate beam spread, and keep colour temperature around 4000–6000 K for a clean look. If the car has factory LED modules in any position, those are typically replaced as an assembly rather than a simple bulb swap.

Why do the interior lights flicker or stay on?

Common culprits are a failing bulb, a mis-seated LED (polarity/fitment), a sticky door-ajar switch, or a blown/loose fuse. If multiple lights misbehave together, start at the fuse and the main interior light switch position. For factory LED modules that flicker, the fix is usually replacing the lamp unit.