Parts for your 2002 Toyota Bb-Interior bulbs

2002 Toyota bB interior bulbs — what they do and how to look after them

Interior bulbs are absolutely fitted to the 2002 Toyota bB. Technical sources including the Toyota bB Owner’s Manual for NCP30/NCP31 (2000–2005), the Toyota Electronic Parts Catalogue, and platform-equivalent Electrical Wiring Diagrams (also used on the first‑gen Scion xB) list and illustrate the room (dome) lamp, map lamps, and luggage/boot lamp circuits and bulbs. So, yes — this model definitely uses interior bulbs.

Inside the bB, these little globes handle cabin visibility at night, help find the seatbelt clip or a dropped phone, and make loading the boot less of a guessing game. They also tie into the courtesy light circuit (fade/delay), so doors opening and locking feel a bit more premium even on an older hatch.

Common fitments on the 2002 bB (trim-dependent) typically include:

• Room/dome lamp: festoon style, commonly 31 mm, approx. 8 W
• Map/reading lamps: T10/W5W wedge, 5 W
• Luggage/boot lamp: T10/W5W wedge, 5 W
• Vanity mirror lamp (if fitted): T10/W5W wedge, 5 W

For servicing, it’s smart to check interior lighting at each regular service or WOF/reg inspection. Replacing is straightforward: switch the lights off, use a plastic trim tool to ease the lens down, and swap like-for-like wattage to avoid heat damage to the lens and housing. If upgrading to LEDs, choose warm white (around 3000–4000 K) for a factory look, confirm the LED matches the base type (festoon or T10), and note polarity — if an LED doesn’t light, flip it 180 degrees. Some LEDs can faintly glow with the courtesy fade, using non‑polarised or CAN‑friendly types, or adding a small load resistor, usually sorts it.

If an interior light won’t work, check the bulb first, then the DOME fuse (often 7.5 A in the under‑dash fuse box). A cabin lamp staying on is usually a door-ajar switch (including the tailgate) or the dome/map switch left in the ON position. Keeping lenses clean and contacts free of corrosion helps brightness and reliability.

Because trims vary across markets and options, the safest approach is to confirm bulb spec from the Owner’s Manual, the existing bulb markings, or a reputable parts catalogue before purchasing.

Popular questions about 2002 Toyota bB interior bulbs

What bulb sizes are used inside a 2002 Toyota bB?
Most 2002 bB models use a 31 mm festoon (about 8 W) for the dome, and T10/W5W (5 W) for the map and boot lamps. Some grades add a T10 vanity bulb. Always check the existing bulb or the Owner’s Manual to be sure, as trim levels can differ.

Why do the bB’s interior lights stay on or not turn off?
Common causes are a door or tailgate switch not closing properly, the dome switch set to ON rather than DOOR, or a sticky map lamp switch. If all switches are fine, inspect the DOME fuse and the lamp holder contacts. Water ingress in the tailgate switch can also keep the courtesy circuit alive.

Can LEDs be used instead of the original bulbs?
Yes, quality LED replacements in 31 mm festoon and T10/W5W work well and run cooler. Choose warm white for a factory vibe, ensure correct polarity, and test before refitting the lens. If there’s a faint glow after switch-off (courtesy fade), select non‑polarised/CAN-friendly LEDs or add a small load resistor.