For the 2009 Chevrolet TrailBlazer, the supplied fitment data lists a 9005 bulb for the high beam and daytime running light. No low-beam bulb size is provided, so verify the headlamp assembly before ordering a replacement. Fog-light fitment varies by trim: LT models use 880, while SS models use 893.
Other exterior lighting uses several common numbered bulbs. The front turn signal and parking light use 3757A, while the front side marker uses 194NA. Rear turn signals and reverse lights use 3157; the tail and brake lights use 3157R. The center stop lamp is an integrated LED unit.
- License plate lighting: 2825 or 98
- Dome and trunk lighting: 212-2
- Courtesy and glove-box lighting: 194 or 7441
- Vanity lighting: 7065
Check the vehicle trim and existing socket when multiple options are listed.