2003 Honda Civic Light Bulbs Types:
| Bulb | Type |
| Headlights (HI/LO) | 12V 60/55W (HB2) |
| Front turn signal/side marker lights | 12V 21/5W |
| Front parking light | 12V 3CP |
| Rear turn signal lights | 12V 21W |
| Stop/Taillights/Rear side marker lights | 12V 21/5W |
| Back-up lights | 12V 21W |
| Taillights | 12V 3CP |
| High-mount brake light | 12V 21W |
| License plate lights | 12V 3CP |
| Ceiling light | 12V 8W |
| Front ceiling light (US: EX model, Canada: SPORT model) | 12V 5W |
| Spotlights |
12V 5W (US: EX model, Canada: SPORT model) 12V 8W (LX model) |
| Trunk light | 12V 5W |
