Jeep Liberty Back Up Light Bulb Size

Additional Notes

• The Jeep Liberty uses the 3157 bulb for the back up light across all listed model years, spanning 2002-2012.
• The 3157 is an ANSI-standardized bulb type, meaning its specifications are governed by a recognized North American standard used in both the United States and Canada.
• This bulb follows the T25 wedge form factor, which refers to its tapered plastic base that presses directly into a socket without requiring a separate metal base or bayonet pins.
• The 3157 is a dual-filament bulb, meaning it contains two separate filaments within a single glass envelope, each operating at a different wattage.
• The two filaments in the 3157 operate at 27W and 7W respectively, with the higher-wattage filament typically serving the brighter function and the lower-wattage filament serving a secondary role such as a running or parking light.
• The bulb operates at 12 volts, which is consistent with the standard electrical system voltage found in conventional passenger vehicles and light trucks.
• Because the 3157 is a dual-filament type, it is not directly interchangeable with single-filament bulbs of similar physical size, such as the 3156, without accounting for the difference in filament count and socket wiring.