D15 Lighting LED Interior Kit 2-3 Brighter Than Stock Halogen Bulbs Low Power Consumption, Low Temperature, Long-Lasting Life Span No Error Showing on the Dashboard. Shut Off Dim as Stock Bulbs Troubleshooting: flip the bulb 180 degrees or reverse the polarity if the bulbs are not lighting up as LEDs are polarity-sensitive. We will test all bulbs before shipping them out to ensure that we provide the best quality merchandise for our customers. If the bulb is still not functioning properly, please contact us via E-mail(Ask Product Question) first. We are committed to provide 100% customer satisfaction.