How to Reset the Check Light in a BMW

1. Create a grounding apparatus for the diagnostic connector. Attach the copper clip to the large end of the insulator. Connect the copper wire to the skinny part of the insulator. Connect the other end of the wire to a banana plug. Connect the wire on the BMW pin to the other side of the banana plug.
2. Turn the key in the ignition half way so that the lights come on but the engine is not running.
3. Open the hood and locate the ground plug in the electrical system near the engine. It is usually a small octagon shaped screw or nut close to the data link connector. Attach the open side of the copper clip to the ground plug.
4. Locate the data link connector and unscrew the cap exposing the pins underneath. Press the end of the male pin into the number 7 plug inside the data link connector. This is usually the middle right hole on a 15-point connector and the very bottom hole on a 20-point connector. Hold the pin in place for three seconds to reset the oil light, and nine seconds to reset the inspection light.
5. Remove the pin once the light resets. Screw the cap back on. Turn the engine off, then turn it back on. If the lights are still there, try resetting the lights again. Once the lights remain off, turn off the engine and close the hood.