1. Ensure that the headlight switch is in the OFF position.
2. Locate the twilight sentinel module. In most LeSabres, it's located under the dashboard, to the left of the steering column.
3. Rotate the adjustment knob on the twilight sentinel module to the desired sensitivity setting. Higher numbers indicate a lower light level at which the headlights will automatically turn on.
4. Start the engine and turn the headlight switch to the AUTO position. The headlights will now automatically turn on and off based on the ambient light level.
