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Eldave...yes there is a delay to turn on/off for tunnels and in cases where there are bright lights. I believe the delay for turning off the lights is longer than for turning on the lights (safety).

thedieter...yes, the headlamps are auto. The sensor signals the ambient light to the BCM, when the ambient light goes below a set level, the BCM activates the light, if it goes above a set level, it turns off the lights.

deserth3...unplugging the sensor MIGHT, set a code. The BCM monitors this sensor and no input at all might cause it to set a code to signal the sensor is dead. (I would have to look it up to verify.)