I usually just manually turn mine on when it is raining outside. I live in So Cal though so we do not get as much rain as some other places.

 

I asked my dealer this very question as when it is rainy they don't flip on. I think they need to be a little more sensative. But the Service Guy told me there is no way to adjust the sensitivity of the sensor.

So my question now is, is this true or is the Service guy just feeding me a line?

 

This is true. The old sensors used to have an adjustment on them, but I removed mine, and no adjustment existed. I could not find anywhere in the shop manual to adjust it with a scan tool either.

 

Guess mine are broke. I've had my 2005 Lariat for a couple of months now and the lights have never come on in Auto. Tried following manual on programming them with no luck. Just haven't had time to bring it back just for this. If anyone has any other ideas, would appreciate them.
Found by searching that the red blinking dash led also houses the autolamp sensor; will try covering this to see if it helps/changes anything and post results.

 

is it possible to retrofit with a pre-04 sensor/adjuster?