Headlight switch seems to have a problem. The headlights do not turn on in the AUTO position (even when very dark. Other exterior lights are functioning). The headlights turn on when the switch is in POSITION 1 (this position should turn the headlights off). The headlights are off when the switch is in POSITION 2 (they should be on).

This is the delay feature of your vehicle.
Your car's Auto Headlight functionality offers both convenience and safety. The exit delay programmed in means that the lights will stay on after you turn off the engine for a set period of time. You can change how long they stay on to fit your needs. Here's how to do that:

1. Make sure the headlight switch is in the Auto position.
2. Make sure the key is set to OFF.
3. Turn the headlight switch off.
4. Turn the switch back to ON, then OFF again.
5. Turn the switch back to the Auto position.
6. Make sure the lights come on.
7. Wait for the amount of time you want the headlights to stay on, then turn the switch back to OFF once more.
8. The headlight delay should now be programmed.

Tips

• The maximum delay you can set is three minutes.
• You can set the system to have no delay by not waiting to turn the switch back to OFF the final time.

What lights ? Exterior - interior or all lights ? Could be the light switch , dimmer switch , daytime running lamps module . To find out for sure would need to test the electrical circuits , Can you do that ? There are videos on you tube on basic electrical trouble shooting , how to read a wiring diagram , how to use a DVOM - digital volt ohm meter .

More than likely a bad headlight switch. check the fuses first, spray some WD40 into the switch second, and third; replace the headlight switch.

It's probably the lighting control module , but without doing some electrical testing that is just a guess !
Battery positive voltage (B+) is applied at all times to the lamp control module (LCM) through the underhood junction block HDLP MaxiFuse® and CKT 1242 (RED).
When you place the headlamp switch in the HEAD position, the headlamps input to the LCM is grounded. The LCM then applies battery positive voltage (B+) through the underhood junction block HDLOBML fuse and HDLOBMR fuse, which feed the left low beam headlamp and the right low beam headlamp respectively. When you activate the headlamp dimmer switch by pulling on the multifunction lever until the switch clicks, CKT 524 (PPL) is grounded to the LCM. The LCM then removes battery positive voltage (B+) from the low beam headlamps and supplies battery positive voltage (B+) through the underhood junction block HDHIBML fuse and HDHIBMR fuse, which feed the left high beam headlamp and the right high beam headlamp respectively.

Twilight Sentinel Circuit Description
Twilight sentinel determines whether the daytime running lamps (DRL), or the exterior lamps and the low beam headlamps at full intensity should be on based upon the signal of the ambient light sensor. When the ambient light sensor detects daytime, the twilight sentinel turns on the DRL. When the ambient light sensor detects darkness, the twilight sentinel turns on the exterior lamps and the low beam headlamps at full intensity. The twilight sentinel also keeps the lamps on for a delay period of 3 to 180 seconds under the following conditions:
• The vehicle is in PARK.
• The ambient light sensor detects darkness.
• The ignition switch is turned to the OFF position.
You may turn off the twilight sentinel manually. When it is dark and the gear selector is in PARK, pushing the twilight sentinel switch to OFF will turn off the headlamps and exterior lamps. Pushing the twilight sentinel switch to OFF again will turn on the headlamps and the exterior lamps. If the gear selector is not in PARK, pushing the twilight sentinel switch will have no effect.
The F- switch is just an input from the LCM - lamp control module .
Do you know how to test control module inputs an outputs ? Very easy to fry a module if you don't know how to do it .
Also have a full scan of all modules on the vehicle , could have DTC'S - diagnostic trouble codes stored . Not for the OBD 2 engine computer . The instrument cluster , BCM , LCM can all set codes too, related to lighting an someother thing's .
ECM Inputs and Outputs Diagnosis

Electric Testing Techniques You Need to Know

You can find free wiring diagrams here http://www.bbbind.com/free_tsb.html Enter vehicle info. year , make , model and engine ! Under system click on lighting ,then under subsystem click headlamps . Click the search button then the blue link . The first diagram you will see at the top the power supply to the LCM , down a little you will see the headlamp switch , ambient light sensor . Now if you want to start replacing thing's without testing good luck !

With the switch in sidelight or dip

position, pull the switch to its first

position to turn on the front fog lights.

Pushing the switch in or turning it to OFF
or AUTO will turn off the front fog lights (this is for the front)

With the switch in any position except

OFF or AUTO, pull the switch to its

second position to turn on the rear fog

lights. This will also turn on the front fog

lights unless main beam is selected.

Pushing the switch in or turning it to OFF
or AUTO will turn off the rear fog lights (this is for the rear)

Exterior lighting

Exterior lighting switch

A. OFF.

B. Side (parking) lights.

C. Headlights.

D. Auto.

E. Front fog lights.
F. Rear fog lights.

It is the round knob nest to the steering colume

In the AUTO mode, the lights should only work when its dark. in the day light, the only lights that work are the DRL (daytime running lights) (Headlights) All the lights should work when turned on MANUAL, EVERYTIME. You may have a bad connection, but it needs to be checked on MANUAL when the problem is present.

Turn the headlight switch to the off position (not auto) and depress the overhead light button, located just below the cargo light switch, several times ( 3-5 times) until you hear a bell then the headlight switch actually works as indications show around the knob.

the first thing to check is the headlight switch, they will go bad and keep lights on,also i dont know how long youve own this truck but theres and auto setting on switch and the lights come on even with the swith off at dusk,and also there are driving lights that are on all the time,if you turn key off and they stay on for more than 2 mins, then check the switch,if you mean there on every time you start it ,even during the day, then the sensor on the dash may be bad or you may have something cover it and it thinks its dark out and turning on the lights.

Start by setting your auto headlight switch to off if this solves it replace your headlight switch If your car is equipped with daytime running lights there could be a short bridging them with your auto head lights look for broken or frayed wires do this also if you have installed or had someone install an aftermarket stereo or speakers/sub woofer, amplifier. Good Luck with this

Hello, firstly I was wondering if the lights shut off when you pull the switch off the harness?
If YES, then THAT switch or wiring could be bad
if NO, then it's most likely the body control module