Head light wiper does not work

First check fuses, then check to make sure the bulbs are all good. Next look for loose wires going into the connectors. It is odd that all of the light do not work, but it would depend on how they are wired. The strange part is that headlights and tail lights are not connected to each other.

check battery, does engine start.
do the head lights work keys in pocket?
battery voltage is 12.6v, rested, is it? key off.? all things off.

wiper run key off? or on?
park lock out, is a whole other matter.
1st is battery , always. 1st, (they can discharge)

It sounds to me as though both of the wipers have slipped. The operation of the wipers sounds fine except they do not park in the correct location. To fix this, start the wipers and then turn them off to ensure they think they are in the parked location. At the base of each wiper there is a small cover that can be easily removed with a small screwdriver. Underneath each cover you will see a nut. Loosen the nut somewhat and reposition each windshield wiper to the proper park location. Once done, tighten the nuts securely but do not over tighten, then reinstall the caps. Cycle your wipers on and off a few times to ensure the wipers park correctly. I have owned a lot of vehicles and ALL of my GM vehicles have had this problem.

Hello and welcome to FixYa!
As a first course of action, I strongly suggest that you remove the positive battery connector and let it sit for atleast 5mins. or more before reconnecting it. This will reset the system and can get your vehicle back to it's normal operation.
Hope this helps and thank you for using FixYa! Have a good one!

Remove the wiper arms from the drive posts. Turn on your wipers with the engine running and shut the wipers off -- this will put the wiper drive posts in the park position.

Reinstall the wiper arms so the blades are about an inch above the bottom of the windshield.

Charlie

take it back loose and move it 180 degrees

If the wipers end up in the vertical position and they are the HIDE type usually its the park mechanism mounted on top of the wiper motor that the linkage attaches to, there is a small spring loaded lever on the bottom of this device that wears out and fails to activate the PARK position proccess when the wipers are turned off. When the wipers turn off the motor reverses and the lever is meant to catch on a tab and compress the mechanism pulling the wipers to the park position. Only thing I know what to do is replace this mechanism, ($150. new 25. used)

This is a common problem with Chevy Venture, Olds Silhouette, and  Pontiac Montana. The mechanical wiper drive and parking cam assembly, if it's not broken, needs adjustment. The spring loaded stop arm should engage the vertical tab on the assembly mounting plate when the wiper motor reverses. See pic. 
I will upload the instructions to fix this problem, if there is interest.

Court, With the wiper switch off and the ignition switch in the "run" position, disconnect the wiring connector at the wiper motor. With a multimeter or test light, verify you have 12 volts on the yellow wire. Then check to make sure you have a good ground on the black wire.
If both of those check OK, the wiper motor has a logic board under the cover of the wiper motor, it is most likely bad.
Good luck, let me know.
Regards,

The body control module, BCM is responsible for the function of all of these, and if it has lost communication, or is not functioning, then none of them will work. Not to be discouraging, but this is not a problem to be tackled without a DRB II, a subscription to DealerConnect, and a Daimler Chrysler Platinum Certified technician.