Wipers stop in middle of windshield when turned off - Century 2002 tried nothing thus far

Sorry , no adjustment .
Wiper/Washer System Components
The Wiper / Washer System consists of the following components:
• Windshield wiper / washer switch
• Windshield wiper system module / motor
• Windshield washer fluid pump
• Windshield washer fluid level switch
• WPR 25A fuse
Wiper / Washer System Operation
The windshield wiper motor module is part of the windshield wiper motor cover and controls the wiper motor operation. The windshield wiper motor is a 2 speed motor. Windshield wiper DELAY operation is a low speed wiper motor function with a variable delay interval between the wipe cycles. The DELAY interval is controlled through a series of resistors within the wiper / washer switch.
Park Position Operation
When the windshield wiper / washer switch is turned to the OFF position while the wiper motor is somewhere in mid-cycle, the wiper motor module will continue to operate the wiper motor until the wipers reach the park position. If the ignition is turned off while the wipers are in mid-cycle, the wipers will stop immediately where they are. The wipers will park the next time the ignition is cycled to the ON position.

Do you know how to do diagnostic's ?

Wipers Blades Do Not Park
Step
Action
Yes
No
Schematic Reference: Wiper/Washer Schematics
Connector End View Reference: Wiper/Washer Connector End Views
DEFINITION: This table diagnoses the wipers operate normally but will not return to the park position when the wiper operation is cancelled.
1
Did you perform the Diagnostic System Check - Vehicle?
YES - Go to Step 2
NO - Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
2
Turn ON the ignition, with the engine OFF.
Move the wiper switch to the LO position.
Move the wiper switch to the OFF position.
Do the front wipers advance to the park position?
YES - Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
NO - Go to Step 3
3
Turn the ignition switch to the RUN position.
Turn the wiper switch to OFF.
Disconnect the wiper/washer switch connector.
Do the wipers park?
YES - Go to Step 7
NO - Go to Step 4
4
At the wiper/washer switch connector, measure the voltage of the windshield wiper switch signal 2 circuit.
Does the voltage measure greater than 1.0 volts?
YES - Go to Step 5
NO - Go to Step 8
5
Reconnect the wiper/washer switch connector.
Disconnect the wiper motor connector.
Measure the voltage of the windshield wiper switch signal 2 circuit.
Does the voltage measure greater than 1.0 volts?
YES - Go to Step 6
NO - Go to Step 8
6
Repair a short to battery positive voltage in the windshield wiper switch signal 2 circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
YES - Did you find and correct the condition?
NO - Go to Step 9
--
7
Replace the wiper/washer switch. Refer to Turn Signal Multifunction Switch Replacement in Steering Wheel and Column - Tilt.
YES - Did you complete the replacement?
NO - Go to Step 9
--
8
Replace the wiper motor cover. Refer to Wiper Motor Cover Replacement .
YES - Did you complete the replacement?
NO - Go to Step 9
--
9
Operate the system in order to verify the repair.
Did you correct the condition?
System OK
Go to Step 2

replace the wiper motor, the park on shut off circuit has gone awry. buy a repair book or look for videos on youtube.com as to removal and replacement.

Im no mechanic but this was an easy fix even for me, lift the hood, unbolt the wipers,pop the black plastic clips(they look like large flat plastic screws) then lift the whole plastic cover out of the way, look down on the drivers side wiper assembly and below that it joins to the motor, on the motor there is a little metal lug that has got bent , when you run the wiper look in and you will see a little spring loaded arm pass by the lug when it goes to the idle poosition, you need to bend the lug back in towards the little arm, not too far or it will sound like it is grinding when the wipers are running.
this lug pusches the wipers back to their home position.

you need a new wiper motor, yours just got out of timing.

ive heard of a windshield wiper relay going bad causing this problem....maybe check into it

The problem is a broken part in the module which is inside the wiper motor. As far as I know, the part is not available, and you must replace the entire wiper motor to repair the problem

The wiper switch is defective.

Well pop the two little black plastic top hats off of the wiper arm mounts and losen the nuts. Turn your wipers off and tighten them in the lower position.There should be visible mark on the widshield where the wipers have spent most of there time sitting.If you have them to low when you turn them on you will be able to tell by how high the go up on the windshield.Well hope this helped.

check to make sure the wipers are at its right angle on the vehicle, loose the nuts and place both wipers close to the bottom of the wind screen

It sounds like the the circuit board has gone bad and does not know where the base is any more so it will stop at the middle or the windshield. Auto Zone should have a new board if it's replaceable like the GM products. Good luck and hope this helps, In the mean time you can always turn your wipers on and pull the fuse out when it's at the down position so it's not up.