Windshield wiper problems

This is a complex wiper system . Here are all the components involved !
The Wiper/Washer System consists of the following components:
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Windshield wiper/washer switch

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Body control module (BCM)

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Wiper 1 relay

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Wiper 2 relay

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Wiper diode

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Windshield wiper motor

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Windshield washer pump

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Windshield washer nozzles

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Windshield washer solvent container

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Windshield wiper arm and blade assemblies

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Windshield wiper transmission

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WIPER/SW 10A fuse

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WIPER 25A fuse

Circuit/System Description
The body control module (BCM) controls the wiper motor based on input from the windshield wiper washer switch. The BCM monitors the wiper washer switch through three separate signal circuits and a ground circuit. The windshield wiper switch high signal circuit is used to determine high speed wiper operation, the windshield wiper switch low signal is used to determine low speed, intermittent, and mist operation through the use of a resistor ladder, and windshield washer switch signal circuit is used to determine washer operation. The windshield wiper motor park operation is controlled by the BCM. The BCM recieves an input from the park switch to determine wiper blade position. When the wiper blades are at the bottom of the windshield glass in park position the wiper park switch will open and the circuit will be pulled up to B+ by the BCM. The park signal will be pulled to ground by the wiper motor park switch while the wiper blades are not in the park position.
The BCM controls the windshield wiper motor through two output controls, controlling two relays which determine the desired wiper speed, high or low
Diagnostic Trouble Codes (DTCs)
The body control module (BCM) monitors the voltage on the windshield wiper switch signal 2 circuit for diagnostic purposes. If the circuit is shorted to voltage while the driver is commanded OFF, the BCM will store DTC B3715. If the circuit is shorted to ground while the driver is commanded ON, the BCM will store DTC B3715. Refer to DTC B3715.
It would be best to have a factory scan tool to diagnose this problem . it would make it easier anyway .
It

Replace the wiper motor. It is under the wiper blades. remove the blade arms, remove the plastic bezel, remove the motor. The motor has the delay and speeds built in it.

MAY BE BAD WIPER RELAY, OR THE DELAY WIPER CIRCUIT OR SWITCH IS BAD.

Assuming you have good wiper blades and have cleaned the windshield (no oil or other contaminants) I'm guessing the arms need to be replaced. The springs are failing to keep proper pressure on the blade allowing them to skip or lift at speeds.

We have the same problem on our 97 Grand Marquis. We have replaced the wiper blades and the drivers wiper arm with a used one. The problem was not completely solved but it did work better. We are going to replace the arm with a new one and see if that works better.

Anytime the windshield wiper blades do not park themselves normally, the windshield wiper motor should be replaced.

If your blades are "skipping" or seem to be "sticking" to the windshield they may simply just need to be replaced. The rubber gets stiff with use and from chemicals and will no longer be pliable enough to slide across the windshield. If you check them and they are cracked or stiff, replace them. The blade cartridge can also have loose or cracked parts caused by weather, usually where it assembles to your wiper arm. Your vehicle can use multiple design types, the easiest to install and remove is the Shepards Hook.
However, if you find nothing wrong with the blades, check the underside of the wiper arm and you will see a spring. Check the tension of the spring with your finger. If it is relatively easy to pull out then it is too worn and won't provide enough pressure on your wiper arm. Replace it.

the wiper arm is bent

It is the seal on your windshield. I had the same problem with mine & the dealership was able to replace the seal pretty quick.

A better quality (aftermarket)blade fixed that problem on my E230