I know the circuit diagram but how do you

You need a wiring diagram
How to get car wiring diagram Ricks Free Auto Repair Advice

Hard to say , would need to view wiring diagrams an test the electrical circuit's for the vent windows to find the reason why . Do you know what a wiring diagram is an how to use with DVOM - digital volt ohm meter to test the circuit's ? Checking connectors , wiring , switch operation ? Pulling the driver door panel an vent window trim panel to check for B+ voltage at the motor etc.... Free wiring diagrams here http://www.bbbind.com/free-tsb Enter vehicle info. year , make , model an engine . Under system click on body & accessories , then under subsystem click prower windows. Click the search button then the blue link. The first diagram shows the vent windows circuit's .
Electric Testing Techniques You Need to Know

Yea , an what would you like to know ? You have a direct short to ground on that circuit . Looking at a electrical distribution diagram to see what all that fuse powers should be your first step . Do you know how to trouble shoot a short circuit . Fuse # 26 7.5 amp powers light switch & multifunction switch . Free wiring diagrams here http://www.bbbind.com/free-tsb enter vehicle info. year , make , model an engine size . Under system click on lighting ,then under subsystem click on headlamps . Click the search button them the blue link. Study the wiring diagram ,get a DMM - digital multi-meter an test the electrical circuits . Could be anyone of these switchs , wiring etc....
Electric Testing Techniques You Need to Know

A wiring diagram is a simple visual representation of the physical connections and physical layout of an electrical system or circuit. It shows how the electrical wires are interconnected and can also show where fixtures and components may be connected to the system. Use wiring diagrams to assist in building or manufacturing the circuit or electronic device. They are also useful for making repairs. DIY enthusiasts use wiring diagrams but they are also common in home building and auto repair. For example, a home builder will want to confirm the physical location of electrical outlets and light fixtures using a wiring diagram to avoid costly mistakes and building code violations.
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Wiring diagram for a 3-way switch, one of the many wiring diagrams showing different methods of wiring a three way switch circuit. This electrical wiring diagram shows power into light switch Box #1 – wire to light from switch box #1, and from switch box #1 to three-way light switch box #2.

It could be the low beam relay is bad , or the dimmer switch . You would need to know how to test the circuit . First off you need a wiring diagram of the circuit an a component location diagram ( in case you don't know where the relays are etc... Do you know how to use a test light an a DVOM - digital volt ohm meter . Do you know how to read a wiring diagram ? You could go to you tube an watch some videos on basic electrical trouble shooting . No Low Beam Head Lamp Chrysler Pacifica I know this isn't the same as yours ,doesn't matter . If you can fix one you can fix another ,with right wiring diagrams .

There is only one fuse. It's a 20 amp automotive and is located between the Starter solenoid and the ignition switch. Physically it's usually near the ignition switch.

Here is a link to the wiring diagram. Parts Finder Search Results

hi mate you able to post up the diagram
cheers

I answer questions for free.
I know electrical wiring.
I am unsure about a few things in your question.
Are you wanting to know how to wire a product you purchased?
Are looking for a wiring diagram to see if you can do what your want?

1) Is your circuit a 3-way circuit with 2 switches controlling both lights?
2) Or are there 2 different circuits where each switch controls one light?

Here is a Leviton manual with wiring for occupancy sensors:
http://waterheatertimer.org/pdf/Leviton-IPP0R-1LW.pdf
If you want sensors to replace 3-way switches, you need a control sensor and a remote sensor.


Click link below to see this image clearly
http://waterheatertimer.org/images/3-way-sensor-600.jpg

Add a comment and I will get back to you with specific details about wiring.

Hi Retta_roche,
This circuit is controlled through the switch. In the high position,it by-passes the blower resistor.So if the blower is off in the high position, and the fuse is good, you need to check the switch,blower motor or the wiring.Since the switch physically feels different,start there. Pull the switch and ground pin #4 blk/org wire with the key on. If the fan works,the switch is bad. You need to check the connector at the blower motor for evidence of a burn. If you find the connector burned,you will need to replace the motor and the connector. I am sending the wiring diagram to help you. If you need anything else,drop me a line. Thanks,Chuck