I need an electrical diagram showing wiring from the base,to power windows on a 2003 Chevrolet Venture,my power windows won't work either side in my 2003 Venture,checked power at fuse box next to glove box,no voltage!any suggestions?

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You probably have a ground issue , looking at a wiring diagram or ground distribution diagram to see if these share a commom ground point or share power from same fuse,https://www.youtube.com/watch?v=WoN1nou5t1Q&t=224s circuit with a high resistance problem . Do you know how to test automotive electrical circuits with a DMM - digital multi-meter , how to read an use a wiring diagram to pin point test spots in a circuit . Free wiring diagrams at http://www.bbbind.com/free_tsb.html . Check out these videos on voltage drop testing an basic electrical testing . This is the way to find electrical problems .
Mastering Voltage Drop Testing with Pete Meier and Jerry Truglia YouTube
Electric Testing Techniques You Need to Know

Basic Electricity for Service Techs Ohm law Current Flow Opens Shorts

good luck !

Power back feed through the electrical systems ,maybe . Looking at a wiring diagram to see if these share a body ground point would be the thing to do. Do you know anything about automotive electrical circuit's ? What the difference is from B+ voltage side of the circuit and the ground side . Do you know what a wiring diagram is ,how to read one ? Scanner wouldn't show anything in these cases . Testing the electrical circuits for the affected systems is the only way .
Electric Testing Techniques You Need to Know
Mastering Voltage Drop Testing with Pete Meier and Jerry Truglia
Free wiring diagrams here http://www.bbbind.com/free_tsb.html Enter vehicle info. year , make , model and engine size . Under system click on lighting ,then under subsystem click headlamps .Click the search button then the blue links . Then change systems , from headlamps to HVAC - heater , then to transmission an shift inter lock ,this has a electrical controlled lock solenoid that won't allow the shifter to move ,unless drivers foot is pushing the brake pedal. Watch the videos ,buy a DVOM - digital volt ohm meter . test the circuits . Or show all this to your mechanic .

can you manually shift the neutral safety switch while connected and test it in all positions to see which position lights the ignition side?

Learning how to do automotive electrical trouble shooting . Basic Electricity for Service Techs Ohm law Current Flow Opens Shorts
Reading wiring diagrams !
The Trainer 32 How To Read An Automotive Block Wiring Diagram
.Finding wiring diagrams
http://www.bbbind.com/free_tsb.html enter vehicle info year , make , model an engine size . Under system click engine , under sub system click fuel controls . Click the search button one link pops up , click on that .Third diagram down is fuel pump electric diagram . See there are two connectors in that wiring harness , C - 200 & C - 305 . Plus you will see the power wire is gray . Find the connectos check for B+ voltage along the harness

The Trainer 29 Understanding How Electrical CIrcuits Work and How to Test...
The Trainer 23 How To Repair Wiring and Wiring Connectors

sounds like a bad switch, which is very common on the gm line of mini vans..

If it is a power widow-pop the switch from the arm rest and then unplug it from the wiring-may need a screw driver the first time as the hold down clips may be snug. Make sure in ignition is off and then take two large paper clips and pull them open and bend to a U shape. Jumper one from the black wire to the dark brown wire and the other from the medium blue wire to the yellow wire. Turn on the igition and the window will go up. Works everytime on my 2004. I now leave it unplugged so it won't accidently get opened. Go to the wrecker and get another switch, if you can find a car that has one left in it.
Gary

Get a window circuit wiring diagram
& continue your testing

Take the radio off. Check if there is power coming to red wire. If not run new hot wire to red wire. Check also ground on it. If no ground then run ground on it. its easy run new wire then fixing the wire.

call any gm parts dept they can print one up for you just give them your vin Please rate my response thank you very much