I cannot operate windows on 2002 impala. you can run a seperate 12 volt source to the motor and it will operate window. also all the windows don't work. there is 12 volts at the switches but they will not operate window. switches have been checked ok and motor and regualtors ok, any suggestions

Possible bad window switch. If the window motor were bad, or if power was not getting to the switch, the window wouldn't work at all. The switch should be tested for correct operation. Remove the switch and apply 12 volts to the power terminal of the switch. Then toggle the switch and use a 12 volt test light to confirm continuity on the up and down terminals. If it is defective, replace it with a new switch.

these should be the correct wire colors
light blue wire and a white wire drivers side
brown/white wire and puple white passanger side
meter these wires at the drivers side switch these wires should meter +12 volts in on direction either up or down and -12 volts in the other direction either up or down
Example: put the red probe on the light blue wire and the black probe on the white wire throw the switch in the up direction you shpuld get a reading of +12 volts and if you throw the switch in the down position you should get -12 volts. if the switch is in the nuteral position it wont give out voltage.
if voltage is not present in when you flip the switch then the switch is bad and you will need to replace it.
if voltage is present your motor or motors transmission is bad. sometimes the motor is connected to the transmission and when swaping out the motor you have to swap out the transmission too. most of the times you can seperate these two.
the reason you window will go down and not up might be beacuse the wieght of the window pulls the window down but the transmission is broken and the motor alone cannot lift the window up.
hope this helps.

If it's electric it could be the motor too,, remove the inside door panel, to get access to the inside of the door,, once in,, look for the 2 wires that hook up to the window motor, unplug the connector, and supply the motor with 12volts DC from an outside source, Like jumper cables with jumper wires with alligator clips, if it works its the regulator, or possibly the window relay for that door, if its a manual window, ( hand crank, your going to have to replace the regulator to get the window up, you could unhook the window from this, But keeping the window up could be a problem

Check whether 12 volt input is coming to brake switch connector 12 volt input is require to on brake light you can check with 12 volt bulb.

the power window has a motor in it which requires 12 volts to work. when you remove the battery there is no source of 12 volts unless you have the engine running and the alternator is putting out electricity. so the power window will just not work. your house lights don't work when you unplug them, same principle at work here.

REMOVE THE DOOR PANEL TO GET TO THE WINDOW MOTOR. REMOVE THE CONNECTOR ON THE MOTOR. LOOP A TEST LIGHT FROM BOTH TERMINALS. WITH THE KEY ON AND BOTH SWITCHES IN PLACE, CHECK TO OPERATION OF THE SWITCHES. IF THE LIGHT COMES ON IN BOTH DIRECTION THE WINDOW MOTOR IS BAD.

THERE IS A CIRCUIT BREAKER BUILT INTO THE WINDOW MOTOR. SOMETIME HITTING THE MOTOR WITH MAKE THE CIRCUIT BREAKER RESET BUT THE MOTOR WONT LAST LONG DOING THAT.

ALSO TRY PULLING DOWN ON THE WINDOW WHILE TRYING THE SWITCHES. THE WINDOW COULD JUST BE STUCK. THIS HAPPENED TO ME.

no. all the windows get their power from the driver switch. you need to actually check the circuit..using a volt meter check for power and ground..you are missing one of them..

Take the door panel off unplug the motor push the window button see if you have 12 volts. If you do look for the ground wire for this motor if it is ok and you have 12 volts the motor is probably bad

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,

Does it work from the back window controls? Or regardless of location, windows don't roll down. If it's the first one, then I'd suspect the window controller in the front door is malfunctioning or the wiring headed to the back door. If it's the second option, you should remove your door panel and check the motor. Unplug the plug for the motor and either use a volt meter (or a 12volt test light if you don't have that...it's cheap) and operate the window switch. If you are getting 12 volts or the light lights, you know the motor is the problem. Let me know if you need to know how to pull the door panel off.