power window electrical help

[still2hi]

First off this is on a 99 grand prix 4 door. Also I am decent with electrical but not a genuis.

 

I am having problems with the drivers side rear window. It will only go down with the rear controls, not the drivers controls.

 

If I jump the motor with a power supply it will go up and down. I have tested the leads going into the motor (coming from the switch) and both ways it shows 12 volts. So then I thought it was the plug (maybe a bad prong or something), so I went and got a new one. I hooked the wires together and still only goes down with the rear control, not the front. I cut the wires pushed the plug in and jumped the leads coming off the plug and the window went up and down. So this rules out: bad motor, bad plug, bad switch.

 

What else could it be?

 

Thanks for any help or suggents in advance.

 

Brandon

[Guest 614Streets]

You tested both sets of switches right? Did you check for power coming from the front switch? The wires may be colored white and purple. A easy way to isolate the area of the problem is to cut the 2 wires going into the motor coming from the front switch 1 at a time and then try the rear switch after each cut (reconnect 1 after cutting the other, it should go up and down now.

 

From there you have to determine is it the front switch or a short circuit. Remember The 2 switches work in series

 

Check the front switch. Check to see if the front door has a module or the car itself has a body controller module also.