Okay I have a weird issue if anyone else has experienced this. If I try to put passenger window down with driver side switch it acts like a short, going up is fine. When I use the passenger switch it’s fine and functions normally up and down.
1994 Trans am

“Car Audio and Electronics” is not the best place for routine electrical issues. Let's move this to “General 67-02 F-Body Tech” where there’s more traffic.

yes, when I use the switch on driver side to put passenger window down I can hear a click and the radio will cut out and the the battery voltmeter will drop. I’m thinking express down module or relay?

The express down module/relay is only connected to the driver's window.

http://shbox.com/1/pwr_window_schematic.jpg

ah okay, I was just hoping it wouldn’t be wire short but looks to be that way

There is the possibility that someone has added an aftermarket express down module. There is also an aftermarket wiring kit that improves the wiring between the driver’s side controls and the passenger side window. Either of those could have gone bad, if installed.

Check against the wiring diagram. Note that the one I linked indicates 95 F-Body. That would indiate it is applicable to the Camaro and Firebird. However, the switch connector pinouts may be different. This (also from Shoebox) states it is a Camaro configuration, suggesting the Firebird connector may be different.

http://shbox.com/1/window_motor_switches.jpg

Best source of info for you would be the 1994 factory service manual, free download here (courtesy of GaryDoug):

https://www.mediafire.com/?40mfgeoe4ctti

thanks guys for the help, I’ll get out there in the coming days to do some testing. I’m not sure it’s the switch because I had this issue prior and bought brand new and it still existed. I’ve owned the car since 05 and trying to sort out some issues before selling .