I had some speakers installed in my 2001 Blazer LT 4 Door, and now the window controls on all of the passenger doors don't work the windows. I removed the panels and checked all connections but everything looks OK. The widow lock is not on and I can control everything fine from the drivers door but not passengers. However when operating from the drivers side and pressing a passenger control it stops the window operation. What could be causing this? Whats next? Also, I can work the locks just fine.

 

If you push a button on the drivers controls and it stops a passenger window that's normal (passenger switches work only if drivers are at rest position) If they all worked before then recheck the 4 pin connector 2nd from the front on drivers side - passenger window lockout switch. If it's snapped in correctly look closely at your connectors to see if a wire walked back out of the connector. If all the wires look to be good pull the 4 wire connector out of the drivers lockout control and jump the dark blue to the dark green with a piece of wire, this is like turning the lock off. If that works the lockout switch is bad.

 

Bad lockout switch going to pick one from another. Thanks for the tip

 

Thanks for this helpful info.