The last two days in my 05 mustang there has a been a problem with the interior accessories getting power. The after market radio, power windows, power locks will turn on and off. If you increase the current demand by for example trying to roll the windows up you can hear the mini relay in the passenger side fuse box switch close. The power to all those devices will suddenly stop. It does this randomly as well. I have checked all the fuses and relays to make sure it wasn’t something that simple and I am pretty sure I have good ground connections across the board. I’m not really sure what it could be or how to fix it, any ideas?

 

Does the car sit outside? Feel the carpet on the passenger's side, see if it feels wet. It may be the Smart Junction Box has moisture in it. Do a Search for LEAKS. Unfortunately, there have been tons of reported issues with the dreaded leak that causes havoc in electrical systems. Let us know what you find.

 

It was raining two days ago when I first noticed it, but i didn’t think to check it then. As of right now i don’t see any or feel any moisture in or around that area. I should also note that it first began with the power doors not working with my keyfob, and that the car would think that one of the doors is slightly open then it progressed to the scenerio now.

 

Could it be the ignition switch? I see that it’s tied into the audio unit and some other power distribution sjb’s?

 

what is the smart box & where isits location

 

It controls electrical functions within the vehicle. It is located behind the passenger side kick panel.