Did it run before or did you buy it "as is"? The problem sounds like a splice was made into the X-mode power supply instead of the ignition power. Either one is wrong in my book as it makes the car dangerous in a way that is really not required, but hey . . . This power supply is what runs things like the rear window de-fogger or the heater fan or windshield wipers. Things that are not required for the engine to start, so more power can be directed to the starter on cold days. These things lose power when the key is switched to the cranking position and power comes back when the key is released to the run position.