Just bought an 06' f-150 about a month ago everything was in working order and now lone behold a problem. Not sure if it is significant or not but a problem is a problem none the less. To start the driver side door will no longer unlock either door, replaced the switch hoping/thinking it was just faulty but still no luck, tried to unlock and lock it from the passenger side to make sure that it isn't the actuators and confirmed that it is not the problem so I am left wondering what could it be? Was thinking maybe a relay? or a fuse? but I have no idea where the relay would be and it wouldn't make sense to me being a fuse for unlock and another separate fuse for lock but hey if there is, help a brother out. Next battery died after a week of sitting, checked the battery and alternator to make sure that it wasn't those to blame for the problem and both were fine. I know that there is a after market security system on the truck and that is the suspect thus far to being the Drain I am Having, still yet to hook up a multi meter to see how big of a drain it is though. third is that the CD player does not turn on nor do the lights turn on once you shut the truck off and open the door, I have to manually turn the CD player off to keep it from draining the battery even more. If anyone could help me out that would be great. Feel like I fell for a little trap buying from the dealership. trying to work something out with them but until I hear back I am still trying to make amends. Thank you for any help

 

my first thought would be to blame the aftermarket wiring system. The radio? CD, etc should go thru the ignition switch system so that it only has power with the key on. ( the trucks somehow are tied to the door open switch so they stay running with key off until the door is open).... I think a better idea would be to wire to the aux key position wiring so that the radio is off when key is turned off. If the wire is always hot, that is not good. Power needs to be shut down when key is turned off.

 

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