I’ve had this truck for a little over 3 years and started having problems about 9 months ago with that im assuming to be an anti theft problem. When it first started happening i would start the truck and the security light wouldn’t go away then the truck would die a few moments later. That hasn’t happend for a while now but if you hold the window switch up to long the security light comes on losses most gauges and the doors lock. Then if you hold the brake to long at a stop light the security light comes on and doors lock about every 5 seconds. It also goes on a frits if the heater gets turned up to high, almost like if the cab uses to much power the truck starts going nuts. Any help on where to start looking would be greatly appreciated!