Need to know the vehicle and what type of diagnostic port. The problem might be with your computer's ability to connect.
The exterior lighting is computer controlled. You need to have the under hood computer, called a TIPM, checked for codes. If it thinks it sees a short circtui it takes the power away.
Try going up one grade in fuel octane
Power save will kick in when your battery is basically under 5-2%. To reboot your computer, plug in your power supply and press the power button.
Use a power supply tester. You can get them on ebay for under $5.
under factory codes the 12 says "battery power to computer disconnected in last 50 to 100 cycles; memory standby power lost (1983 through 1990)" the 54 says "problem with the distributor synchronization circuit-no sync pick-up signal detected during operation" the 55 says "end of signal output" These codes are from a Dodge dealer
The Dewey Decimal number for a book of secret codes for Game Boys would typically fall under the category of 793.93, which covers "Computer games."
It is from power supply It is the cube with many holes for the wire It is located in the bottom left of the computer case probably under the motherboard and the video card
by going to start and looking under my documents.
Diagnostic codes are generated by your on-board computer. They tell you what problems the computer has identified with your engine. The codes are numbers. The code numbers are read by an instrument that plugs into a special jack under the dash. Auto parts stores often will check your diagnostic codes for free, or you can have your dealer do it.
Power supplies are rated at the maximum wattage they can put out. Of course, a computers requirements vary depending on what the computer is doing, so a computer power supply should be of the same, or greater, wattage requirement of the computer when under it's greatest load.
In the computer. If check engine light is on you can get them by plugging a reader into port under dash,.
When you turn your computer on, it runs a self-diaganostic to make sure everything is working properly. This is called the Power On Self Test, also known as POST. When POST detects an error, it emits a series of beeps. These are called beep codes. Your 4 beeps is a beep code because something is wrong with your computer. If you still have your motherboard manual, look under beep codes and look for 4 beeps, and it will tell you what is wrong. If you don't have your manual anymore, you have to search on google for beep codes for your specific motherboard. Every computer has a different set of beep codes, so you have to find your specific ones to find out what is wrong. -Jesse