Before we jump into more complicated stuff, when the radio stays on, you might try unplugging the ignition switch connector. If a contact overheated and started to burn or left a carbon track inside the switch, it might pass enough current to power the radio. By "radio lights" do you mean the back lighting for the buttons or the display is staying on? You might find the radio also turns off if you press a power window switch. I can't remember if the windows and wipers are on the same circuit from the ignition switch. Another plan would be to pull the radio to measure the voltages on the switched power and memory power wires. Verifying there is still voltage on the switched power after the ignition switch is turned off will provide a clue. The last thing is the Body Computer which runs the dash lights and the wipers. Before you swap in a different one it is real important to understand what happens when you plug one in. If the car does not have factory anti-theft system, you MUST install an Engine Computer or a Body Computer from another car without the anti-theft system. If your car does have anti-theft, you can use any computer but if it isn't already programmed for anti-theft, it will learn that programming from the other computer as soon as you turn on the ignition switch. That programming can not be undone and from then on that computer will only work in another car with anti-theft. If you borrow a friend's computer from a car without anti-theft and your car has it, it will teach that programming to the borrowed computer. When it is put back in your friend's car it will teach the programming to the other computer. At that point your friend's car won't start until BOTH computers are replaced at the same time.
Saturday, March 12th, 2011 AT 5:37 AM