To reset the Ford 500 anti-theft system, begin by removing the positive terminal cable from the battery, place the key in the car and switch it to the on mode, then fix the positive cable, turn the key off and then reset the alarm. This can reset the anti-theft system so that it is now available to start the car properly. Often this can be triggered by replacing the battery or by draining the battery from the power supply. This may also be triggered by the pass lock sensor being defective, which would cause the anti-system to go off and prevent the car from running. If you have access to an OBD diagnostic tool, you can also use it to reset the anti-theft device.
Harold P.
April 10, 2020
If wanting to reset the anti theft device on a ford 500, the only proper method that can be used is using a car scanner to read the code.
I have a ford five hundred 2005 limited and tye battery on my car died. After I changed the battery, the horn started to blare and the engine wasn't starting. Apparently, it was an issue with the passive anti theft system and it wasn't allowing it to start. The solution is whenever you change the battery on this car one is supposed to take off the positive terminal off and then another person needs to sit in the car and hold the key to start the engine while pressing a small black switch which is under the left side of steering wheel near driver's left knee, at the same time when you try to start it another person need to connect the positive terminal and the car will start. The dealership asked me to tow in the car and said they will charge 200$ for it. Additionally, before I put in the new battery, when I jump started the car, I saw all kinds of lights like check engine, check transmission, check charging system and now after changing the battery and doing the above steps all lights are gone and car worked fine and I hope it keeps driving fine.
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