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Check your immobilizer or your key whether lost program or chip ,missing from inside key. I f you have a spare key with immobilizer chip try it to see whether it starts.
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That must be the security system. Check your owner's manual for a reset procedure. Most people will tell you your best bet is the dealership-only they have the electronic testing equipment and expertise to work on factory installed security, especially so if any reprogramming is required. I don't know if that's the case, the owner's manual may shed some light.
you need to get a new ign. lock cylinder and chip key. Or you can get a lock cylinder and copy your old key with a regular key no chip. Take new cylinder, put old chip key in it. Plug into harness at the bottom of steering column just behind the dash, fine orange wire from existing one in the column. Hide lock cylinder under dash and start car with copy of old key.
is your security light in dash flashing if so try to start let off key but do not cut off leave key on so all your dash lights are on let vehicle set for at least 15 mins. flashing security light should stop flashing once it stops flashing start vehicle sounds like it has tripped security
If you want to initiate a new master key....
1. Insert new key into ignition cylinder and turn it to the ON (RUN) position. The security light on the dash will flash for fifteen minutes.
2. When the security light stops flashing, you have FIVE minutes to start the next step. Turn the ignition cylinder OFF and then back to the ON (RUN) position. The security light on the dash will flash for fifteen more minutes.
3. When the security light stops flashing, you have FIVE minutes to start the next step. Turn the ignition cylinder to OFF and then back ON (RUN) position. The dash will flash for fifteen more minutes.
4. After the security light stops flashing the third time, the new key has been programmed into the vehicles computer and will operate the car. It has replaced ALL the previous electronic key codes and is the ONLY key programmed into the vehicles computer.
The dealership should be able to do this for you without a current key, of course this means towing the vehicle to them. See if they will sell you a key and you program it yourself.
hope this helps. I found the above info at FordF150.net
you cant just diconnect it....you may try locking and unlocking the door with the key ....that may disable the alarm otherwise you may need to get it to the dealer for further diagnostics
Anytime you disconnect and reconnect your battery, the factory alarm will arm upon reconnection and the truck will not start. You have to close your doors, then manually lock and unlock the door with your key. This should turn off the security system and you should be able to start the truck.
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