Ford sold a Ford branded alarm through the parts department. These sometimes were a dealer installed option on new cars. Mine would randomly stop responding to the remote and I would have the same symptoms as you describe. I had it removed and the original equipment factory system still worked. Be warned, if you have the Ford "accessory" alarm, your key fobs (remotes) are different and the method to program them is different from what you will read online. You can tell if you have the system by looking at your key fob. The standard Mustang key fob is a 4 button (lock, unlock, panic, and trunk). The accessory alarm uses a 3 button remote and clicking unlock twice would pop the trunk. I really wish I had a picture of the remote because there are 3 button Ford key fobs for cars without a trunk release although I don't think you should have one on a Mustang. Long story short, if you have the accessory alarm, you can solve your problem by having it removed but you will need new 4 button key fobs to remotely lock/unlock your doors
SOURCE: alarm remote
There should be a alarm by-pass (red button under the dash) located on the drivers side above the brake or clutch (if equipted) peddle. Opening the door (as you probably already found out) will set the alarm off, so it's a good idea to let you neibours know what you are doing so the police are not called on you. Once pressing that button, the alarm and the ignition lockouts will be off and will need to be reset before you can arm it again.
SOURCE: flashing alarm light after battery change. Car wont start,
System operation
System arms 5 seconds after switching ignition OFF. Switch ignition ON. Ensure clock LED illuminates for 3-5 seconds. If LED flashes rapidly at regular intervals for approximately 1 minute, then flashes at irregular intervals: Key code not recognised. Remove key and try again.
Programming
When
System malfunction: LED illuminates for 1 minute, then flashes at irregular intervals. Key(s) added or replaced.
NOTE: Replacement keys MUST have blue mark. Keys with red mark are NOT compatible with this system.
How
NOTE: Programming method using vehicle keys can be deactivated using diagnostic equipment.
Obtain 2 programmed keys (A and B). Insert key A into ignition switch. Turn ignition switch to position II. Wait 1 second. Switch ignition OFF. Remove key A. Insert key B into ignition switch within 5 seconds. Turn ignition switch to position II. Wait 1 second. Switch ignition OFF. Remove key B. Within 10 seconds: Insert key to be programmed into ignition switch. Turn ignition switch to position II. Wait 4 seconds. Switch ignition OFF. Wait 5 seconds. Start engine. If engine does not start and clock LED flashes: Switch ignition ON. Wait at least 20 seconds. Switch ignition OFF. Repeat programming procedure. Repeat above procedure to program remaining keys. Keys can also be programmed using diagnostic equipment
SOURCE: my remote entry keypad that controls the alarm
anytime you disconnect the battery for the car or for the remotes you will have to reset the system,i am sorry, but thankfully we dont have the same alarm system in the U.K. so you will,have to check your manual...
SOURCE: My 2006 Ford Mustang's factory alarm goes off when
well im a mechanic for village auto clinic in Hempstead,Ny anyway locate your fuse box under the hood and look for the fuse for the alarm check the owners manual if not disconect the alarm start let battery charge but note dont touch radio or anything just let run for 15 to 20 min then drive to nearst mechanic so they could do further inspection to figure out why this is happning for now respond and let me now how thingsturn out...
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