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Unread 04-24-2010   #1 (permalink)
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Default passive anti theft on 2005 mustang( car won't crank)

Hi everyone,

I need help! my passive anti theft system on my 2005 mustang has gone into lock down mode,meaning it thinks someone is trying to steal my car and won't let the car crank or even turn over. Any info on how to get the system to go out of this mode would be very appreciated.
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Unread 04-24-2010   #2 (permalink)
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Quote:
Originally Posted by T3audiomustang View Post
Hi everyone,

I need help! my passive anti theft system on my 2005 mustang has gone into lock down mode,meaning it thinks someone is trying to steal my car and won't let the car crank or even turn over. Any info on how to get the system to go out of this mode would be very appreciated.
THE CHIP IN THE KEY IS BAD TRY THE SPARE KEY OR HAVE DEALER CUT AND PROGRAM A NEW KEY:yelpleased:
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Unread 04-24-2010   #3 (permalink)
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Quote:
Originally Posted by aegarfield View Post
THE CHIP IN THE KEY IS BAD TRY THE SPARE KEY OR HAVE DEALER CUT AND PROGRAM A NEW KEY:yelpleased:
tried that, won't work with either key.
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Unread 04-24-2010   #4 (permalink)
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Just curious, what leads you to the conclusion that itís the anti-theft system that's preventing it from starting, as opposed to a malfunction somewhere else?
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Unread 04-24-2010   #5 (permalink)
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Originally Posted by stars View Post
Just curious, what leads you to the conclusion that itís the anti-theft system that's preventing it from starting, as opposed to a malfunction somewhere else?
Because the anti theft lights keeps flashing and car won't make even a sound when turning key over. This has happen in the past & I had to get a lock smith to get it cranked. just want to try and solve it this time if possible without calling lock smith.
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Unread 04-25-2010   #6 (permalink)
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try holding one key backwards so the rubber is toughing the ignition, and putting the other key in the ignition and starting it. the ignition uses a very short range RFID system to identify the key
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Unread 04-25-2010   #7 (permalink)
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I've looked at wiring diagrams and if it's the key causing your problem it may be a blown fuse to anti theft system. Check owners manuel and check your fuses.

http://www.chiltonlibrary.com/conten...ord_121197.pdf
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Unread 04-25-2010   #8 (permalink)
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Quote:
Originally Posted by bassinbob99 View Post
I've looked at wiring diagrams and if it's the key causing your problem it may be a blown fuse to anti theft system. Check owners manuel and check your fuses.

http://www.chiltonlibrary.com/conten...ord_121197.pdf
Thanks I'll try that next.
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Unread 04-27-2010   #9 (permalink)
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I got her running!!! it was the safety switch on the clutch pedal, I unplugged it ,put a jumper on the wires, had to be careful the car was in neutral, cranked right up.
Now all I need to do is get another safety switch.
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Unread 04-27-2010   #10 (permalink)
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My 2003 Ram did the same thing once with the clutch switch - had to have it towed to the dealer. Very annoying.
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Unread 04-27-2010   #11 (permalink)
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Quote:
Originally Posted by T3audiomustang View Post
I got her running!!! it was the safety switch on the clutch pedal, I unplugged it ,put a jumper on the wires, had to be careful the car was in neutral, cranked right up.
Now all I need to do is get another safety switch.
I've gotta ask.....how the hell did you do that :?:
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Unread 04-28-2010   #12 (permalink)
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Originally Posted by pikapp View Post
I've gotta ask.....how the hell did you do that :?:
Very easy, if you look under the dash right behind the clutch pedal you'll see a black switch with a white plunger looking thing,( when you press the clutch to the floor,it comes in contact with the switch) If you look real closely to the switch it has a spring clip on it,just use a pair of needle nose pliers and pull the clip off, then the wire harness will slide off.The switch itself will pull off from the bracket, now take the wire harness(which has two wires attached) and slide a small U shaped wire connector in between the two contacts on the wire plug. Just remember once you do this make sure the car is not in gear.

Remember this is only a temperary fix, until I get my switch, but it's also a way to check to see if the switch is working.
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Unread 04-28-2010   #13 (permalink)
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Glad thats all it was, need to remember that myself in case mine does that in future.
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Unread 04-28-2010   #14 (permalink)
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here's a rough draft I drew, just to give you an idea of what the spade connector looks like and where it went. Just remember to slide the spade connector all the way in the notches,all you need is something to make a complete circuit. the switch is a NO contact ( normally open )
the spade connector will close it,giving a complete path of current. Which in reality turns the two separate wires into one.
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passive anti theft on 2005 mustang( car won't crank)-saleen.jpg  
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Unread 04-28-2010   #15 (permalink)
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Good diagnostics on your part. Being a heavy Diesel truck mechanic, i sometimes will have to do the same thing on a no start problem.
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