Ignition switch replaced, car will not start

Tiny
TIKKAKONA
  • MEMBER
  • 2000 FORD MUSTANG
  • 0.5L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 189,000 MILES
Ignition switch replaced out of car listed above, have the old key. We could start it with screw driver and old key. Once put in new ignition switch can't figure out how to program new keys. Car turns tries to start, but won't crank all the way over. Please help.
Tuesday, March 12th, 2019 AT 11:17 AM

1 Reply

Tiny
SCGRANTURISMO
  • MECHANIC
  • 4,897 POSTS
Hello,

You will have to have either a locksmith or the dealership reprogram your new key to your vehicles Passive Anti Theft System (PATS). Your vehicle has a ring around where the lock cylinder goes into the steering column. This ring is like a receiver for a radio broadcast. Implanted into your ignition key is a tiny transponder key, which broadcasts a signal. This signal is then received key the ring and is passed on to your vehicles Power-train Control Module (PCM) which if it matches what is programmed into it will enable your vehicle to start. If it does not match, which is what is happening in your case, the vehicle will not start. I have included the factory description for you as well in the diagrams as well as the door lock and PATS wiring diagrams for you in the diagrams below.

Thanks,
Alex
2CarPros
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Tuesday, March 12th, 2019 AT 6:28 PM

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