Security light?

Tiny
PEGGY WHITE
  • MEMBER
  • 1999 MERCURY COUGAR
  • V6
  • 2WD
  • AUTOMATIC
  • 100,000 MILES
Changed alternator and battery now car will not turn over. When key is turned dash lights and radio come on but no engine sound. Security light blinks until you turn key on to start then remains on. Is it the anti they system messing up? I do not have the original key I had to have one made.
Tuesday, July 10th, 2018 AT 6:09 AM

3 Replies

Tiny
ROL*S.
  • MECHANIC
  • 61 POSTS
Hi Peggy,

Your car could have either of two different anti-theft systems. Active or Passive. The passive system disables the car to crank or start. I added an image that shows how the security blinks when there is a malfunction. Basically your key needs to be programmed. You might have a local shop that can do it but it is probably a dealer job.
Did that key start the car before the alternator and battery was replaced?
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Saturday, July 14th, 2018 AT 12:05 PM
Tiny
PEGGY WHITE
  • MEMBER
  • 3 POSTS
It is a passive system I do believe, but it also has a remote start anti theft. I do not have the original key or key fob to reset it. Had to have a locksmith make a key for it but it did start it prior to the alternator being replaced.
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Wednesday, December 12th, 2018 AT 6:33 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
Can you turn on the headlights then try to crank the engine over, have someone watch the lights to see if they go out when you crank the engine over. Please let me know, Ken
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Saturday, December 15th, 2018 AT 10:52 AM

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