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Ignition/ theft deterrent system

Tiny
SHELL5162
  • MEMBER
  • 2001 OLDSMOBILE ALERO
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 174,000 MILES
We were replacing the ignition on a 2001 Alero. When the new ignition was plugged into the theft deterrent system, the car starts. What is going on?
Wednesday, July 20th, 2011 AT 3:49 AM

7 Replies

Tiny
FACTORYJACK
  • MECHANIC
  • 4,159 POSTS
Did you replace the lock cylinder only? I believe the theft lock sensor is in the housing that the cylinder slides into. It just contains a magnet. Are you wondering why it started?
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Wednesday, July 20th, 2011 AT 4:52 AM
Tiny
SHELL5162
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Yeah I'm wondering why it started, As soon as the connection is made between the theft deterrent plug and the cylinder itself the car starts, without the key being turned. I did not replace anything. The ignition was taken out to bring to the locksmith so another key could be casted, as mine was worn.
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Wednesday, July 20th, 2011 AT 4:55 AM
Tiny
FACTORYJACK
  • MECHANIC
  • 4,159 POSTS
I see what you are saying. The lock cylinder goes all the way in and locks into the housing, is the key still in the 'off' position?
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Wednesday, July 20th, 2011 AT 5:01 AM
Tiny
SHELL5162
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Yes
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Wednesday, July 20th, 2011 AT 5:02 AM
Tiny
FACTORYJACK
  • MECHANIC
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Does the key/cylinder rotate normally, in all the positions?
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Wednesday, July 20th, 2011 AT 5:08 AM
Tiny
SHELL5162
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  • 4 POSTS
Yes. Other than the car automatically starting, I cant see anything else that doesnt seem right.
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Wednesday, July 20th, 2011 AT 5:10 AM
Tiny
FACTORYJACK
  • MECHANIC
  • 4,159 POSTS
The only thing that makes sense, is the ignition switch is faulty. I can't explain why removal and insertion of the cylinder caused it to go that way. There is not much else involved. Looking at the procedure, you remove the ignition switch to access the release for the cylinder, is that correct?
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Wednesday, July 20th, 2011 AT 5:14 AM

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