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Edited 6-10-09

Cause is the passlocks contact behind the lock, The female end in the housing section are corroded and a simple solution would be to spray a very small amount of electrical lubricant or wd40 and the the security system should detect the new ignition when inserted.

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Q: You put an new ignition switch in your 2004 Chevy impala but your car won't start now your security light is flashing?
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