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Discussion Starter #1
I replaced the ECM in my 2004 CTS. Went to do the key relearn and the instructions say
"turn the key to on position, security light will come on and stay on..."
My security light won't stay on, it just keeps flashing.. what am I doing wrong??
 

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CTS 2004 3.2L
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28 Posts
was the new ECM already programmed to your VIN or did you program it afterwards

do you have access to a scan tool
 

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2007 CTS 2.7L
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510 Posts
I believe the new ECM needs to be programmed to your keys with a scantool or dealer. Those keys and FOB are "new" to the ECM. Even if it is programmed to your VIN, there is more to the key and FOB learning.
 

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CTS 2004 3.2L
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have you tried to go through the procedure anyways

try to disconnect the battery for 10min and then reconnect it (preferably the negative post)
then try to do the relearn procedure one more time
also do you have a spare key, if so try to do the relearn with it

if it still not working i would advise you to either check with dealer or local car locksmith to program your key
i would try to make sure if the VIN registered in the ECU is actually correct (need a scan tool for that)
dealer or locksmith should manage to figure it for you
 
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