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  1. ECM replaced, Passkey III issues

    Cadillac CTS First Generation Forum - 2003 - 2007
    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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