Read elsewhere on the net about adding a resistor (or cutting the yellow wire) at the connector to the BCM for a GrandAm instead of at the cylinder. Any info on whether the passlock yellow wire will be easy to find going into the Impala BCM? Didn't know if the BCM connectors would be in the same location for an Impala and a GrandAm.
Here is the link for the GrandAm:
http://www.bergerweb.net/grandamsecurityfix.htm