GM-GMC: Interlock Ignition Cable, negative battery cable, chevy malibu

Question
I am trying to replace the Key Tumbler in a 2003 Chevy Malibu. I can not get the Interlock Cable disconnected. I pushed the button in on the side and it appears to be loose but will not come totally out. What is the trick to disconnecting this cable???

Answer
Here is the full service procedure for the ignition switch and lock cylinder removal...if it doesn't contain what you need repost and I will try to help more.

Disconnect the negative battery cable.
Remove the airbag fuse
Remove the accessory trim plate from the I/P carrier. Remove the instrument panel cluster from the I/P carrier.  

Remove the ignition switch bolts from the ignition switch.
Insert the key into the ignition switch lock cylinder. Rotate the key to the ON position.

If the ignition switch lock cylinder is seized or won't rotate, perform the following procedure:
 Protect the immediate work area with suitable material such as clean shop towels or a clean fender cover.

Locate the surface for the ignition switch lock cylinder release button on the plastic ignition switch housing.

On the key entry side of the switch housing center punch a location on the rib approximately 3/8 of an inch from the cylinder release button

Carefully drill a pilot hole through the plastic housing with a 1/8 inch drill bit.

Using a 9/32 inch drill bit carefully drill a hole at the pilot location, and slightly into the ignition switch lock cylinder surface to break the release button retaining spring.

Remove portions of the broken spring from the hole using a small suitable tool.

Grasp the ignition switch lock cylinder and remove the cylinder from the switch housing.

Remove any plastic flashing from the drilling operation, and using compressed air blow out the ignition switch assembly.

Disconnect the electrical connectors from the ignition switch.
Release the transaxle park/lock cable retainer, then pull outward to remove the cable from the ignition switch.

Press the ignition switch lock cylinder release plunger. The release plunger is located at the four o'clock position on the ignition switch housing.
Use the key in order to pull the ignition switch lock cylinder from the ignition switch housing.

Disconnect the pass key electrical connector from the ignition switch housing.
Remove the ignition switch housing through the opening in the I/P cluster.

Hope this helps