How do you change the icm on a Saturn 2005?

To change the Ignition Control Module (ICM) on a 2005 Saturn, first disconnect the negative battery terminal to ensure safety. Remove the engine cover if necessary, then locate the ICM, which is mounted on the ignition coil assembly. Disconnect the wiring harness and remove the screws or bolts securing the ICM, then replace it with the new unit. Reconnect the wiring, reassemble any components removed, and reconnect the battery.