Ignition Control Module: Description and Operation

Ignition Control Driver (ICD) Module And Ignition Coil:

The Ignition Coil Driver Module is mounted on a bracket next to the coil. The Vehicle Control Module (VCM) signals the Ignition Control Driver (ICD) to turn "ON" primary current to the ignition coil by pulling the Ignition Control (IC) line high (4 volts). The IC turns the primary current "ON" and "OFF" by applying and removing the ground to the primary winding at the appropriate time. This module is of 'minimum function" and does not contain backup calibrations that would allow the engine to continue to rim if the IC signal is lost.