What engine 4.3 L , 4.8 l , 5.3 l or 6.0 L ? if 4.3 L
Ignition Coil Driver Module and Ignition Coil
The ignition coil driver module is mounted on a bracket next to the coil. The VCM signals the ICD to turn ON primary current to the ignition coil by pulling the IC line high (4 volts). The ICD 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. The module does not contain backup calibrations that allows the engine to continue to run if the IC signal is lost.
On the 4.8 , 5.3 , or 6.0 L engines
Eight ignition coils/modules are individually mounted above each cylinder on the rocker covers. The coils/modules are fired sequentially. There is an Ignition Control (IC) circuit for each ignition coil/module. The eight ignition control circuits are connected to the PCM. The PCM triggers each ignition coil/module individually and makes all timing decisions. The ignition coil/modules are supplied with the following circuits. Do you have a misfire ? Check engine light on ?
do you have
On
Ignition module. What type of vehicle????
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The instrument panel integration module (IPM)
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The rear integration module (RIM)
Each of the 3 body control modules integrate a number of functional systems under the control of a single module. Each of the modules are connected to the Class 2 serial data line; many control signals are implemented by Class 2 messages.
On vehicles that have several control modules connected by serial data circuits, one module is the power mode master (PMM). On this vehicle the PMM is the DIM. The PMM receives 4 signals from the ignition switch.
To determine the correct power mode the PMM uses the following circuits:
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Accessory voltage
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Ignition 1 voltage
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Ignition 3 voltage
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Off/Run/Crank voltage
Your best bet would be to take to a repair shop that has knowledge of this type system . You probably don't need an ignition switch.
Discrete Ignition Signals
Those modules that have discrete ignition signal inputs also remain in the state dictated by the last valid PMM message received on the serial data circuits. They then check the state of their discrete ignition input to determine the current valid state. If the discrete ignition input is active, battery positive voltage, the modules will fail-safe to the RUN power mode. If the discrete ignition input is not active, open or 0 voltage, the modules will fail-safe to OFF-AWAKE. In this state the modules are constantly checking for a change status message on the serial data circuits and can respond to both local inputs and serial data inputs from other modules on the vehicle.
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