Question about 1991 Ford Aerostar Extended
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Posted on Jan 02, 2017
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The instrument panel integration module (IPM)
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:
Ignition 1 voltage
Ignition 3 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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If this concern is encountered, inspect
circuits 406 (IC Control for 2/3 Coil) and 423 (IC Control for 1/4 Coil) for an
intermittent short to ground or poor connection on either end. Depending on the
model, these circuits may short on the AC lines near the AC compressor, on the
transmission mount, or on the transmission lines where they enter the
transmission. If there is no problem found with these circuits, inspect the
ignition control module ground to ensure that it is clean and tight.
If there is no problem found after performing
the suggestions above and the SI diagnostics lead to ignition module
replacement, replace the ignition module as directed but also replace all of the
spark plugs and clean the ignition module ground to possibly prevent future
ignition module damage. ( use OEM plugs) Before installing the new ignition module. If the spark plugs
are worn sightly or have a high resistance They will cause the ignition module
to repeatedly fail.
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.
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