Grand Caravan V6-3.3L VIN R (2005)
Power Distribution Module: Description and Operation
Front Control Module
The Front Control Module (FCM) is an electrical control and interface center located in the engine compartment. When it is mated to the Power
Distribution Center (PDC), it is referred to as the Integrated Power Module (IPM). The IPM, with its fuses and relays provides power and signal
distribution throughout most of the vehicle. The FCM receives both hard wire and digital electronic inputs from the vehicle electrical system through the
PDC. Based on these inputs and the ignition switch position, it provides direct power feeds and relay control to some of the vehicles most critical
electrical systems.
The Front Control Module provides the following features:
Controlled power feeds:
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Front airbag system
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Headlamp power
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EATX module power (4 speed only)
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Front washer motor
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Rear washer motor
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Cabin Heater
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Brake shift interlock system Relay controls:
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Fog lamp relay (when equipped)
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Park lamp relay
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Front wiper on relay
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Front wiper high/low relay
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Accessory relay
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Horn relay
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Front & rear blower relay
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Name brand speakers (NBS) relay
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Adjustable pedals relay (non-memory)
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Electronic back light (EBL) run only relay
Electrical inputs:
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Headlamp battery supplies 1 & 2
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Module battery supply
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Power ground
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Ignition switch RUN or START position status
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Ignition switch START only status
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PCI Bus
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Stop lamp switch
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Horn switch
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Back-up switch
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Wiper park switch
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Washer fluid level switch
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Brake fluid level switch
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Ambient temperature sensor
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Right park lamp outage
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Left park lamp outage
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Battery IOD
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Battery (+) connection detection
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Flash reprogramming voltage
CONTROLLED POWER FEEDS
Front airbag system The FCM provides power to the Occupant Restraint Control (ORC) system through two fuseless circuits (ORC RUN/START, and
ORC RUN only). These circuits are electronically controlled and continuously monitored for malfunctions. Power is supplied while the ignition switch is
in the RUN and START positions on pin 48 of the FCM connector, and in the RUN only position on pin 29.
Headlamp power
The headlamp switch is a direct input to the BCM. The BCM sends a PCI Bus message to the FCM informing it of a headlamp switch status change. The
FCM then turns on power to the headlamps through four fuseless circuits. These circuits are electronically controlled and continuously monitored for
malfunctions.Power is supplied to each filament in a separate circuit. For vehicles equipped with Daytime Running Lamps (DRL), the FCM
electronically steps down the headlamp voltage to provide the desired illumination.
EATX power
The electronic automatic 4 speed transmission module is powered when the ignition switch is in the UNLOCK, RUN or START positions. This circuit is
