Grand Caravan V6-3.3L VIN R (2005)
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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
electronically controlled and continuously monitored for malfunctions. Power is supplied through pin 27 of the FCM connector.
Front washer motor
The front washer switch is a direct input to the BCM. The BCM sends a PCI Bus message to the FCM informing it of a request to wash. The front
washer motor is then powered through low side control inside the FCM. This circuit is electronically controlled and continuously monitored for
malfunctions. In addition, the FCM electronically protects the washer motor from system voltages higher than 16 volts by automatically switching off
the low side circuit.
Rear washer motor
The rear washer switch is a direct input to the BCM. The BCM sends a PCI Bus message to the FCM informing it of a request to wash. The rear washer
motor
is then powered through low side control inside the FCM. This circuit is electronically controlled and continuously monitored for malfunctions. In
addition,the FCM electronically protects the washer motor from system voltages higher than 16 volts by automatically switching off the low side
circuit.
Cabin Heater
When the ignition is in Run, the FCM monitors the PCI bus for the Cabin Heater Activation request. The Automatic or Manual Temperature Control
initiates this request only when all conditions for the Cabin Heater activation are favorable. The request carries the status bit that the FCM requires to
activate its Cabin Heater Assist Control output. This output is a low side driver (coming from FCM pin 15) which supplies a ground signal to the Cabin
Heater (pin 5). When the Cabin Heater receives this ground signal input, it interprets this as an activation signal. The FCM low side driver is also
capable of diagnostic sensing. The driver will sense an open circuit when the driver is off, and will sense a short to voltage when the driver is on. The
FCM will set DTC's for both of these types of faults. For additional information, refer to Cabin Heater under General Information and Diagnostic
Procedures in the manual.
Brake shift interlock system
The brake shift interlock solenoid receives power from both high side and low side controls inside the FCM. The high side control is on the same circuit
as the EATX module power, and the low side control comes through pin 47 of the FCM connector. The solenoid is controlled by the low side driver
when the brake pedal is pressed. Both circuits are continuously monitored for malfunctions.
RELAY CONTROLS
Fog lamp relay
The fog lamp switch is a direct input to the BCM. The BCM sends a PCI Bus message to the FCM informing it to turn on the fog lamp relay. The fog
lamp relay is then powered through low side control of the FCM. This circuit is electronically controlled and continuously monitored for malfunctions.
Fog lamp functionality is not equipped on all vehicles. The FCM learns that the vehicle is equipped with fog lamps by reading the BCM PCI Bus
message.
