Grand Caravan V6-3.3L VIN R (2005)
Park lamp relay
The park 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 park lamp relay. The park
lamp relay is then powered through low side control of the FCM. This circuit is electronically controlled and continuously monitored for malfunctions.
Front wiper on relay
The front wiper switch is a direct input to the BCM. The BCM sends a PCI Bus message to the FCM informing it to turn on the front wiper on relay. The
front wiper on relay is then powered through low side control of the FCM. This circuit is electronically controlled and continuously monitored for
malfunctions.
Front wiper high/low relay
The front wiper switch is a direct input to the BCM. The BCM sends a PCI Bus message to the FCM informing it to turn on the front wiper high/ low
relay. The relay switches power between the low speed and high speed windings of the wiper motor. The front wiper high/low relay is powered through
low side control of the FCM. This circuit is electronically controlled and continuously monitored for malfunctions.
Accessory relay
The accessory relay works in conjunction with the FCM's power accessory delay feature to control the operation of the radio, power windows, washer
motors,wiper motors and power outlet. The accessory relay is turned on through low side control on pin 35 of the FCM. This circuit is electronically
controlled and continuously monitored for malfunctions. Depending on the ignition switch position, the accessory relay will remain on or will time-out
and turn off. The accessory relay remains on in the RUN and ACCY positions of the ignition switch. In the UNLK and OFF positions, the relay will
remain energized for 45 seconds then turn off. During this time-out period, if the driver or passenger doors are opened, the relay will turn off
immediately. While the ignition switch is in the START position, the relay will also drop-out, then resume operation. Accessory relay operation is most
noticeable by observing the operation of the radio or blower functions.
Horn relay
The horn relay operates through a direct wire input to the FCM from the horn switch (FCM pin 17) , or a PCI Bus message from the BCM. The relay
responds to the horn switch, remote door lock and VTA alarm functions. The horn relay is powered through low side control on pin 10 of the FCM.
Under normal operating conditions, if the horn is pressed for longer than 30 seconds, the FCM will automatically deactivate the horn to prevent damage
to it. The FCM will re-activate control of the relay after a 25 second cool-down period. This circuit is electronically controlled and continuously
monitored for malfunctions.
Front and rear blower relay
RS with MTC
Upon ignition on, the A/C-Heater Control Module sends a blower relay on request to the FCM over the PCI Bus.The front blower relay and the rear
blower relay, if equipped, are then powered through low side control through FCM pin 30. The relay provides the high side to the blower motor, and the
blower speed is governed through low side control in the A/C-Heater Control Module. This circuit is electronically controlled and continuously
monitored for malfunctions.
RG with MTC
Upon power up (Power switch on), the A/C-Heater Control Module sends a blower relay on request to the FCM over the PCI Bus. The front blower
relay is then powered through low side control through FCM pin 30. The relay provides the high side to the blower motor, and the blower speed is
governed through low side control in the A/C-Heater Control Module. This circuit is electronically controlled and continuously monitored for
malfunctions.
Name Brand Speakers (NBS) relay
The NBS relay operates through the vehicle bus interface between the radio and the FCM. When the radio is turned on, the radio sends a PCI Bus
message to the FCM. The NBS relay is then powered on through low side control on pin 11 of the FCM. The relay supplies power to the amplified
speaker, and ground is supplied through the radio. This circuit is electronically controlled and continuously monitored for malfunctions.
Electronic Back Light (EBL) relay
The rear defrost switch is part of the Automatic Temperature Control or A/C-Heater Control Module (Manual Temp). When the ignition switch is in the
RUN position and the rear defrost switch is turned on, the ATC or A/C-Heater Control Module sends a PCI Bus message to the FCM. The EBL run only
relay is then powered through low side control on pin 31 of the FCM. The relay provides the high side to the rear window defrost grid, and ground is
attached to the vehicle body. The FCM will only allow the rear defrost to operate in the RUN position. This circuit is electronically controlled and
continuously monitored for malfunctions.
Adjustable Pedals Relay (Non-Memory)
