Dodge dakota 2002 Service Manual page 1244

DR
FRONT CONTROL MODULE (Continued)
Fig. 5 INTEGRATED POWER MODULE MOUNTING
1 - INTEGRATED POWER MODULE MOUNTING HOLES
2 - BATTERY TRAY ASSEMBLY
3 - FRONT CONTROL MODULE
tery and provides the primary means of circuit pro-
tection and power
electrical systems. The front control module controls
power to some of these vehicle systems electrical and
electromechanical loads based on inputs received
from hard wired switch inputs and data received on
the PCI bus circuit (J1850).
For information on the Integrated Power Mod-
ule Refer to the Power Distribution Section of
the service manual.
OPERATION
As messages are sent over the PCI bus circuit, the
front control module reads these messages and con-
trols power to some of the vehicles electrical systems
by completing the circuit to ground (low side driver)
or completing the circuit to 12 volt power (high side
driver). The following functions are Controlled by
the Front Control Module:
• Headlamp Power with Voltage Regulation
• Windshield Wiper "ON/OFF" Relay Actuation
• Windshield Wiper "HI/LO" Relay Actuation
• Windshield Washer Pump Motor
• Fog Lamp Relay Actuation
• Park Lamp Relay Actuation
• Horn Relay Actuation
The following inputs are Received/Monitored by
the Front Control Module:
• B+ Connection Detection
8W-97 POWER DISTRIBUTION
TABS
distribution for all
• Power Ground
• Ambient Temperature Sensing
• Ignition Switch Run
• Washer Fluid Level Switch
• Windshield Wiper Park Switch
• PCI Bus Circuit
DIAGNOSIS AND TESTING - FRONT CONTROL
MODULE
The front control module is a printed circuit board
based module with a on-board micro-processor. The
front control module interfaces with other electronic
modules in the vehicle via the Programmable Com-
munications Interface (PCI) data bus (J1850). In
order to obtain conclusive testing the Programmable
Communications Interface (PCI) data bus network
and all of the electronic modules that provide inputs
to, or receive outputs from the front control module
must be checked. All PCI (J1850) communication
faults must be resolved prior to further diagnosing
any front control module related issues.
The front control module was designed to be diag-
nosed with an appropriate diagnostic scan tool, such
as the DRB III . The most reliable, efficient, and
accurate means to diagnose the front control module
requires the use of a DRB III
proper Body Diagnostic Procedures manual.
Before any testing of the front control module is
attempted, the battery should be fully charged and
vehicle
all wire harness and ground connections inspected
around the affected areas on the vehicle.
REMOVAL
(1) Disconnect the positive and negative battery
cables from the battery.
(2) Partially remove the integrated power module
from the engine compartment (Refer to 8 - ELECTRI-
CAL/POWER
POWER MODULE - REMOVAL).
(3) Remove the front control module retaining
screws.
(4) Using both hands, pull the front control module
straight from the integrated power module assembly
to disconnect the 49-way electrical connector and
remove the front control module from the vehicle.
INSTALLATION
(1) Install the front control module on the inte-
grated power module assembly by pushing the
49-way electrical connector straight in.
(2) Install the front control module retaining
screws. Torque the screws to 7 in. lbs.
(3) Install the integrated power module (Refer to 8
- ELECTRICAL/POWER
GRATED POWER MODULE - INSTALLATION).
(4) Connect the positive and negative battery cables.
8W - 97 - 5
scan tool and the
DISTRIBUTION/INTEGRATED
DISTRIBUTION/INTE-