Chrysler Crossfire. Manual - part 181

BODY CONTROL MODULE

DESCRIPTION

BODY CONTROL MODULE

The Body Control Module (BCM) (1) is concealed in the engine compartment inside of the Control Module Box (2)
located next to the battery (3).

The BCM utilizes integrated circuitry and information carried on the Controller Area Network (CAN) bus along with
many hardwired inputs to monitor many sensor and switch inputs throughout the vehicle. In response to those
inputs, the internal circuitry and programming of the BCM allows it to control and integrate many electronic functions
and features of the vehicle through both hardwired outputs and the transmission of electronic message outputs to
other electronic modules in the vehicle over the CAN data bus.

The BCM for this model is serviced only as a complete unit. A BCM can only be repaired by or replaced through an
authorized electronic warranty repair station. Refer to the latest version of the Warranty Policies and Procedures
manual for a current listing of authorized electronic repair stations.

CONTROL MODULE COOLING FAN

The Control Module Cooling Fan is used to decrease the heat that is generated by the Transmission Control Module
(TCM) and the Audio Amplifier. The Control Module Cooling Fan is located inside of the front lower section of the
Control Module Box. The Cooling Fan is wired to the BCM and is activated when the ignition is On. The Cooling
Fan is attached to a flexible duct that runs down to the passenger foot well, and circulates air to the modules. The
fan is used to cool the modules that are mounted in the passenger compartment.

ELECTRONIC CONTROL MODULES - SERVICE INFORMATION

8E - 101

DESCRIPTION - RHD

BODY CONTROL MODULE

The Body Control Module (BCM) (2) is concealed in
the engine compartment inside of the Control Module
Box (1) located next to the battery (3).

The BCM utilizes integrated circuitry and information
carried on the Controller Area Network (CAN) bus
along with many hardwired inputs to monitor many
sensor and switch inputs throughout the vehicle. In
response to those inputs, the internal circuitry and pro-
gramming of the BCM allows it to control and integrate
many electronic functions and features of the vehicle
through both hardwired outputs and the transmission
of electronic message outputs to other electronic mod-
ules in the vehicle over the CAN data bus.

The BCM for this model is serviced only as a com-
plete unit. A BCM can only be repaired by or replaced
through an authorized electronic warranty repair sta-
tion. Refer to the latest version of the Warranty Poli-
cies and Procedures manual for a current listing of
authorized electronic repair stations.

CONTROL MODULE COOLING FAN

A Control Module Cooling Fan is located inside of the front lower section of the Control Module Box (1). The Cooling
Fan is wired to the BCM and is switched on when the ignition is On. The Cooling Fan is attached to a duct which
pulls cabin temperature air from the passenger compartment and circulates it into the Control Module Box in order
to decrease the heat that may be generated by the Powertrain Control Module (PCM), the BCM, and the Relay
Control Module.

OPERATION

The Body Control Module is designed to control and integrate many of the electronic features and functions of the
vehicle. The microprocessor-based Body Control Module hardware and software monitors many hardwired switch
and sensor inputs as well as those resources it shares with other electronic modules in the vehicle through its com-
munication over the Controller Area Network (CAN) Bus. The internal programming of the Body Control Module
microprocessor allows the Body Control Module to determine the tasks it needs to perform and their priorities. The
Body Control Module programming then performs those tasks and provides features through both CAN Bus com-
munication with other electronic modules and hardwired outputs to a number of relays. These relays provide the
Body Control Module with the ability to control numerous high current accessory systems in the vehicle.

The Body Control Module circuitry operates on battery current received through fuses in the Underhood Accessory
Fuse Block on a non-switched fused B(+) circuit, a fused ignition switch output (start-on/run) circuit, and a fused
ignition switch output (start-on/run-accessory) circuit. This arrangement allows the Body Control Module to provide
some features regardless of the ignition switch position. The Body Control Module circuitry is grounded through the
chassis behind the right side lower A-pillar kick panel.

The Body Control Module monitors its own internal circuitry as well as many of its input and output circuits and will
store a Diagnostic Trouble Code (DTC) in electronic memory for any failure it detects. These DTCs can be retrieved
and diagnosed using a DRB III

scan tool. Refer to the appropriate diagnostic information.

8E - 102

ELECTRONIC CONTROL MODULES - SERVICE INFORMATION

REMOVAL

1. Disconnect the negative battery cable (2).

2. Slide the clips forward to remove the plastic control

module box cover (1).

3. Holding the metal body control module retaining

clip (1) back, pull the body control module up and
out of the control module box.

ELECTRONIC CONTROL MODULES - SERVICE INFORMATION

8E - 103

4. Disconnect the electrical connectors (1) by first

sliding the grey windshield wiper connector lock to
the right and removing the windshield wiper electri-
cal connector. Then, pull the metal body control
module connector lock up to unlock and disconnect
the rest of the body control module electrical con-
nectors.

5. Remove the body control module from the control

module box (2).

REMOVAL - RHD

1. Disconnect the negative battery cable.

2. Slide the clips forward to remove the plastic control module box cover (1).

3. Holding the metal body control module retaining clip back, pull the body control module (6) up and out of the

control module box (5).

8E - 104

ELECTRONIC CONTROL MODULES - SERVICE INFORMATION

Content .. 179 180 181 182 ..