Chrysler 300M, Dodge Interpid. Manual — part 63
OPERATION
The primary functions of the controller antilock
brake (CAB) are to:
• Monitor the antilock brake system for proper
operation.
• Detect wheel locking or wheel slipping tenden-
cies by monitoring the speed of all four wheels of the
vehicle.
• Control fluid modulation to the wheel brakes
while the system is in an ABS mode.
• Store diagnostic information.
• Provide communication to the DRBIIIt scan tool
while in diagnostic mode.
• Illuminate the ABS and BRAKE (with loss of
EVBP) warning indicator lamps.
• (With traction control only) Illuminate the TRAC
ON lamp in the message center on the instrument
panel when a traction control event occurs.
• (with traction control only) Illuminate the TRAC
OFF lamp when the amber ABS warning indicator
lamp illuminates.
The CAB constantly monitors the antilock brake
system for proper operation. If the CAB detects a
fault, it will turn on the amber ABS warning indica-
tor lamp and disable the antilock braking system.
The normal base braking system will remain opera-
tional.
NOTE: If the vehicle is equipped with traction con-
trol, the TRAC OFF lamp will illuminate anytime the
amber ABS warning indicator lamp illuminates.
The CAB continuously monitors the speed of each
wheel through the signals generated by the wheel
speed sensors to determine if any wheel is beginning
to lock. When a wheel locking tendency is detected,
the CAB commands the CAB command coils to actu-
ate. The coils then open and close the valves in the
HCU that modulate brake fluid pressure in some or
all of the hydraulic circuits. The CAB continues to
control pressure in individual hydraulic circuits until
a locking tendency is no longer present.
The CAB contains a self-diagnostic program that
monitors the antilock brake system for system faults.
When a fault is detected, the amber ABS warning
indicator lamp is turned on and the fault diagnostic
trouble code (DTC) is then stored in a diagnostic pro-
gram memory. These DTC’s will remain in the CAB
memory even after the ignition has been turned off.
The DTC’s can be read and cleared from the CAB
memory by a technician using the DRBIII
t scan tool.
If not cleared with a DRBIII
t scan tool, the DTC will
be automatically cleared from the CAB memory after
the identical fault has not been seen during the next
3,500 miles.
CAB INPUTS
• Wheel speed sensors (four)
• Brake lamp switch
• Ignition switch
• System and pump voltage
• Ground
• Traction control OFF switch (via BUS) (if
equipped)
• Diagnostic communication (PCI)
CAB OUTPUTS
• Amber ABS warning indicator lamp actuation
(via BUS)
• Instrument cluster (MIC) communication (PCI)
• Traction control lamps (if equipped)
• Diagnostic communication (PCI, via BUS)
REMOVAL
To remove the CAB, the ICU must be removed
from the vehicle and disassembled. (Refer to 5 -
BRAKES
-
ABS/HYDRAULIC/MECHANICAL/ICU
(INTEGRATED CONTROL UNIT) - REMOVAL)
INSTALLATION
To install the CAB, it must be attached to the
HCU, forming the ICU. (Refer to 5 - BRAKES - ABS/
HYDRAULIC/MECHANICAL/ICU
(INTEGRATED
CONTROL UNIT) - ASSEMBLY)
DATA LINK CONNECTOR
DESCRIPTION
The data link connector is located inside the vehi-
cle, below instrument panel next to the center col-
umn (Fig. 2).
Fig. 2 DATA LINK CONNECTOR
LH
ELECTRONIC CONTROL MODULES
8E - 5
CONTROLLER ANTILOCK BRAKE (Continued)
OPERATION
The data link connector (diagnostic connector)
links the DRB scan tool with the Powertrain Control
Module (PCM). Refer to On-Board Diagnostics in the
General Diagnosis section of this group.
MEMORY HEATED SEAT/
MIRROR MODULE
DESCRIPTION
A Memory Heated Seat/Mirror Module (MHSMM) is
used on vehicles that are equipped with the heated
seat system option. The module is used to control all of
the driver side seat/mirror memory functions and both
the driver and passenger heated seat functions. The
memory heated seat/mirror module contains a central
processing unit and interfaces with the Programmable
Communications Interface (PCI) data bus network.
Refer to the Heated Seats section of this manual for
more information on the heated seat system.
The module is packaged in a black molded plastic
case which is mounted under the forward edge of the
driver side front seat cushion (Fig. 3). This location
makes it somewhat difficult to remove because it sits
between the power seat track and the seat cushion
frame. However, it can be removed without having to
remove the drivers seat, refer to the procedure in
this section for detailed instructions.
For diagnosis of the MHSMM or the PCI data bus,
a DRB III
t scan tool and the Service/Diagnostic Pro-
cedures manual are recommended. The Memory
Heated Seat/Mirror Module cannot be adjusted or
repaired and, if faulty or damaged, it must be
replaced.
OPERATION
The Memory Heated Seat/Mirror Module controls
the heated seat and memory seat, mirror systems.
However different, these two systems share some
software programmed into the module. Refer to the
following text which explains how the two different
systems are controlled by the memory heated seat/
mirror module.
HEATED SEAT SYSTEM OPERATION
The Memory Heated Seat/Mirror Module receives
hard wired inputs from the heated seat switches and
the heated seat sensors located, on each of the front
seats. The programmed software in the MHSMM
allows it to know the temperature of the seat by a
resistance reading generated from the seat cushion
element mounted thermistor (Heated Seat Tempera-
ture Sensor). When a heated seat switch is depressed
the module will power the appropriate heating ele-
ment
until
the
correct
preset
temperature
is
achieved. Refer to heated seat switch, element and
sensor descriptions for additional information.
MEMORY SEAT/MIRROR SYSTEM OPERATION
The Memory Heated Seat/Mirror Module receives
hard wired inputs from the memory seat switch and
the potentiometers, mounted on each of the driver
power seat track motors and both side view mirrors.
The programmed software in the MHSMM allows it
to know where the seat/mirror is located in its
designed travel by a resistance reading generated
from the seat track or mirror mounted potentiometer.
This way, when the memory switch is depressed the
module will power the seat track or mirror motors
until the correct preset location is achieved. The
MHSMM will prevent the seat memory recall func-
tion from being initiated if the transmission gear
selector lever is not in the Park or Neutral positions,
or if the vehicle is moving. These inputs are moni-
tored over the PCI data bus circuit.
DIAGNOSIS AND TESTING - MEMORY HEATED
SEAT/MIRROR MODULE
In order to obtain conclusive testing of the memory
heated seat/mirror module, the Programmable Com-
munications Interface (PCI) data bus circuit and any
components that provide inputs to the module must
be checked.
Fig. 3 Memory Heated Seat/Mirror Module (MHSMM)
Location
1 - MEMORY HEATED SEAT/MIRROR MODULE
2 - RECLINER MOTOR
3 - SEAT HEATER 4–WAY CONNECTOR
4 - SEAT BACK HEATER 2–WAY CONNECTOR
5 - REAR RISER
6 - FRONT RISER
7 - HORIZONTAL MOTOR
8E - 6
ELECTRONIC CONTROL MODULES
LH
DATA LINK CONNECTOR (Continued)
The most reliable, efficient, and accurate means to
diagnose the module requires the use of a DRB III
t
scan tool and the Service and Body Diagnostic Proce-
dures Manuals. The DRB III
t scan tool can provide
vital information to the technician trying to find a
problem with the module. Diagnostic logic software is
built into the memory heated seat/mirror module to
help the person trying to locate the problem by the
most efficient means possible. Anytime a problem is
suspected, a DRB III
t scan tool should be obtained
and used to retrieve any stored fault codes in the
memory heated seat/mirror module. If diagnostic fault
codes are present in the module, record them on a
piece of paper immediately before proceeding any fur-
ther. Then, use these fault codes to identify the prob-
lem by verifying the fault code. Example, If the module
records “DRIVER SEAT HEAT OUTPUT OPEN” fault,
locate the diagnostic procedure for this code in the
appropriate Body Diagnostic Procedures Manual and
follow the flow chart until the specific problem is
located and resolved. Once the problem is corrected,
erase the stored fault code using the DRB III
t scan
tool and verify correct heated seat system operation. If
the heated seat system appears to be functioning cor-
rectly, verify that there are no other stored codes in
the module and return the vehicle to service.
If the fault code could not be verified, such as not
finding anything wrong when following the diagnostic
flow chart in the Body Diagnostic Procedures Manual.
This is a good indication that a INTERMITTENT prob-
lem may be present. You must than attempt to find the
intermittent problem, such as moving the heating ele-
ment within the seat while testing continuity or wig-
gling the wire harness’s/electrical connectors under the
seat while testing continuity. Always, eliminate all
other potential problems before attempting to replace
the memory heated seat module.
For complete circuit wiring diagrams, refer to Wir-
ing.
WARNING: REFER TO THE RESTRAINTS SECTION
OF THIS MANUAL BEFORE ATTEMPTING ANY SEAT,
STEERING
WHEEL,
STEERING
COLUMN,
OR
INSTRUMENT PANEL COMPONENT DIAGNOSIS OR
SERVICE. FAILURE TO TAKE THE PROPER PRECAU-
TIONS COULD RESULT IN ACCIDENTAL AIRBAG
DEPLOYMENT AND POSSIBLE PERSONAL INJURY.
PRELIMINARY TEST
Before testing the individual components in the
heated seat system, check the following:
(1) Using the DRB III
t scan tool, check the mem-
ory heated seat/mirror module (MHSMM) for any
stored fault codes. Record these codes on paper for
reference and resolve using the appropriate Body
Diagnostic Procedures Manual.
(2) Check the vehicles battery open-circuit voltage
and charging system performance. If the vehicles elec-
trical system is defective or weak it may not be suppling
sufficient energy to operate the system in question.
(3) Test each of the circuits from the heated seat
switch, elements, and sensors to the MHSMM.
Repair any shorts or open circuits as required.
REMOVAL
(1) Position the drivers seat as far upward and
rearward as possible.
(2) Open hood, disconnect and isolate the negative
battery cable remote terminal from the remote bat-
tery post.
WARNING: SOME VEHICLES ARE EQUIPPED WITH
SEATBACK
MOUNTED
AIRBAGS.
BEFORE
ATTEMPTING TO DIAGNOSE OR SERVICE ANY
SEAT OR POWER SEAT SYSTEM COMPONENT
YOU MUST FIRST DISCONNECT AND ISOLATE THE
BATTERY NEGATIVE CABLE. THEN WAIT TWO MIN-
UTES FOR THE SYSTEM CAPACITOR TO DIS-
CHARGE BEFORE FURTHER SYSTEM SERVICE.
THIS IS THE ONLY SURE WAY TO DISABLE THE
AIRBAG SYSTEM. FAILURE TO DO SO COULD
RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT
AND POSSIBLE PERSONAL INJURY.
(3) Remove the two module attaching screws (Fig. 4).
Fig. 4 Memory Heated Seat/Mirror Module (MHSMM)
Location
1 - MEMORY HEATED SEAT MIRROR MODULE
2 - RECLINER MOTOR
3 - SEAT HEATER 4–WAY CONNECTOR
4 - SEAT BACK HEATER 2–WAY CONNECTOR
5 - REAR RISER MOTOR
6 - FRONT RISER MOTOR
7 - HORIZONTAL MOTOR
LH
ELECTRONIC CONTROL MODULES
8E - 7
MEMORY HEATED SEAT/MIRROR MODULE (Continued)
(4) Disconnect the module electrical connectors.
(5) Remove the module from drivers seat.
INSTALLATION
(1) Position the module under the drivers seat.
(2) Connect the module electrical connectors.
(3) Install the two module attaching screws.
(4) Connect the negative battery cable remote ter-
minal.
(5) Position the drivers seat in its original position.
(6) Verify correct system operation.
POWERTRAIN CONTROL
MODULE
DESCRIPTION
DESCRIPTION
The Powertrain Control Module (PCM) is a digital
computer containing a microprocessor (Fig. 5). The
PCM receives input signals from various switches
and sensors referred to as Powertrain Control Mod-
ule Inputs. Based on these inputs, the PCM adjusts
various engine, transmission, and vehicle operations
through devices referred to as Powertrain Control
Module Outputs.
NOTE: PCM Inputs:
• Air Conditioning Pressure Transducer
• ASD Relay
• Battery Voltage
• Brake Switch Status
• Camshaft Position Sensor
• Crankshaft Position Sensor
• Distance Sensor
• EGR Position Feedback
• Engine Coolant Temperature Sensor
• Heated Oxygen Sensors
• Ignition sense
• Intake Air Temperature Sensor
• Knock Sensor
• Manifold Absolute Pressure (MAP) Sensor
• Natural Vacuum Leak Detection
• PCI Bus
• Power Steering Pressure Switch
• Proportional Purge Sense
• SCI Receive
• Speed Control
• Throttle Position Sensor
• Torque Management Input (Integral to PCM)
• Transmission Control Relay (Switched B+)
• Transmission Range Sensor (TRS)
• Transmission Pressure Switches (L/R, 2/4, OD)
• Transmission Temperature Sensor (Integral to
TRS)
• Transmission Input Shaft Speed Sensor
• Transmission Output Shaft Speed Sensor
• TRS Hall Effect Switch (Autostick)
• Vehicle Speed (From Transmission)
NOTE: PCM Outputs:
• Air Conditioning Clutch Relay
• Automatic Shut Down (ASD) and Fuel Pump
Relays
• Data Link Connector (PCI and SCI Transmit)
• Double Start Override
• EGR Solenoid
• Fuel Injectors
• Generator Field
• High Speed Fan Relay
• Idle Air Control Motor
• Ignition Coils
• Low Speed Fan Relay
• MTV Actuator
• Natural Vacuum Leak Detection
• Proportional Purge Solenoid
• SRV Valve
Fig. 5 Powertrain Control Module (PCM)
1 - PDC
2 - SPEED CONTROL SERVO
3 - POWERTRAIN CONTROL MODULE
8E - 8
ELECTRONIC CONTROL MODULES
LH
MEMORY HEATED SEAT/MIRROR MODULE (Continued)
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст