Chrysler PT Cruiser. Manual — part 472
• system relay voltage
• ground
• traction control lamp actuation (if equipped)
• diagnostic communication (PCI)
CONTROLLER ANTILOCK BRAKE OUTPUTS
• amber ABS warning indicator lamp actuation
(through MIC)
• red BRAKE warning indicator lamp actuation
(through MIC)
• traction control lamp (if equipped)
• diagnostic communication. (PCI)
REMOVAL
(1) Disconnect battery negative cable.
(2) Raise vehicle. (Refer to LUBRICATION &
MAINTENANCE/HOISTING - STANDARD PROCE-
DURE)
(3) Disconnect pump/motor connector from CAB
(Fig. 4).
(4) Remove four screws securing CAB to HCU half
of ICU (Fig. 4). Remove CAB from HCU.
(5) Pull outward on CAB connector lock and dis-
connect 24–way wiring connector. Remove CAB from
vehicle.
INSTALLATION
(1) Connect 24–way wiring connector to CAB and
push in connector lock.
(2) Align CAB with HCU half of ICU, then slide
CAB up over HCU valves. Install four CAB mounting
screws (Fig. 4). Tighten mounting screws to 2 N·m
(17 in. lbs.) torque.
(3) Connect pump/motor connector (Fig. 4).
(4) Lower vehicle.
(5) Connect battery negative cable.
(6) Connect DRBIII
t to vehicle to initialize system.
Check and clear any faults.
DATA LINK CONNECTOR
DESCRIPTION
The data link connector is located inside the vehi-
cle, below instrument panel next to the center col-
umn (Fig. 5).
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.
Fig. 4 CAB Mounting
1 - PUMP/MOTOR CONNECTOR
2 - CAB MOUNTING SCREWS
Fig. 5 DATA LINK CONNECTOR
8E - 4
ELECTRONIC CONTROL MODULES
PT
CONTROLLER ANTILOCK BRAKE (MK20E) (Continued)
HEATED SEAT MODULE
DESCRIPTION
One heated seat module is used per vehicle to con-
trol both front heated seats. The heated seat module
(Fig. 6) is located on the driver seat cushion pan,
where it is secured with two push-pin type plastic
fasteners. The module is encased within a small,
rectangular, molded plastic housing with a single
connector receptacle that allows it to be connected to
all of the required inputs and outputs through the
power seat wire harness.
The heated seat module is an electronic micropro-
cessor designed to monitor inputs and control the
outputs of the heated seat system. The heated seat
module is programmed to provide two levels of heat-
ing for each front seat. The Low temperature set
point is about 36° C (97° F) and the High tempera-
ture set point is about 41° C (105° F). The heated
seat module is also programmed to perform self-diag-
nosis. If the module detects a shorted or open heating
element or a Negative Temperature Coefficient (NTC)
heated seat sensor out of range the module will flash
the heated seat switch LED’s, to indicate that a prob-
lem exists with the heated seat system. (Refer to 8 -
ELECTRICAL/ELECTRONIC
CONTROL
MOD-
ULES/MEMORY
HEATED
SEAT/MIRROR
MOD-
ULE - DIAGNOSIS AND TESTING) for additional
information.
The heated seat module cannot be adjusted or
repaired. If a module is damaged or inoperative, the
entire module must be replaced.
OPERATION
The heated seat module operates on battery cur-
rent received through a fuse in the Junction Block
(JB) on a fused ignition switch output (run-acc) cir-
cuit. The heated seat system will only operate when
the ignition switch is in the On or Accessory posi-
tions. The heated seat module is grounded at all
times through a two wire take out and eyelet termi-
nal secured by a ground screw to the top of the seat
crossmember under each front seat.
Inputs to the heated seat module include:
• A heated seat switch MUX circuit for each of the
two heated seat switches
• Heated seat sensor inputs from the seat cush-
ions of each front seats
• Battery current from the power seat circuit
breaker in the JB received through the energized
heated seat relay on two heated seat relay output cir-
cuits
Outputs from the heated seat module include:
• A battery voltage reference to the heated seat
sensors on a sensor feed circuit
• A battery current feed to the two heated seat
element circuits on separate heated seat driver cir-
cuits
• Separate Lo and Hi driver circuits for each of
the heated seat switch Light-Emitting Diode (LED)
indicator lamps
When a driver or passenger heated seat switch
request signal is received by the heated seat module,
the module energizes the proper switch LED indica-
tor lamp (Lo or Hi) by pulling the LED driver circuit
to ground. At the same time, the heated seat module
energizes the heated seat sensor feed circuit and the
sensor provides the module with a heat sense input
indicating the surface temperature of the selected
seat cushion. If the seat cushion surface temperature
input is below the temperature set point for the
selected heat mode, the heated seat module energizes
an N-channel Field Effect Transistor (N-FET) within
the module. The N-FET switches battery current to
the heated seat elements in the selected seat cushion
and back. When the heated seat sensor input indi-
cates the correct temperature set point has been
achieved, the heated seat module de-energizes the
N-FET which switches off the battery current to the
heated seat elements. The heated seat module will
continue to cycle the N-FET as needed to maintain
the selected temperature set point.
If the heated seat module detects a heated seat
sensor value input that is out of range or a shorted
or open heated seat element circuit, it will automat-
Fig. 6 Heated Seat Module Location - Typical
1 - SEAT CUSHION FRAME
2 - HEATED SEAT MODULE
3 - WIRE HARNESS CONNECTOR
4 - POWER SEAT TRACK FRONT BRACKET
PT
ELECTRONIC CONTROL MODULES
8E - 5
ically de-energize the N-FET and switch off the bat-
tery current to the affected heated seat elements.
The heated seat module will also indicate this condi-
tion by flashing the Hi and/or Lo LED lamps in the
affected heated seat switch in a prescribed sequence
as a self-diagnostic feedback.
DIAGNOSIS AND TESTING - HEATED SEAT
MODULE
Refer to the appropriate wiring diagrams
information. The wiring information includes wir-
ing diagrams, proper wire and connector repair pro-
cedures, further details on wire harness routing and
retention, as well as pin-out and location views for
the various wire harness connectors, splices and
grounds.
(1) If a heated seat fails to heat and one or both of
the LED indicator lamps on a heated seat switch
flash, (Refer to 8 - ELECTRICAL/HEATED SEATS -
DIAGNOSIS AND TESTING).
(2) Test the appropriate Heated Seat Switch,
(Refer
to
8
-
ELECTRICAL/HEATED
SEATS/
DRIVER HEATED SEAT SWITCH - DIAGNOSIS
AND TESTING).
(3) Test the Heated Seat Sensor, (Refer to 8 -
ELECTRICAL/HEATED
SEATS/HEATED
SEAT
SENSOR - DIAGNOSIS AND TESTING).
(4) Test the Heated Seat Element, (Refer to 8 -
ELECTRICAL/HEATED
SEATS/HEATED
SEAT
ELEMENT - DIAGNOSIS AND TESTING).
(5) Disconnect the heated seat module connector
receptacle. Using an ohmmeter, check for continuity
between the ground circuit cavity and a good
ground. If OK, go to Step 6. If not OK, repair the
open ground circuit to ground as required.
(6) Place the ignition key in the RUN position.
Using a voltmeter, check for voltage on the B+ cir-
cuit cavity. If OK, go to Step 7. If not OK, repair the
open B+ circuit as required.
(7) Using an ohmmeter, check for continuity on the
individual circuits between the heated seat module
and the inoperative heated seat switch and elements.
If OK, replace the heated seat module, (Refer to 8 -
ELECTRICAL/ELECTRONIC
CONTROL
MOD-
ULES/MEMORY
HEATED
SEAT/MIRROR
MOD-
ULE - REMOVAL). If not OK, repair the open or
shorted circuit between the heated seat module and
the inoperative heated seat switch and elements as
necessary.
REMOVAL
WARNING:
THERE ARE
MANY
SHARP
METAL
EDGES ON THE SEAT CUSHION FRAME AND SEAT
ADJUSTER RAILS UNDER THE SEAT. WHEN PER-
FORMING THIS SERVICE, A LONG-SLEEVED SHIRT
AND GLOVES SHOULD BE WORN IN ORDER TO
AVOID UNNECESSARY CUTS AND ABRASIONS TO
EXPOSED SKIN.
(1) Move the driver power seat to its full up and
full rear stop positions.
(2) Disconnect and isolate the battery negative
cable.
(3) Working under the seat, release the two plastic
push-in fasteners from either the module or the
mounting holes in the power seat cushion pan (Fig.
7).
(4) Disconnect the power seat wire harness connec-
tor from the heated seat module connector receptacle.
(5) Remove the heated seat module from the power
seat track.
INSTALLATION
(1) If the two plastic push-in fasteners for the
heated seat module were damaged during removal,
install new fasteners onto the heated seat module.
(2) Reconnect the power seat wire harness connec-
tor to the heated seat module connector receptacle.
Be certain that the cavities in the power seat wire
harness connector are aligned with the terminals in
the heated seat module connector receptacle before
pushing the connector firmly into place.
(3) Install the heated seat module on the power
seat cushion pan.
(4) Reconnect the battery negative cable.
Fig. 7 Heated Seat Module Location- Typical
1 - SEAT CUSHION FRAME
2 - HEATED SEAT MODULE
3 - WIRE HARNESS CONNECTOR
4 - POWER SEAT TRACK FRONT BRACKET
8E - 6
ELECTRONIC CONTROL MODULES
PT
HEATED SEAT MODULE (Continued)
POWERTRAIN CONTROL
MODULE
DESCRIPTION
OPERATION - SENSOR RETURN - PCM INPUT
The sensor return circuit provides a low electrical
noise ground reference for all of the systems sensors.
The sensor return circuit connects to internal ground
circuits
within
the
Powertrain
Control
Module
(PCM).
DATA BUS COMMUNICATION RECEIVE - PCM
INPUT
The PCM uses the SCI communication bus to pre-
form engine diagnostics and flash operations. The
transmission side of the PCM uses the SCI commu-
nication bus to flash new software. However, diagnos-
tics is performed via the vehicles J1850 bus for the
transmission side of the PCM.
OPERATION - IGNITION SENSE - PCM INPUT
The ignition sense input informs the Powertrain
Control Module (PCM) that the ignition switch is in
the crank or run position.
PCM GROUND
Ground is provided through multiple pins of the
PCM connector. Depending on the vehicle there may
be as many as two different ground pins. There are
power grounds and sensor grounds.
The power grounds are used to control the ground
side relays, solenoids, ignition coil or injectors. The
signal ground is used for any input that uses sensor
return for ground, and the ground side of any inter-
nal processing component.
The PCM case is shielded to prevent RFI and EMI.
The PCM case is grounded and must be firmly
attached to a good, clean body ground.
Internally all grounds are connected together, how-
ever there is noise suppression on the sensor ground.
For EMI and RFI protection the housing and cover
are also grounded separately from the ground pins.
OPERATION
OPERATION
The PCM receives input signals from various
switches and sensors that are referred to as PCM
Inputs. Based on these inputs, the PCM adjusts var-
ious engine, transmission, and vehicle operations
through devices that are referred to as PCM Outputs
(Fig. 8).
NOTE: PCM Inputs:
• Air Conditioning Controls
• Ambient Air temperature Sensor
• ASD Sense
• Baro/Tip (Turbo)
• Battery Voltage
• Battery Temperature Sensor
• Brake Switch
• Camshaft Position Sensor
• Clutch Upstop Switch
• Clutch Interlock
• Crankshaft Position Sensor
• Engine Coolant Temperature Sensor
• Fuel Level Sensor (Bus message)
• Ignition Switch
• Intake Air Temperature Sensor
• J1850
• Knock Sensor (2.0, 2.4L)
• Natural Vacuum Leak Detection (NVLD)
• Manifold Absolute Pressure (MAP) Sensor
• Oil Pressure Switch
• Oxygen Sensors
• Power Steering Pressure Switch
• SCI Receive
• Speed Control Switches
• Throttle Position Sensor
• Transmission Control Relay (Switched B+)
• Transmission Input Shaft Speed Sensor
• Transmission Output Shaft Speed Sensor
• Transmission Pressure Switches (L/R, 2/4, OD)
• Transmission Range Sensor (TRS)
• Transmission Oil Temperature Sensor (Integral
to TRS)
• Vehicle Speed Sensor (MTX-equipped models)
Fig. 8 PCM
PT
ELECTRONIC CONTROL MODULES
8E - 7
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