2001 CHRYSLER VOYAGER sensor

TABLE OF CONTENTS - Continued
8.4.2ACTUATOR ± FRONT RHD................................997
8.4.3ACTUATOR ± FRONT LHD................................997
8.4.4ACTUATOR ± FRONT RHD................................998
8.4.5EVAPORATOR TEMPERATURE SENSOR LHD................998
8.4.6EVAPORATOR TEMPERATURE SENSOR RHD...............999
8.4.7C202 CONNECTOR......................................999
8.4.8ACTUATORS ± REAR...................................1000
8.4.9REAR A/C HEATER UNIT CONNECTOR....................1000
8.5CABIN HEATER.................................................1001
8.5.1DIESEL CABIN HEATER ASSIST (CABIN HEATER) ASSEMBLY .1001
8.5.2C331 CONNECTOR.....................................1001
8.5.3C330 CONNECTOR.....................................1002
8.7MEMORY SYSTEM...............................................1002
8.7.1MEMORY SEAT MIRROR MEDULE/SEAT MOTORS..........1002
8.7.2MEMORY SEAT MIRROR MODULE CIRCUIT BREAKER.......1003
8.8OVERHEAD SWITCHES..........................................1003
8.9POWER FOLDING MIRRORS......................................1003
8.10POWER LIFTGATE SYSTEM.......................................1004
8.10.1MODULE..............................................1004
8.10.2PINCH SENSORS (TAPE SWITCH)........................1004
8.10.3LATCH ASSEMBLY......................................1005
8.11POWER DOOR LOCK/RKE SYSTEM................................1005
8.11.1DOOR LOCK MOTOR/AJAR SWITCH......................1005
8.11.1CYLINDER LOCK SWITCH...............................1005
8.11.3REMOTE KEYLESS ENTRY MODULE......................1006
8.12POWER SLIDING DOOR..........................................1006
8.12.1MODULE..............................................1006
8.12.2LOWER DRIVE UNIT....................................1006
8.12.3LATCH ASSEMBLY......................................1007
8.13VEHICLE THEFT SECURITY SYSTEM...............................1007
8.13.1RKE/THATCHAM ALARM MODULE........................1007
8.13.2RKE/THATCHAM ALARM MODULE CONNECTORS...........1007
8.13.3VTSS LED.............................................1008
8.13.4VTSS SIREN...........................................1008
8.13.5FRONT INTRUSION SENSOR.............................1009
8.13.6REAR INTRUSION SENSOR.............................1009
9.0 CONNECTOR PINOUTS...............................................1011
A/C-HEATER CONTROL C1 (MTC) - BLACK/RED 20 WAY...................1011
A/C-HEATER CONTROL C2 (MTC) - BLACK/BLUE 10 WAY..................1011
AMBIENT TEMP SENSOR (EXCEPT BASE) - BLACK 2 WAY.................1011
ATC REMOTE SENSOR (ATC)-4WAY...................................1012
AUTO TEMP CONTROL C1 - WHITE 13 WAY..............................1012
AUTO TEMP CONTROL C2 - BLACK 13 WAY..............................1012
AUTO TEMP CONTROL C3-4WAY.....................................1012
BLOWER MOTOR RESISTOR C1 (MTC) - BLACK 6 WAY....................1013
BLOWER MOTOR RESISTOR C2 (MTC) - BLACK 2 WAY....................1013
BODY CONTROL MODULE C1 - BLACK/BLACK 6 WAY.....................1013
BODY CONTROL MODULE C2 - BLACK/GREEN 34 WAY....................1014
BODY CONTROL MODULE C3 - BLACK/WHITE 34 WAY....................1015
BODY CONTROL MODULE C4 - BLACK/GRAY 34 WAY.....................1016
BODY CONTROL MODULE C5 - BLACK/BLACK 34 WAY....................1017
xix

TABLE OF CONTENTS - Continued
DIAGNOSTIC JUNCTION PORT - BLACK 16 WAY..........................1036
DOSING PUMP - BLACK 2 WAY.........................................1036
DRIVER AIRBAG C1 - BROWN 2 WAY....................................1036
DRIVER AIRBAG C2 - BLACK 2 WAY.....................................1036
DRIVER BLEND DOOR ACTUATOR (ATC) - GRAY 2 WAY...................1037
DRIVER BLEND DOOR ACTUATOR (MTC) - GRAY 2 WAY...................1037
DRIVER DOOR LOCK SWITCH - BLACK 3 WAY...........................1037
DRIVER SEAT BELT SWITCH - WHITE 2 WAY.............................1037
DRIVER SEAT BELT TENSIONER-2WAY................................1038
ELECTRIC WIPER DE-ICER C1 - WHITE 2 WAY...........................1038
ELECTRIC WIPER DE-ICER C2 - WHITE 2 WAY...........................1038
ENGINE CONTROL MODULE C1 (DIESEL) - BLACK 81 WAY.................1039
ENGINE CONTROL MODULE C2 (DIESEL) - BLACK 40 WAY.................1041
EVAPORATOR TEMPERATURE SENSOR - BLACK 2 WAY...................1041
FRONT BLOWER MODULE C1 (ATC) - BLACK 4 WAY......................1042
FRONT BLOWER MODULE C2 (ATC) - BLACK 2 WAY......................1042
FRONT READING LAMPS/SWITCH - BLACK 6 WAY........................1042
GLOVE BOX LAMP - BLUE 2 WAY.......................................1042
HALO LAMP - BLUE 2 WAY.............................................1042
HEADLAMP SWITCH - BLACK 13 WAY...................................1043
HEADLAMP WASHER PUMP MOTOR (BUILT-UP-EXPORT) - BLACK 2 WAY. . . .1043
IGNITION SWITCH - BLACK 5 WAY......................................1043
INSTRUMENT CLUSTER - BLACK 13 WAY................................1044
INTELLIGENT POWER MODULE C1 - LT. GREEN/RED 20 WAY..............1044
INTELLIGENT POWER MODULE C2 - GREEN/BLUE 10 WAY................1045
INTELLIGENT POWER MODULE C3 (DIESEL) - YELLOW/RED 20 WAY........1045
INTELLIGENT POWER MODULE C3 (GAS) - NATURAL/RED 20 WAY..........1046
INTELLIGENT POWER MODULE C4 - BLUE 10 WAY.......................1046
INTELLIGENT POWER MODULE C5 - BLACK 4 WAY.......................1046
INTELLIGENT POWER MODULE C6 - NATURAL 10 WAY....................1047
INTELLIGENT POWER MODULE C7 - BLACK/RED 20 WAY..................1047
INTELLIGENT POWER MODULE C8 - ORANGE 10 WAY....................1048
INTELLIGENT POWER MODULE C9 - BLACK 10 WAY......................1048
LEFT B-PILLAR SWITCH - GRAY 3 WAY..................................1048
LEFT CINCH/RELEASE MOTOR (POWER SLIDING DOOR) - GRAY 4 WAY.....1048
LEFT CYLINDER LOCK SWITCH - BLACK 2 WAY..........................1049
LEFT DOOR SPEAKER - BLACK/RED 6 WAY..............................1049
LEFT FOG LAMP - WHITE 2 WAY.......................................1049
LEFT FRONT DOOR AJAR SWITCH (BASE) - BLACK 2 WAY.................1049
LEFT FRONT DOOR LOCK MOTOR/AJAR SWITCH (EXCEPT BASE) -
BLACK 4 WAY........................................................1050
LEFT FRONT PARK/TURN SIGNAL LAMP (EXCEPT BUILT-UP-EXPORT) -
BLACK 3 WAY........................................................1050
LEFT FULL OPEN SWITCH (POWER SLIDING DOOR) - BLACK 2 WAY........1050
LEFT HEADLAMP (EXCEPT BUILT-UP-EXPORT) - BLACK 3 WAY.............1050
LEFT HIGH BEAM LAMP (BUILT-UP-EXPORT) - BLACK 2 WAY...............1051
LEFT INSTRUMENT PANEL SPEAKER - BLACK 2 WAY.....................1051
LEFT LOW BEAM LAMP (BUILT-UP-EXPORT) - BLACK 2 WAY...............1051
LEFT PARK LAMP (BUILT-UP-EXPORT) - BLACK 2 WAY....................1051
LEFT POWER MIRROR - BLACK 12 WAY.................................1052
LEFT REAR PILLAR SPEAKER - BLACK 2 WAY............................1052
LEFT REAR READING LAMP (LUXURY) - GRAY 3 WAY.....................1052
LEFT REAR SPEAKER - BLACK/RED 6 WAY..............................1052
xxi

TABLE OF CONTENTS - Continued
LEFT REMOTE RADIO SWITCH - BLACK 2 WAY...........................1053
LEFT SEAT AIRBAG - YELLOW 2 WAY...................................1053
LEFT SIDE IMPACT AIRBAG CONTROL MODULE - YELLOW/RED 7 WAY......1053
LEFT SLIDING DOOR CONTROL MODULE C1 (POWER SLIDING DOOR) -
BLACK 8 WAY........................................................1053
LEFT SLIDING DOOR CONTROL MODULE C2 (POWER SLIDING DOOR) -
BLACK/RED 20 WAY..................................................1054
LEFT SLIDING DOOR LATCH SENSING SWITCH (POWER SLIDING DOOR) -
BLACK 6 WAY........................................................1054
LEFT SLIDING DOOR LOCK MOTOR (POWER SLIDING DOOR) - BLACK 4
WAY................................................................1054
LEFT SLIDING DOOR LOCK MOTOR/AJAR SWITCH (MANUAL
SLIDING DOOR) - BLACK 4 WAY........................................1055
LEFT SLIDING DOOR MOTOR (POWER SLIDING DOOR) - BLACK 8 WAY.....1055
LEFT STOP/TURN SIGNAL RELAY (TRAILER TOW) - BLACK 5 WAY..........1055
LEFT VISOR/VANITY LAMP (PREMIUM/LUXURY) - BLACK 2 WAY............1055
LICENSE LAMP (POWER LIFTGATE) - DK. GRAY 8 WAY....................1056
LICENSE LAMP (POWER RELEASE) - DK. GRAY 4 WAY....................1056
LIFTGATE AJAR SWITCH (MANUAL RELEASE) - BLACK 2 WAY..............1056
LIFTGATE AJAR SWITCH (POWER RELEASE) - BLACK 4 WAY..............1056
LIFTGATE CINCH/RELEASE MOTOR (POWER LIFTGATE) - BLUE 7 WAY......1057
LIFTGATE CYLINDER LOCK SWITCH - BLACK 2 WAY......................1057
LIFTGATE LEFT PINCH SENSOR (POWER LIFTGATE) - BLACK 2 WAY........1057
LIFTGATE RIGHT PINCH SENSOR (POWER LIFTGATE) - BLACK 2 WAY......1057
MEMORY POWER SEAT SWITCH - GREEN 10 WAY........................1058
MEMORY SEAT FRONT VERTICAL MOTOR - RED 2 WAY...................1058
MEMORY SEAT FRONT VERTICAL POSITION SENSOR - BLACK 3 WAY......1058
MEMORY SEAT HORIZONTAL MOTOR - BLACK 2 WAY.....................1058
MEMORY SEAT HORIZONTAL POSITION SENSOR - BLACK 3 WAY...........1058
MEMORY SEAT REAR VERTICAL MOTOR - RED 2 WAY....................1059
MEMORY SEAT REAR VERTICAL POSITION SENSOR - BLACK 3 WAY........1059
MEMORY SEAT RECLINER MOTOR - GREEN 2 WAY.......................1059
MEMORY SEAT RECLINER POSITION SENSOR - BLACK 3 WAY.............1059
MEMORY SEAT SWITCH - BLACK 2 WAY.................................1059
MEMORY SEAT/MIRROR MODULE C1 - GRAY 2 WAY......................1060
MEMORY SEAT/MIRROR MODULE C2 - GRAY 26 WAY.....................1060
MEMORY SEAT/MIRROR MODULE C3 - GRAY 16 WAY.....................1060
MEMORY SEAT/MIRROR MODULE C4 - WHITE 12 WAY....................1061
MODE DOOR ACTUATOR (ATC) - GRAY 2 WAY...........................1061
MODE DOOR ACTUATOR (MTC) - GRAY 2 WAY...........................1061
MULTI-FUNCTION SWITCH - BLACK 4 WAY...............................1061
OCCUPANT RESTRAINT CONTROLLER - YELLOW/RED 23 WAY.............1062
OVERHEAD CONSOLE (EXCEPT BASE) - BLACK 12 WAY..................1062
PASSENGER AIRBAG - YELLOW 4 WAY..................................1063
PASSENGER BLEND DOOR ACTUATOR (ATC) - GRAY 2 WAY...............1063
PASSENGER BLEND DOOR ACTUATOR (MTC) - GRAY 2 WAY...............1063
PASSENGER DOOR LOCK SWITCH - BLACK 3 WAY.......................1063
PASSENGER FOLDING MIRROR RELAY (BUILT-UP-EXPORT) - BLUE 9 WAY . .1064
PASSENGER SEAT BELT SWITCH-2WAY...............................1064
PASSENGER SEAT BELT TENSIONER-2WAY............................1064
FUSES (IPM).........................................................1066
ACCESSORY RELAY..................................................1066
DEFOGGER RELAY...................................................1066
xxii

mitted on the bus even though a module may not
require all information to perform its function. It
will only respond to messages ªaddressedº to it
through binary coding process. This method of data
transmission significantly reduces the complexity
of the wiring in the vehicle and the size of wiring
harnesses. All of the information about the func-
tioning of all the systems is organized, controlled,
and communicated by the PCI bus, which is de-
scribed in the Communication Section of this gen-
eral information.
3.1 AIRBAG SYSTEM/OCCUPANT
RESTRAINT CONTROLLER SYSTEM
The 2001 Minivan Airbag System contain the
following components: Occupant Restraint Control-
ler (ORC), Airbag Warning Indicator, Clockspring,
Driver and Passenger Airbags, Seat belt Tensioners
(SBT), Hall-effect Seat Belt Switches (SBS), Left
and Right Side Airbag Control Module (SIACM),
and Seat (mounted side) Airbags.
The Occupant Restraint Controller (ORC) is a
new type of Airbag Control Module (ACM) that
supports staged airbag deployment. Staged deploy-
ment is the ability to trigger airbag system squib
inflators all at once or individually as needed to
provide the appropriate restraint for the severity of
the impact. The ORC has four major functions: PCI
Bus communications, onboard diagnostics, impact
sensing, and component deployment. The ORC also
contains an energy-storage capacitor. This capaci-
tor stores enough electrical energy to deploy the
front airbag components for two seconds following a
battery disconnect or failure during an impact. The
ORC is secured to the floor panel transmission
tunnel below the instrument panel inside the vehi-
cle. The ORC cannot be repaired or adjusted and
must be replaced.
The ORC sends and/or receives PCI Bus mes-
sages with the Instrument Cluster (MIC), Body
Control Module (BCM), and Powertrain Control
Module (PCM). Diagnostic trouble codes will be set
if the communication with these modules is lost or
contains invalid information.
The microprocessor in the ORC monitors the
impact sensor signal and the airbag system electri-
cal circuits to determine the system readiness. The
ORC also monitors bus messages from both SIACM.
If the ORC detects a monitored system fault or
SIACM fault, it sends a message to the instrument
cluster via PCI bus to turn on the airbag warning
indicator. The ORC can set both active and stored
diagnostic trouble codes to aid in the diagnosing
system problems. See ORC/SIACM DIAGNOSTIC
TROUBLE CODES in this section.
The ORC has an internal accelerometer that
senses the rate of vehicle deceleration, which pro-vides verification of the direction and severity of an
impact. A pre-programmed decision algorithm in
the ORC microprocessor determines when the de-
celeration rate is severe enough to require airbag
system protection. The Occupant Restraint Control-
ler (ORC) also uses the driver and front passenger
seat belt switch status (buckled or unbuckled) as
inputs to determine the level of airbag deployment,
low, medium, or high as well as whether or not the
seat belt tensioners should deploy. The ORC also
uses the crash severity to determine the level of
driver and front passenger deployment, low me-
dium or high. When the programmed conditions are
met, the ORC sends an electrical signal to deploy
the appropriate airbag system components.WARNING: THE AIRBAG SYSTEM IS A
SENSITIVE, COMPLEX ELECTRO-
MECHANICAL UNIT. BEFORE ATTEMPTING
TO DIAGNOSE OR SERVICE ANY AIRBAG
SYSTEM OR RELATED STEERING WHEEL,
STEERING COLUMN, OR INSTRUMENT
PANEL COMPONENTS YOU MUST FIRST
DISCONNECT AND ISOLATE THE BATTERY
NEGATIVE (GROUND) CABLE. WAIT TWO
MINUTES FOR THE SYSTEM CAPACITOR TO
DISCHARGE BEFORE FURTHER SYSTEM
SERVICE. THIS IS THE ONLY SURE WAY TO
DISABLE THE AIRBAG SYSTEM. FAILURE
TO DO THIS COULD RESULT IS ACCIDENTAL
AIRBAG DEPLOYMENT AND POSSIBLE
PERSONAL INJURY. NEVER STRIKE OR
KICK THE AIRBAG CONTROL MODULE, AS
IT CAN DAMAGE THE IMPACT SENSOR OR
AFFECT ITS CALIBRATION. IF AN AIRBAG
CONTROL MODULE IS ACCIDENTALLY
DROPPED DURING SERVICE, THE MODULE
MUST BE SCRAPPED AND REPLACED WITH
A NEW UNIT.
The airbag warning lamp is the only point at
which the customer can observe symptoms of a
system malfunction. Whenever the ignition key is
turned to the run or start position, the MIC per-
forms a lamp check by turning the airbag warning
indicator on for 6-8 seconds. After the lamp check, if
the indicator turns on, it means that the ORC has
checked the system and found it to be free of
discernible malfunctions. If the lamp remains on,
there could be an active fault in the system or the
MIC lamp circuit may be internally shorted to
ground. If the lamp comes on and stays on for a
period longer than 6-8 seconds then goes off, there
is usually an intermittent problem in the system.
2
GENERAL INFORMATION

if the system is functioning properly. If the test
finds a problem the SIACM will set both active and
stored diagnostic trouble codes. If a DTC is active
the SIACM will request that the airbag warning
lamp be turned on. The results of the system test
are transmitted on the PCI Bus to the ORC once
each second or on change in lamp state. If the
warning lamp status message from the either SI-
ACM contains a lamp on request, the ORC will set
an active DTC. At the same time as the DTC is set
the ORC sends a PCI Bus message to the mechan-
ical instrument cluster (MIC) requesting the airbag
warning lamp be turned on. Observe all ORC warn-
ing and caution statements when servicing or han-
dling the SIACM. SIACM are not repairable and
must be replaced if they are dropped.
WARNING: THE AIRBAG SYSTEM IS A
SENSITIVE, COMPLEX ELECTRO-
MECHANICAL UNIT. BEFORE ATTEMPTING
TO DIAGNOSE OR SERVICE ANY AIRBAG
SYSTEM OR RELATED STEERING WHEEL,
STEERING COLUMN, OR INSTRUMENT
PANEL COMPONENTS YOU MUST FIRST
DISCONNECT AND ISOLATE THE BATTERY
NEGATIVE (GROUND) CABLE. WAIT TWO
MINUTES FOR THE SYSTEM CAPACITOR TO
DISCHARGE BEFORE FURTHER SYSTEM
SERVICE. THIS IS THE ONLY SURE WAY TO
DISABLE THE AIRBAG SYSTEM. FAILURE
TO DO THIS COULD RESULT IN ACCIDENTAL
AIRBAG DEPLOYMENT AND POSSIBLE
PERSONAL INJURY. NEVER STRIKE OR
KICK THE AIRBAG CONTROL MODULE, AS
IT CAN DAMAGE THE IMPACT SENSOR OR
AFFECT ITS CALIBRATION. IF AN AIRBAG
CONTROL MODULE IS ACCIDENTALLY
DROPPED DURING SERVICE, THE MODULE
MUST BE SCRAPPED AND REPLACED WITH
A NEW UNIT.
The airbag warning lamp is the only point at
which the customer can observe symptoms of a
system malfunction. Whenever the ignition key is
turned to the run or start position, the MIC per-
forms a lamp check by turning the airbag warning
indicator on for 6-8 seconds. After the lamp check, if
the indicator turns on, it means that the ORC has
checked the system and found it to be free of
discernible malfuctions. If the lamp remains on,
there could be an active fault in the system or the
MIC lamp circuit may be internally shorted to
ground. If the lamp comes on and stays on for a
period longer than 6-8 seconds then goes off, there
is usually an intermittent problem in the system.
3.1.7 SEAT AIRBAGS (SAB)
The left and right seat airbag modules are located
in the outboard end of the front seat backs. The
airbag module contains a bag, an inflator (a small
canister of highly compressed argon gas) and a
mounting bracket. The seat airbag module cannot
be repaired and must be replaced if deployed or in
any way damaged. When supplied with the proper
electrical signal the inflator seals the hole in the
airbag cushion so it can discharge the compressed
gas it contains directly into the cushion. Upon
deployment, the seat back trim cover will tear open
and allow the seat airbag to fully deploy between
the seat and the door.
WARNING: SEAT AIRBAG CONTAINS ARGON
GAS PRESSURIZED TO OVER 17236.89 Kpa
(2500 PSI). DO NOT ATTEMPT TO
DISMANTLE AN AIRBAG MODULE OR
TAMPER WITH ITS INFLATOR. DO NOT
PUNCTURE, INCINERATE, OR BRING INTO
CONTACT WITH ELECTRICITY. DO NOT
STORE AT TEMPERATURE EXCEEDING 93ÉC
(200ÉF). REPLACE AIRBAG SYSTEM
COMPONENTS ONLY WITH PARTS
SPECIFIED IN THE CHRYSLER MOPAR
PARTS CATALOG. SUBSTITUTE PARTS MAY
APPEAR INTERCHANGEABLE, BUT
INTERNAL DIFFERENCES MAY RESULT IN
INFERIOR OCCUPANT PROTECTION. THE
FASTENERS, SCREWS, AND BOLTS
ORIGINALLY USED FOR THE AIRBAG
SYSTEM COMPONENTS HAVE SPECIAL
COATINGS AND ARE SPECIFICALLY
DESIGNED FOR THE AIRBAG SYSTEM. THEY
MUST NEVER BE REPLACED WITH ANY
SUBSTITUTES. ANY TIME A NEW FASTENER
IS NEEDED, REPLACE IT WITH THE
CORRECT FASTENERS PROVIDED IN THE
SERVICE PACKAGE OR SPECIFIED IN THE
MOPAR PARTS CATALOG.
3.1.8 ORC/SIACM DIAGNOSTIC TROUBLE
CODES
Airbag diagnostic trouble codes consist of active
and stored codes. If more than one code exists,
diagnostic priority should be given to the active
codes. Each diagnostic trouble code is diagnosed by
following a specific testing procedure. The diagnos-
tic test procedures contain step-by-step instructions
for determining the cause of the trouble codes. It is
not necessary to perform all of the tests in this book
to diagnose an individual code. Always begin by
reading the diagnostic trouble codes using the DRB.
Always begin diagnostic with the Table of Contents
6
GENERAL INFORMATION

3.7.6 EXTERIOR LIGHTING BATTERY
SAVER
The BCM monitors the status of, and controls, the
Park Lamps, Headlamps and Fog Lamp relays. If
any exterior lamps are left ON after the ignition is
turned OFF, the BCM will turn them OFF after 3
minutes.
3.7.7 AUTO HEADLAMPS
This feature is available on vehicles equipped
with both the Electrocromatic Mirror (ECM) and
the Compass/Mini-Trip Computer (CMTC). When
the BCM detects a day/night signal from the CMTC,
an ECM is present and Auto Headlamp mode is
selected.
3.8 FRONT CONTROL MODULE
The Front Control Module (FCM) is an electrical
control and interface center located in the engine
compartment. When it is mated to the Power Dis-
tribution Center (PDC), it is referred to as the
Intelligent Power Module (IPM). The IPM, with its
fuses and relays provides power and signal distri-
bution throughout most of the vehicle. The FCM
receives both hard wire and digital electronic inputs
from the vehicle electrical system through the PDC.
Based on these inputs and the ignition switch
position, it provides direct power feeds and relay
control to some of the vehicles' most critical electri-
cal systems.
The Front Control Module provides the following
features:
Controlled power feeds:
²Front airbag system
²Side airbag system
²Headlamp power
²EATX module power (4 speed only)
²Front washer motor
²Rear washer motor
²Brake shift interlock system
Relay controls:
²Fog lamp relay (when equipped)
²Park lamp relay
²Front wiper on relay
²Front wiper high/low relay
²Accessory relay
²Horn relay
²Front & rear blower relay
²Name brand speakers (NBS) relay
²Electronic back light (EBL) run only relay
²Cabin heater relayElectrical inputs:
²Headlamp battery supplies1&2
²Module battery supply
²Power ground
²Ignition switch RUN or START position status
²Ignition switch START only status
²PCI Bus
²Stop lamp switch
²Horn switch
²Back-up switch
²Wiper park switch
²Washer fluid level switch
²Brake fluid level switch
²Ambient temperature sensor
²Right park lamp outage
²Left park lamp outage
²Battery IOD
²Battery (+) connection detection
²Flash reprogramming voltage
3.8.1 CONTROLLED POWER FEEDS
Front airbag system
The FCM provides power to the Occupant Re-
straint Control (ORC) system through two ªfuse-
lessº circuits (ORC RUN/START, and ORC RUN
only). These circuits are electronically controlled
and continuously monitored for malfunctions.
Power is supplied while the ignition switch is in the
RUN and START positions on pin 48 of the FCM
connector, and in the RUN only position on pin 29.
Side airbag system
The FCM provides power to the Side Impact
Airbag Control Module (SIACM) system through
one ªfuselessº circuit. This circuit is electronically
controlled and continuously monitored for malfunc-
tions. Power is supplied in the ignition RUN and
START positions on pin 28 of the FCM connector.
Headlamp power
The headlamp switch is a direct input to the
BCM. The BCM sends a PCI Bus message to the
FCM informing it of a headlamp switch status
change. The FCM then turns on power to the
headlamps through four ªfuselessº circuits. These
circuits are electronically controlled and continu-
ously monitored for malfunctions. Power is supplied
to each filament in a separate circuit (RH low on pin
6, RH high on pin 4, LH low on pin 3 and LH high
on pin 5). For vehicles equipped with Daytime
Running Lamps (DRL), the FCM electronically
steps down the headlamp voltage to provide the
desired illumination.
13
GENERAL INFORMATION

Front and rear blower relay
The blower control switch is part of the Automatic
Temperature Control (ATC) or A/C-Heater Control
Module, (Manual Temp). When the blower switch is
turned on, the ATC or A/C-Heater Control Module
sends a PCI Bus message to the FCM. The front and
rear blower relay is then powered through low side
control on pin 30 of the FCM. The relay provides the
high side to the blower motor, and the blower speed
is governed through low side control in the ATC or
A/C-Heater Control Module. This circuit is electron-
ically 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 pow-
ered 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 contin-
uously 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 posi-
tion. This circuit is electronically controlled and
continuously monitored for malfunctions.
Cabin Heater Relay
When the ignition is in Run, the FCM monitors
the PCI bus for the Cabin Heater Activation re-
quest. The A/C ± Heater Control Module initiates
this request only when all conditions for Cabin
Heater activation are favorable. The request carries
the status bit that the FCM requires to activate its
Cabin Heater Assist Control output. This output is
a low side driver (coming from FCM pin 15) which
supplies a ground signal to the Cabin Heater (pin
5). When the Cabin Heater receives this ground
signal input, it interprets this as an activation
signal. The FCM low side driver is also capable of
diagnostic sensing. The driver will sense an open
circuit when the driver is off, and will sense a short
to voltage when the driver is on. The FCM will set
DTCs for both of these types of faults. For addi-
tional information, refer to Cabin Heater under
General Information and Diagnostic Procedures in
the manual.3.8.3 ELECTRICAL INPUTS
Headlamp battery supplies1&2Ð12 volt
input on pins 1 and 2. Battery supply voltage for
switching headlamp circuits only.
Module battery supply Ð12 volt input on pin 9.
Battery supply voltage for all other FCM opera-
tions.
Power ground ÐGround source on pin 8 for all
FCM operations.
Ignition switch RUN or START position status
Ð12 volt input on pin 37. Allows the FCM to
determine the ignition switch status for related
FCM operations.
Ignition switch START only status Ð12 volt
input on pin 19. Allows the FCM to discriminate
between RUN/START input and START for related
FCM operations.
PCI Bus ÐApproximately 7.5 volt input on pin 22.
Allows the FCM to communicate with other mod-
ules on the vehicle bus.
Stop lamp Switch status Ð12 volt input on pin
44. Provides for brake shift interlock function.
Horn Switch ÐGround input on pin 17. Primary
means for engaging the horn.
Back-up switch ÐGround input on pin 39. Input
is converted to a PCI Bus status message for use by
other modules.
Wiper park switch ÐGround input on pin 16.
Used to determine park placement of wipers. Also
used as feedback to FCM to determine correct
operating mode of wipers.
Washer fluid level switch ÐGround input to
pull-up on pin 18. Ground is switched into the
circuit when washer bottle fluid level is low.
Brake fluid level switch ÐGround input to
pull-up on pin 36. Ground is switched into the
circuit when brake fluid level is low.
Ambient temperature sensor ÐResistive input
to pull-up on pin 25. Corresponding voltage level is
converted to a PCI Bus message for use by other
modules on the bus.
Right park lamp outage Ð12 volt input on pin
21. Used to determine if right park lamp circuit is
operating properly.
Left park lamp outage Ð12 volt input on pin 41.
Used to determine if left park lamp circuit is
operating properly.
Battery IOD Ð12 volt input on pin 20. The FCM
enters a low power consumption mode when the
ignition is turned OFF. This low current draw
battery supply keeps the microprocessor function-
ing in the low power mode.
Battery (+) connection detection Ð12 volt
input on pin 38. The battery connection on the PDC
incorporates the use of an internal switch to deter-
mine if the connector is properly mated and the
Connector Positive Assurance (CPA) is engaged. If
15
GENERAL INFORMATION

the CPA is not properly engaged, a voltage on pin 38
will be interpreted as an unseated connector and a
fault will set.
Flash programming voltage Ð20 volt input on
pin 42. When a DRBIIItis connected and the
proper flash reprogramming sequence is selected,
the 20 volt signal will be applied through pin 42.
3.9 HEATING & A/C
3.9.1 AUTOMATIC TEMPERATURE
CONTROL (ATC)
3.9.1.1 CABIN HEATER
For vehicles equipped with a diesel engine, a
Cabin Heater is used in conjunction with the HVAC
system. The Cabin Heater is designed to supply the
vehicle's occupants with heat prior to the engine
reaching operating temperature. For additional in-
formation on this system, refer to Cabin Heater
under General Information and Diagnostic Proce-
dures in this manual.
3.9.1.2 SYSTEM OPERATION
The Automatic Temperature Control (ATC) sys-
tem provides fully adjustable three zone climate
control; Driver front zone, Passenger Front zone
and Rear zone. The following is a list of ATC
controls and features:
± a POWER button which allows the operator to
turn the system completely off.
± AUTO HIGH/LOW switch allows the operator
to select what rate (fan speed) the system will
provide the selected comfort level.
± DRIVER, REAR and PASSENGER rocker
switches to select desired temperature for each
zone.
± Recirculation button allows cooling air to be
recirculated which maximizes cooling ability.
± A/C select button allows the operator to turn
the A/C compressor off.
± Defroster button allows the operator to turn on
the defroster independently during automatic
control.
± Fan control rotary switch for selecting fan
speed.
± Mode rotary switch for selecting heating/
cooling direction.
± REAR SYSTEM rotary switch for activating
the Rear ATC Switch allowing intermediate
passenger control over rear climate control.
3.9.1.3 BLOWER MOTOR OPERATION
The Automatic Temperature Control (ATC) front
and rear blower control provides continuously vari-
able control of air flow rate to meet occupant
comfort requirements. Pulse width modulation of
the blower motor power allows the front and rear
blower to operate at any speed from off to full speed.
When front or rear blower operation is required, the
ATC sends a PCI Bus message to the Front Control
Module (FCM) requesting blower relay ON. The
FCM provides a ground for the front and rear
blower motor relay coils, activating both relays. The
front and rear blower relays provide 12 volts to
their respective blower motor power modules. Each
module provides a 12 volt blower motor control
signal to the ATC. The ATC provides a pulse width
modulated (duty-cycle) ground signal to this circuit
based on climate requirements. The higher voltage
on the signal circuit (less duty-cycle ground) the
lower the blower speed request. The lower voltage
on the signal circuit (more duty-cycle ground) the
higher the blower speed request.
3.9.1.4 INFRARED SENSORS
The ATC system uses infrared (I/R) sensors to
monitor and control oocupant comfort levels. This
sensing system replaces interior air temperature
and solar sensors which required complex control
programs to maintain occupant comfort levels. The
front I/R sensor is located in the instrument panel
center bezel outlet. The rear I/R sensor is located in
the rear overhead mounted ATC switch.
3.9.1.5 REAR ATC SWITCH
The rear ATC switch is mounted in the headliner.
The switch contains a rotary adjustment for fan
speed, a rotary adjustment for mode selection, a
push button switch for temperature selection and a
digital display of the selected temperature.
3.9.1.6 COOLDOWN TESTING
The ATC provides a feature referred to as a
Cooldown Test. This test is initiated using the
DRBIIItand is designed to check the performance
of the air conditioning system. The ATC will not
perform this test if the ambient air temperature is
below 12ÉC (53ÉF). During the test, the ATC com-
pares the ambient air temperature to the evapora-
tor temperature sensor. To pass the cooldown test,
the evap temperature sensor must drop -6ÉC (20ÉF)
below ambient temperature within 2 minutes of
start of test. At the completion of the cooldown test
the DRBIIItwill display one of the following mes-
sages indicating test outcome:
± Cooldown Test Passed
± Cooldown Test Failed
16
GENERAL INFORMATION