Chrysler Pacifica. Manual — part 888
OPERATION
The dual infrared temperature sensors provide
independent measurement inputs to the automatic
temperature control (ATC) A/C-heater control module
that indicates the surface temperature of the driver
seat and front seat passenger seat occupants. By
using a surface temperature measurement, rather
than an air temperature measurement, the ATC sys-
tem is able to adjust itself to the comfort level as per-
ceived by the occupant. This allows the system to
detect and compensate for other ambient conditions
affecting comfort levels, such as solar heat gain or
evaporative heat loss. The ATC system logic responds
to the infrared sensor inputs by calculating and
adjusting the air flow temperature and air flow rate
needed to properly obtain and maintain the individ-
ually selected comfort level temperatures of both the
driver and passenger seat occupants.
The ATC A/C-heater control module continually
monitors the infrared sensor circuits, and will store a
diagnostic trouble code (DTC) for any problem it
detects. The infrared temperature sensor is diag-
nosed using a DRBIII
t scan tool. Refer to Body Diag-
nostic Procedures.
The
infrared
sensors
cannot
be
adjusted
or
repaired and, if faulty or damaged, the A/C-heater
control must be replaced.
MODE DOOR ACTUATOR
DESCRIPTION
The mode door actuator for the heating-A/C system
is a reversible, 12-volt Direct Current (DC), servo
motor (Fig. 23). The single mode door actuator is
located on the driver side end of the HVAC air dis-
tribution housing, close to the top of the housing. The
mode door actuator is mechanically connected to the
mode-air doors.
The mode door actuator is interchangeable with
the actuators for the blend-air doors and the recircu-
lation-air door. Each actuator is contained within an
identical black molded plastic housing with an inte-
gral wire connector receptacle. Each actuator also
has an identical output shaft with splines that con-
nects it to its respective door linkage and two inte-
gral mounting tabs that allow the actuator to be
secured to the HVAC housing. The mode door actua-
tor does not require mechanical indexing to the
mode-air doors, as it is electronically calibrated by
the A/C-heater control.
The A/C-heater control must be recalibrated each
time an actuator motor is replaced (Refer to 24 -
HEATING & AIR CONDITIONING/CONTROLS -
FRONT/A/C
HEATER
CONTROL
-
STANDARD
PROCEDURE -A/C-HEATER CONTROL CALIBRA-
TION).
OPERATION
The mode door actuator is connected to the A/C-
heater control through the vehicle electrical system
by a dedicated two-wire lead and connector of the
HVAC wire harness. The mode door actuator can
move the mode-air doors in two directions. When the
A/C-heater control pulls the voltage on one side of
the motor connection high and the other connection
low, the mode-air doors will move in one direction.
When the A/C-heater control reverses the polarity of
the voltage to the motor, the mode-air doors move in
the opposite direction.
When the A/C-heater control makes the voltage to
both connections high or both connections low, the
mode-air doors stop and will not move.
The A/C-heater control uses a feedback signal posi-
tioning system to monitor the operation and relative
position of the mode door actuator and the mode-air
doors. The A/C-heater control learns the mode-air
doors stop positions during the calibration procedure
and will store a diagnostic trouble code (DTC) for any
problems it detects in the mode door actuator cir-
cuits.
The mode door actuator is diagnosed using a
DRBIII
t scan tool. Refer to 9 - Engine Electrical
Diagnostics for more information.
The mode door actuator cannot be adjusted or
repaired and, if faulty or damaged, it must be
replaced.
Fig. 23 Mode Door Actuator
1 - ACTUATOR MOTOR
2 - WIRE CONNECTOR RECEPTACLE
3 - OUTPUT SHAFT
4 - MOUNTING TAB (2)
CS
CONTROLS - FRONT
24 - 29
INFRARED TEMPERATURE SENSOR (Continued)
REMOVAL
WARNING: On vehicles equipped with airbags, dis-
able the airbag system before attempting any steer-
ing wheel, steering column, or instrument panel
component diagnosis or service. Disconnect and
isolate the negative battery (ground) cable, then
wait two minutes for the airbag system capacitor to
discharge before performing further diagnosis or
service. This is the only sure way to disable the air-
bag system. Failure to take the proper precautions
could result in accidental airbag deployment and
possible personal injury or death.
(1) Disconnect and isolate the negative battery
cable.
(2) Remove the silencer from beneath the driver
side end of the instrument panel. (Refer to 23 -
BODY/INSTRUMENT
PANEL/INSTRUMENT
PANEL SILENCER - REMOVAL).
(3) Disconnect the wire harness connector from the
mode door actuator (Fig. 24).
(4) Remove the two screws that secure the mode
door actuator to the HVAC air distribution housing
and remove the actuator.
INSTALLATION
(1) Position the mode door actuator onto the HVAC
air distribution housing. If necessary, rotate the
actuator slightly to align the splines on the actuator
output shaft with those in the mode door linkage.
(2) Install the two screws that secure the mode
door actuator to the air distribution housing. Tighten
the screws to 2 N·m (17 in. lbs.).
(3) Connect the wire harness connector to the
mode door actuator.
(4) Install the silencer under the driver side end of
the instrument panel (Refer to 23 - BODY/INSTRU-
MENT PANEL/INSTRUMENT PANEL SILENCER -
INSTALLATION).
(5) Reconnect the negative battery cable and cali-
brate the A/C-heater control (Refer to 24 - HEATING
& AIR CONDITIONING/CONTROLS - FRONT/A/C
HEATER CONTROL - STANDARD PROCEDURE
-A/C-HEATER CONTROL CALIBRATION).
RECIRCULATION DOOR
ACTUATOR
DESCRIPTION
The recirculation door actuator is a reversible, 12
volt direct current (DC), servo motor (Fig. 25). The
recirculation door actuator is located on the bottom of
the HVAC air inlet housing and is directly connected
to the pivot shaft of the recirculation-air door.
The recirculation door actuator is interchangeable
with the actuators for the blend-air door(s) and the
mode-air doors. Each actuator is contained within an
identical black molded plastic housing with an inte-
gral wire connector receptacle. Each actuator also
has an identical output shaft with splines that con-
nects it to its door linkage and two integral mounting
tabs that allow the actuator to be secured to the air
inlet housing. The recirculation door actuator does
not require mechanical indexing to the recirculation-
air door, as it is electronically calibrated by the A/C-
heater control.
The A/C-heater control must be recalibrated each
time an actuator motor is replaced (Refer to 24 -
HEATING & AIR CONDITIONING/CONTROLS -
FRONT/A/C
HEATER
CONTROL
-
STANDARD
PROCEDURE -A/C-HEATER CONTROL CALIBRA-
TION).
OPERATION
The recirculation door actuator is connected to the
A/C-heater control through the vehicle electrical sys-
tem by a dedicated two-wire lead and connector of
the HVAC wire harness. The recirculation door
actuator can move the recirculation-air door in two
directions. When the A/C-heater control pulls the
voltage on one side of the motor connection high and
the other connection low, the recirculation-air door
will move in one direction. When the A/C-heater con-
trol reverses the polarity of the voltage to the motor,
the recirculation-air door moves in the opposite direc-
tion.
Fig. 24 Mode Door Actuator
1 - WIRE HARNESS CONNECTOR
2 - MODE DOOR ACTUATOR
3 - SCREW (2)
4 - DRIVER BLEND DOOR ACTUATOR (DUAL-ZONE)
5 - HEATER CORE
6 - BLEND DOOR ACTUATOR
24 - 30
CONTROLS - FRONT
CS
MODE DOOR ACTUATOR (Continued)
When the A/C-heater control makes the voltage to
both connections high or both connections low, the
recirculation-air door stops and will not move.
The A/C-heater control uses a feedback signal posi-
tioning system to monitor the operation and relative
position of the recirculation door actuator and the
recirculation-air door. The A/C-heater control learns
the recirculation-air door stop positions during the
calibration procedure and will store a diagnostic
trouble code (DTC) for any problems it detects in the
recirculation door actuator circuits.
The recirculation door actuator is diagnosed using
a DRBIII
t scan tool. Refer to 9 - Engine Electrical
Diagnostics for more information.
The recirculation door actuator cannot be adjusted
or repaired and, if faulty or damaged, it must be
replaced.
REMOVAL
WARNING: On vehicles equipped with airbags, dis-
able the airbag system before attempting any steer-
ing wheel, steering column, or instrument panel
component diagnosis or service. Disconnect and
isolate the negative battery (ground) cable, then
wait two minutes for the airbag system capacitor to
discharge before performing further diagnosis or
service. This is the only sure way to disable the air-
bag system. Failure to take the proper precautions
could result in accidental airbag deployment and
possible personal injury or death.
(1) Disconnect and isolate the negative battery
cable.
(2) Pull the carpet on the passenger side front
floor away from the dash panel far enough to access
the recirculation door actuator.
(3) Disconnect the HVAC wire harness connector
from the recirculation door actuator (Fig. 26).
(4) Remove the two screws that secure the recircu-
lation door actuator to the air inlet housing and
remove the actuator.
INSTALLATION
(1) Position the recirculation door actuator onto
the air inlet housing. If necessary, rotate the actuator
slightly to align the splines on the actuator output
shaft with those in the recirculation-air door pivot
shaft.
(2) Install the two screws that secure the recircu-
lation door actuator to the air inlet housing. Tighten
the screws to 2 N·m (17 in. lbs.).
(3) Connect the HVAC wire harness connector to
the recirculation door actuator.
(4) Reposition the carpet on the passenger side
front floor back up to the dash panel.
(5) Reconnect the negative battery cable and cali-
brate the A/C-heater control (Refer to 24 - HEATING
& AIR CONDITIONING/CONTROLS - FRONT/A/C
HEATER CONTROL - STANDARD PROCEDURE
-A/C-HEATER CONTROL CALIBRATION).
Fig. 25 Recirculation Door Actuator
1 - ACTUATOR MOTOR
2 - WIRE CONNECTOR RECEPTACLE
3 - OUTPUT SHAFT
4 - MOUNTING TAB (2)
Fig. 26 Recirculation Door Actuator
1 - AIR INLET HOUSING
2 - RECIRCULATION DOOR ACTUATOR
3 - HVAC WIRE HARNESS
4 - SCREW (2)
5 - LOWER HVAC HOUSING
CS
CONTROLS - FRONT
24 - 31
RECIRCULATION DOOR ACTUATOR (Continued)
CONTROLS - REAR
TABLE OF CONTENTS
page
page
BLOWER MOTOR RELAY
. . . . . . . . . . . . . . . . . . . . . . . . . 32
. . . . . . . . . . . . . . . . . . . . . . . . . . . 32
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
. . . . . . . . . . . . . . . . . . . . . . . . . 33
BLOWER MOTOR SWITCH
. . . . . . . . . . . . . . . . . . . . . . . . . 33
. . . . . . . . . . . . . . . . . . . . . . . . . . . 33
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
. . . . . . . . . . . . . . . . . . . . . . . . . 34
MODE DOOR ACTUATOR
. . . . . . . . . . . . . . . . . . . . . . . . . 34
. . . . . . . . . . . . . . . . . . . . . . . . . . . 34
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
. . . . . . . . . . . . . . . . . . . . . . . . . 35
BLOWER MOTOR POWER MODULE
. . . . . . . . . . . . . . . . . . . . . . . . . 35
. . . . . . . . . . . . . . . . . . . . . . . . . . . 36
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
. . . . . . . . . . . . . . . . . . . . . . . . . 36
BLOWER MOTOR RELAY
DESCRIPTION
The rear blower motor relay used in the rear cen-
ter floor console when equipped with the automatic
temperature control (ATC) heating-A/C system is a
International
Standards
Organization
(ISO)-type
relay (Fig. 1). Relays conforming to the ISO specifi-
cations have common physical dimensions, current
capacities, terminal functions and patterns.
The rear blower motor relay is located in the inte-
grated power module (IPM) in the engine compart-
ment.
OPERATION
The rear blower motor relay is an electromechani-
cal switch that uses a low current input from the
front control module (FCM) to control the high cur-
rent output to the rear blower motor power module.
The movable, common feed relay contact is held
against the fixed, normally closed relay contact by
spring pressure. When the electromagnetic relay coil
is energized, it draws the movable common feed relay
contact away from the fixed, normally closed relay
contact and, holds it against the fixed, normally open
relay contact. This action allows high current to flow
to the rear blower motor.
When the relay coil is de-energized, spring pres-
sure returns the movable relay contact back against
the fixed, normally closed contact point. The resistor
or diode is connected in parallel with the relay coil,
and helps to dissipate voltage spikes and electromag-
netic interference that can be generated as the elec-
tromagnetic field of the relay coil collapses.
The rear blower motor relay terminals are con-
nected to the vehicle electrical system through a
receptacle in the integrated power module (IPM). The
inputs and outputs of the rear blower motor relay
include:
• The common feed terminal (30) receives a bat-
tery current input from the battery through a B(+)
circuit at all times.
• The coil ground terminal (85) receives a ground
input through the front/rear blower motor relay con-
trol circuit only when the FCM electronically pulls
the control circuit to ground.
• The coil battery terminal (86) receives a battery
current input from the battery through a B(+) circuit
at all times.
• The normally open terminal (87) provides a bat-
tery current output to the rear blower motor power
module through a fuse in the IPM on the fused rear
blower motor relay output circuit only when the rear
blower motor relay coil is energized.
• The normally closed terminal (87A) is not con-
nected to any circuit in this application, but provides
a battery current output only when the rear blower
motor relay coil is de-energized.
Fig. 1 Rear Blower Motor Relay
30
COMMON FEED
85
COIL BATTERY
86
COIL GROUND
87
NORMALLY OPEN
87A
NORMALLY CLOSED
24 - 32
CONTROLS - REAR
CS
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