Chrysler RG Voyager. Manual — part 1218
(4) Remove the screw that secures the back of the
rear HVAC housing to the right D-pillar.
(5) Remove the screw that secures the front of the
rear HVAC housing to the right quarter inner panel.
(6) Carefully pull the top of the rear HVAC hous-
ing away from the right quarter inner panel far
enough to reach between the rear HVAC housing and
the quarter inner panel to access the rear blend door
actuator (Fig. 6).
(7) Remove the two screws that secure the rear
blend door actuator to the rear HVAC housing.
(8) Pull the rear blend door actuator away from
the rear HVAC housing far enough to disengage the
actuator output shaft from the rear blend door pivot.
(9) Raise the rear blend door actuator far enough
to access and disconnect the rear HVAC wire harness
connector from the actuator.
(10) Remove the rear blend door actuator from
between the rear HVAC housing and the quarter
inner panel.
INSTALLATION
(1) Position the rear blend door actuator between
the rear HVAC housing and the quarter inner panel.
(2) Connect the rear HVAC wire harness connector
to the rear blend door actuator.
(3) Position the rear blend door actuator onto the
rear HVAC housing. If necessary, rotate the actuator
slightly to align the splines on the actuator output
shaft with those in the blend air door pivot.
(4) Install the two screws that secure the rear
blend door actuator to the rear HVAC housing.
Tighten the screws to 2 N·m (17 in. lbs.).
(5) Push the top of the rear HVAC housing back
into position against the right quarter inner panel.
(6) Install the screw that secures the front of the
rear HVAC housing to the right quarter inner panel.
Tighten the screw to 11 N·m (97 in. lbs.).
(7) Install the screw that secures the back of the
rear HVAC housing to the right D-pillar. Tighten the
screw to 11 N·m (97 in. lbs.).
(8) Install the two screws that secure the top of
the quarter trim panel attaching bracket to the quar-
ter inner panel. Tighten the screws to 2 N·m (17 in.
lbs.).
(9) Reinstall the right quarter trim panel and
right D-pillar trim panel onto the quarter inner
panel (Refer to 23 - BODY/INTERIOR/QUARTER
TRIM PANEL - INSTALLATION).
(10) Reconnect the negative battery cable and cal-
ibrate the A/C-heater control (Refer to 24 - HEATING
& AIR CONDITIONING/CONTROLS - FRONT/A/C
HEATER CONTROL - STANDARD PROCEDURE
-A/C-HEATER CONTROL CALIBRATION).
BLOWER MOTOR RELAY
DESCRIPTION
The blower motor relay for the rear heating-A/C
system is a International Standards Organization
(ISO)-type relay (Fig. 7). Relays conforming to the
ISO specifications 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 resistor (man-
ual temperature control) or rear blower motor power
module (automatic temperature control). The mov-
able, common feed relay contact is held against the
fixed, normally closed relay contact by spring pres-
Fig. 6 Rear HVAC Mode Door Actuator
1 - SCREW (2)
2 - MODE DOOR ACTUATOR
3 - SCREW (2)
4 - CONNECTOR
5 - BLEND DOOR ACTUATOR
6 - WIRE HARNESS CONNECTOR
RS
CONTROLS - REAR
24 - 37
BLEND DOOR ACTUATOR (Continued)
sure. When the electromagnetic relay coil is ener-
gized, 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 blower motor resistor
(manual temperature control) or blower motor power
module (automatic temperature control) 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.
Refer to the appropriate wiring information for
diagnosis and testing of the micro-relay and for com-
plete HVAC wiring diagrams.
REMOVAL
(1) Disconnect and isolate the negative battery
cable.
(2) Remove the cover from the integrated power
module (IPM) (Fig. 8).
NOTE: Refer to the fuse and relay map on the IPM
cover for rear blower motor relay location.
(3) Remove the rear blower motor relay from the
IPM.
INSTALLATION
NOTE: Refer to the fuse and relay map on the cover
of the integrated power module (IPM) for rear
blower motor relay location.
(1) Position the rear blower motor relay to the
proper receptacle in the IPM.
(2) Align the rear blower motor relay terminals
with the terminal cavities in the IPM receptacle and
push down firmly on the relay until the terminals
are fully seated.
(3) Install the cover onto the IPM.
(4) Reconnect the negative battery cable.
Fig. 7 Rear Blower Motor Relay
Fig. 8 Rear Blower Motor Relay
1 - INTEGRATED POWER MODULE (IPM)
2 - REAR BLOWER MOTOR RELAY
3 - FRONT CONTROL MODULE (FCM)
24 - 38
CONTROLS - REAR
RS
BLOWER MOTOR RELAY (Continued)
BLOWER MOTOR RESISTOR
DESCRIPTION
A rear blower motor resistor is used on vehicles
equipped
with
the
manual
temperature
control
(MTC) heating-A/C system (Fig. 9). Vehicles equipped
with the automatic temperature control (ATC) heat-
ing-A/C system use a rear blower motor power mod-
ule, instead of the rear blower motor resistor (Refer
to 24 - HEATING & AIR CONDITIONING/CON-
TROLS - REAR/BLOWER MOTOR POWER MOD-
ULE - DESCRIPTION).
The rear blower motor resistor is mounted to the
rear HVAC housing, directly above the A/C expansion
valve. The rear blower motor resistor consists of a
molded plastic mounting plate with an integral con-
nector receptacle. Concealed behind the mounting
plate is an electrical circuit board with two resistors
and a thermal fuse.
The rear blower motor resistor is accessed for ser-
vice by removing the right quarter and D-pillar trim
panels.
OPERATION
The rear blower motor resistor is connected to the
vehicle electrical system through a dedicated take
out and connector of the rear HVAC wire harness.
The rear blower motor resistor has an electrical cir-
cuit board with two resistors, each of which will
reduce the current flow through the rear blower
motor to change the blower motor speed.
The blower motor switch in the manual tempera-
ture control system directs the ground path for the
rear blower motor through the correct resistor to
obtain the selected speed. With the blower motor
switch in the lowest speed position, the ground path
for the motor is applied through both resistors. Each
higher speed selected with the blower motor switch
applies the blower motor ground path through fewer
of the resistors, increasing the blower motor speed.
When the blower motor switch is in the highest
speed
position,
the
blower
motor
resistors
are
bypassed and the blower motor receives a direct path
to ground through the blower motor switch.
The rear blower motor resistor cannot be adjusted
or repaired and, if faulty or damaged, it must be
replaced.
DIAGNOSIS AND TESTING
REAR BLOWER MOTOR RESISTOR
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.
NOTE: For circuit descriptions and diagrams, refer
to the appropriate wiring information. The wiring
information includes wiring diagrams, proper wire
and connector repair procedures, 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) Disconnect and isolate the negative battery
cable.
(2) Disconnect the wire harness connector from the
blower motor resistor (Refer to 24 - HEATING & AIR
CONDITIONING/CONTROLS-REAR/BLOWER
MOTOR RESISTOR - REMOVAL).
(3) Using
an
ohmmeter,
check
for
continuity
between all of the blower motor resistor terminals. In
each case there should be continuity. If OK, repair
the wire harness circuits between the blower motor
switch and the blower motor resistor or blower motor
as required. If not OK, replace the faulty blower
motor resistor.
Fig. 9 Rear Blower Motor Resistor
1 - BLOWER MOTOR RESISTOR
2 - WIRE CONNECTOR RECEPTICAL
3 - RESISTORS AND HEAT SINK
RS
CONTROLS - REAR
24 - 39
REMOVAL
WARNING: The rear blower motor resistor block
may get very hot during normal operation. If the
blower motor was turned on prior to servicing the
blower motor resistor block, wait five minutes to
allow the blower motor resistors to cool before per-
forming diagnosis or service. Failure to take this
precaution can result in personal injury.
CAUTION: Do not operate the blower motor with the
blower motor resistor block removed from the cir-
cuit. Failure to take this precaution can result in
vehicle damage.
(1) Disconnect and isolate the negative battery
cable.
(2) Remove the right quarter trim panel and right
D-pillar trim panel from the quarter inner panel
(Refer to 23 - BODY/INTERIOR/QUARTER TRIM
PANEL - REMOVAL).
(3) Disconnect the rear HVAC wire harness con-
nector from the rear blower motor resistor (Fig. 10).
(4) Remove the two screws that secure the rear
blower motor resistor to the rear HVAC housing and
remove the resistor.
INSTALLATION
(1) Position the rear blower motor resistor into the
rear HVAC housing.
(2) Install the two screws that secure the rear
blower motor resistor to the rear HVAC housing.
Tighten the screws to 2 N·m (17 in. lbs.).
(3) Connect the rear HVAC wire harness connector
to the rear blower motor resistor.
(4) Reinstall the right quarter trim panel and
right D-pillar trim panel onto the quarter inner
panel (Refer to 23 - BODY/INTERIOR/QUARTER
TRIM PANEL - INSTALLATION).
(5) Reconnect the negative battery cable.
MODE DOOR ACTUATOR
DESCRIPTION
The mode door actuator for the rear heating-A/C
system is a reversible, 12-volt Direct Current (DC),
servo motor (Fig. 11). The mode door actuator is
located on the outboard side of the rear HVAC hous-
ing, above the blend door actuator. The mode door
actuator is mechanically connected to the mode door.
The rear mode door actuator is interchangeable
with the actuator for the rear blend-air door. Each
actuator is contained within an identical black
molded plastic housing with an integral wire connec-
tor receptacle. Each actuator also has an identical
output shaft with splines that connects it to its
respective door linkage and two integral mounting
tabs that allow the actuator to be secured to the rear
HVAC housing. The rear mode door actuator does not
require mechanical indexing to the mode-air door, as
it is electronically calibrated by the front 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 rear mode door actuator is connected to the
front heater-A/C control module through the vehicle
electrical system by a dedicated two-wire take out
and connector of the rear HVAC wire harness. The
rear mode door actuator can move the mode door in
two directions. When the front heater-A/C control
Fig. 10 Rear Blower Motor Resistor
1 - REAR HVAC HOUSING
2 - D-PILLAR
3 - BLOWER PIGTAIL WIRE
4 - CONNECTOR
5 - A/C EXPANSION VALVE
6 - SCREW (2)
7 - REAR BLOWER MOTOR RESISTOR
24 - 40
CONTROLS - REAR
RS
BLOWER MOTOR RESISTOR (Continued)
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