Chrysler 300/300 Touring/300C, Dodge Magnum. Manual - part 2327

ACTUATOR-MODE DOOR

DESCRIPTION

The mode door actuator (1) is a reversible, 12–volt
direct current (DC), servo motor. The mode door
actuator is located on the driver side end of the HVAC
air distribution housing, close to the instrument panel.
The mode door actuator is mechanically connected to
the floor, defrost/demist and the panel-air doors.

The mode door actuator is interchangeable with the
actuators for the blend-air door(s) and the recircula-
tion-air door. Each actuator is contained within an
identical black molded plastic housing with an integral
wire connector receptacle (2). Each actuator also has
an identical output shaft with splines (3) that connect it
to its door linkage and three integral mounting tabs (4)
that allow the actuator to be secured to the HVAC
housing. The mode door actuator does not require
mechanical indexing to the mode-air doors, as it is
electronically calibrated by the A/C-heater control.

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 floor, defrost/demist
and the panel-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 moves 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 pulse-count positioning 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 position during the calibration procedure and will store a diagnostic trouble code (DTC) for any problems
it detects in the mode door actuator circuits.

(Refer to 24 - HEATING & AIR CONDITIONING - DIAGNOSIS AND TESTING) and to 24 - HVAC Electrical Diag-
nostics for more information.

The mode door actuator cannot be adjusted or repaired and, if faulty or damaged, it must be replaced.

REMOVAL

WARNING: On vehicles equipped with airbags, disable the airbag system before attempting any steering
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 airbag system. Failure to
take the proper precautions could result in accidental airbag deployment and possible personal injury or
death.

24 - 342

CONTROLS

NOTE: LHD model shown. RHD model similar

1. Disconnect and isolate the negative battery cable.

2. Remove the instrument panel silencer from the

driver side of the instrument panel (Refer to 23 -
BODY/INSTRUMENT

PANEL/INSTRUMENT

PANEL SILENCER - REMOVAL).

3. Remove the screws (1) that secure the mode door

actuator (2) to the driver side of the HVAC air dis-
tribution housing (3).

4. Remove the mode door actuator from the air distri-

bution housing and disconnect the HVAC wire har-
ness connector (4) and remove the actuator from
the vehicle.

INSTALLATION

NOTE: LHD model shown in illustrations. RHD model similar.

1. Position the mode door actuator (1) into the vehi-

cle.

2. Install the mode door actuator onto the driver side

of the HVAC air distribution housing (2). If neces-
sary, rotate the actuator slightly to align the splines
on the actuator output shaft (3) with those on the
mode door cam (4).

CONTROLS

24 - 343

3. Install the screws (1) that secure the mode door

actuator (2) to the driver side of the air distribution
housing (3). Tighten the screws to 2 N·m (17 in.
lbs.).

4. Connect the HVAC wire harness connector (4) to

the mode door actuator.

5. Install the instrument panel silencer onto the driver

side of the instrument panel (Refer to 23 - BODY/
INSTRUMENT

PANEL/INSTRUMENT

PANEL

SILENCER - INSTALLATION).

6. Reconnect the negative battery cable.

24 - 344

CONTROLS

ACTUATOR-RECIRCULATION DOOR

DESCRIPTION

The recirculation door actuator (1) is a reversible, 12
volt direct current (DC), servo motor. The recirculation
door actuator is located on the inboard side 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 identi-
cal black molded plastic housing with an integral wire
connector receptacle (2). Each actuator also has an
identical output shaft with splines (3) that connect it to
its door linkage and three integral mounting tabs (4)
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.

OPERATION

The recirculation 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 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 con-
nection high and the other connection low, the recirculation-air door will move in one direction. When the A/C-heater
control reverses the polarity of the voltage to the motor, the recirculation-air door moves in the opposite direction.

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.

On ATC equipped vehicles, the A/C-heater control uses a pulse-count positioning 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.

On MTC equipped vehicles, the A/C-heater control uses a timer-type calibration procedure to check 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.

(Refer to 24 - HEATING & AIR CONDITIONING - DIAGNOSIS AND TESTING) and to 24 - HVAC Electrical Diag-
nostics for more information.

The recirculation door actuator cannot be adjusted or repaired and, if faulty or damaged, it must be replaced.

REMOVAL

CONTROLS

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