The rear blend door actuator (1) is a reversible, 12
volt direct current (DC), servo motor. The rear blend
door actuator is located on the side of the rear HVAC
housing. The rear blend door actuator is interchange-
able with the actuator for the mode-air door. Each
actuator is contained within an identical black molded
plastic housing with an integral wire connector recep-
tacle. Three integral mounting tabs allow the actuator
to be secured to the rear HVAC housing. Each actua-
tor also has an identical output shaft with splines that
connects it to the rear blend-air door. The rear blend
door actuator does require mechanical indexing to the
rear blend-air door, as it is electronically calibrated by
the A/C-heater control.

OPERATION

The rear blend door actuator is connected to the A/C-heater control through the vehicle electrical system by a ded-
icated two-wire lead and connector of the rear HVAC wire harness. The reawr blend door actuator can move the
rear blend-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 rear blend-air door will move in one direction. When the A/C-heater
control reverses the polarity of the voltage to the motor, the rear blend-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 rear blend-air
door stops and will not move. The A/C-heater control uses a pulse-count positioning system to monitor the operation
and relative position of the rear blend door actuator and the rear blend-air door. The A/C-heater control learns the

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24 - 369

rear blend-air door stop positions during the calibration procedure and will store a diagnostic trouble code (DTC) for
any problems it detects in the rear blend door actuator circuit.

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

The rear blend door actuator is diagnosed using a scan tool. Refer to 24 - HVAC Electrical Diagnostics for more
information.

REMOVAL

1. Disconnect and isolate the negative battery cable.

2. Remove right rear quarter panel trim (Refer to 23 -

BODY/INTERIOR/QUARTER

PANEL

TRIM

REMOVAL).

3. Remove the screws (4) that secure the rear blend

door actuator (2) to the side of the rear HVAC
housing (3).

4. Disconnect the rear HVAC wire harness connector

(1) from the rear blend door actuator.

5. Remove the rear blend door actuator from the rear

HVAC housing.

INSTALLATION

1. Position the rear blend door actuator (1) onto the

side of the rear HVAC housing (2). If necessary,
rotate the actuator slightly to align the splines on
the actuator output shaft (3) with those on the rear
actuator coupler (4).

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CONTROLS - REAR

2. Install the screws (4) that secure the rear blend

door actuator (2) to the rear HVAC housing (3).
Tighten the screws to 2 N·m (17 in. lbs.).

3. Connect the rear HVAC wire harness connector (1)

to the rear blend door actuator.

4. Install the right rear quarter panel trim (Refer to 23

BODY/INTERIOR/QUARTER

PANEL TRIM

INSTALLATION).

5. Reconnect the negative battery cable.

6. Initiate the Actuator Calibration function using a

scan tool. Refer to HVAC System Test, found in 24
- HVAC - Electrical Diagnostics.

ACTUATOR-MODE DOOR

DESCRIPTION

The rear mode door actuator (1) is a reversible,
12–volt direct current (DC), servo motor. The rear
mode door actuator is located near the front end of
the rear HVAC housing. The rear mode door actuator
is mechanically connected to the rear mode-air 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 connector receptacle.
Three integral mounting tabs allow the actuator to be
secured to the side of the rear HVAC housing. The
rear mode door actuator also has an identical output
shaft with splines that connects it to the mode-air
door. The rear mode door actuator does not require
mechanical indexing to the mode-air door, as it is
electronically calibrated by the A/C-heater control.

OPERATION

The rear mode door actuator is connected to the A/C-heater control through the vehicle electrical system by a ded-
icated two-wire lead and connector of the rear HVAC wire harness. The rear mode door actuator can move the rear
model-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 rear mode-air door will move in one direction. When the A/C-heater control
reverses the polarity of the voltage to the motor, the rear mode-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 rear mode-air
door stops and will not move. The A/C-heater control uses a pulse-count positioning system to monitor the operation
and relative position of the rear mode door actuator and the rear mode-air door. The A/C-heater control learns the
rear mode-air door stop positions during the calibration procedure and will store a diagnostic trouble code (DTC) for
any problems it detects in the rear mode door actuator circuit.

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

CONTROLS - REAR

24 - 371

The rear mode door actuators are diagnosed using a scan tool. Refer to 24 - HVAC Electrical Diagnostics for more
information.

REMOVAL

1. Disconnect and isolate the negative battery cable.

2. Remove right rear quarter panel trim (Refer to 23 -

BODY/INTERIOR/QUARTER

PANEL

TRIM

REMOVAL).

3. Disconnect the rear HVAC wire harness connector

(1) from the rear mode door actuator (2) located on
the side of the rear HVAC housing (3).

4. Remove the screws (4) that secure the rear mode

door actuator to the rear HVAC housing.

5. Remove the rear mode door actuator from the rear

HVAC housing.

INSTALLATION

1. Position the rear mode door actuator (1) onto the

side of the rear HVAC housing (2). If necessary,
rotate the actuator slightly to align the splines on
the actuator output shaft (3) with those in the
actuator coupler (4).

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