Suzuki XL7 2007 Service Manual page 1817

Air Delivery
The mode actuator controls air delivery. The HVAC
control module controls the actuator in order to distribute
airflow to a desired outlet. When the vehicle operator
selects the defrost, mix-blend or floor positions, the A/C
compressor clutch engages and the recirculation
actuator will be moved to the outside air position. The
flow of air during the various modes of operation is as
follows:
• Panel—Outside Air and Recirculation inlet air setting,
full air from Instrument Panel (I/P) outlets
• Bi-Level—I/P and front and rear floor outlets
• Floor—Small amount of air to the right and left side
window outlets and a larger amount of air to the Front
and Rear floor outlets
• Mix-Blend—Floor and defroster outlets with a slight
bleed to the I/P outlets
• Defrost—Defrost outlets with a small amount of air to
the right and left side window outlets and to the Driver
Side floor outlet and a very small amount to the Rear
floor outlet
Recirculation Operation
The recirculation actuator is a 5-wire bi-directional
electric motor that incorporates a feedback
potentiometer. Low reference, 5-volt reference, position
signal, and 2 control circuits enable the actuators to
operate. The control circuits use either a 0 or 12-volt
value to coordinate the actuator movement. When the
actuator is at rest, both control circuits have a value of 0
volts. In order to move the actuator, the HVAC control
module grounds one of the control circuits while
providing the other with 12 volts. The HVAC control
module reverses the polarity of the control circuits to
move the actuator in the opposite direction. When the
actuator shaft rotates, the potentiometer's adjustable
contact changes the door position signal between 0-5
volts.
Heating, Ventilation and Air Conditioning:
Air Temperature Description and Operation
The air temperature controls are divided into 4 areas:
• HVAC control components
• Heating and A/C operation
• Engine coolant
• A/C cycle
HVAC CONTROL COMPONENTS
HVAC Control Module
The HVAC control module is a non-class 2 device that
interfaces between the operator and the HVAC system
to maintain air temperature and distribution settings. The
battery positive and ignition 1 voltage circuits provide
power to the control module. The control module
supports the following features:
Feature
After Blow
Purge
Personalization
Actuator Calibration
Auxiliary HVAC Control Module
The auxiliary HVAC control module is a class 2 device
that interfaces between the rear seat occupants and the
auxiliary HVAC system to maintain auxiliary air
temperature and auxiliary air distribution settings. The
battery positive voltage circuit provides power that the
control module uses for KAM. If the battery positive
voltage circuit loses power, all auxiliary HVAC DTCs and
settings will be erased from KAM. The auxiliary HVAC
control module will perform a recalibration of the electric
actuators when commanded with a scan tool or if KAM is
lost. This will ensure the actuators are moving with in the
calibrated range.
Air Temperature Actuator
The air temperature actuator are 5-wire bi-directional
electric motors that incorporate a feedback
potentiometer. Low reference, 5-volt reference, position
signal, and 2 control circuits enable the actuator to
operate. The control circuits use either a 0 or 12-volt
value to coordinate the actuator movement. When the
actuator is at rest, both control circuits have a value of 0
volts. In order to move the actuator, the HVAC control
module grounds one of the control circuits while
providing the other with 12 volts. The HVAC control
module reverses the polarity of the control circuits to
move the actuator in the opposite direction. When the
actuator shaft rotates, the potentiometer's adjustable
contact changes the door position signal between 0-5
volts.
7A-3
Availability
Yes
Yes
Yes
Yes