Precautions On Servicing Compressor Assembly; General Description; Auto A/C System Description; Hvac Control System Description - Suzuki GRAND VITARA Owner's Manual

Precautions on Servicing Compressor Assembly

CAUTION
!
• None of refrigerant, compressor oil and component parts is interchangeable between two types of
A/C: one using CFC-12 (R-12) and the other using HFC-134a (R-134a).
For identification between these two types, refer to "A/C Refrigerant Type Description: ".
When replenishing or changing refrigerant and compressor oil and when replacing parts, make sure
that the material or the part to be used is appropriate to the A/C installed in the vehicle being
serviced. Use of incorrect refrigerant or compressor oil will result in leakage of refrigerant, damage
in parts or other faulty condition.
• When servicing the compressor, keep dirt or foreign material away from getting on or into the
compressor parts and system. Clean tools and a clean work area are important for proper service.
The compressor connection and the outside of the compressor should be cleaned before any "On-
vehicle" repair or before removal of the compressor. The parts must be kept clean at all times and
any parts to be reassembled should be cleaned with trichloromethane, naphtha, kerosene or
equivalent solvent and dried with dry air. Use only lint free cloths to wipe parts.
• When compressor is removed from the vehicle for servicing, the oil remaining in the compressor
should be discarded and new refrigerant oil added to the compressor.
Minor repair procedures may be done on the vehicle without discharging the system. Major repair
procedures require that the system be discharged of refrigerant.

AUTO A/C System Description

The automatic air conditioning system (auto A/C), HVAC
control module automatically controls inside air
temperature, blower speed, airflow outlet and so forth.
Once users set up desired inside air temperature with
the temperature control selector, select "AUTO" position
of blower speed selector and push auto A/C switch,
HVAC control module detects inside air temperature,
outside air temperature, amount of sunlight, and engine
coolant temperature by means of inside air temperature
sensor, outside air temperature sensor, sunload sensor,
and engine coolant temperature (ECT) sensor
respectively.
Then, HVAC control module keeps desired in-car
temperature at any time.
Then, HVAC control module keeps in-car temperature at
desired level and auto A/C indicator lamp of HVAC
control module turns on.

General Description

HVAC Control System Description

S5JB0A7201004
For CAN communication system, refer to description on
"CAN Communication System Description: in Section
1A".
When following data are sent from control modules to
BCM through CAN communication, they are sent from
BCM to HVAC control module through serial
communication line.
• Engine coolant temperature
• Engine speed
• A/C refrigerant pressure
• Vehicle Speed (wheel speed)
• Outside air temperature
Based on above data, HVAC control module sends A/C
compressor ON / OFF request signal to BCM through
serial communication line.
BCM sends this signal through CAN communication to
ECM which then causes compressor relay to turn ON /
OFF.
For more information on signal transmission and
reception of Auto A/C system, refer to "Auto A/C
Electronic Control Input / Output Table: ".
HVAC control module has a function to make initial
settings of temperature control actuator, air intake
actuator and air flow actuator.
Initial settings of actuators are automatically made when
engine is started for the first time after battery is
connected.
When initial settings are made, each actuator is forced to
operate for about 15 seconds continuously.
Air Conditioning System:
S5JB0A7200002
S5JB0A7201005
7B-4