Suzuki Grand Vitara JB419. Service manual — part 125
Air Conditioning System: 7B-6
Component Location
A/C Control System Components Location
S5JB0B7203002
NOTE
The figure shows left-hand steering vehicle. For right-hand vehicle, parts with (*) are installed at the
opposite side.
1
*2
*7
*3
*6
*11
*10
9
8
4
5
22
23
27
25
12
24 26
14
16
15
21
13
17
19
18
20
I5JB0B720004-04
1. Outside temperature sensor
10. Blower motor
19. Theft deterrent light
7B-7 Air Conditioning System:
Diagnostic Information and Procedures
Scan Tool Data
S5JB0B7204006
As the data values given below are standard values estimated on the basis of values obtained from the normally
operating vehicles by using a scan tool, use them as reference values. Even when the vehicles are in good condition,
there may be cases where the checked values do not fall within each specifies data range. Therefore, judgement as
abnormal should not be made by checking with these data alone.
2. Sunload sensor
11. Blower motor controller
20. Blower speed selector / Air intake selector
3. Inside temperature sensor
12. Temperature selector / A/C switch
21. Rear defogger switch
4. ECT sensor
13. “DEF” switch
22. “REC” indicator lamp
5. Refrigerant pressure sensor
14. “DEF / FOOT” switch
23. “FRE” indicator lamp
6. Evaporator temperature sensor
15. “FOOT” switch
24. MODE selector
7. Air intake control actuator
16. “BI-LEVEL” switch
25. HVAC control module (vehicle with A/C)
8. Temperature control actuator
17. “VENT” switch
26. “DEF” indicator lamp
9. Air flow control actuator
18. “AUTO” switch
27. Additional heater assembly
Scan Tool Data
Condition
Normal Condition /
Reference Value
TEMP CONT SWITCH
Each reference value is relative to the position of
temperature selector of HVAC control module.
Max Cool, 18
°C (61 °F) –
28
°C (81 °F), Max Hot
CABIN TEMPERATURE
Reference value is relative to in car temperature.
–40
°C – 87.5 °C
(–40
°F – 189.5 °F)
OUT SIDE AIR TEMP
Reference value is relative to outside air temperature.
–40
°C – 87.5 °C
(–40
°F – 189.5 °F)
EVAPORATOR TEMP
Reference value is relative to temperature of evaporator.
–40
°C – 87.5 °C
(–40
°F – 189.5 °F)
COOLANT TEMP
At specified idle speed after warming up
–40
°C – 215 °C
(–40
°F – 419 °F)
SUN LOAD
Reference value depends on the situation.
0 W/m
2
– 4447.8 W/m
2
MODE CONT SWITCH
Each reference value is relative to the position of airflow
selector of HVAC control module.
AUTO, VENT, BI-LEVEL,
FOOT, DEF-FOOT DEF
FAN CONT SWITCH
Each reference value is relative to the position of blower
speed selector of HVAC control module.
AUTO, OFF 1st, 2nd – 7th,
8th
FAN DESIRE VOLT
Reference value is relative to the position of blower
speed selector of HVAC control module.
0 – 16.0 V
AIR MIX POS SENSOR
Reference value is relative to the position of temperature
selector of HVAC control module.
Approx. 1.5 V (Max Hot)
Approx. 4.5 V (Max Cool)
R/F POS SENSOR
Reference value is relative to the position of air intake
selector of HVAC control module. (LH steering vehicle)
Approx. 4.0 V (REC)
Approx. 0.9 V (FRE)
R/F POS SENSER
Reference value is relative to the position of air intake
selector of HVAC control module. (RH steering vehicle)
Approx. 0.9 V (REC)
Approx. 4.0 V (FRE)
MODE POS SENSOR
Reference value is relative to the position of airflow
selector of HVAC control module.
Approx. 0.5 V (DEF)
Approx. 4.5 V (VENT)
A/C CONT SIG
A/C system is ON.
ON
A/C system is OFF.
OFF
AIR INTAKE MODE
Fresh air (FRE) mode is activated.
FRE
Recirculation air (REC) mode is activated.
REC
AUTO mode is activated.
AUTO
A/C COMP CLUCH
Magnet clutch is engaged.
ON
Magnet clutch is not engaged.
OFF
REFRIGERANT PRESSURE
Engine
running.
A/C system is ON (compressor is operating) at
ambient temperature: 30
°C (86 °F)
For more details, refer to
pressure of high pressure
gauge under “A/C System
A/C system is ON (compressor is not
operating) at ambient temperature: 30
°C (86
°F) and engine coolant temperature: 90 °C –
100
°C (194 °F – 212 °F)
600 – 1000 kPa after
longer than 10 min from A/
C switch turned off.
Air Conditioning System: 7B-8
Scan Tool Data Definitions
TEMP CONT SWITCH: Position of temperature control
selector of HVAC control module
CABIN TEMPERATURE: In-car temperature detected
by inside air temperature sensor installed in HVAC
control module
OUTSIDE AIR TEMP (OUTSIDE AIR
TEMPERATURE): Outside air temperature
detected by outside air temperature sensor installed
in front bumper member
EVAPORATOR TEMP: Temperature of air passed
through evaporator
COOLANT TEMP: Engine coolant temperature
detected by engine coolant temperature sensor
SUN LOAD: Amount of sunlight detected by sunload
sensor installed on the driver side on the dashboard
MODE CONT SWITCH: Position of airflow selector of
HVAC control module
FAN CONT SWITCH: Position of air speed selector of
HVAC control module
FAN DESIRE VOLT: Voltage for blower motor
AIR MIX POS SENSOR: Input signal from position
sensor in temperature control actuator
MODE POS SENSOR: Input signal form position
sensor in air flow control actuator
R/F POS SENSOR (AIR FLOW CONTROL ACTUATOR
POSITION SENSOR): Input signal from position
sensor in air intake control actuator
A/C CONT SIG (ON or OFF): State of A/C indicator
lamp
AIR INTAKE MODE (FRE, REC or MIX): State of air
intake mode
A/C COMP CLUCH: State of magnet clutch
REFRIGERANT PRESSURE (A/C REFRIGERANT
ABSOLUTE PRESSURE): This parameter
indicates A/C refrigerant absolute pressure
calculated by ECM
A/C INDICATOR LAMP (ON or OFF): State of A/C
indicator lamp
FRE INDICATOR LAMP (ON or OFF): State of fresh air
(FRE) indicator lamp
REC INDICATOR LAMP (ON or OFF): State of
recirculation air (REC) indicator lamp
REAR DEF INDICATOR (ON or OFF): State of rear
defogger indicator lamp
VEHICLE SPEED: This parameter indicates vehicle
speed calculated by BCM.
ENGINE SPEED: This parameter indicates engine
speed calculated by ECM.
SUPPLEMENT HT 1 (ON or OFF): State of additional
heater relay No. 1
SUPPLEMENT HT 2 (ON or OFF): State of additional
heater relay No. 2
SUPPLEMENT HT 3 (ON or OFF): State of additional
heater relay No. 3
A/C INDICATOR LAMP
A/C indicator lamp is lighted.
ON
A/C indicator lamp is not lighted.
OFF
FRE INDICATOR LAMP
Fresh air (FRE) indicator lamp is lighted.
ON
Fresh air (FRE) indicator lamp is not lighted.
OFF
REC INDICATOR LAMP
Recirculation air (REC) indicator lamp is lighted.
ON
Recirculation air (REC) indicator lamp is not lighted.
OFF
REAR DEF INDICATOR
Rear defogger indicator lamp is lighted.
ON
Rear defogger indicator lamp is not lighted.
OFF
SUPPLEMENT HT 1
Additional heater relay No.1 is ON.
ON
Additional heater relay No.1 is OFF.
OFF
SUPPLEMENT HT 2
Additional heater relay No.2 is ON.
ON
Additional heater relay No.2 is OFF.
OFF
SUPPLEMENT HT 3
Additional heater relay No.3 is ON.
ON
Additional heater relay No.3 is OFF.
OFF
VEHICLE SPEED
Vehicle stops.
0 km/h (0 mph)
ENGINE SPEED
Engine is running at idle.
Engine idle speed is
display
Scan Tool Data
Condition
Normal Condition /
Reference Value
7B-9 Air Conditioning System:
A/C System Performance Inspection
S5JB0B7204008
1) Confirm that vehicle and environmental conditions
are as follows.
• Vehicle is put indoors.
• Ambient air temperature is within 15 – 35
°C (59 –
95
°F).
• Relative humidity is within 30 – 70%.
• There is no wind indoors.
• HVAC unit is normal condition.
• There is no air leakage from air ducts.
• Condenser fins are clean.
• Are filter is not clogged with dirt and dust.
• Battery voltage is 12 V or more.
• Radiator cooling fan operates normally.
2) Make sure that high pressure valve (1) and low
pressure valve (2) of manifold gauge (3) are firmly
closed.
3) Connect high pressure charging hose (4) to high
pressure service valve (5) on vehicle, and connect
low pressure charging hose (6) to low pressure
service valve (7) on vehicle.
4) Bleed the air in charging hoses by loosening their
respective nuts on manifold gauge, utilizing the
refrigerant pressure. When a hiss is heard,
immediately tighten nut.
WARNING
!
Make sure to connect high and low pressure
charging hoses to correct valves. Connecting
them in the other way around may cause
charging hoses and refrigerant container to
burst.
5) Warm up engine to normal operating temperature
(engine coolant temperature at 80 – 90
°C (176 –
194
°F)) and keep it at specified idle speed.
6) Operate A/C at the following conditions.
• A/C switch at ON position
• Blower speed selector at max position
• Air flow selector at “VENT” position
• Temperature selector at max cool position
• Vehicle door at all open
• Air inlet door at recirculation position
7) Wait for ten minutes to stabilize A/C operation.
8) Keep all windows, doors and engine food open.
9) With about 20 mm (0.8 in.) of dry bulb thermometer
(1) put right in front of center ventilation louver and a
wet and dry bulb thermometer (2) near air inlet (3) of
HVAC unit.
3
4
7
5
1
2
6
I5JB0B720005-02
1
3
2
I5JB0A720011-01
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