Suzuki Grand Vitara JB627. Manual — part 275
7B-16 Air Conditioning System:
Example of “REC” Indicator Light Flashing Pattern
Example of “FRE” Indicator Light Flashing Pattern
NOTE
Locked actuator, data error and refrigerant pressure malfunction are indicated by flashing pattern of
“FRE” indicator light specified for each of them.
[A]
(a)
(b)
(d)
(c)
(e)
(d)
[B]
(a)
(b)
(d)
(c)
(e)
(f)
(f)
(d)
I5JB0A720017-01
[A]: B1503 (No.3)
(b): “REC” indicator light “OFF”
(e): 2.0 (sec.)
[B]: B1556 (No.12)
(c): Time (sec.)
(f): 1.5 (sec.)
(a): “REC” indicator light “ON”
(d): 0.5 (sec.)
[A]: Open
(b): “FRE” indicator light “OFF”
(e): 2.0 (sec.)
[B]: Short
(c): Time (sec.)
(a): “FRE” indicator light “ON”
(d): 0.5 (sec.)
[A]
(a)
(b)
[B]
(a)
(b)
(d)
(e)
(e)
(c)
(d)
(e)
(c)
(d)
(d)
I5JB0A720018-01
Air Conditioning System: 7B-17
Display Timing of “FRE” Indicator Light and “REC” Indicator Light
Code with short display time waits until display of code with long display time is over.
Fail-Safe Table
S6JB0B7204005
When any of the following malfunctions (DTCs) is detected, HVAC control module enters fail-safe mode.
However, when HVAC control module detects normal operation of A/C system, fail-safe mode is canceled.
[A]: B1520 (15 – 1)
(a): “REC” indicator flashing pattern
[B]: B1562 (1 – 4)
(b): “FRE” indicator flashing pattern
DTC No.
Trouble Area
Fail-Safe Operation
When ignition switch is turned
ON after malfunction is already
detected
When malfunction is detected during
ignition switch is ON
B1502
Inside air temperature
sensor and/or its circuit
malfunction
HVAC control module controls actuators assuming that inside air
temperature is 25
°C (77 °F).
B1503
Evaporator temperature
sensor and/or its circuit
malefaction
HVAC control module controls actuators assuming that amount of
evaporator temperature is –6
°C (21.2 °F).
B1504
Sunload sensor and/or its
circuit malfunction
HVAC control module controls actuators assuming that amount of sunlight
is 0 W/m
2
.
B1511
Temperature control
actuator (position sensor)
and/or its circuit malfunction
Circuit open: Temperature control actuator fixed to “MAX HOT” position.
Circuit short: Temperature control actuator fixed to “MAX HOT” position.
B1512
Air flow control actuator
(position sensor) and/or its
circuit malfunction
Circuit open: Air flow control actuator fixed to “DEF” position.
Circuit short: Air flow control actuator fixed to “DEF” position.
B1513
Temperature control
actuator and/or its circuit
malfunction
Stop the operation of temperature control actuator.
B1514
Air flow control actuator
and/or its circuit malfunction
Stop the operation of Air flow control actuator.
B1520
Temperature selector
malfunction
HVAC control module keeps
condition just before malfunction is
detected.
HVAC control module controls
actuators assuming that setting of
temperature selector is 25
°C (77 °F).
B1521
Blower speed selector
malfunction
HVAC control module keeps
condition just before malfunction is
detected.
HVAC control module controls
actuators assuming that as follows.
• Blower speed is minimum.
• Air flow control actuator fixed to
“DEF” position.
B1530
Air intake control actuator
(position sensor) and/or its
circuit malfunction
Circuit open: Air intake control actuator fixed to “FRE” position.
Circuit short: Air intake control actuator fixed to “FRE” position.
B1531
Air intake control actuator
and/or its circuit malfunction
Stop the operation of temperature control actuator.
[A]
(a)
(b)
[B]
(a)
(b)
I5JB0A720019-02
7B-18 Air Conditioning System:
Scan Tool Data
S6JB0B7204006
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.
B1551 Serial communication circuit
malfunction
HVAC control module keeps
condition just before malfunction is
detected.
HVAC control module controls
actuators assuming that as follows.
• Outside air temperature is 20
°C (68
°F).
• Engine coolant temperature is 90
°C
(194
°F).
• Vehicle speed is 0 km/h (0 mph).
• Engine speed is 0 rpm.
B1552
B1553
CAN communication circuit
malfunction
B1556
Camshaft position (CMP)
sensor and/or its circuit
malfunction
HVAC control module keeps
condition just before malfunction is
detected.
HVAC control module controls
actuators assuming that amount of
engine speed is 0 rpm.
B1557
Vehicle speed sensor and/
or its circuit malfunction
HVAC control module keeps
condition just before malfunction is
detected.
HVAC control module controls
actuators assuming that amount of
vehicle speed is 0 km/h (0 mph).
B1561
Engine coolant temperature
sensor and/or its circuit
malfunction
HVAC control module keeps
condition just before malfunction is
detected.
HVAC control module controls
actuators assuming that amount of
engine coolant temperature is 90
°C
(194
°F).
B1562
Outside air temperature
sensor and/or its circuit
malfunction
HVAC control module keeps
condition just before malfunction is
detected.
HVAC control module controls
actuators assuming that amount of
outside air temperature is 20
°C (68 °F).
DTC No.
Trouble Area
Fail-Safe Operation
When ignition switch is turned
ON after malfunction is already
detected
When malfunction is detected during
ignition switch is ON
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, 20
°C (65 °F)
– 30
°C (85 °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)
Air Conditioning System: 7B-19
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
light
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 LIGHT (ON or OFF): State of A/C
indicator light
FRE INDICATOR LIGHT (ON or OFF): State of fresh
air (FRE) indicator light
REC INDICATOR LIGHT (ON or OFF): State of
recirculation air (REC) indicator light
REAR DEF INDICATOR (ON or OFF): State of rear
defogger indicator light
VEHICLE SPEED: It is computed based on pulse
signals from vehicle speed sensor
ENGINE SPEED: It is computed by signal from CMP
sensor
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 ON (A/C is operating) at ambient
temperature: 30
°C (86 °F)
1350 – 1650 kPa for more
details, refer to pressure of
high pressure gauge under
A/C ON (A/C 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.
A/C INDICATOR LIGHT
A/C indicator light is lighted.
ON
A/C indicator light is not lighted.
OFF
FRE INDICATOR LIGHT
Fresh air (FRE) indicator light is lighted.
ON
Fresh air (FRE) indicator light is not lighted.
OFF
REC INDICATOR LIGHT
Recirculation air (REC) indicator light is lighted.
ON
Recirculation air (REC) indicator light is not lighted.
OFF
REAR DEF INDICATOR
Rear defogger indicator light is lighted.
ON
Rear defogger indicator light is not lighted.
OFF
VEHICLE SPEED
At stop.
0 km/h (0 mph)
ENGINE SPEED
At engine idle speed
Engine idle speed is
display
Scan Tool Data
Condition
Normal Condition /
Reference Value
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