Suzuki Grand Vitara JB416 / JB420 / JB419. Service manual - part 379

7B-7 Air Conditioning System: 

Sub-Cool A/C System Description

S6JB0A7201006

In the sub-cool A/C system (condenser (3) integrated with receiver / dryer (4)), the inside of the condenser is divided 
into the condensation part and the sub-cooler part, and the receiver / dryer is located between those. In the receiver / 
dryer (4), the refrigerant is separated into the vapor refrigerant and the liquid refrigerant. Only the liquid refrigerant is 
delivered to the sub-cooler part of the condenser. The refrigerant is supercooled by the sub-cooler part of the 
condenser.

I5JB0A720006-02

[A]: Liquid

4. Receiver / dryer

10. Desiccant

[B]: Vapor

5. Refrigerant pressure sensor

11. Filter

[C]: Superheated vapor

6. Expansion valve

12. Vapor refrigerant

1. Compressor

7. Evaporator

13. Liquid refrigerant

2. Magnet clutch

8. Condensation part

3. Condenser

9. Sub-cooler part

Air Conditioning System:  7B-8

A/C Evaporator Temperature Sensor 
Description

S6JB0A7201007

The A/C evaporator temperature sensor (1) is a 
temperature sensor to sense the temperature of air 
discharged from evaporator. 

The electrical characteristic is shown.

When temperature is lower than specified, A/C controller 
makes magnet clutch turn off to prevent evaporator from 
frosting.

On-Board Diagnostic System Description

S6JB0A7201008

HVAC control module detects malfunction, which may 
occur in the following area. When HVAC control module 
detects any malfunction, the REC (recirculation) 
indicator lamp (3) flashes on and off continuously after 
turning ignition switch to ON position.
Abnormality exists (when air intake selector is operated 
while “REC” indicator lamp is flashing), “FRE” indicator 
lamp lights for 15 seconds and then “REC” indicator 
lamp flashes.

• Outside temperature sensor
• Inside temperature sensor
• Sunload sensor (Short circuit)
• Wheel speed sensor
• CMP sensor
• CAN communication line
• Serial communication line
• A/C evaporator temperature sensor
• ECT sensor
• Temperature control actuator
• Air flow control actuator
• Air intake control actuator
• Temperature selector of HVAC control module
• Blower speed selector of HVAC control module
DTC can be checked by either one of the following ways.
• DTC can be checked by using SUZUKI scan tool (2) 

connected to DLC (1).

• Without using SUZUKI scan tool, DTC can be 

checked by reading the flashing pattern of both the 
FRE (fresh air) indicator lamp (3) and the REC 
(recirculation) indicator lamp (4).

• Current DTC and history DTC by pushing DEF 

(defogger) switch (5) when DTC displayed by HVAC 
control module.

• History DTC is such DTC which HVAC control module 

saves in its memory when it detects current DTC for 
60 seconds or more continuously.

• During indication of current DTC, DEF (defogger) 

indicator lamp (6) is OFF. However DEF indicator 
lamp (6) is ON during indication of history DTC.

1

I5JB0A720089-02

(k

Ω

)

11.4

3.9
3.3

0

32

25
77

30
86

(˚C)

(˚F)

Resistance

Temperature

I5JB0A720090-03

3

4

5

6

1

2

I5JB0A720093-03

7B-9 Air Conditioning System: 

Schematic and Routing Diagram

Air Flow Diagram of A/C System

S6JB0A7202002

Auto A/C Electronic Control Input / Output Diagram

S6JB0A7202003

13

13

14

14

15

15

7

2

12

11

1

3

11

9

10

4

8

5

6

16

17

I5JB0A720008-02

1. HVAC unit

7. Expansion valve

13. Defroster air

2. Evaporator

8. Liquid pipe

14. Demister air

3. Blower fan motor

9. Suction pipe

15. Foot air

4. Compressor

10. Discharge pipe

16. Ventilation air

5. Condenser assembly

11. Recirculation air

17. Heater core

6. Receiver / dryer

12. Fresh air

Sunload sensor

Outside air temperature sensor

Evaporator temperature sensor

A/C refrigerant pressure sensor

Temperature selector
MODE (air flow) selector
Blower speed selector
Air intake selector

AUTO switch

A/C switch

Compressor relay

Blower motor controller

Temperature control actuator

Air flow control actuator

Air intake control actuator

BCM

ECM

Data link connector

HVAC control module

CPU

ECT sensor

Inside air temperature sensor

ABS control module or 
ESP® control module

Wheel 

speed 
sensor

Radiator fan relay

Additional heater relay

*

*

(diesel engine model)

I6JB0A720001-01

*: CAN communication

Air Conditioning System:  7B-10

A/C System Wiring Circuit Diagram

S6JB0A7202001

12V

5V

M

12V

M

5V

5V

M

12V

12V

G52-1

G52-2

G52-8

G52-4

G52-15

G52-19

G52-20

12V

M

5V

5V

G52-21

G52-22

G52-23

G52-27

G52-28

G52-31

G52-32

G52-29

G52-30

G52-14

5V

5V

G52-18

G52-12

5V

12V

12V

5V

G52-13

G52-16

12V

5V

5V

12V

+BB

G52-17

G52-3

PPL/RED

WHT

RED/YEL

RED/WHT

WHT/BLK

BLU/BLK

BLK/RED

GRY

GRY/BLU

BLK/RED

WHT/RED

RED/WHT

ORN

GRN

RED/WHT

WHT/GRN

BLK/RED

GRY/RED

GRY/BLK

RED/WHT

WHT/BLU

BLK/RED

PNK

YEL

PPL/WHT

BLK

BLK/RED

RED/BLK

PPL/GRN

G52-10

G52-11

G52-6

G52-5

YEL/RED

PNK/GRN

PNK/BLK

RED/GRN

WHT/BLK

GRY/GRN

GRY/RED

GRY/BLK

M

M

RED/YEL

RED

RED/BLK

BLU/WHT

BLK

WHT/RED

BLK/RED

BLU/BLK

PNK

YEL/GRN

YEL/GRN

YEL/GRN

RED/GRN

*RED

BLU

BLU/WHT

BLU/BLK

RED

WHT

WHT/RED
WHT/BLU

BLK/RED

3

[A]

2

1

4

17

18

19

40

41

20

37

21

22

23

24

34

34

25

29

30

42

31

38

39

32

33

43

45

35

36

16

26

27

28

5

6

7

41

44

9

10

11

12

13

14

15

5V

I6JB0A720003-01