Suzuki Grand Vitara JB416 / JB420 (ESP model). Service manual - part 89

7A-1 Heater and Ventilation: 

HVAC

Heater and Ventilation

Schematic and Routing Diagram

Heater and Ventilation Wiring Circuit Diagram

S5JB0E7102001

Refer to “A/C System Wiring Circuit Diagram in Section 7B”.

Air Conditioning System:  7B-1

HVAC

Air Conditioning System

Schematic and Routing Diagram

Auto A/C Electronic Control Input / Output Diagram

S5JB0E7202003

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

*

*

I5JB0D720002-01

*: CAN communication

7B-2 Air Conditioning System: 

A/C System Wiring Circuit Diagram

S5JB0E7202001

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

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

8

44

9

10

11

12

13

14

15

5V

I5JB0A720007-05

1. Battery

17. Compressor relay

33. Refrigerant pressure sensor

2. Main fuse

18. Rear defogger relay

34. To fuse box

3. Fuse box

19. Blower motor relay

35. Theft deterrent light 

4. To radiator fan relay No.1

20. Rear defogger

36. Illumination lamp

5. To radiator fan relay No.3

21. A/C compressor

37. Indicator lamp, switch, selector

6. Ignition switch

22. Blower motor

38. To wheel speed sensor

7. Small lamp relay

23. Blower motor selector

39. To information display

Air Conditioning System:  7B-3

Diagnostic Information and Procedures

DTC B1553: CAN Communication Circuit Malfunction

S5JB0E7204026

DTC Detecting Condition and Trouble Area

DTC Troubleshooting

8. To BCM

24. Radiator fan relay No.1

40. To ECM

9. Evaporator temperature sensor

25. Radiator fan No.1

41. To BCM

10. Inside air temperature sensor

26. Radiator fan relay No.2

42. To compressor relay

11. Temperature control actuator

27. Radiator fan relay No.3

43. To rear defogger relay

12. Air intake control actuator

28. Radiator fan No.2

44. To combination switch

13. Air flow control actuator

29. ECM

45. AUTO-ON head light system vehicle

14. Sunload sensor

30. Outside temperature sensor

*: M16 engine model

15. Data link connector

31. ABS/ESP

® control module

16. HVAC control module

32. BCM

DTC detecting condition

Trouble area

HVAC control module receives error code from BCM continuously.

• CAN communication circuit
• Steering angle sensor (if equipped)
• Keyless start control module (if 

equipped)

• 4WD control module (if equipped)
• TCM (if equipped)
• Combination meter
• ABS/ESP

® control module

• BCM
• HVAC control module
• ECM

Step

Action

Yes

No

1

DTC check
1) Connect scan tool to DLC with ignition switch turned 

OFF.

2) Check ECM and BCM for DTC.

Is there DTC(s)?

Go to applicable DTC 
diag. flow.

Substitute a known-
good HVAC control 
module and recheck.