Suzuki Grand Vitara JB416 / JB420 (ESP model). Manual — part 89
7A-1 Heater and Ventilation:
HVAC
Heater and Ventilation
Schematic and Routing Diagram
Heater and Ventilation Wiring Circuit Diagram
S5JB0E7102001
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.
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