2006 SUZUKI SX4 Engine Cooling System

Downloaded from www.Manualslib.com manuals search engine Air Conditioning System: Automatic Type 7B-39
General Description
Auto A/C System DescriptionS6RW0D7221001
The automatic type air conditioning system (auto A/C) is provided with the function to automatically control the inside
air temperature, fan speed, air flow outlet direction and air intake position by HVAC control module in addition to
functions of the manual type air conditioning system (manual A/C). Once the inside air temperature is set using the
temperature selector, HVAC control module automatically controls the inside air temperature at the constant level at all
times based on the inside air temperature, outside air temperature, amount of sunlight and engine coolant
temperature detected respectively by the inside air temperature sensor, outside air temperature sensor, sunload
sensor and ECT sensor. For the electronic control system components location, refer to “Electronic Control System
Components Location”. For the A/C system components location, refer to “A/C System Major Components Location”.
Auto A/C Electronic Control Input / Output Table
Temperature selector
MODE (air flow) selector
Blower speed selector
Air intake selector
AUTO switch A/C switch
Outside air
temperature
sensor
A/C refrigerant pressure sensor
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
Sunload sensor
Inside air temperature sensor
Evaporator temperature sensor
Condenser cooling fan relay
Wheel
speed
sensor
*
*
*
Combination meterABS control module
I6RW0C722001-01
*: CAN communication

Downloaded from www.Manualslib.com manuals search engine 7B-40 Air Conditioning System: Automatic Type
HVAC Control DescriptionS6RW0D7221002
Temperature Control
HVAC control module calculates the target temperature
control door position based on signals from the
temperature selector, inside air temperature sensor,
outside air temperature sensor and sunload sensor and
controls the temperature control actuator so that the
current position of the temperature control door matches
its target position.
Fan Speed Control
HVAC control module calculates the target blower fan
speed based on signals from the temperature selector,
inside air temperature sensor, outside air temperature
sensor, ECT sensor and sunload sensor, compares it
with the current blower fan speed inputted from the
blower motor controller to control the current blower fan
speed to the target level.
Air Flow Outlet Control
HVAC control module calculates the target temperature
control door position based on signals from the
temperature selector, inside air temperature sensor,
outside air temperature sensor, ECT sensor and sunload
sensor. Using thus obtained target temperature control
door position, it further calculates the target air flow
control door position and controls the air flow control
actuator so that the current air flow control door position
becomes the target position.
Air Intake Position Control
HVAC control module determines the position of the air
intake control door based on signals from the
temperature selector, inside air temperature sensor,
outside air temperature sensor and sunload sensor and
selects any of the following positions by controlling the
position of the air intake control door.
• FRESH position (FRE)
• RECIRCULATION position (REC)
• MIX position (MIX)A/C Compressor Relay Control
HVAC control module outputs A/C switch ON signal to
ECM via BCM when the vehicle state satisfy conditions
described below.
• A/C switch is ON
• Evaporator temperature is higher than specified value
• Evaporator temperature sensor malfunction is not
detected
Communication of ECM and BCM is established by CAN
(Controller Area Network). (For more detail of CAN
communication, refer to “CAN Communication System
Description in Section 1A”).
ECM turns ON the A/C compressor relay when the
vehicle state satisfy conditions described below.
• A/C switch ON signal is inputted
• A/C refrigerant pressure is within specified range
• Engine speed is within specified range
• Engine coolant temperature is lower than specified
value
• Throttle opening is lower than specified value
• Vehicle is not in either state of starting or quick
acceleration
• ECT sensor malfunction is not detected
• A/C refrigerant pressure sensor malfunction is not
detected
Condenser Cooling Fan Relay Control
ECM turn ON the condenser cooling fan relay at the
same time when ECM turn ON the A/C compressor
relay.
Sub-Cool A/C System DescriptionS6RW0D7221003
Refer to “Sub-Cool A/C System Description”.

Downloaded from www.Manualslib.com manuals search engine Air Conditioning System: Automatic Type 7B-43
Component Location
A/C System Major Components LocationS6RW0D7223001
Refer to “A/C System Major Components Location”.
[A]: Illumination control model 10. Air intake actuator 22. Compressor 34. “A/C” indicator light
[B]: Junction block with BCM 11. Air flow control actuator 23. HVAC control module 35. Rear defogger switch
[C]: Junction block without BCM 12. Temperature control actuator 24. BCM 36. Rear defogger indicator
1. Main fuse box 13. Inside air temperature sensor 25. A/C refrigerant pressure sensor 37. To other control module
2. Ignition switch 14. Outside air temperature sensor 26. Condenser cooling fan relay 38. Indicator light, switch,
selector
3. CAN junction connector 15. Evaporator temperature sensor 27. Information display 39. “FRE” indicator light
4. Rear defogger relay 16. Sunload sensor 28. Lighting switch 40. “REC” indicator light
5. Rear defogger 17. Junction block assembly 29. A/C switch 41. Temperature selector
6. Blower motor relay 18. ECM 30. Air intake selector 42. Blower speed selector
7. Blower motor 19. ECT sensor 31. To BCM 43. MODE (air flow) selector
8. Blower motor controller 20. Condenser cooling fan motor 32. ABS control module 44. Tail light
9. DLC 21. Compressor relay 33. Illumination light 45. Main relay

Downloaded from www.Manualslib.com manuals search engine 7B-44 Air Conditioning System: Automatic Type
Electronic Control System Components LocationS6RW0D7223002
NOTE
The figure shows left-hand steering vehicle. For right-hand steering vehicle, parts with (*) are installed
at the opposite side.

[A]
2
3
5
1
4
78*
18
19
20
23
22 219*
10*
11*
12*
13*
15* 16* 17
14*
8*6
I6RW0C722003-01
[A]: Junction block assembly viewed from relay
side8. Junction block assembly 16. Blower motor controller
1. A/C refrigerant pressure sensor 9. Sunload sensor 17. HVAC control module
2. Compressor relay 10. Inside air temperature sensor 18. Temperature selector
3. Condenser cooling fan relay 11. Air flow control actuator 19. Blower speed selector
4. Outside air temperature sensor 12. Temperature control actuator 20. MODE (air flow) selector
5. ECT sensor 13. Evaporator temperature sensor 21. A/C switch
6. Condenser cooling fan 14. Air intake actuator 22. Air intake selector
7. Blower motor relay 15. Blower motor 23. Rear defogger switch

Downloaded from www.Manualslib.com manuals search engine Air Conditioning System: Automatic Type 7B-47
A/C System Symptom DiagnosisS6RW0D7224002
Condition Possible cause Correction / Reference Item
No cool air comes out (A/
C system does not
operate)No refrigerantPerform recovery, evacuation and charge
referring to “Operation Procedure for
Refrigerant Charge”.
Fuse blownCheck related fuses, and then check for short
circuit to ground.
A/C switch faultyCheck A/C switch referring to “Inspection of
HVAC Control Module and Its Circuit”.
Evaporator temperature sensor faultyCheck evaporator temperature sensor
referring to “Evaporator Temperature Sensor
Inspection”.
A/C refrigerant pressure sensor faultyCheck A/C refrigerant pressure sensor
referring to “A/C Refrigerant Pressure Sensor
and Its Circuit Inspection”.
Wiring or grounding faultyRepair as necessary.
ECM faultyCheck ECM referring to “A/C System
Inspection at ECM”.
HVAC control module faultyCheck HVAC control module referring to
“Inspection of HVAC Control Module and Its
Circuit”.
Magnet clutch faultyCheck magnet clutch referring to “Magnet
Clutch Inspection”.
Compressor drive belt loosened or
brokenAdjust or replace drive belt.
Compressor faultyCheck compressor.
Compressor relay faultyCheck compressor relay referring to “A/C
System Relay Inspection”.
BCM faultyCheck BCM referring to “Inspection of BCM
and Its Circuits in Section 10B”.
No cool air comes out
(radiator cooling fan
motor does not operate)Fuse blownCheck related fuses, and then check for short
circuit to ground.
Wiring or grounding faultyRepair as necessary.
Condenser cooling fan motor relay faultyCheck condenser cooling fan motor relay
referring to “A/C System Relay Inspection”.
Condenser cooling fan motor faultyCheck condenser cooling fan motor referring to
“Condenser Cooling Fan Inspection”.
ECM faultyCheck ECM referring to “A/C System
Inspection at ECM”.
HVAC control module faultyCheck HVAC control module referring to
“Inspection of HVAC Control Module and Its
Circuit”.
No cool air comes out
(blower motor does not
operate)Fuse blownCheck related fuses, and then check for short
circuit to ground.
Blower motor controller faultyCheck blower motor controller referring to
“Blower Motor Controller Inspection”.
HVAC control module faultyCheck HVAC control module referring to
“Inspection of HVAC Control Module and Its
Circuit”.
Wiring or grounding faultyRepair as necessary.
Blower motor faultyCheck blower motor referring to “Blower Motor
Inspection in Section 7A”.
Blower motor relay faultyCheck blower motor relay referring to “Blower
Motor Relay Inspection in Section 7A”.

Downloaded from www.Manualslib.com manuals search engine 7B-48 Air Conditioning System: Automatic Type
Cool air does not come
out or insufficient cooling
(A/C compressor normal
operation)Insufficient or excessive charge of
refrigerantCheck the amount of refrigerant and system
for leaks.
Condenser cloggedCheck condenser referring to “Condenser
Assembly On-Vehicle Inspection”.
A/C evaporator clogged or frostedCheck A/C evaporator and evaporator
temperature sensor referring to “Evaporator
Inspection” and “Evaporator Temperature
Sensor Inspection”.
Evaporator temperature sensor faultyCheck evaporator temperature sensor
referring to “Evaporator Temperature Sensor
Inspection”.
Expansion valve faultyCheck expansion valve referring to “Expansion
Valve Inspection”.
Desiccant cloggedCheck desiccant and cap with filter.
Compressor drive belt loosened or
brokenAdjust or replace drive belt.
Magnet clutch faultyCheck magnet clutch referring to “Magnet
Clutch Inspection”.
Compressor faultyCheck compressor.
Air in A/C systemReplace condenser, and then perform
evacuation and charge referring to “Operation
Procedure for Refrigerant Charge”.
Air leaking from HVAC unit or air ductRepair as necessary.
Heater and ventilation system faultyCheck HVAC unit.
HVAC control module faultyCheck HVAC control module referring to
“Inspection of HVAC Control Module and Its
Circuit”.
Temperature control actuator faultyCheck temperature control actuator referring to
“Temperature Control Actuator and Its Circuit
Inspection”.
Blower motor faultyCheck blower motor referring to “Blower Motor
Inspection in Section 7A”.
Excessive compressor oil in A/C systemDrain excessive compressor oil from A/C
system circuit and compressor.
Cool air does not come
out only intermittentlyWiring connection faultyRepair as necessary.
Expansion valve faultyCheck expansion valve referring to “Expansion
Valve Inspection”.
Excessive moisture in A/C systemReplace condenser, and then perform
evacuation and charge referring to “Operation
Procedure for Refrigerant Charge”.
Magnet clutch faultyCheck magnet clutch referring to “Magnet
Clutch Inspection”.
Excessive amount of refrigerantCheck the amount of refrigerant.
Cool air comes out only at
high speedCondenser cloggedCheck condenser referring to “Condenser
Assembly On-Vehicle Inspection”.
Insufficient charge of refrigerantCheck the amount of refrigerant and system
for leaks.
Air in A/C systemReplace condenser, and then perform
evacuation and charge referring to “Operation
Procedure for Refrigerant Charge”.
Compressor drive belt loosened or
brokenAdjust or replace drive belt.
Compressor faultyCheck compressor.
Cool air does not come
out only at high speedExcessive amount of refrigerantCheck the amount of refrigerant.
A/C evaporator frostedCheck A/C evaporator and evaporator
temperature sensor referring to “Evaporator
Inspection” and “Evaporator Temperature
Sensor Inspection”. Condition Possible cause Correction / Reference Item

Downloaded from www.Manualslib.com manuals search engine Air Conditioning System: Automatic Type 7B-87
Condenser Cooling Fan Relay InspectionS6RW0D7226020
Refer to “A/C System Relay Inspection”.
Condenser Cooling Fan Removal and
Installation
S6RW0D7226021
Refer to “Condenser Cooling Fan Removal and
Installation”.
Condenser Cooling Fan InspectionS6RW0D7226022
Refer to “Condenser Cooling Fan Inspection”.
Condenser Assembly On-Vehicle InspectionS6RW0D7226023
Refer to “Condenser Assembly On-Vehicle Inspection”.
Condenser Assembly Removal and InstallationS6RW0D7226024
Refer to “Condenser Assembly Removal and
Installation”.
Evaporator InspectionS6RW0D7226025
Refer to “Evaporator Inspection”.
Evaporator Temperature Sensor Removal and
Installation
S6RW0D7226026
Refer to “Evaporator Temperature Sensor Removal and
Installation”.
Evaporator Temperature Sensor InspectionS6RW0D7226027
Refer to “Evaporator Temperature Sensor Inspection”.
Expansion Valve Removal and InstallationS6RW0D7226028
Refer to “Expansion Valve Removal and Installation”.
Expansion Valve InspectionS6RW0D7226029
Refer to “Expansion Valve Inspection”.
A/C Refrigerant Pressure Sensor and Its Circuit
Inspection
S6RW0D7226030
Refer to “A/C Refrigerant Pressure Sensor and Its Circuit
Inspection”.
A/C Refrigerant Pressure Sensor Removal and
Installation
S6RW0D7226031
Refer to “A/C Refrigerant Pressure Sensor Removal and
Installation”.
Compressor Relay InspectionS6RW0D7226032
Refer to “A/C System Relay Inspection”.
Compressor Drive Belt Inspection and
Adjustment
S6RW0D7226033
Refer to “Compressor Drive Belt Inspection and
Adjustment”.
Compressor Drive Belt Removal and
Installation
S6RW0D7226034
Refer to “Compressor Drive Belt Removal and
Installation”.
Compressor Assembly Removal and
Installation
S6RW0D7226035
Refer to “Compressor Assembly Removal and
Installation”.
Compressor Assembly ComponentsS6RW0D7226036
Refer to “Compressor Assembly Components”.
Magnet Clutch Removal and InstallationS6RW0D7226037
Refer to “Magnet Clutch Removal and Installation”.
Magnet Clutch InspectionS6RW0D7226038
Refer to “Magnet Clutch Inspection”.
Thermal Switch InspectionS6RW0D7226039
Refer to “Thermal Switch Inspection”.
Thermal Switch Removal and InstallationS6RW0D7226040
Refer to “Thermal Switch Removal and Installation”.
Relief Valve InspectionS6RW0D7226041
Refer to “Relief Valve Inspection”.

Downloaded from www.Manualslib.com manuals search engine Table of Contents 9- i
9
Section 9
CONTENTS
Body, Cab and Accessories
Precautions ................................................. 9-1
Precautions............................................................. 9-1
Precautions on Body, Cab and Accessories ......... 9-1
Precautions for Body Service ................................ 9-1
Fastener Caution for Body Service ....................... 9-1
Wiring Systems........................................ 9A-1
Precautions........................................................... 9A-1
Cautions in Body Electrical System Servicing..... 9A-1
General Description ............................................. 9A-1
Abbreviations ...................................................... 9A-1
Wire / Connector Color Symbols ......................... 9A-1
Symbols and Marks ............................................ 9A-2
How to Read Connector Layout Diagram ........... 9A-4
How to Read Connector Codes and Terminal
Nos.................................................................... 9A-5
How to Read Ground Point ................................. 9A-8
How to Read Power Supply Diagram.................. 9A-9
How to Read System Circuit Diagram................. 9A-9
Connector Layout Diagram ............................... 9A-11
Connector Layout Diagram ............................... 9A-11
Engine Compartment ........................................ 9A-11
Instrument Panel ............................................... 9A-19
Door, Roof......................................................... 9A-25
Floor .................................................................. 9A-28
Rear .................................................................. 9A-32
Ground Point ...................................................... 9A-33
Ground (earth) Point ......................................... 9A-33
Power Supply Diagram ...................................... 9A-34
Power Supply Diagram ..................................... 9A-34
Fuses and the Protected Parts ......................... 9A-36
Fuses in Main Fuse Box ................................... 9A-36
Individual Circuit Fuse Box No. 1 ...................... 9A-37
Individual Circuit Fuse Box No. 2 (In J/B
(Except Taiwan)) ............................................. 9A-38
Individual Circuit Fuse Box No. 2 (In J/B
(Taiwan)) ......................................................... 9A-40
Junction Block (J/B) Connector / Fuse Layout .. 9A-42
Junction Block Inner Circuit (Overview
(Except Taiwan)) ............................................. 9A-43
Junction Block Inner Circuit (Detail (Except
Taiwan)) .......................................................... 9A-45
Junction Block Inner Circuit (Overview
(Taiwan)) ......................................................... 9A-50Junction Block Inner Circuit (Detail (Taiwan)) ... 9A-52
System Circuit Diagram.....................................9A-57
System Circuit Diagram .................................... 9A-57
A-1 Cranking System Circuit Diagram .............. 9A-58
A-2 Charging System Circuit Diagram .............. 9A-59
A-3 Ignition System Circuit Diagram (M15A
engine, M16A engine) ..................................... 9A-60
A-3 Ignition System Circuit Diagram (J20A
engine) ............................................................ 9A-61
A-4 Cooling System Circuit Diagram (M15A
engine, M16A engine) ..................................... 9A-62
A-4 Cooling System Circuit Diagram (J20A
engine) ............................................................ 9A-63
A-5 Engine and A/C Control System Circuit
Diagram (M15A engine) .................................. 9A-64
A-5 Engine and A/C Control System Circuit
Diagram (M16A engine) .................................. 9A-68
A-5 Engine and A/C Control System Circuit
Diagram (J20A engine) ................................... 9A-72
A-6 A/T Control System Circuit Diagram........... 9A-76
A-7 Immobilizer System Circuit Diagram .......... 9A-78
A-8 Body Control System Circuit Diagram
(Except Taiwan) .............................................. 9A-79
A-8 Body Control System Circuit Diagram
(Taiwan) .......................................................... 9A-83
A-10 4WD Control System (Except Taiwan) ..... 9A-87
B-1 Windshield Wiper and Washer Circuit
Diagram........................................................... 9A-88
B-2 Rear Wiper and Washer Circuit Diagram
(Except Taiwan) .............................................. 9A-89
B-2 Rear Wiper and Washer Circuit Diagram
(Taiwan) .......................................................... 9A-90
B-3 Rear Defogger Circuit Diagram (Except
Taiwan) ........................................................... 9A-91
B-3 Rear Defogger Circuit Diagram (Taiwan) ... 9A-92
B-4 Power Window Circuit Diagram .................. 9A-93
B-5 Power Door Lock Circuit Diagram (Except
Taiwan) ........................................................... 9A-95
B-5 Power Door Lock Circuit Diagram
(Taiwan) .......................................................... 9A-97
B-6 Power Mirror Circuit Diagram (Except
Taiwan) ........................................................... 9A-99
B-6 Power Mirror Circuit Diagram (Taiwan) .... 9A-100
B-7 Horn Circuit Diagram ................................ 9A-101
B-8 Seat Heater Circuit Diagram..................... 9A-102