Cooling System Description SUZUKI SX4 2006 1.G Service User Guide

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 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