2000 SUZUKI SWIFT ECT wiring

HEATER AND VENTILATION 1A-1
6F1
6F2
6G
1A
6K
7A
7A1
7B1
7C1
7D
7E
7F
8A
8B
8C
8D
8E
9
10
10A
10B
SECTION 1A
HEATER AND VENTILATION
CONTENTS
GENERAL DESCRIPTION .............................. 1A-2
DIAGNOSIS ..................................................... 1A-3
DIAGNOSIS TABLE ..................................... 1A-3
WIRING CIRCUIT ........................................ 1A-4
ON-VEHICLE SERVICE .................................. 1A-5
HEATER UNIT ............................................. 1A-5BLOWER FAN MOTOR ............................... 1A-7
BLOWER FAN MOTOR RESISTOR ........... 1A-8
HEATER CONTROL ASSEMBLY ............... 1A-9
AIR INLET BOX ......................................... 1A-12
VENTILATION LOUVER............................ 1A-13
REQUIRED SERVICE MATERIALS ............. 1A-14

WARNING:
For vehicles equipped with Supplement Restraint (Air Bag) System
 Service on and around the air bag system components or wiring must be performed only by an
authorized SUZUKI dealer. Refer to “Air Bag System Components and Wiring Location View” under
“General Description” in Section 10B in order to confirm whether you are performing service on or
near the air bag system components or wiring. Please observe all WARNINGS and “Service Precau-
tions” under “On-Vehicle Service” in Section 10B before performing service on or around the air
bag system components or wiring. Failure to follow WARNINGS could result in unintentional activa-
tion of the system or could render the system inoperative. Either or these two conditions may result
in severe injury.
 Technical service work must be started at least 90 seconds after the ignition switch is turned to the
“LOCK” position and the negative cable is disconnected from the battery. Otherwise, the system
may be activated by reserve energy in the Sensing and Diagnostic Module (SDM).
NOTE:
The link mechanism of the heater varies depending on the specifications.

HEATER AND VENTILATION 1A-3
DIAGNOSIS
DIAGNOSIS TABLE
Condition Possible Cause Correction
Heater blower fan
motor won’t work even
when its switch is
operating position.Fuse blown Check “HEATER” fuse, main heater
fuse and check for short circuit to
ground.
Blower main relay faulty Check blower main relay.
Blower fan motor resistor faulty Check resistor.
Blower fan motor switch faulty Check blower fan switch.
Blower fan motor faulty Replace motor.
Wiring or grounding faulty Repair as necessary.
Heater blower fan
won’t work when its
switch is maximum
position.Blower maximum relay faulty Check blower maximum relay.
Blower fan motor switch faulty Check blower fan switch.
Wiring or grounding faulty Check wiring, grounding and repair
as necessary.
Incorrect temperature
output.Control cables broken or binding Check cables.
Temperature control lever faulty Check control lever.
Position of control cable clamp is faulty Check and adjustment.
Temperature door assembly broken Repair temperature door assembly.
Air ducts clogged Repair air ducts.
Heater core leaking or clogged Replace core.
Heater hoses leaking or clogged Replace hoses.
Thermostat faulty Check thermostat by referring to
Section 6B.
When mode control
lever is changed, air
outlet port is not
changed or lever posi-
tion disagree with air
outlet port.Control cable broken or binding Check cable.
Mode control lever faulty Check control lever.
Position of control cable clamp is faulty Check and adjust clamp posi-
tion.Check and adjustment.
Air damper broken Repair damper.
Air ducts leaking or clogged Repair air ducts.

1A-6 HEATER AND VENTILATION
REMOVAL
1) Disconnect negative (–) cable at battery.
2) Drain engine coolant and disconnect heater hoses (1) from
heater unit.
3) Remove heater unit mounting nut (2).
4) Remove instrument panel by referring to “INSTRUMENT
PANEL” in Section 9.
5) Disconnect blower motor and resistor couplers from heater
unit.
6) Remove bolts (1), nuts (2) and screws (3) as shown.
7) Remove cooling unit (4) and heater unit (5) from vehicle.
INSTALLATION
Reverse removal procedure to install heater unit noting the follow-
ing instructions.
When installing each part, be careful not to catch any cable
or wiring harness.
Adjust heater control cable by referring to “HEATER CON-
TROL LEVER ASSEMBLY” in this section.
Fill engine coolant to radiator.

AIR CONDITIONING (OPTIONAL) 1B-1
6F1
6F2
6G
1B
7A
7A1
7B1
7C1
7D
7E
7F
8A
8B
8C
8D
8E
9
10
10A
10B
SECTION 1B
AIR CONDITIONING (OPTIONAL)
CONTENTS
GENERAL DESCRIPTION .............................. 1B-3
REFRIGERANT CIRCULATION .................. 1B-3
REFRIGERANT TYPE ................................. 1B-3
MAJOR COMPONENTS AND
LOCATION ................................................... 1B-4
DIAGNOSIS ..................................................... 1B-5
GENERAL DIAGNOSIS TABLE ................... 1B-5
ABNORMAL NOISE DIAGNOSIS ................ 1B-7
QUICKLY CHECKING OF REFRIGERANT
CHARGE ...................................................... 1B-9
PERFORMANCE DIAGNOSIS .................. 1B-10
PERFORMANCE DIAGNOSIS TABLE .. 1B-12
DETAIL DIAGNOSIS TABLE (AMBIENT
TEMPERATURE AT 30°C (86°F)) ......... 1B-13
COMPRESSOR DRIVE BELT ................... 1B-15ELECTRICAL DIAGNOSIS ........................... 1B-16
WIRING DIAGRAM .................................... 1B-16
A/C SYSTEM INSPECTION OF ECM AND
ITS CIRCUITS ........................................... 1B-17
REFRIGERANT RECOVERY, EVACUATING
AND CHARGING........................................... 1B-20
OPERATION PROCEDURE FOR
REFRIGERANT CHARGING ..................... 1B-20
RECOVERY ............................................... 1B-21
REPLENISHING COMPRESSOR OIL ...... 1B-21
EVACUATING............................................ 1B-22
EVACUATING PROCEDURE ................ 1B-22
CHECKING SYSTEM FOR PRESSURE
LEAKS.................................................... 1B-23
CHARGING................................................ 1B-24
CHARGING PROCEDURE .................... 1B-24 WARNING:
For vehicles equipped with Supplemental Restraint (Air Bag) System :
 Service on and around the air bag system components or wiring must be performed only by an
authorized SUZUKI dealer. Refer to “Air Bag System Components and Wiring Location View” under
“General Description” in air bag system section in order to confirm whether you are performing ser-
vice on or near the air bag system components or wiring. Please observe all WARNINGS and “Ser-
vice Precautions” under “On-Vehicle Service” in air bag system section before performing service
on or around the air bag system components or wiring. Failure to follow WARNINGS could result in
unintentional activation of the system or could render the system inoperative. Either of these two
conditions may result in severe injury.
 Technical service work must be started at least 90 seconds after the ignition switch is turned to the
“LOCK” position and the negative cable is disconnected from the battery. Otherwise, the system
may be activated by reserve energy in the Sensing and Diagnostic Module (SDM).
CAUTION:
The air conditioning system of this vehicle uses refrigerant HFC-134a (R-134a).
None of refrigerant, compressor oil and component parts is interchangeable between two types of
A/C : one using refrigerant HFC-134a (R-134a) and the other using refrigerant CFC-12 (R-12).
Be sure to check which refrigerant is used before any service work including inspection and mainte-
nance. For identification between these two types, refer to “REFRIGERANT TYPE” in this section.
When replenishing or changing refrigerant and compressor oil and when replacing parts, make sure
that the material or the part to be used is appropriate to the A/C installed in the vehicle being serviced.
Use of incorrect one will result in leakage of refrigerant, damage in parts or other faulty condition.
NOTE:
For basic servicing method of the air conditioning system that is not described in this section, refer to
“AIR CONDITIONING BASIC MANUAL (Part number : 99520-02130)”.

AIR CONDITIONING (OPTIONAL) 1B-5
DIAGNOSIS
GENERAL DIAGNOSIS TABLE
Condition Possible Cause Correction
Cool air won’t come
out (A/C system won’t
operative)No refrigerant Perform recover, evacuation and charging.
Fuse blown Check fuses in circuit fuse and main fuse
boxes, and check short circuit to ground.
A/C switch faulty Check A/C switch.
Blower fan switch faulty Check blower fan switch referring to Sec-
tion 1A.
A/C evaporator temperature sensor
faultyCheck A/C evaporator temperature sen-
sor.
A/C refrigerant pressure switch faulty Check A/C refrigerant pressure switch.
Wiring or grounding faulty Repair as necessary.
ECT sensor faulty Check ECT sensor referring to Section
6E1.
ECM and its circuit faulty Check ECM and its circuit referring to Sec-
tion 6E1.
Cool air won’t come
out (A/C compressor
won’t operative)ECM faulty Check ECM and its circuit referring to Sec-
tion 6E1.
Magnet clutch faulty Check magnet clutch.
Compressor drive belt loosen or broken Adjust or replace drive belt.
Compressor faulty Check compressor.
Compressor thermal switch faulty Check compressor thermal switch
Cool air won’t come
out (A/C condenser
cooling fan motor
won’t operative)Fuse blown Check fuses in circuit fuse and main fuse
boxes, and check short circuit to ground.
Wiring or grounding faulty Repair as necessary.
Radiator/condenser cooling fan motor
relay faultyCheck radiator/condenser cooling fan
motor relay No.1, No.2 and No.3.
Radiator/condenser cooling fan motor
faultyCheck radiator/condenser cooling fan
motor.
ECM faulty Check ECM and its circuit referring to Sec-
tion 6E1.
Cool air won’t come
out (Blower fan motor
won’t operative)Fuse blown Check “HTR” fuse in circuit fuse box and
main fuses, and check short circuit to
ground.
Blower fan motor resistor faulty Check blower fan motor resistor to Section
1A.
Blower fan switch faulty Check blower fan switch referring to Sec-
tion 1A.
Wiring or grounding faulty Repair as necessary.
Blower fan motor faulty Check blower fan motor referring to Sec-
tion 1A.

1B-6 AIR CONDITIONING (OPTIONAL)
Cool air won’t come
out or insufficient
cooling (A/C system
normal operative)Insufficient or excessive charge of
refrigerantCheck charge of refrigerant and system for
leaks.
Condenser clogged Check condenser.
A/C evaporator clogged or frosted Check A/C evaporator and A/C evaporator
temperature sensor.
A/C evaporator temperature sensor
faultyCheck A/C evaporator temperature sen-
sor.
Expansion valve faulty Check expansion valve.
Receiver/dryer clogged Check receiver/dryer.
Compressor drive belt loosen or broken Adjust or replace drive belt.
Magnetic clutch faulty Check magnetic clutch.
Compressor faulty Check compressor.
Air in A/C system Replace dryer, and perform evacuation
and charging.
Air leaking from cooling unit or air duct Repair as necessary.
Heater and ventilation system faulty Check air inlet box (cooling unit), heater
control assembly and heater unit referring
to Section 1A.
Blower fan motor faulty Check blower fan motor referring to Sec-
tion 1A.
Excessive compressor oil existing in A/
C systemPull out compressor oil in A/C system cir-
cuit, and check compressor.
Cool air won’t come
out only intermittentlyWiring connection faulty Repair as necessary.
Expansion valve faulty Check expansion valve.
Excessive moisture in A/C system Replace dryer, and perform evacuation
and charging.
Magnetic clutch faulty Check magnetic clutch.
Excessive charge of refrigerant Check charge of refrigerant.
Cool air comes out
only at high speedCondenser clogged Check condenser.
Insufficient charge of refrigerant Check charge of refrigerant.
Air in A/C system Replace dryer, and perform evacuation
and charging.
Compressor drive belt loosen or broken Adjust or replace drive belt.
Compressor faulty Check compressor.
Cool air won’t come
out only at high speedExcessive charge of refrigerant Check charge of refrigerant.
A/C evaporator frosted Check A/C evaporator and A/C evaporator
temperature sensor.
Insufficient velocity of
cooled airA/C evaporator clogged or frosted Check A/C evaporator and A/C evaporator
temperature sensor.
Air leaking from cooling unit or air duct Repair as necessary.
Blower fan motor faulty Check blower fan motor referring to Sec-
tion 1A.
Wiring or grounding faulty Repair as necessary. Condition Possible Cause Correction

1B-16 AIR CONDITIONING (OPTIONAL)
ELECTRICAL DIAGNOSIS
WIRING DIAGRAM
1. Blower fan motor 6. Radiator/condenser cooling fan relay No.2 11. Ignition switch 16. Main fuse box
2. Blower fan motor resistor 7. Radiator/condenser cooling fan relay No.3 12. A/C evaporator temperature sensor 17. Generator
3. Blower fan switch and A/C switch 8. Radiator/condenser cooling fan motor 13. ECT sensor 18. Compressor
4. A/C refrigerant pressure switch 9. Compressor thermal switch 14. Lighting switch
5. Radiator/condenser cooling fan relay No.1 10. Main relay 15. Circuit fuse box

AIR CONDITIONING (OPTIONAL) 1B-17
A/C SYSTEM INSPECTION OF ECM AND ITS
CIRCUITS
ECM and its circuits can be checked at ECM wiring couplers by
measuring voltage.
VOLTAGE CHECK
1) Remove ECM from vehicle by referring to “ECM (PCM)
REMOVAL AND INSTALLATION” in Section 6E1.
2) Connect ECM couplers (1) to ECM (2).
3) Check voltage at each terminal of couplers connected.CAUTION:
ECM cannot be checked by itself. It is strictly prohibited
to connect voltmeter or ohmmeter to ECM with couplers
disconnected from it.
NOTE:
As each terminal voltage is affected by the battery volt-
age, confirm that it is 11 V or more when ignition switch
is ON position.
[A] : Fig. A
[B] : Fig. B