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Suzuki SX4 Service Manual page 1040

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7B-46 Air Conditioning System: Automatic Type
A/C System Symptom Diagnosis
Condition
No cool air comes out (A/
C system does not
operate)
No cool air comes out
(radiator cooling fan
motor does not operate)
No cool air comes out
(blower motor does not
operate)
Possible cause
No refrigerant
Fuse blown
A/C switch faulty
Evaporator temperature sensor faulty
A/C refrigerant pressure sensor faulty
Wiring or grounding faulty
ECM faulty
HVAC control module faulty
Magnet clutch faulty
Compressor drive belt loosened or
broken
Compressor faulty
Compressor relay faulty
BCM faulty
Fuse blown
Wiring or grounding faulty
Condenser cooling fan motor relay faulty Check condenser cooling fan motor relay
Condenser cooling fan motor faulty
ECM faulty
HVAC control module faulty
Fuse blown
Blower motor controller faulty
HVAC control module faulty
Wiring or grounding faulty
Blower motor faulty
Blower motor relay faulty
Correction / Reference Item
Perform recovery, evacuation and charge
referring to "Operation Procedure for
Refrigerant Charge: Manual Type".
Check related fuses, and then check for short
circuit to ground.
Check A/C switch referring to "Inspection of
HVAC Control Module and Its Circuit:
Automatic Type".
Check evaporator temperature sensor
referring to "Evaporator Temperature Sensor
Inspection: Manual Type".
Check A/C refrigerant pressure sensor
referring to "A/C Refrigerant Pressure Sensor
and Its Circuit Inspection: Manual Type".
Repair as necessary.
Check ECM referring to "A/C System
Inspection at ECM: Automatic Type".
Check HVAC control module referring to
"Inspection of HVAC Control Module and Its
Circuit: Automatic Type".
Check magnet clutch referring to "Magnet
Clutch Inspection: Manual Type".
Adjust or replace drive belt.
Check compressor.
Check compressor relay referring to "A/C
System Relay Inspection: Manual Type".
Check BCM referring to "Inspection of BCM
and Its Circuits in Section 10B".
Check related fuses, and then check for short
circuit to ground.
Repair as necessary.
referring to "A/C System Relay Inspection:
Manual Type".
Check condenser cooling fan motor referring to
"Condenser Cooling Fan Inspection: Manual
Type".
Check ECM referring to "A/C System
Inspection at ECM: Automatic Type".
Check HVAC control module referring to
"Inspection of HVAC Control Module and Its
Circuit: Automatic Type".
Check related fuses, and then check for short
circuit to ground.
Check blower motor controller referring to
"Blower Motor Controller Inspection: Automatic
Type".
Check HVAC control module referring to
"Inspection of HVAC Control Module and Its
Circuit: Automatic Type".
Repair as necessary.
Check blower motor referring to "Blower Motor
Inspection in Section 7A".
Check blower motor relay referring to "Blower
Motor Relay Inspection in Section 7A".
S7RW0A7224002

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