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Diagnostic Information And Procedures; Heater And Ventilation Symptom Diagnosis - Suzuki SX4 Service Manual

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Heater and Ventilation Symptom Diagnosis

Condition
Blower motor does not
operate with blower
speed selector ON
Incorrect temperature
output
Air outlet port does not
change or does not agree
with air flow selector's
position even if air flow
selector is changed
Air intake door does not
change even if air intake
mode is changed

Diagnostic Information and Procedures

Possible cause
Fuse blown
Blower motor relay faulty
Blower motor resistor faulty
Blower speed selector faulty
Blower motor faulty
Wiring or grounding faulty
Temperature control cable broken or
bent (non-A/C and manual A/C)
Temperature selector faulty (non-A/C
and manual A/C)
Incorrect installation of temperature
control cable (non-A/C and manual A/C)
Temperature control door assembly
broken
Air ducts clogged
Heater core leaked or clogged
Heater hoses leaked or clogged
Thermostat faulty
Temperature control actuator faulty
(auto A/C)
HVAC control module faulty (auto A/C)
Wiring or grounding faulty (auto A/C)
Air flow control cable broken or bent
(non-A/C and manual A/C)
Air flow selector faulty (non-A/C and
manual A/C)
Incorrect installation of air flow control
cable (non-A/C and manual A/C)
Air flow control door assembly broken
Air ducts leaked or clogged
Air flow control actuator faulty (auto A/C) Check air flow control actuator referring to "Air
HVAC control module faulty (auto A/C)
Wiring or grounding faulty (auto A/C)
Air intake door broken
Air intake control actuator faulty
Air intake selector faulty
Wiring or grounding faulty
Heater and Ventilation:
Correction / Reference Item
Check related fuses, and then check for short
circuit to ground.
Check blower motor relay referring to "Blower
Motor Relay Inspection".
Check blower motor resistor referring to
"Blower Motor Resistor Inspection".
Check blower speed selector referring to
"Blower Speed Selector Inspection".
Check blower motor referring to "Blower Motor
Inspection".
Repair as necessary.
Check temperature control cable.
Check temperature selector.
Check position and adjust it as necessary.
Repair temperature control door assembly.
Repair air ducts.
Replace heater core.
Replace heater hoses.
Check thermostat referring to "Thermostat
Inspection in Section 1F".
Check temperature control actuator referring to
"Temperature Control Actuator and Its Circuit
Inspection: Automatic Type in Section 7B".
Check HVAC control module referring to
"Inspection of HVAC Control Module and Its
Circuit: Automatic Type in Section 7B".
Repair as necessary.
Check air flow control cable.
Check air flow selector.
Check position and adjust it as necessary.
Repair air flow control door assembly.
Repair air ducts.
Flow Control Actuator and Its Circuit
Inspection: Automatic Type in Section 7B".
Check HVAC control module referring to
"Inspection of HVAC Control Module and Its
Circuit: Automatic Type in Section 7B".
Repair as necessary.
Repair air intake door.
Check air intake control actuator referring to
"Air Intake Control Actuator Inspection".
Check air intake selector referring to "Air Intake
Selector Inspection".
Repair as necessary.
7A-3
S7RW0A7104001

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