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Abnormal Noise Symptom Diagnosis Of A/C System; Dtc Check - Suzuki SX4 Service Manual

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7B-48 Air Conditioning System: Automatic Type
Condition
Cool air does not come
out only at high speed
Insufficient air flow of
cooled air
Abnormal Noise Symptom Diagnosis of A/C
System
Refer to "Abnormal Noise Symptom Diagnosis of A/C
System: Manual Type".

DTC Check

Using SUZUKI Scan Tool
1) Turn ignition switch to OFF position.
2) Connect SUZUKI scan tool to data link connector
(DLC) (1) located on underside of instrument panel
at driver's seat side.
Special tool
(A): SUZUKI scan tool
(A)
1
3) Light over sunload sensor vertically with an
incandescent light of approximately 100 W apart
from about 100 mm (3.94 in.).
NOTE
If sunload sensor is not lighted over with an
incandescent light, DTC B1504 is detected
even though there is not any malfunction.
4) Turn ignition switch to ON position.
5) Read DTC displayed on SUZUKI scan tool.
Possible cause
Excessive amount of refrigerant
A/C evaporator frosted
A/C evaporator clogged or frosted
Air leaking from HVAC unit or air duct
Blower motor faulty
Wiring or grounding faulty
S7RW0A7224003
S7RW0A7224004
I5RW0A722004-01
Correction / Reference Item
Check the amount of refrigerant.
Check A/C evaporator and evaporator
temperature sensor referring to "Evaporator
Inspection: Manual Type" and "Evaporator
Temperature Sensor Inspection: Manual Type".
Check A/C evaporator and evaporator
temperature sensor referring to "Evaporator
Inspection: Manual Type" and "Evaporator
Temperature Sensor Inspection: Manual Type".
Repair as necessary.
Check blower motor referring to "Blower Motor
Inspection in Section 7A".
Repair as necessary.
NOTE
To know how to use SUZUKI scan tool, refer
to operator's manual for SUZUKI scan tool.
6) After completing the check, turn ignition switch to
OFF position and disconnect SUZUKI scan tool from
data link connector (DLC).
Not Using SUZUKI Scan Tool
NOTE
In case of malfunction of temperature
selector, blower speed selector and air flow
selector, DTC can not be checked by the
following procedure. Use SUZUKI scan tool
for DTC check.
1) Light over sunload sensor vertically with an
incandescent light of approximately 100 W apart
from about 100 mm (3.94 in.).
NOTE
If sunload sensor is not lighted over with an
incandescent light, DTC of sunload sensor is
detected as current DTC even though there is
not any malfunction.
2) Set the following selectors to specified positions
below respectively with ignition switch off position.
• Temperature selector (1) is maximum cool
position
• Blower speed selector (2) is OFF position
• Air flow selector (3) is AUTO position
3) While pressing A/C switch (4) and air intake selector
(5) simultaneously, turn ignition switch to ON
position.
4) Wait for about 5 seconds (start of diagnosis).
5) Read flashing pattern of "FRE" (6) and "REC" (7)
indicator lights which represents DTC and write it
down.

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