Suzuki 2006 SX4, Service Manual

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Air Conditioning System: Automatic Type 7B-68
DTC B1520 / B1521 / B1522: Temperature / Blower Speed / Air Flow Selector Malfunction
S6RW0C7224017
DTC Detecting Condition and Trouble Area
DTC Troubleshooting
5 Wire harness check
Check position sensor circuit of temperature control actuator
for condition referring to Step 2 of “DTC B1512: Air flow
Control Actuator (Position Sensor) and/or Its Circuit
Malfunction”.
Is it in good condition?
Go to Step 6. Repair or replace.
6 Air Flow control actuator check
1) Check air flow control actuator for performance referring
to “Air Flow Control Actuator and Its Circuit Inspection”.
Is it in good condition?
Substitute a known-
good HVAC control
module and recheck. Replace air flow control
actuator.
Step Action Yes No
DTC Detecting Condition Trouble Area
When internal malfunction is detected in the
HVAC control module. • Temperature selector included in HVAC control module (DTC
B1520)
• Blower speed selector included in HVAC control module (DTC
B1521)
• Air flow selector included in HVAC control module (DTC B1522)
Step Action Yes No
1 Was “Air Conditioning System Check” performed? Go to Step 2. Go to “Air Conditioning
System Check”.
2 DTC check
1) Clear DTC referring to “DTC Clearance”.
2) Recheck DTC.
Are DTC B1520, B1521 and/or B1522 still detected?
Substitute a known
good HVAC control
module and recheck. Intermittent trouble.
Check for intermittent
referring to “Intermittent
and Poor Connection
Inspection in Section
00”.