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Dtc B1520 / B1521 / B1522: Temperature / Blower Speed / Air Flow Selector Malfunction - Suzuki SX4 Service Manual

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DTC Troubleshooting
Step
1
Was "Air Conditioning System Check" performed?
2
DTC check
1) Connect scan tool to DLC with ignition switch turned
OFF.
2) Turn ignition switch to ON position and check DTC.
Is DTC B1512 detected together?
3
Visual Check
Check if there is any obstruction in operating range of
actuator linkage and if actuator linkage operates smoothly.
Is it in good condition?
4
Wire harness check
1) Turn ignition switch to OFF position.
2) Disconnect connectors from air flow control actuator and
HVAC control module.
3) Check for proper connection to actuator motor drive
circuit terminals of air flow control actuator and HVAC
control module connectors.
4) If OK, check that actuator motor drive circuit of air flow
control actuator is as follows.
• Wiring harness resistance of each actuator motor
drive circuit is less than 3 Ω
• Insulation resistance of each actuator motor drive
circuit is infinity between air flow control actuator
connector and vehicle body ground
• Circuit voltage of each actuator motor drive circuit is 0
– 1 V with ignition switch turned ON
Are they in good condition?
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: Automatic Type".
Is it in good condition?
6
Air Flow control actuator check
1) Check air flow control actuator for performance referring
to "Air Flow Control Actuator and Its Circuit Inspection:
Automatic Type".
Is it in good condition?

DTC B1520 / B1521 / B1522: Temperature / Blower Speed / Air Flow Selector Malfunction

DTC Detecting Condition and Trouble Area
DTC Detecting Condition
When internal malfunction is detected in the
HVAC control module.
Action
• 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)
Air Conditioning System: Automatic Type 7B-65
Yes
Go to Step 2.
Go to "DTC B1512: Air
flow Control Actuator
(Position Sensor) and/or
Its Circuit Malfunction:
Automatic Type".
Go to Step 4.
Go to Step 5.
Go to Step 6.
Substitute a known-
good HVAC control
module and recheck.
Trouble Area
No
Go to "Air Conditioning
System Check:
Automatic Type".
Go to Step 3.
Obstruction in operating
range of actuator
linkage, actuator linkage
faulty and/or internal
fault of HVAC unit.
Actuator motor drive
circuit(s) is open, short
or high resistance.
Repair or replace.
Replace air flow control
actuator.
S7RW0A7224017

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