Suzuki 2006 SX4 Service Manual page 1006

7B-66 Air Conditioning System: Automatic Type
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 B1511 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 temperature control
actuator and HVAC control module.
3) Check for proper connection to actuator motor drive
circuit terminals of temperature control actuator and
HVAC control module connectors.
4) If OK, check that actuator motor drive circuit of
temperature 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 temperature 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 B1511: Temperature
Control Actuator (Position Sensor) and/or Its Circuit
Malfunction".
Is it in good condition?
6 Temperature control actuator check
1) Check temperature control actuator for performance
referring to "Temperature Control Actuator and Its Circuit
Inspection".
Is it in good condition?
Action Yes
Go to Step 2.
Go to "DTC B1511:
Temperature Control
Actuator (Position
Sensor) and/or Its
Circuit Malfunction".
Go to Step 4.
Go to Step 5.
Go to Step 6.
Substitute a known-
good HVAC control
module and recheck.
No
Go to "Air Conditioning
System Check".
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 temperature
control actuator.