Suzuki 2006 SX4, Service Manual

Page: 927 / 1478

Air Conditioning System: Automatic Type 7B-62
DTC Detecting Condition and Trouble Area
DTC Troubleshooting
NOTE
• When DTC B1502, B1503, B1504 and B1512 are indicated together, it is possible that sensor ground
circuit is open.
• When DTC B1512 is indicated together, it is possible that position sensor power supply circuit is
open.
DTC Detecting Condition Trouble Area
Temperature control actuator position sensor signal voltage is higher than or
lower than specified value for specified time continuously. • Temperature control actuator circuit
• Temperature control actuator
• HVAC control module
Step Action Yes No
1 Was “Air Conditioning System Check” performed? Go to Step 2. Go to “Air Conditioning
System Check”.
2 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 position sensor power
supply, signal and ground circuit terminals of
temperature control actuator and HVAC control module
connectors.
4) If OK, check that position sensor of temperature control
actuator circuit is as follows.
• Wiring harness resistance of each position sensor
power supply, signal and ground circuit is less than 3
Ω
• Insulation resistance of each position sensor power
supply, signal and ground circuit is infinity between
temperature control actuator connector and vehicle
body ground
• Circuit voltage of each position sensor power supply,
signal and ground circuit is 0 - 1 V with ignition switch
turned ON
Are they in good condition?
Go to Step 3. Position sensor power
supply, signal circuit
and/or ground circuit are
open, short or high
resistance.
3 Position sensor of temperature control actuator power
supply voltage check
1) Connect connector to HVAC control module.
2) Turn ignition switch to ON position.
3) Measure voltage between.
• Position sensor power supply terminal and position
sensor ground terminal of temperature control
actuator connector
• Position sensor signal terminal and position sensor
ground terminal of temperature control actuator
connector
Is voltage 4.5 – 5.5 V?
Go to Step 4. Go to Step 5.