B2409

Component Location






General Description

The mode control actuator mounted on heater unit adjusts position of mode door by operating Direction Motor in accordance with signal of A/C control unit. Pressing mode select switch makes the mode control actuator shift in order of vent-> B/L -> floor -> mix.

DTC Description

Air conditioner Control Module sets DTC B2409 if Driver Direction actuator has not been moved to the mode,where air condition control module controls, within 10 seconds.

DTC Detecting Condition






Specification

** Voltage value of potentiometer as a function of mode door position.






Diagnostic Circuit Diagram






Monitor Scantool Data

Actuation Test
1. Connect scantool with diagnostic connector.
2. Warm up the engine to normal engine temperature after engine starts.
3. Select and monitor "Direction Potention" parameter on scantool.
4. Select and perform Actuation test Driver Mode Door - Face / Foot / Defrost in order.
5. Check that the value of all the parameters are changed when performing the actuation test.

Specification :Face - About below 10%, Foot : About 50%, Defrost : About 90%.






6. Are all the parameters changed when performing Actuation test ?






Terminal & Connector Inspection

1. Many malfunctions in the electrical system are caused by poor harness and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration,or damage.
3. Has a problem been found?






Control Circuit Inspection

Check for open in harness
1. Ignition "OFF".
2. Disconnect Driver Direction actuator and A/C control unit main harness connector.
3. Measure resistance between DEF terminal of Driver Direction actuator harness connector and DEF terminal of A/C-ECU harness connector.
4. Measure resistance between VENT terminal of Driver Direction actuator harness connector and VENT terminal of A/C-ECU harness connector.

Specification :1Ohms below

5. Is the measured resistance within specification?






Check short to ground in harness
1. Ignition "OFF".
2. Disconnect Driver Direction actuator and A/C control unit main harness connector.
3. Measure resistance between DEF terminal of Driver Direction actuator harness connector and chassis ground.
4. Measure resistance between VENT terminal of Driver Direction actuator harness connector and chassis ground.

Specification :Infinity

5. Is the measured resistance within specification?






Component Inspection

Check Driver Direction actuator
1. Ignition "OFF".
2. Disconnect Driver Direction actuator and A/C control unit main harness connector.
3. Connect (+) terminal of battery to WARM(+) of Driver Direction actuator and (-) terminal to COOL(-).(Component side)
4. Verify that the temperature actuator operates to the cool position.
5. Verify that the temperature actuator operates to the warm position with reverse connecting.( WARM(+) and COOL(-) ).(Component side)

Specification :Refer the specifications in fig.1

FIG.1) ** Function of the actuator motor according to terminal connection type. (observe safety regulations)






6. Is "Door position" display near the specified value?






Check potentiometer
1. Ignition "OFF".
2. Connect Driver Direction actuator and A/C control unit main harness connector.
3. Ignition "ON".
4. Measure voltage between Signal(F/B) terminal of Driver Direction actuator harness connector and Sensor ground(-) terminal of A/C-ECU harness connector.(Component side)

Specification :Refer the specifications in fig.2


FIG.2) ** Voltage value of Direction potentiometer as a function of position of mode switch





5. Is "voltage" display near the specified value?






Verification of Vehicle Repair

After a repair, it is essential to verify that the fault has been corrected.
1. Connect scantool and select "Diagnostic Trouble Codes(DTCs)" mode and then clear DTC.
2. Operate the vehicle and monitor the DTC on the scantool.
3. Are any DTCs present?