Component Inspection

Air Conditioner
B1245 Air mix potentiometer open (Low) - Driver - Inspection/Repair:_:Component Inspection

Component Inspection

Check Driver air mix actuator
1. Ignition "OFF"
2. A/C-ECU, Driver air mix actuator : Disconnect
3. Connect (+) terminal of battery to WARM(+) of Driver air mix actuator and (-) terminal to COOL(-).(Component side)
4. Verify that the temperature actuator operates to the WARM position.
5. Verify that the temperature actuator operates to the COOL position with reverse connecting.(COOL(+) and WARM(-) ).(Component side)
A. Specification : Refer the specifications in fig.1








6. Is "Door position" display near the specified value?
YES
1) Go to "Check potentiometer" procedure.
NO
1) Substitute with a known-good Driver air mix actuator and check for proper operation. If the problem is corrected, replace Driver air mix actuator and then go to "Verification of Vehicle Repair" procedure.
Check potentiometer
1. Ignition "OFF"
2. A/C-ECU : Connect, Driver air mix actuator : Disconnect.
3. Ignition "ON"(ENGINE "OFF").
4. Measure voltage between Signal(F/B) terminal of Driver air mix actuator harness connector and and chassis ground.(Component side)
A. Specification : Refer the specifications in fig.2








5. Is "voltage" display near the specified value?
YES
1) Check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure.
NO
1) Substitute with a known-good Driver air mix actuator and check for proper operation. If the problem is corrected, replace Driver air mix actuator and then go to "Verification of Vehicle Repair" procedure.