Component Inspection

Air Conditioner
B1284 Direction Potentiometer Short (High) - Auto Defog - Inspection/Repair:_:Component Inspection

Component Inspection

Check Auto Defog actuator
1. Ignition "OFF"
2. Disconnect Auto Defog actuator and connect A/C control unit main harness connector.
3. Connect (+) terminal of battery to OPEN(+) of Auto Defog actuator and (-) terminal to CLOSE(-). (Component side)
4. Verify that the Auto Defog actuator operates to the OPEN position.
5. Verify that the Auto Defog actuator operates to the OPEN position with reverse connecting.( OPEN(+) and CLOSE(-) ). (Component side)

Specification :Refer the specifications in Fig.1)




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 Auto Defog actuator and A/C control unit main harness connector.
3. Ignition "ON"
4. Measure voltage between Signal(F/B) terminal of Auto Defog actuator harness connector and Sensor ground(-) terminal of A/C-ECU harness connector. (Component side)

Specification :Refer the specifications in Fig.2)




Fig.2)





Fig.2) ** Voltage value of Auto Defog actuator as a function of position of mode switch.
5. Is "voltage" display near the specified value?