Component Inspection

Air Conditioner

Air Conditioner - B1204 Air Mix Potentiometer Open (Low)-Passenger - Component Inspection

Component Inspection

Check A/C Control Unit
1. Engine "ON".
2. Disconnect passenger air mix actuator.
3. Measure voltage value between terminal "B1" of A/C control unit and chassis ground.

Specification : 5 V




4. Is the measured voltage within specifications?





Check passenger air mix actuator.
1. Check actuator motor
(1) Ignition "OFF".
(2) Disconnect passenger air mix actuator.
(3) Connect (+) terminal of battery to terminal 3 of passenger air mix actuator and (-) terminal to terminal 4.
(4) Verify that the temperature actuator operates to the hot position.
(5) Verify that the temperature actuator operates to the cool position with reverse connecting. ((+) to 4 and (-) to 3)




(6) Dose the actuator work properly?





2. Check actuator potentiometer
(1) Ignition "ON".
(2) Connect passenger air mix actuator.
(3) Measure voltage between terminal "5" and "6" of passenger air mix actuator while operating the temp switch.

Specification : Refer the specifications in fig 3)




Fig.3) Specifications : Voltage value of air mix potentiometer as a function of temp door position





(4) Is the measured voltage within specifications in fig 3)?