Component Inspection

Component Inspection

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

Specification : 5V





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)





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) ?