3843584

Check actuator motor

(1)

Ignition "OFF".

(2)

Disconnect DR Air Mix actuator.

(3)

Connect (+) terminal of battery to terminal 3 of DR Air Mix actuator and (-) terminal to terminal 4.

(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.( (+) to 4 and (-) to 3)

(6)

Dose the actuator work properly?

YES

Go to "Check potentiometer" procedure.

Substitute with a known-good actuator and check for proper operation. If the problem is corrected, replace actuator and then go to "Verification of Vehicle Repair" procedure.

Check actuator potentiometer

(1)

Ignition "ON".

(2)

Connect DR Air Mix actuator.

(3)

Measure voltage between terminal "6" and "7" of DR Air Mix actuator while operating the temp switch.

Specification : Refer the specifications in fig3)

Door position	Voltage	Error Detecting Condition
Max. cool	0.3±0.15V	Undervoltage : 0.08V or less
Max.warm	4.7±0.15V	Overvoltage : 4.9V or more

Fig3) Specifications : Voltage value of Air Mix potentiometer as a function of temp door position.

(4)

Is the measured voltage within specifications in fig3)?

YES

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.

Substitute with a known-good actuator and check for proper operation. If the problem is corrected, replace actuator and then go to "Verification of Vehicle Repair" procedure.