Defog Door Actuator

Description and Operation

Description

The auto defog sensor is installed on the windshield. The sensor detects moisture and sends a signal so that air is blown to prevent fogging. The A/C control unit receives the signal from the sensor and removes the moisture to eliminate fogging by controlling the intake actuator, A/C, auto defog actuator, blower motor speed, and mode actuator.

Components and Component Location

Component Location

1. Auto defog door actuator

Repair Procedures

Inspection

1. 1
   Turn the ignition off.
2. 2
   Disconnect the auto defog actuator connector.
3. 3
   Make sure the auto defog door actuator operates to the open position when 12 V is applied to terminal 3 and terminal 4 is grounded. Make sure the auto defog door actuator operates to the closed position when connected in reverse.

   

   1. - 2. - 3. DEF (Closed) 4. DEF (Open)

   5. Sensor power (+5V) 6. Feedback signal 7. Sensor ground

4. 4
   Connect the defogger actuator connector.
5. 5
   Turn the ignition on.
6. 6
   Check the voltage between terminals 5 and 4.

   It will display the current position of the actuator. to the controls.

   Specification

   Door Position	Voltage (V)	Fault Detection
   Anti-Fog ON (Open)	0,5 ± 0,15	Low voltage: 0.7 V or less
   Anti-Fog OFF (Close)	4,7 ± 0,15	High voltage: 4.9 V or less

7. 7
   If the measured voltage does not meet the specification, check operation by replacing the existing auto defog actuator with a new genuine part. Then determine whether replacement of the auto defog actuator is required or not.

Replacement

1. 1
   Disconnect the negative (-) battery terminal.
2. 2
   Remove the driver airbag module assembly. (Refer to Body - "Driver Airbag Module Assembly")
3. 3
   Press the locking pin, disconnect the connector (A), then loosen the mounting screws and remove the auto defog door actuator (B).

   

4. 4
   Install in the reverse order of removal.