Ignition "OFF"
Disconnect Auto Defog actuator and A/C control Module main harness connector.
Connect (+) terminal of battery to OPEN(+) of Auto Defog actuator and (-) terminal to CLOSE(-). (Component side)
Verify that the Auto Defog actuator operates to the OPEN position.
Verify that the Auto Defog actuator operates to the CLOSE position with reverse connecting.( CLOSE(+) and OPEN(-) ). (Component side)
Specification : Refer the specifications in Fig.1)
Actuator harness | OPEN(+) | CLOSE(-) | Door position |
Battery terminal | 12 V | ground | OPEN |
ground | 12 V | CLOSE |
Fig.1) ※ Function of the actuator motor according to terminal connection type. (observe safety regulations)
Is "Door position" display near the specified value?
 | ▶ Go to "Check potentiometer" procedure. |
 | ▶ Substitute with a known-good Auto Defog actuator and check for proper operation. If the problem is corrected, replace Auto Defog actuator and then go to "Verification of Vehicle Repair" procedure. |
Ignition "OFF"
Connect Auto Defog actuator and A/C control Module main harness connector.
Ignition "ON"
Measure voltage between Signal(F/B) terminal of Auto Defog actuator harness connector and Sensor ground(-) terminal of A/C control Module harness connector .(Component side)
Specification : Refer the specifications in Fig.2)
Door position | Voltage |
CLOSE(VENT, B/L) | About 4.7V |
FLOOR | About 4.0V |
MIX | About 3.23V |
OPEN(DEF) | About 1.7V |
Fig.2) ※ Voltage value of Auto Defog actuator as a function of position of mode switch.
Is "voltage" display near the specified value?
| ▶ 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 Auto Defog actuator and check for proper operation. If the problem is corrected, replace Auto Defog actuator and then go to "Verification of Vehicle Repair" procedure. |
