Ignition "OFF"
Disconnect auto defogger actuator and A/C control Module main harness connector.
Connect (+) terminal of battery to OPEN(+) of auto defogger actuator and (-) terminal to CLOSE(-) .(Component side)
Verify that the auto defogger actuator operates to the OPEN position.
Verify that the auto defogger 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 Next procedure. |
 | ▶ Substitute with a known-good auto defogger actuator and check for proper operation. If the problem is corrected, replace auto defogger actuator and then go to "Verification of Vehicle Repair" procedure. |
Ignition "OFF"
Connect auto defogger actuator and A/C control Module main harness connector.
Ignition "ON"
Measure voltage between Signal(F/B) terminal of auto defogger 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 3.94V |
MIX | About 3.29V |
OPEN(DEF) | About 1V |
Fig.2) Voltage value of auto defogger actuator as a function of door position.
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 defogger actuator and check for proper operation. If the problem is corrected, replace auto defogger actuator and then go to "Verification of Vehicle Repair" procedure. |
