Ignition "OFF"
Disconnect Driver Direction actuator and A/C control unit main harness connector.
Connect (+) terminal of battery to DEF (+) of Driver Direction actuator and (-) terminal to VENT (-). (Component side)
Verify that the Driver Direction actuator operates to the DEF position.
Verify that the Driver Direction actuator operates to the VENT position reversing the connection polarity.(VENT(+) and DEF(-) ) .(Component side)
Specification : Refer the specifications in Fig.1)
Actuator harness | DEF (+) | VENT (-) | Door position |
Battery terminal | 12 V | ground | DEF.Mode |
ground | 12 V | VENT.Mode |
FIG.1) ※ Function of the actuator motor according to terminal connection type. (observe safety regulations)
Is "Door position" display within specifications?
 | ▶ Go to "Check potentiometer" procedure. |
 | ▶ Substitute with a known-good Driver Direction actuator and check for proper operation. If the problem is corrected, replace Driver Direction actuator and then go to "Verification of Vehicle Repair" procedure. |
Ignition "OFF"
Connect Driver Direction actuator and A/C control unit main harness connector.
Ignition "ON"
Measure voltage between Signal(F/B) terminal of Driver Direction actuator harness connector and Sensor ground(-) terminal of A/C-ECU harness connector. (Component side)
Specification : Refer the specifications in Fig.2)
Mode Door Position | Voltage |
VENT | 0.4±0.3V |
BI-LEVEL | 1.45±0.3V |
FLOOR | 2.5±0.3V |
MIX | 3.55±0.3V |
DEF | 4.6±0.3V |
Fig.2) ※ Voltage value of Direction potentiometer as a function of position of mode switch
Is "voltage" display within specifications?
| ▶ 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 Driver air mix actuator and check for proper operation. If the problem is corrected, replace Driver air mix actuator and then go to "Verification of Vehicle Repair" procedure. |
