Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSSUBARU1996LEGACY WAGON 4WD F4-2.2L SOHCREPAIR AND DIAGNOSISHEATING AND AIR CONDITIONINGCONTROL ASSEMBLYDESCRIPTION AND OPERATIONMODE DOOR CONTROL
1996 Subaru Legacy Wagon 4WD F4-2.2L SOHC
Mode Door Control
1996 Subaru Legacy Wagon 4WD F4-2.2L SOHCSECTION Mode Door Control
Mode Door Control
The mode door motor is located on the left side of the heater unit.
It opens and closes the vent, heater and defroster doors through side links.
Operation
1) When motor is stopped:
Both the mode switch and the position switch in mode door motor move together Current flows from the position switch in the mode door motor to body ground through IC circuits A and B which switch off the mode door motor
2) When motor is operating:
Current flows to mode door motor from IC circuits A or B whichever corresponds with the pressed mode switch.
While circuit A becomes minus circuit, 12 volts exists at mode door motor terminal (10) and terminal (9) of mode door motor becomes body ground in circuit B.
As a result, the motor and switch moving contact move together forward DEF position.
While circuit B becomes minus circuit, 12 bolts exists at terminal (9) and terminal (10) of mode door motor becomes body ground in circuit A.
As a result, the motor and switch moving contact move together forward VENT position.
3) After the switch moving contact teaches DEF or VENT position, a short circuit between circuits A and B is completed.
Then the motor operation stops.
The mode door motor is located on the left side of the heater unit.
It opens and closes the vent, heater and defroster doors through side links.
Operation
1) When motor is stopped:
Both the mode switch and the position switch in mode door motor move together Current flows from the position switch in the mode door motor to body ground through IC circuits A and B which switch off the mode door motor
2) When motor is operating:
Current flows to mode door motor from IC circuits A or B whichever corresponds with the pressed mode switch.
While circuit A becomes minus circuit, 12 volts exists at mode door motor terminal (10) and terminal (9) of mode door motor becomes body ground in circuit B.
As a result, the motor and switch moving contact move together forward DEF position.
While circuit B becomes minus circuit, 12 bolts exists at terminal (9) and terminal (10) of mode door motor becomes body ground in circuit A.
As a result, the motor and switch moving contact move together forward VENT position.
3) After the switch moving contact teaches DEF or VENT position, a short circuit between circuits A and B is completed.
Then the motor operation stops.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.