Nissan Altima 2007-2012 Service Manual: Mode door motor
Description
SYSTEM DESCRIPTION
Component Parts
Mode door control system components are: • Front air control
• Mode door motor (LCU)
• In-vehicle sensor
• Ambient sensor
• Sunload sensor
• Intake sensor
System Operation
The front air control receives data from each of the sensors. The front air control sends air mix door, mode door and intake door opening angle data to the air mix door motor LCU, mode door motor LCU and intake door motor LCU.
The air mix door motor, mode door motor and intake door motor read their respective signals according to the address signal. Opening angle indication signals received from the front air control and each of the motor position sensors are compared by the LCU's in each motor with the existing decision and opening angles. Subsequently, HOT/COLD or DEFROST/VENT or FRESH/RECIRCULATION operation is selected. The new selection data is returned to the front air control.
Mode Door Control Specification
COMPONENT DESCRIPTION
Mode Door Motor
The mode door motor (1) is attached to the heater and cooling unit assembly. It rotates so that air is discharged from the outlet set by the front air control. Motor rotation is conveyed to a link which activates the mode door.
Diagnosis Procedure
SYMPTOM: Mode door motor and/or air mix door motor does not operate normally.
Perform diagnostic procedure for LAN system circuit. Refer to HAC-28, "Diagnosis Procedure".
SYMPTOM: • Air outlet does not change.
• Mode door motor does not operate normally.
INSPECTION FLOW
1. CONFIRM SYMPTOM BY PERFORMING OPERATION CHECK - DISCHARGE AIR
1. Press each of the four mode position switches and then press the
(DEF) switch. Each position
indicator
should illuminate.
2. Confirm that discharge air comes out according to the air distribution table. Refer to HAC-14, "System Description".
NOTE:
Confirm that the A/C compressor clutch is engaged (visual inspection and intake
door position is at
(FRESH) when
(DEF) or
(D/F) is selected.
Can a symptom be duplicated? YES >> GO TO 3
NO >> GO TO 2
2. PERFORM COMPLETE OPERATIONAL CHECK
Perform a complete operational check and check for any symptoms. Refer to HAC-5, "Description and Conditions".
Can a symptom be duplicated? YES >> Refer to HAC-83, "Symptom Matrix Chart".
NO >> System OK.
3. CHECK FOR SERVICE BULLETINS
Check for any service bulletins.
>> GO TO 4
4. CHECK LAN SYSTEM CIRCUIT
Perform diagnostic procedure for the LAN system. Refer to HAC-28, "Diagnosis Procedure".
Is the inspection result normal? YES >> GO TO 5
NO >> Repair as necessary.
5. CHECK MODE DOOR OPERATION
Check and verify mode door mechanism for smooth operation in each mode.
Is the inspection result normal?
YES >> GO TO 6
NO >> Repair as necessary.
6. CHECK AMBIENT SENSOR CIRCUIT
Perform diagnostic procedure for the mode door motor. Refer to HAC-32, "Diagnosis Procedure".
Is the inspection result normal? YES >> GO TO 7
NO >> Repair as necessary.
7. CHECK IN-VEHICLE SENSOR CIRCUIT
Perform diagnostic procedure for the in-vehicle sensor circuit. Refer to HAC-53, "Diagnosis Procedure".
Is the inspection result normal? YES >> GO TO 8
NO >> Repair as necessary.
8. CHECK SUNLOAD SENSOR CIRCUIT
Perform diagnostic procedure for the sunload sensor circuit. Refer to HAC-56, "Diagnosis Procedure".
Is the inspection result normal? YES >> GO TO 9
NO >> Repair as necessary
9. CHECK INTAKE SENSOR CIRCUIT
Perform diagnostic procedure for the intake sensor circuit. Refer to HAC-59, "Diagnosis Procedure".
Is the inspection result normal? YES >> GO TO 10
NO >> Repair as necessary.
10. CHECK AIR MIX DOOR MOTOR PBR CIRCUIT
Perform diagnostic procedure for the intake sensor circuit. Refer to HAC-35, "Diagnosis Procedure".
Is the inspection result normal? YES >> GO TO 11
NO >> Repair as necessary.
11. RECHECK FOR SYMPTOMS
Perform a complete operational check and check for any symptoms. Refer to HAC-5, "Description and Conditions".
Does another symptom exist? YES >> Repair as necessary.
NO >> Replace front air control. Refer to VTL-8, "Removal and Installation".
DIAGNOSIS PROCEDURE FOR MODE DOOR MOTOR
SYMPTOM: Mode door motor does not operate normally.
Perform diagnosis procedure. Refer to HAC-28, "Diagnosis Procedure".
Lan system circuit
Description
SYMPTOM: Mode door motor, intake door motor and/or air mix door motor does
not operate normally.
Diagnosis Procedure
DIAGNOSIS PROCEDURE FOR LAN CIRCUIT
1.CHECK POWER SUPPLY FOR D ...
Air mix door motor
Description
SYSTEM DESCRIPTION
Component Parts
Air mix door control system components are:
• Front air control
• Air mix door motors (LCU)
• In-vehicle sensor
• Ambient sensor
• Sun ...
Other materials:
Precaution
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TENSIONER"
The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”,
used along
with a front seat belt, helps to reduce the risk or severity of injury to the
dr ...
P0448 evap canister vent control
valve
Description
The EVAP canister vent control valve is located on the EVAP canister
and is used to seal the canister vent.
This solenoid valve responds to signals from the ECM. When the
ECM sends an ON signal, the coil in the solenoid valve is energized.
A plunger will then move to seal the c ...
Magnet clutch
Description
SYSTEM DESCRIPTION
Front air control controls A/C compressor operation by ambient temperature
and signal from ECM.
Low Temperature Protection Control
Front air control will turn the A/C compressor ON or OFF as determined
by a signal detected by ambient sensor.
When ambient te ...