Nissan Altima 2007-2012 Service Manual: Intake door motor
Description
SYSTEM DESCRIPTION
Component Parts
Intake door control system components are: • Front air control
• Intake door motor (LCU)
System Operation
The intake door control determines the intake door position based on the position of the recirculation switch.
When the recirculation switch is depressed the intake door motor rotates closing off the fresh air inlet and recirculating the cabin air. If the recirculation switch is depressed again, the intake door motor rotates in the opposite direction, again allowing fresh air into the cabin.
COMPONENT DESCRIPTION
Intake Door Motor
The intake door motor (1) is attached to the blower unit. It rotates so that air is drawn from inlets set by the front air control. Motor rotation is conveyed to a lever which activates the intake door.
Diagnosis Procedure
SYMPTOM: • Intake door does not change.
• Intake door motor does not operate normally.
INSPECTION FLOW
1. CONFIRM SYMPTOM BY PERFORMING OPERATION CHECK - REC (
)
1. Press the vent mode.( 
).
2. Press REC (
) switch. The REC
( 
) indicator should illumination.
3. Press REC ( 
) switch again. The
REC ( 
) indicator should go out.
4. Listen for intake door position change (you should sound change slightly).
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-102, "Operational Check".
Is the inspection result normal? YES >> Refer to HAC-155, "Symptom Matrix Chart".
NO >> System OK.
3. CHECK FOR SERVICE BULLETINS
Check for any service bulletins.
>> GO TO 4
4. CHECK INTAKE DOOR MOTOR OPERATION
Check and verify intake door mechanism for smooth operation.
Is the inspection result normal? YES >> GO TO 5
NO >> Repair as necessary.
5. CHECK LAN SYSTEM CIRCUIT
Perform diagnostic procedure for the LAN system. Refer to HAC-115, "Diagnosis Procedure".
Is the inspection result normal? YES >> GO TO 6
NO >> Repair as necessary.
6. CHECK AIR MIX DOOR MOTORS PBR CIRCUIT
Perform diagnostic procedure for the air mix door motor. Refer to HAC-122, "Diagnosis Procedure".
Is the inspection result normal? YES >> GO TO 7
NO >> Repair as necessary.
7. RECHECK FOR SYMPTOMS
Perform a complete operational check and check for any symptoms. Refer to HAC-102, "Operational Check".
Does another symptom exist? YES >> Repair as necessary.
NO >> Replace front air control. Refer to VTL-8, "Removal and Installation".
DIAGNOSIS PROCEDURE FOR INTAKE DOOR MOTOR
SYMPTOM: Intake door motor does not operate normally.
Perform diagnosis procedure. Refer to HAC-115, "Diagnosis Procedure".
Air mix door motor
Description
SYSTEM DESCRIPTION
Component Parts
Air mix door control system components are:
• Front air control
• Air mix door motor (LCU)
System Operation
The front air control receives use ...
Blower motor
Description
SYSTEM DESCRIPTION
Component Parts
Fan speed control system components are:
• Front air control
• A/C LAN system (PBR built-in mode door motor, air mix door motor and intake
do ...
Other materials:
Shift position indicator circuit
Description
• TCM sends position indicator signals to combination meter by CAN
communication line.
• Manual mode switch position is indicated on shift position indicator.
Component Function Check
1.CHECK SHIFT POSITION INDICATOR
CAUTION:
Always drive vehicle at a safe speed.
1. Sta ...
B2110 PNP/clutch interlock switch
Description
IPDM E/R confirms the shift position with the following signals.
• Park/neutral position (PNP) switch (CVT models)
• Clutch inter lock switch (M/T models)
• Shift position signal from BCM (CAN)
DTC Logic
DTC DETECTION LOGIC
NOTE:
• If DTC B2110 is displayed with DTC U10 ...
Bose speaker AMP
Diagnosis Procedure
1.CHECK FUSE
Check for blown fuses.
Are the fuses OK?
YES >> GO TO 2
NO >> Be sure to eliminate cause of malfunction before installing new fuse.
2.CHECK POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect BOSE speaker amp connector.
3. Chec ...