Nissan Altima L32. Instruction — part 836
HAC-118
< COMPONENT DIAGNOSIS >
[MANUAL AIR CONDITIONER]
MODE DOOR MOTOR
MODE DOOR MOTOR
Description
INFOID:0000000004498269
SYSTEM DESCRIPTION
Component Parts
Mode door control system components are:
• Front air control
• Mode door motor (LCU)
System Operation
The front air control receives user inputs through its various dials and switches. 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 posi-
tion sensors are compared by the LCU's in each motor with the existing decision and opening angles. Subse-
quently, HOT/COLD or DEFROST/VENT or FRESH/RECIRCULATION operation is selected. The new
selection data is returned to the front air control.
COMPONENT DESCRIPTION
Mode Door Motor
AWIIA0043GB
MODE DOOR MOTOR
HAC-119
< COMPONENT DIAGNOSIS >
[MANUAL AIR CONDITIONER]
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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 acti-
vates the mode door.
Diagnosis Procedure
INFOID:0000000004498270
SYMPTOM: Mode door motor and/or air mix door motor does not operate normally.
Perform diagnostic procedure for LAN system circuit. Refer to
HAC-115, "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 indica-
tor should illuminate.
2. Confirm that discharge air comes out according to the air distribution table. Refer to
.
NOTE:
Confirm that the 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
N0
>> GO TO 2
2.
PERFORM COMPLETE OPERATIONAL CHECK
Perform a complete operational check and check for any symptoms. Refer to
.
Can a symptom be duplicated?
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 LAN SYSTEM CIRCUIT
Perform diagnostic procedure for the LAN system. Refer to
HAC-115, "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 AIR MIX DOOR MOTOR PBR CIRCUIT
AWIIA0022ZZ
HAC-120
< COMPONENT DIAGNOSIS >
[MANUAL AIR CONDITIONER]
MODE DOOR MOTOR
Perform diagnostic procedure for the intake sensor circuit. 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
.
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
AIR MIX DOOR MOTOR
HAC-121
< COMPONENT DIAGNOSIS >
[MANUAL AIR CONDITIONER]
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AIR MIX DOOR MOTOR
Description
INFOID:0000000004498271
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 user inputs through its various dials and switches. 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 posi-
tion sensors are compared by the LCU's in each motor with the existing decision and opening angles. Subse-
quently, HOT/COLD or DEFROST/VENT or FRESH/RECIRCULATION operation is selected. The new
selection data is returned to the front air control.
COMPONENT DESCRIPTION
Air Mix Door Motor
The air mix door motor (1) is attached to the heater & cooling unit
assembly. It rotates so that the air mix door is opened or closed to a
position set by the front air control. Motor rotation is then conveyed
through a shaft and the air mix door position feedback is then sent to
the front air control by PBR built-in air mix door motor.
WJIA0922E
AWIIA0024ZZ
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