Nissan Altima L32. Instruction — part 814
HAC-30
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
LAN SYSTEM CIRCUIT
Is the inspection result normal?
YES
>> GO TO 6
NO
>> Replace harness or connector.
6.
CHECK MOTOR OPERATION
Disconnect and reconnect the motor connectors and confirm the motor operation.
Is the inspection result normal?
YES
>> (Returns to normal operation.)
• Motor connector contacts dirty or damaged
NO
>> (Does not operate normally.)
• GO TO 7
7.
CHECK MODE DOOR MOTOR AND AIR MIX DOOR MOTORS OPERATION
1. Disconnect the intake door motor connector.
2. Reconnect the mode door motor connector and air mix door motor connectors, confirm the mode door
motor and air mix door motors operation.
Is the inspection result normal?
YES
>> (Mode door motor and air mix door motors operate normally.)
• Replace the intake door motor. refer to
VTL-17, "Removal and Installation"
.
NO
>> (Mode door motor and air mix door motor do not operate normally.)
• GO TO 8
8.
CHECK AIR MIX DOOR MOTOR AND INTAKE DOOR MOTOR OPERATION
1. Disconnect mode door motor connector.
2. Reconnect the intake door motor connector, confirm the air mix door motors and intake door motor opera-
tion.
Is the inspection result normal?
YES
>> (Air mix door motors and intake door motor operate normally.)
• Replace mode door motor. Refer to
VTL-18, "Removal and Installation"
NO
>> (Air mix door motors and intake door motor do not operate normally.)
• GO TO 9
9.
CHECK INTAKE DOOR MOTOR AND MODE DOOR MOTOR OPERATION
1. Disconnect air mix door motor connectors.
2. Reconnect mode door motor connector, confirm the intake door motor and mode door motor operation.
Is the inspection result normal?
YES
>> (Intake door motor and mode door motor operate normally.)
• Replace inoperative air mix door motor. Refer to
VTL-19, "Removal and Installation"
NO
>> (Intake door motor and mode door motor do not operate normally.)
• Replace front air control. Refer to
VTL-8, "Removal and Installation"
.
MODE DOOR MOTOR
HAC-31
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
MODE DOOR MOTOR
Description
INFOID:0000000004498203
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 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.
Mode Door Control Specification
AWIIA0021GB
WJIA0886E
HAC-32
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
MODE DOOR MOTOR
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 acti-
vates the mode door.
Diagnosis Procedure
INFOID:0000000004498204
SYMPTOM: Mode door motor and/or air mix door motor does not operate normally.
Perform diagnostic procedure for LAN system circuit. Refer to
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 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 Condi-
.
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
.
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?
AWIIA0022ZZ
MODE DOOR MOTOR
HAC-33
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
YES
>> GO TO 6
NO
>> Repair as necessary.
6.
CHECK AMBIENT SENSOR CIRCUIT
Perform diagnostic procedure for the mode door motor. Refer to
.
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
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
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
.
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
.
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 Condi-
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
.
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