Nissan Altima L32. Instruction — part 812
HAC-22
< FUNCTION DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
SELF-DIAGNOSIS FUNCTION
SELF-DIAGNOSIS FUNCTION
Diagnosis Description
INFOID:0000000004498199
SELF-DIAGNOSIS SYSTEM
The self-diagnosis system is built into the front air control to quickly locate the cause of malfunctions.
SELF-DIAGNOSIS FUNCTION
The self-diagnosis system diagnoses sensors, door motors, blower motor, etc. by system line. Refer to appli-
cable sections (items) for details. Shifting from normal control to the self-diagnosis system is accomplished by
starting the engine (pressing the ignition switch to the ON position) and pressing OFF switch for at least 5 sec-
onds. The OFF switch must be pressed within 10 seconds after starting the engine (ignition switch is pressed
to the ON position). This system will be canceled by either pressing AUTO switch or pressing the ignition
switch OFF. Shifting from one step is accomplished by means of turning temperature control dial (LH side), as
required.
SELF-DIAGNOSIS FUNCTION
HAC-23
< FUNCTION DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
Shifting from STEP-5 to AUXILIARY MECHANISM is accomplished by turning the LH temperature control dial
clockwise or counterclockwise.
CONFIRMATION METHOD
1.
SET IN SELF-DIAGNOSIS MODE
1. Press ignition switch ON.
2. Set in self-diagnosis mode as follows. Within 10 seconds after starting engine (ignition switch is pressed
ON.), press OFF switch for at least 5 seconds.
NOTE:
AWIIA0609GB
HAC-24
< FUNCTION DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
SELF-DIAGNOSIS FUNCTION
• If battery voltage drops below 12 V during diagnosis STEP-3, door motor speed becomes slower and as a
result, the system may generate an error even when operation is normal. To avoid this, start engine before
performing this diagnosis.
• Former STEP-1 (LEDs and display screen are checked) does not exist in this self-diagnosis function.
>> GO TO 2
2.
STEP-2: SENSOR CIRCUITS ARE CHECKED FOR OPEN OR SHORT CIRCUIT
Does code No. 20 appear on the display?
YES
>> GO TO 3
NO
>> GO TO 12
3.
CHECK TO ADVANCE SELF-DIAGNOSIS STEP-3
Turn temperature control dial (LH) clockwise.
Advance to self-diagnosis STEP-3?
YES
>> GO TO 4
NO
>> Replace front air control. (Temperature control dial is malfunctioning.) Refer to
.
4.
CHECK TO RETURN SELF-DIAGNOSIS STEP-2
Turn temperature control dial (LH) counterclockwise.
Return to self-diagnosis STEP-2?
YES
>> GO TO 5
NO
>> Malfunctioning front air control. Refer to
VTL-8, "Removal and Installation"
5.
STEP-3: MODE DOOR AND INTAKE DOOR POSITIONS ARE CHECKED
Turn temperature control dial (LH) clockwise.
Does code No. 30 appear on the display?
YES
>> GO TO 6
NO
>> GO TO 13
6.
STEP-4: OPERATION OF EACH DOOR MOTOR IS CHECKED
1. Turn temperature control dial (LH side) clockwise.
2. Press
(DEF) switch. Code No. of each door motor test is
indicated on the display.
>> GO TO 7
SJIA1778E
SJIA1779E
SJIA1780E
SELF-DIAGNOSIS FUNCTION
HAC-25
< FUNCTION DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
7.
CHECK ACTUATORS
Refer to the following chart and check discharge air flow, air temperature, blower motor duty ratio and com-
pressor operation.
Checks must be made visually, by listening to the sound, or by touching air outlets with hand, etc. for improper
operation.
*1: FOOT position during automatic control. Refer to
HAC-5, "Description and Conditions"
.
Is the inspection result normal?
YES
>> GO TO 8
NO
>> • Air outlet does not change.
Go to Mode Door Motor Circuit. Refer to
.
• Discharge air temperature does not change.
Go to Air Mix Door Motor Circuit. Refer to
• Intake door does not change.
Go to Intake Door Motor Circuit. Refer to
.
• Blower motor operation is malfunctioning.
Go to Blower Motor Circuit. Refer to
.
• Magnet clutch does not engage.
Go to Magnet Clutch Circuit. Refer to
.
8.
STEP-5: TEMPERATURE OF EACH SENSOR IS CHECKED
1. Turn temperature control dial (LH) clockwise.
2. Code No. 51 appears on the display.
>> GO TO 9
9.
CHECK AMBIENT SENSOR
Press
(DEF) switch one time. Temperature detected by ambient
sensor is indicated on the display.
NOTE:
If the temperature indicated on the display greatly differs from the
actual temperature, check sensor circuit first, and then check sensor.
Is the inspection result normal?
YES
>> GO TO 10
NO
>> Go to Ambient Sensor Circuit. Refer to
.
Mode door position
Air outlet/distribution
Vent
Foot
Defroster
100%
—
—
44%
56%
—
17%
59%
24%
16%
52%
32%
12%
—
88%
Code No.
41
42
43
44
45
46
Mode door position
VENT
B/L 1
B/L 2
FOOT
*1
D/F
DEF
Intake door position
REC
REC
20% FRE
FRE
FRE
FRE
Air mix door position
FULL COOL
FULL COOL
FULL HOT
FULL HOT
FULL HOT
FULL HOT
Blower motor duty ratio
37%
91%
65%
65%
65%
91%
Compressor
ON
ON
OFF
OFF
ON
ON
PJIA0151E
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