Nissan Titan. Manual — part 379
SELF-DIAGNOSIS FUNCTION
HAC-21
< SYSTEM DESCRIPTION >
[AUTOMATIC AIR CONDITIONER]
C
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F
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HAC
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SELF-DIAGNOSIS FUNCTION
Front Air Control Self-Diagnosis
INFOID:0000000009882446
A/C SYSTEM SELF-DIAGNOSIS FUNCTION
The self-diagnosis function is built into the front air control to quickly locate the cause of malfunctions.
DESCRIPTION
The self-diagnostic system diagnoses sensors, CAN system, and battery voltage on front air control Refer to
applicable sections (items) for details. Fault codes (if any are present) will be displayed in the ambient temper-
ature display area. Refer to
HAC-21, "Front Air Control Self-Diagnosis Code Chart"
.
SELF-DIAGNOSTIC MODE
1. Press the OFF switch.
2. Press the FLOOR/DEF (
) and DEF (
) mode switches
together and release on the front air control.
3. Press the REC (
) to enter self diagnostic mode.
4. Turn ignition switch OFF to exit out of self-diagnostic mode.
Front Air Control Self-Diagnosis Code Chart
INFOID:0000000009882447
SELF-DIAGNOSTIC CODE CHART
AWIIA0938ZZ
Code No.
Reference page
03
Battery voltage out of range
CHG-4, "Work Flow (With EXP-800 NI or GR8-1200 NI)"
or
CHG-7, "Work Flow (Without EXP-800 NI or GR8-1200 NI)"
30
In-vehicle sensor circuit out of range (low)
HAC-59, "In-Vehicle Sensor Diagnosis Procedure"
31
In-vehicle sensor circuit out of range (high)
40
Ambient sensor circuit short
HAC-56, "Ambient Sensor Diagnosis Procedure"
41
Ambient sensor circuit open
50
Optical sensor (Driver) circuit open or short
HAC-62, "Optical Sensor Diagnosis Procedure"
52
Optical sensor (Passenger) circuit open or short
56
Intake sensor circuit short
HAC-64, "Intake Sensor Diagnosis Procedure"
57
Intake sensor circuit open
80
CAN bus fault
LAN-14, "Trouble Diagnosis Flow Chart"
90
Stuck button
HAC-22
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
MODE DOOR MOTOR
DTC/CIRCUIT DIAGNOSIS
MODE DOOR MOTOR
System Description
INFOID:0000000009882448
SYSTEM DESCRIPTION
Component Parts
Mode door control system components are:
• Front air control
• Mode door motor
• PBR (built into mode door motor)
• In-vehicle sensor
• Ambient sensor
• Optical sensor
• Intake sensor
System Operation
The mode door position (vent, B/L, foot, D/F, and defrost) is set by the front air control by means of the mode
door motor. When a mode door position is selected on the front air control, voltage is applied to one circuit of
the mode door motor while ground is applied to the other circuit, causing the mode door motor to rotate. The
direction of rotation is determined by which circuit has voltage applied to it, and which one has ground applied
to it. The front air control monitors the mode door position by measuring the voltage signal on the PBR circuit.
In AUTO mode the mode door position is set by the front air control which determines the proper position
based on inputs from the in-vehicle sensor, ambient sensor, optical sensor, intake sensor, and the temperature
selected by the driver or passenger.
Mode Door Control Specification
COMPONENT DESCRIPTION
Mode Door Motor
WJIA1240E
WJIA0434E
MODE DOOR MOTOR
HAC-23
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
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HAC
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The mode door motor is attached to the heater & cooling unit assem-
bly. It rotates so that air is discharged from the outlet as indicated by
the front air control. Motor rotation is conveyed to a link which acti-
vates the mode door.
Mode Door Motor Component Function Check
INFOID:0000000009882449
INSPECTION FLOW
1.
CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - DISCHARGE AIR
1. Press each mode switch and press the
(DEF) switch. Each position indicator 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.
Is the inspection result normal?
YES
>> Inspection End.
NO
>> Go to diagnosis procedure. Refer to
HAC-23, "Mode Door Motor Diagnosis Procedure"
.
Mode Door Motor Diagnosis Procedure
INFOID:0000000009882450
Regarding Wiring Diagram information, refer to
HAC-71, "Wiring Diagram - Automatic Air Conditioner"
SYMPTOM:
• Air outlet does not change.
• Mode door motor does not operate normally.
1.
CHECK MODE DOOR MOTOR POSITION BALANCED RESISTOR (PBR) FEEDBACK VOLTAGE
1. Turn ignition switch ON.
2. Using CONSULT, check "MODE FDBCK" in "DATA MONITOR" mode in "HVAC". Refer to
.
3. Observe "MODE FDBCK" voltage while cycling front air control mode switch through all modes.
Is the inspection result normal?
YES
>> • Mode door motor is OK.
• Inspect mode door for mechanical failure. Refer to
VTL-19, "Removal and Installation"
NO
>> GO TO 2.
2.
CHECK MODE DOOR MOTOR CIRCUITS FOR OPEN AND SHORT TO GROUND
WJIA0587E
Monitor Item
Condition
Results
MODE FDBCK
Cycle mode switch through all modes, D/F
(
), VENT (
), B/L (
), and FOOT(
)
Voltage varies between D/F (
) and VENT (
), and
between VENT (
) and B/L (
).
HAC-24
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
MODE DOOR MOTOR
1. Turn ignition switch OFF.
2. Disconnect the front air control harness connector M49 (A) and
the mode door motor harness connector M142 (B).
3. Check continuity between front air control harness connector
M49 (A) terminals 19, 20 and the mode door motor harness con-
nector M142 (B) terminals 5, 6.
4. Check continuity between front air control harness connector
M49 terminals 19, 20 and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace harness as necessary.
3.
CHECK FRONT AIR CONTROL FOR MODE DOOR MOTOR POWER AND GROUND
1. Reconnect front air control harness connector.
2. Turn ignition switch ON.
3. Press the mode switch to the D/F (
) mode.
4. Check voltage between front air control harness connector M49
terminal 19 and terminal 20 while pressing the mode switch to
the VENT (
), and then the B/L (
) mode.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Replace front air control. Refer to
VTL-8, "Removal and Installation"
.
4.
CHECK MODE DOOR MOTOR PBR CIRCUITS FOR OPEN AND SHORT TO GROUND
1. Turn ignition switch OFF.
2. Disconnect the front air control harness connectors.
3. Check continuity between front air control harness connector
M49 (C) terminal 3, and M50 (A) terminal 28 and the mode door
motor harness connector M142 (B) terminals 1, 3.
4. Check continuity between front air control harness connector
M49 (C) terminal 3, M50 (A) terminal 28 and ground.
A
B
Continuity
Connector
Terminal
Connector
Terminal
M49
19
M142
5
Yes
20
6
Connector
Terminal
—
Continuity
M49
19
Ground
No
20
AWIIA0364ZZ
AWIIA0361ZZ
Connector
Terminals
Condition Voltage
(Approx.)
(+) (-)
M49
19
20
D/F (
) mode to VENT (
) mode
Battery voltage
20
19
VENT (
) mode to B/L (
) mode
Battery voltage
AWIIA0360ZZ
A and C
B
Continuity
Connector
Terminal
Connector
Terminal
M49 (C)
3
M142
3
Yes
M50 (A)
28
1
AWIIA0368ZZ
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