Nissan Titan A60. Instruction — part 608
MANUAL A/C IDENTIFICATION TABLE
HAC-115
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 1)]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
DTC/CIRCUIT DIAGNOSIS
MANUAL A/C IDENTIFICATION TABLE
Application Table
INFOID:0000000006164753
Instruction A/C Type
Description
Visual Identification
Instruction A/C (Type 1)
Two Control Dial System
Instruction A/C (Type 2)
Three Control Dial System
[with variable blower control
(VBC)]
AWIIA0481ZZ
AWIIA0478ZZ
HAC-116
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 1)]
MODE DOOR MOTOR
MODE DOOR MOTOR
System Description
INFOID:0000000006164754
SYSTEM DESCRIPTION
Component Parts
Mode door control system components are:
• Front air control
• Mode door motor
• Position balanced resistor (PBR) (built into mode door motor)
• 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.
COMPONENT DESCRIPTION
Mode Door Motor
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:0000000006164755
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-116, "Mode Door Motor Diagnosis Procedure"
Mode Door Motor Diagnosis Procedure
INFOID:0000000006164756
Regarding Wiring Diagram information, refer to
HAC-155, "Wiring Diagram - Instruction With 2 Control Dial Sys-
SYMPTOM:
• Air outlet does not change.
WJIA0587E
MODE DOOR MOTOR
HAC-117
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 1)]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
• 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-III, 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
1. Turn ignition switch OFF.
2. Disconnect the front air control harness connector M180 (A) and
the mode door motor harness connector M142 (B).
3. Check continuity between front air control harness connector
M180 (A) terminals 19, 20 and the mode door motor harness
connector M142 (B) terminals 5, 6.
4. Check continuity between front air control harness connector
M180 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
M180 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.
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 (
).
A
B
Continuity
Connector
Terminal
Connector
Terminal
M180
19
M142
5
Yes
20
6
Connector
Terminal
—
Continuity
M180
19
Ground
No
20
AWIIA0364ZZ
AWIIA0361ZZ
Connector
Terminals
Condition Voltage
(Approx.)
(+) (-)
M180
19
20
D/F (
) mode to VENT (
) mode
Battery voltage
20
19
VENT (
) mode to B/L (
) mode
Battery voltage
AWIIA0360ZZ
HAC-118
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 1)]
MODE DOOR MOTOR
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
M180 (C) terminal 3, and M181 (A) terminal 28 and the mode
door motor harness connector M142 (B) terminals 1, 3.
4. Check continuity between front air control harness connector
M180 (C) terminal 3, M181 (A) terminal 28 and ground.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair or replace harness as necessary.
5.
CHECK PBR FEEDBACK SIGNAL CIRCUIT FOR OPEN AND SHORT TO GROUND
1. Check continuity between front air control harness connector
M180 (A) terminal 7 and mode door motor harness connector
M142 (B) terminal 2.
2. Check continuity between front air control harness connector
M180 terminal 7 and ground.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Repair or replace harness as necessary.
6.
CHECK FRONT AIR CONTROL FOR 5 VOLT REFERENCE (VREF), VREF RETURN, AND FEEDBACK
SIGNAL
A and C
B
Continuity
Connector
Terminal
Connector
Terminal
M180 (C)
3
M142
3
Yes
M181 (A)
28
1
Connector
Terminal
—
Continuity
M180 (C)
3
Ground
No
M181 (A)
28
AWIIA0368ZZ
A
B
Continuity
Connector
Terminal
Connector
Terminal
M180
7
M142
2
Yes
AWIIA0371ZZ
Connector
Terminal
—
Continuity
M180
7
Ground
No
AWIIA0370ZZ
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