Nissan Titan A60. Instruction — part 628
DIAGNOSIS SYSTEM (BCM)
HAC-195
< SYSTEM DESCRIPTION >
[MANUAL A/C (TYPE 2)]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
Monitor Item [Unit]
Description
IGN ON SW [On/Off]
Indicates condition of ignition switch ON position.
FAN ON SIG [On/Off]
Indicates condition of fan switch.
AIR COND SW [On/Off]
Indicates condition of A/C switch.
HAC-196
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 2)]
MANUAL A/C IDENTIFICATION TABLE
DTC/CIRCUIT DIAGNOSIS
MANUAL A/C IDENTIFICATION TABLE
Application Table
INFOID:0000000006164812
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
MODE DOOR MOTOR
HAC-197
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 2)]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
MODE DOOR MOTOR
System Description
INFOID:0000000006164813
SYSTEM DESCRIPTION
Component Parts
Mode door control system components are:
• Front air control
• Mode door motor
• 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:0000000006164814
INSPECTION FLOW
1.
CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - DISCHARGE AIR
1. Rotate the mode control dial and check each position and press the
(DEF) mode.
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-197, "Mode Door Motor Diagnosis Procedure"
Mode Door Motor Diagnosis Procedure
INFOID:0000000006164815
Regarding Wiring Diagram information, refer to
HAC-232, "Wiring Diagram - Instruction With 3 Control Dial Sys-
SYMPTOM:
• Air outlet does not change.
WJIA0587E
HAC-198
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 2)]
MODE DOOR MOTOR
• Mode door motor does not operate normally.
1.
CHECK MODE DOOR MOTOR CIRCUITS FOR OPEN AND SHORT TO GROUND
1. Turn ignition switch OFF.
2. Disconnect the front air control harness connector M176 (A) and
the mode door motor harness connector M142 (B).
3. Check continuity between front air control harness connector
M176 (A) terminals 5, 6 and the mode door motor harness con-
nector M142 (B) terminals 5, 6.
4. Check continuity between front air control harness connector
M176 terminals 5, 6 and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace harness as necessary.
2.
CHECK FRONT AIR CONTROL FOR MODE DOOR MOTOR POWER AND GROUND
1. Reconnect front air control harness connector.
2. Turn ignition switch ON.
3. Rotate the mode switch to the D/F (
) mode.
4. Check voltage between front air control harness connector
M176 terminal 5 and terminal 6 while rotating the mode control
dial 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"
.
3.
CHECK MODE DOOR MOTOR PBR CIRCUITS FOR OPEN AND SHORT TO GROUND
A
B
Continuity
Connector
Terminal
Connector
Terminal
M176
5
M142
5
Yes
6
6
Connector
Terminal
—
Continuity
M176
5
Ground
No
6
AWIIA0493ZZ
AWIIA0490ZZ
Connector
Terminals
Condition Voltage
(Approx.)
(+) (-)
M176
5
6
Rotating the mode control dial from
D/F (
) mode to VENT (
) mode
Battery voltage
6
5
Rotating the mode control dial from
VENT (
) mode to B/L (
) mode
Battery voltage
AWIIA0489ZZ
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