Nissan Frontier. Instruction — part 904
HAC-170
< SYSTEM DESCRIPTION >
[MANUAL A/C (TYPE 2)]
DIAGNOSIS SYSTEM (BCM)
AIR CONDITIONER : CONSULT Function (BCM - AIR CONDITIONER)
INFOID:0000000009478383
DATA MONITOR
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.
MANUAL A/C IDENTIFICATION TABLE
HAC-171
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 2)]
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:0000000009478384
Instruction A/C Type
Description
Visual Identification
Instruction A/C (Type 1)
Two Control Dial System
[with variable blower control
(VBC)]
Instruction A/C (Type 2)
Three Control Dial System
[without variable blower con-
trol (VBC)]
AWIIA0481ZZ
AWIIA1228ZZ
HAC-172
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 2)]
MODE DOOR MOTOR
MODE DOOR MOTOR
System Description
INFOID:0000000009478385
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 and cooling unit
assembly. It rotates so that air is discharged from the outlet as indi-
cated by the front air control. Motor rotation is conveyed to a link
which activates the mode door.
Mode Door Motor Component Function Check
INFOID:0000000009478386
SYMPTOM:
• Air outlet does not change.
• Mode door motor does not operate normally.
INSPECTION FLOW
WJIA1314E
WJIA1484E
MODE DOOR MOTOR
HAC-173
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 2)]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
1.
CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - DISCHARGE AIR
1. Turn blower control dial to 4.
2. Turn the mode dial and check all positions.
3. 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 the diagnosis procedure. Refer to
HAC-173, "Mode Door Motor Diagnosis Procedure"
.
Mode Door Motor Diagnosis Procedure
INFOID:0000000009478387
Regarding Wiring Diagram information, refer to
HAC-200, "Wiring Diagram - With Type 2"
.
SYMPTOM:
• Air outlet does not change.
• 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 M49 and the
mode door motor harness connector M142.
3. Check continuity between front air control harness connector
M49 terminals 1, 14 and the mode door motor harness connec-
tor M142 terminals 1, 6.
4. Check continuity between front air control harness connector
M49 terminals 1, 14 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 M49 terminal 1 and terminal 14 while rotating
the mode control dial to the VENT (
), and then the B/L (
) mode.
Connector
Terminal
Connector
Terminal
Continuity
M49
1
M142
1
Yes
14
6
Connector
Terminal
—
Continuity
M49
1
Ground
No
14
WJIA1241E
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