Nissan Frontier. Instruction — part 887
HAC-102
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 1)]
MANUAL A/C IDENTIFICATION TABLE
DTC/CIRCUIT DIAGNOSIS
MANUAL A/C IDENTIFICATION TABLE
Application Table
INFOID:0000000009478334
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
MODE DOOR MOTOR
HAC-103
< 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
System Description
INFOID:0000000009478335
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:0000000009478336
SYMPTOM:
• Air outlet does not change.
• Mode door motor does not operate normally.
INSPECTION FLOW
WJIA1314E
WJIA1484E
HAC-104
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 1)]
MODE DOOR MOTOR
1.
CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - DISCHARGE AIR
1. Turn blower control dial to HI speed.
2. Press each mode switch 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 diagnosis procedure. Refer to
HAC-104, "Mode Door Motor Diagnosis Procedure"
.
Mode Door Motor Diagnosis Procedure
INFOID:0000000009478337
Regarding Wiring Diagram information, refer to
HAC-133, "Wiring Diagram - With Type 1"
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 M50 (A) and the mode door motor harness connector
M142 (B).
3. Check continuity between front air control harness connector M50 (A) terminals 23, 24 and the mode door
motor harness connector M142 (B) terminals 1, 6.
4. Check continuity between front air control harness connector M50 terminals 23, 24 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. Press the mode switch D/F (
) mode.
4. Check voltage between front air control harness connector M50 terminal 23 and terminal 24 while press-
ing the VENT (
) mode, and then the B/L (
) mode.
A
B
Continuity
Connector
Terminal
Connector
Terminal
M50
24
M142
1
Yes
23
6
Connector
Terminal
—
Continuity
M50
24
Ground
No
23
MODE DOOR MOTOR
HAC-105
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 1)]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Replace front air control. Refer to
VTL-7, "Removal and Installation"
.
3.
CHECK MODE DOOR MOTOR PBR CIRCUITS FOR OPEN AND SHORT TO GROUND
1. Turn ignition switch OFF.
2. Disconnect the front air control harness connector M50 and M59.
3. Check continuity between front air control harness connector M50 (A) terminal 3 and 59 (A) terminal 28,
and the mode door motor harness connector M142 (B) terminals 2, 3.
4. Check continuity between front air control harness connector M50 (A) terminal 3 and M59 (A) terminal 28,
and ground.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair or replace harness as necessary.
4.
CHECK PBR FEEDBACK SIGNAL CIRCUIT FOR OPEN AND SHORT TO GROUND
1. Check continuity between front air control harness connector M50 (A) terminal 10 and mode door motor
harness connector M142 (B) terminal 4.
2. Check continuity between front air control harness connector M50 (A) terminal 10 and ground.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Repair or replace harness as necessary.
5.
CHECK FRONT AIR CONTROL FOR 5 VOLT REFERENCE (VREF), VREF RETURN, AND FEEDBACK
SIGNAL
1. Reconnect front air control harness connectors.
2. Turn ignition switch ON.
3. Check voltage between front air control harness connector M50 terminal 3 and M59 terminal 28.
Connector
Terminals
Condition Voltage
(Approx.)
(+) (-)
M50
24
23
While pressing the mode control from
D/F (
) mode to VENT (
) mode
Battery voltage
23
24
While pressing the mode control from
VENT (
) mode to B/L (
) mode
Battery voltage
A
B
Continuity
Connector
Terminal
Connector
Terminal
M50
3
M142
2
Yes
M59
28
3
Connector
Terminal
—
Continuity
M50 (A)
3
Ground
No
M59 (A)
28
A
B
Continuity
Connector
Terminal
Connector
Terminal
M50
10
M142
4
Yes
Connector
Terminal
—
Continuity
M50 (A)
10
Ground
No
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