Nissan Frontier. Manual — part 867
HAC-22
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
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:0000000009478275
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-22, "Mode Door Motor Diagnosis Procedure"
.
Mode Door Motor Diagnosis Procedure
INFOID:0000000009478276
Regarding Wiring Diagram information, refer to
HAC-63, "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-21, "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 M52 and the mode door motor harness connector
M142.
3. Check continuity between front air control harness connector M52 terminals 19, 20 and the mode door
motor harness connector M142 terminals 6, 1.
WJIA1484E
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 (
).
MODE DOOR MOTOR
HAC-23
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
4. Check continuity between front air control harness connector
M52 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 M52
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-7, "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 M52 terminal 3, and M56 terminal 28 and
the mode door motor harness connector M142 terminals 2, 3.
4. Check continuity between front air control harness connector M52 terminal 3, M56 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
Connector
Terminal
Connector
Terminal
Continuity
M52
19
M142
6
Yes
20
1
Connector
Terminal
—
Continuity
M52
19
Ground
No
20
AWIIA0361ZZ
Connector
Terminals
Condition Voltage
(Approx.)
(+) (-)
M52
19
20
D/F (
) mode to VENT (
) mode
Battery voltage
20
19
VENT (
) mode to B/L (
) mode
Battery voltage
AWIIA0360ZZ
Connector
Terminal
Connector
Terminal
Continuity
M52
3
M142
2
Yes
M56
28
3
Connector
Terminal
—
Continuity
M52
3
Ground
No
M56
28
HAC-24
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
MODE DOOR MOTOR
1. Check continuity between front air control harness connector M52 terminal 7 and mode door motor har-
ness connector M142 terminal 4.
2. Check continuity between front air control harness connector
M52 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
1. Reconnect front air control harness connectors.
2. Turn ignition switch ON.
3. Check voltage between front air control harness connector M52
(B) terminal 3, and M56 (A) terminal 28.
4. Check voltage between front air control harness connector M52
terminal 7 and ground.
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> Replace front air control. Refer to
7.
CHECK FRONT AIR CONTROL FOR FEEDBACK SIGNAL
1. Reconnect the mode door motor harness connector M142.
2. Check voltage between front air control harness connector M52
terminal 7 and ground.
Is the inspection result normal?
YES
>> Inspect mode door for binding or mechanical failure. If
mode door moves freely, replace front air control. Refer
to
VTL-7, "Removal and Installation"
.
NO
>> Replace the mode door motor. Refer to
.
Connector
Terminal
Connector
Terminal
Continuity
M52
7
M142
4
Yes
Connector
Terminal
—
Continuity
M52
7
Ground
No
AWIIA0370ZZ
A
B
Connector
Terminals
Connector
Terminals
Voltage (Approx.)
(+)
(-)
M56
28
M52
3
5 Volts
Connector
Terminal
—
Voltage (Approx.)
M52
7
Ground
0 Volts
AWIIA0813ZZ
AWIIA0369ZZ
Connector
Terminal
—
Voltage (Approx.)
M52
7
Ground
0.2 to 4.8 Volts
AWIIA0369ZZ
AIR MIX DOOR MOTOR
HAC-25
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
AIR MIX DOOR MOTOR
System Description
INFOID:0000000009478277
SYSTEM DESCRIPTION
SYMPTOM:
• Discharge air temperature does not change.
• Air mix door motor does not operate.
SYSTEM DESCRIPTION
Component Parts
Air mix door control system components are:
• Front air control
• Air mix door motors (driver, passenger)
• PBR (built-into air mix door motors)
• In-vehicle sensor
• Ambient sensor
• Optical sensor
• Intake sensor
System Operation
The front air control receives data from the temperature selected by the driver side, passenger side, and rear.
The front air control then applies a voltage to one circuit of the appropriate air mix door motor, while ground is
applied to the other circuit, causing the appropriate air mix 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 con-
trol monitors the air mix door positions by measuring the voltage signal on the PBR circuits of each door.
In AUTO mode the air mix, intake, mode door, and defrost door positions are 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 and front and rear passengers.
Subsequently, HOT/COLD or DEFROST/VENT or FRESH/RECIRCULATION operation is selected. The new
door position data is returned to the front air control
AWIIA0372GB
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