Nissan Frontier. Manual — part 869
HAC-30
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
AIR MIX DOOR MOTOR
2. Using CONSULT, check "PAS MIX FDBCK" in "DATA MONITOR" mode in "HVAC". Refer to
3. Observe "PAS MIX FDBCK" voltage while rotating temperature control dial (passenger) between 32
°C
(90
°F) and 18°C (60°F).
Is the inspection result normal?
YES
>> • Air mix door motor (passenger) is OK.
• Inspect air mix door (passenger) for mechanical failure and repair if necessary. If air mix door
(passenger) is OK, refer to
HAC-73, "Component Function Check"
for insufficient cooling or
HAC-81, "Component Function Check"
for insufficient heating.
NO
>> GO TO 2.
2.
CHECK AIR MIX DOOR MOTOR (PASSENGER) CIRCUITS FOR OPEN AND SHORT TO GROUND
1. Turn ignition switch OFF.
2. Disconnect the front air control harness connector M52 and the air mix door motor (passenger) harness
connector M131.
3. Check continuity between front air control harness connector M52 terminals 2, 14 and the air mix door
motor (passenger) harness connector M131 terminals 5, 6.
4. Check continuity between front air control harness connector
M52 terminals 2, 14 and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace harness as necessary.
3.
CHECK FRONT AIR CONTROL FOR AIR MIX DOOR MOTOR (PASSENGER) POWER AND GROUND
1. Reconnect front air control harness connector.
2. Turn ignition switch ON.
3. Rotate temperature control dial (passenger) to 32
°C (90°F).
4. Check voltage between front air control harness connector M52
terminal 2 and terminal 14 while rotating temperature control dial
(passenger) to 18
°C (60°F) and back to 32°C (90°F).
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Replace front air control Refer to
VTL-7, "Removal and Installation"
Monitor Item
Condition
Results
PAS MIX FDBCK
Rotate temperature control dial (passenger) be-
tween 32
°C (90°F) and 18°C (60°F)
Voltage varies between 0.2 and 4.8 volts.
Connector
Terminal
Connector
Terminal
Continuity
M52
14
M131
6
Yes
2
5
Connector
Terminal
—
Continuity
M52
14
Ground
No
2
AWIIA0386ZZ
Connector
Terminals
Condition Voltage
(Approx.)
(+) (-)
M52
2
14
While rotating temperature control dial
(passenger) from 32
°C (90°F) to 18°C
(60
°F)
Battery voltage
14
2
While rotating temperature control dial
(passenger) from 18
°C (60°F) to 32°C
(90
°F)
Battery voltage
AWIIA0385ZZ
AIR MIX DOOR MOTOR
HAC-31
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
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M
A
B
HAC
N
O
P
4.
CHECK AIR MIX DOOR MOTOR (PASSENGER) 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 air
mix door motor (passenger) harness connector M131 terminals 3, 1.
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
1. Check continuity between front air control harness connector M56 terminal 29 and air mix door motor
(passenger) harness connector M131 terminal 2.
2. Check continuity between front air control harness connector
M56 terminal 29 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.
Connector
Terminal
Connector
Terminal
Continuity
M52
3
M131
3
Yes
M56
28
1
Connector
Terminal
—
Continuity
M52
3
Ground
No
M56
28
Connector
Terminal
Connector
Terminal
Continuity
M56
29
M131
2
Yes
Connector
Terminal
—
Continuity
M56
29
Ground
No
AWIIA0132ZZ
A
B
Connector
Terminals
Connector
Terminals
Voltage (Approx.)
(+)
(-)
M56
28
M52
3
5 Volts
AWIIA0813ZZ
HAC-32
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
AIR MIX DOOR MOTOR
4. Check voltage between front air control harness connector M56
terminal 29 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 air mix door motor (passenger) harness connec-
tor M131.
2. Check voltage between front air control harness connector M56
terminal 29 and ground.
Is the inspection result normal?
YES
>> Inspect air mix door (passenger) for binding or mechani-
cal failure. If air mix door (passenger) moves freely,
replace front air control. Refer to
NO
>> Replace the air mix door motor (passenger). Refer to
VTL-23, "Removal and Installation"
Connector
Terminal
—
Voltage (Approx.)
M56
29
Ground
0 Volts
AWIIA0131ZZ
Connector
Terminal
—
Voltage (Approx.)
M56
29
Ground
0.2 to 4.8 Volts
AWIIA0131ZZ
INTAKE DOOR MOTOR
HAC-33
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
INTAKE DOOR MOTOR
System Description
INFOID:0000000009478282
SYSTEM DESCRIPTION
SYMPTOM:
• Intake door motor does not operate normally.
• Intake door does not change.
SYSTEM DESCRIPTION
Component Parts
Intake door control system components are:
• Front air control
• Intake door motor (PRB built into the intake door motor)
• In-vehicle sensor
• Ambient sensor
• Optical sensor
• Intake sensor
System Operation
The intake door control determines the intake door position based on the position of the recirculation switch.
When the recirculation switch is depressed the intake door motor rotates closing off the fresh air inlet and
recirculating the cabin air. If the recirculation switch is depressed again, the intake door motor rotates in the
opposite direction, again allowing fresh air into the cabin.
In the AUTO mode, the front air control determines the intake door position based on the ambient tempera-
ture, the intake air temperature and the in-vehicle temperature. When the DEF, D/F, FOOT or OFF switches
are pushed, the front air control sets the intake door at the fresh position.
Intake Door Control Specification
COMPONENT DESCRIPTION
WJIA1915E
WJIA0436E
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