Nissan Pathfinder (2012 year). Instruction — part 429
HAC-154
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL AIR CONDITIONER]
BLOWER MOTOR
Front Blower Motor Diagnosis Procedure
INFOID:0000000007356436
Regarding Wiring Diagram information, refer to
HAC-172, "Wiring Diagram - Instruction"
.
SYMPTOM: Blower motor operation is malfunctioning under starting
blower speed control.
1.
DIAGNOSTIC PROCEDURE
1. Turn ignition switch ON.
2. Turn the front blower switch to each of its four speeds.
Does blower motor rotate normally at each speed?
YES or NO
YES
>> Inspection End.
NO
>> 1. Does not rotate at any speed, GO TO 2.
2. Does not rotate at 1 - 3 speed, GO TO 13.
3. Does not rotate at 4 speed, GO TO 16.
2.
CHECK FUSES
1. Check 15A fuses (Nos. 24 and 27, located in the fuse and fusible link box). Refer to
.
2. Check 10A fuse [No. 8, located in the fuse block (JB)]. Refer to
.
Is inspection result normal?
YES
>> GO TO 3.
NO
>> GO TO 8.
3.
CHECK FRONT BLOWER MOTOR POWER SUPPLY
WJIA1503E
August 2012
2012 Pathfinder
BLOWER MOTOR
HAC-155
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL AIR CONDITIONER]
C
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A
B
HAC
N
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1. Turn ignition switch OFF.
2. Disconnect front blower motor harness connector.
3. Turn ignition switch ON.
4. Select any front blower speed except OFF.
5. Check voltage between front blower motor harness connector
M62 terminal 2 and ground.
Is inspection result normal?
YES
>> GO TO 12.
NO
>> GO TO 4.
4.
CHECK FRONT BLOWER MOTOR RELAY
1. Turn Ignition switch OFF.
2. Check front blower motor relay. Refer to
HAC-157, "Front Blower Motor Component Inspection"
Is inspection result normal?
YES
>> GO TO 5.
NO
>> Replace front blower motor relay.
5.
CHECK FRONT BLOWER MOTOR RELAY POWER SUPPLY (SWITCH SIDE)
Check voltage between front blower motor relay harness connector
E54 terminals 7 and 5 and ground.
Is inspection result normal?
YES
>> GO TO 6.
NO
>> Repair harness or connector.
6.
CHECK FRONT BLOWER MOTOR RELAY POWER SUPPLY (COIL SIDE)
1. Turn ignition switch ON.
2. Check voltage between front blower motor relay harness con-
nector E54 terminal 1 and ground.
Is inspection result normal?
YES
>> GO TO 7.
NO
>> Repair or replace harness as necessary.
7.
CHECK FRONT BLOWER MOTOR POWER FROM RELAY TO FRONT BLOWER MOTOR
2 - Ground
: Battery voltage
WJIA1331E
A
Condition
Voltage (Ap-
prox.)
(+)
Front air control
connector
Terminal
(-)
M54
5 Ground
Blower motor
relay power
supply
Battery voltage
M54
7 Ground
Blower motor
relay power
supply
Battery voltage
WJIA1634E
A
Condition
Voltage (Ap-
prox.)
(+)
Front air control
connector
Terminal
(-)
M54
1 Ground
Blower motor
relay power
supply (coil
side)
Battery voltage
WJIA0504E
August 2012
2012 Pathfinder
HAC-156
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL AIR CONDITIONER]
BLOWER MOTOR
1. Turn ignition switch OFF.
2. Check continuity between front blower motor relay harness con-
nector E54 terminals 6 and 3 and front blower motor harness
connector M62 terminal 2.
Is inspection result normal?
YES
>> Repair open front blower motor relay ground circuit.
NO
>> Repair harness or connector between the front blower
motor relay and the front blower motor.
8.
REPLACE FUSE
.
Does fuse No. 24 or 27 open when the front blower motor is turned on?
YES or NO
YES
>> GO TO 10.
NO
>> GO TO 9.
9.
REPLACE FUSE
.
Does fuse No. 8 open when the ignition switch is turned ON?
YES or NO
YES
>> Repair or replace harness as necessary.
NO
>> Inspection End.
10.
CHECK FRONT BLOWER MOTOR POWER SUPPLY CIRCUIT FOR SHORT
1. Turn ignition switch OFF.
2. Disconnect front blower motor connector.
3. Check continuity between front blower motor harness connector
M62 terminal 2 and ground.
Is inspection result normal?
YES
>> GO TO 11.
NO
>> Repair or replace harness as necessary.
11.
CHECK FRONT BLOWER MOTOR RELAY (SWITCH SIDE) POWER SUPPLY CIRCUIT FOR SHORT
1. Disconnect front blower motor relay connector.
2. Check continuity between the front blower motor relay harness
connector E54 terminal 7 and terminal 5 and ground.
Is inspection result normal?
YES
>> Check front blower motor. Refer to
Blower Motor Diagnosis Procedure"
.
NO
>> Repair harness or connector.
12.
CHECK FRONT BLOWER MOTOR
1. Turn ignition switch OFF.
2. Check front blower motor. Refer to
HAC-157, "Front Blower Motor Component Inspection"
Is inspection result normal?
3, 6 - 2
: Continuity should exist.
WJIA1333E
2 - Ground
: Continuity should not exist.
WJIA0649E
7, 5 - Ground
: Continuity should not exist.
WJIA1334E
August 2012
2012 Pathfinder
BLOWER MOTOR
HAC-157
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL AIR CONDITIONER]
C
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HAC
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YES
>> GO TO 13.
NO
>> Replace front blower motor. Refer to
.
13.
CHECK FRONT BLOWER MOTOR RESISTOR
Check front blower motor resistor. Refer to
HAC-157, "Front Blower Motor Component Inspection"
Is inspection result normal?
YES
>> GO TO 14.
NO
>> Replace front blower motor resistor. Refer to
VTL-16, "Removal and Installation"
14.
CHECK FRONT BLOWER SWITCH
Check front blower switch. Refer to
HAC-157, "Front Blower Motor Component Inspection"
.
Is inspection result normal?
YES
>> GO TO 15.
NO
>> Replace front blower switch. Refer to
VTL-7, "Removal and Installation"
.
15.
CHECK FRONT BLOWER MOTOR GROUND CIRCUIT TO FRONT BLOWER MOTOR RESISTOR
1. Disconnect front blower motor resistor harness connector.
2. Check continuity between front blower motor connector M62 (A)
terminal 1 and front blower motor resistor harness connector
M121 (B) terminal 3.
Is inspection result normal?
YES
>> Repair harness or connector between front blower
switch connector M51 terminal 8 and ground.
NO
>> Repair harness or connector between front blower motor resistor and front blower motor.
16.
CHECK FRONT BLOWER SWITCH
Check front blower switch. Refer to
HAC-157, "Front Blower Motor Component Inspection"
.
Is inspection result normal?
YES
>> Repair harness or connector between front blower motor switch connector M51 terminal 8 and
front blower motor resistor connector M121 terminal 3.
NO
>> Replace front blower switch. Refer to
VTL-7, "Removal and Installation"
.
Front Blower Motor Component Inspection
INFOID:0000000007356437
COMPONENT INSPECTION
Front Blower Motor Relay
A
B
Connector
Terminal Connector
Terminal
Continuity
Front blower motor:
M62
1
Front blower mo-
tor resistor: M121
3
Yes
WJIA1676E
August 2012
2012 Pathfinder
HAC-158
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL AIR CONDITIONER]
BLOWER MOTOR
Check continuity between terminals by supplying 12 volts and
ground to coil side terminals of relay.
Front Blower Motor
Confirm smooth rotation of the blower motor.
• Ensure that there are no foreign particles inside the blower unit.
• Apply 12 volts to terminal 2 and ground to terminal 1 and verify that
the motor operates freely and quietly.
Front Blower Switch
Check continuity between the terminals at each front blower switch
position.
Blower Motor Resistor
LJIA0068E
WJIA1508E
WJIA0508E
August 2012
2012 Pathfinder
BLOWER MOTOR
HAC-159
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL AIR CONDITIONER]
C
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G
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K
L
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A
B
HAC
N
O
P
Check continuity between terminals. There will be resistance, but
there should not be an open or short between any two terminals.
WJIA0971E
August 2012
2012 Pathfinder
HAC-160
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL AIR CONDITIONER]
MAGNET CLUTCH
MAGNET CLUTCH
System Description
INFOID:0000000007356438
SYSTEM DESCRIPTION
The front air control controls compressor operation based on ambient and intake temperature and a signal
from ECM.
Low Temperature Protection Control
The front air control will turn the compressor ON or OFF as determined by a signal detected by the intake sen-
sor and the ambient sensor.
When intake air temperature is higher than 3.5
°
C (38.3
°
F), the compressor turns ON. The compressor turns
OFF when intake air temperature is lower than 2.5
°
C (36.5
°
F).
Magnet Clutch Component Function Check
INFOID:0000000007356439
SYMPTOM: Magnet clutch does not engage.
INSPECTION FLOW
1.
CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - MAGNET CLUTCH
1. Rotate blower control dial clockwise.
2. Rotate mode dial to vent (
) position.
3. Press A/C switch. Confirm that the compressor clutch engages (sound or visual inspection).
Is the inspection result normal?
YES
>> Inspection End.
NO
>> Go to diagnosis procedure. Refer to
HAC-160, "Magnet Clutch Diagnosis Procedure"
.
Magnet Clutch Diagnosis Procedure
INFOID:0000000007356440
Regarding Wiring Diagram information, refer to
HAC-172, "Wiring Diagram - Instruction"
.
DIAGNOSTIC PROCEDURE FOR MAGNET CLUTCH
SYMPTOM: Magnet clutch does not engage when A/C switch is ON.
1.
PERFORM AUTO ACTIVE TEST
PCS-11, "CONSULT Function (IPDM E/R)"
.
Does magnet clutch operate?
YES or NO
YES
>> •
WITH CONSULT
GO TO 2.
WJIA1490E
August 2012
2012 Pathfinder
MAGNET CLUTCH
HAC-161
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL AIR CONDITIONER]
C
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HAC
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•
WITHOUT CONSULT
GO TO 8.
NO
>> Check 10A fuse (No. 42, located in IPDM E/R), and GO TO 12.
2.
CHECK BCM INPUT (A/C COMPRESSOR ON) SIGNAL
Check A/C compressor ON/OFF signal. Refer to
BCS-23, "AIR CONDITIONER : CONSULT Function (BCM -
.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> GO TO 8.
3.
CHECK REFRIGERANT PRESSURE SENSOR
Check refrigerant pressure sensor. Refer to
(VK56DE).
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Replace refrigerant pressure sensor. Refer to
HA-54, "Removal and Installation for Refrigerant
4.
CHECK BCM INPUT (FAN ON) SIGNAL
Check FAN ON/OFF signal. Refer to
BCS-23, "AIR CONDITIONER : CONSULT Function (BCM - AIR CONDI-
.
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> GO TO 5.
5.
CHECK CIRCUIT CONTINUITY BETWEEN BCM AND FRONT AIR CONTROL
1. Turn ignition switch OFF.
2. Disconnect BCM connector and front air control connector.
3. Check continuity between BCM harness connector M18 (A) ter-
minal 28 and front air control harness connector M52 (B) termi-
nal 18.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Repair harness or connector.
6.
CHECK VOLTAGE FOR FRONT AIR CONTROL (FAN ON SIGNAL)
A/C SW ON
:AIR COND SW ON
A/C SW OFF
:AIR COND SW OFF
BLOWER CONTROL DIAL
ON
: FAN ON SIG ON
BLOWER CONTROL DIAL
OFF
: FAN ON SIG OFF
A
B
Connector
Terminal Connector
Terminal
Continuity
BCM: M18
28
Front air control:
M52
18
Yes
WJIA1627E
August 2012
2012 Pathfinder
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