Nissan Pathfinder (2012 year). Instruction — part 418
HAC-66
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
REAR AIR CONTROL SYSTEM
19.
CHECK REAR AIR CONTROL (REAR) AUX TEMP POT VOLTAGE
Check voltage between A/C auto amp. harness connector M50 terminal 51 and ground while turning knob
between full cold and full hot.
Is the inspection result normal?
YES
>> GO TO 21.
NO
>> GO TO 20.
20.
CHECK REAR AIR CONTROL (REAR) AUX TEMP POT CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. connector and rear air control (rear) connector.
3. Check continuity between A/C auto amp. harness connector M50 terminal 51 and rear air control (rear)
harness connector M208 terminal 7.
Is the inspection result normal?
YES
>> Replace A/C auto amp. Refer to
VTL-7, "Removal and Installation"
NO
>> Repair harness or connector.
21.
CHECK AIR MIX DOOR MOTOR (REAR) CIRCUITS FOR OPEN AND SHORT TO GROUND
1. Turn ignition switch OFF.
2. Disconnect the A/C auto amp. harness connector M50 and the air mix door motor (rear) harness connec-
tor B155.
3. Check continuity between A/C auto amp. harness connector M50 terminals 43, 44 and the air mix door
motor (rear) harness connector B155 terminal 1, 6.
4. Check continuity between A/C auto amp. harness connector M50 terminals 43, 44 and ground.
Is the inspection result normal?
YES
>> GO TO 22.
NO
>> Repair or replace harness as necessary.
22.
CHECK A/C AUTO AMP. FOR AIR MIX DOOR MOTOR (REAR) POWER AND GROUND
1. Reconnect A/C auto amp. harness connector.
2. Turn ignition switch ON.
3. Rotate temperature control dial (rear) to maximum hot.
4. Check voltage between A/C auto amp. harness connector M50 terminal 43 and terminal 44 while rotating
temperature control dial (rear) to maximum cold and back to maximum heat.
Connector
Terminals
Voltage (Ap-
prox.)
(+)
(-)
A/C auto amp.: M50
51
Ground
Varying be-
tween 0.1V and
4.9V
Continuity should exist.
Connector
Terminal
Connector
Terminal
Continuity
M50
43
B155
1
Yes
44
6
Connector
Terminal
—
Continuity
M50
43
Ground
No
44
August 2012
2012 Pathfinder
REAR AIR CONTROL SYSTEM
HAC-67
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
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Is the inspection result normal?
YES
>> GO TO 23.
NO
>> Replace A/C auto amp. Refer to
VTL-7, "Removal and Installation"
.
23.
CHECK AIR MIX DOOR MOTOR (REAR) PBR CIRCUITS FOR OPEN AND SHORT TO GROUND
1. Turn ignition switch OFF.
2. Disconnect the A/C auto amp. harness connectors M49 and M50.
3. Check continuity between A/C auto amp. harness connector M49 terminal 3 and M50 terminal 28 and air
mix door motor (rear) harness connector B155 terminal 2, 3.
4. Check continuity between A/C auto amp. harness connector M49 terminal 3, M50 terminal 28 and ground.
Is the inspection result normal?
YES
>> GO TO 24.
NO
>> Repair or replace harness as necessary.
24.
CHECK PBR FEEDBACK SIGNAL CIRCUIT FOR OPEN AND SHORT TO GROUND
1. Check continuity between A/C auto amp. harness connector M50 terminal 30 and air mix door motor
(rear) harness connector B155 terminal 4.
2. Check continuity between A/C auto amp. harness connector M50 terminal 30 and ground.
Is the inspection result normal?
YES
>> GO TO 25.
NO
>> Repair or replace harness as necessary.
25.
CHECK A/C AUTO AMP. FOR 5 VOLT REFERENCE (VREF), VREF RETURN, AND FEEDBACK SIG-
NAL
1. Reconnect A/C auto amp. harness connectors.
2. Turn ignition switch ON.
3. Check voltage between A/C auto amp. harness connector M49 terminal 3, and M50 terminal 28.
Connector
Terminals
Condition Voltage
(Approx.)
(+) (-)
M50
43
44
Rotate rear temperature control dial
(rear) to maximum cold
Battery voltage
44
43
Rotate rear temperature control dial
(rear) to maximum heat
Battery voltage
Connector
Terminal
Connector
Terminal
Continuity
M49
3
B155
2
Yes
M50
28
3
Connector
Terminal
—
Continuity
M49
3
Ground
No
M50
28
Connector
Terminal
Connector
Terminal
Continuity
M50
30
B155
4
Yes
Connector
Terminal
—
Continuity
M50
30
Ground
No
August 2012
2012 Pathfinder
HAC-68
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
REAR AIR CONTROL SYSTEM
4. Check voltage between A/C auto amp. harness connector M50 terminal 30 and ground.
Is the inspection result normal?
YES
>> GO TO 26.
NO
>> Replace A/C auto amp. Refer to
VTL-7, "Removal and Installation"
26.
CHECK A/C AUTO AMP. FOR FEEDBACK SIGNAL
1. Reconnect the air mix door motor (rear) harness connector B155.
2. Check voltage between A/C auto amp. harness connector M50 terminal 30 and ground.
Is the inspection result normal?
YES
>> Inspect air mix door (rear) for binding or mechanical failure. If air mix door (rear) moves freely,
replace A/C auto amp. Refer to
VTL-7, "Removal and Installation"
.
NO
>> Replace the air mix door motor (rear). Refer to
VTL-30, "Removal and Installation"
Connector
Terminals
Connector
Terminals
Voltage (Approx.)
(+)
(-)
M50
28
M49
3
5V
Connector
Terminal
—
Voltage (Approx.)
M50
30
Ground
0V
Connector
Terminal
—
Voltage (Approx.)
M50
30
Ground
0.1 to 4.9V
August 2012
2012 Pathfinder
MAGNET CLUTCH
HAC-69
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
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MAGNET CLUTCH
System Description
INFOID:0000000007356377
SYSTEM DESCRIPTION
The A/C auto amp. controls compressor operation based on ambient and intake temperature and a signal
from ECM.
Low Temperature Protection Control
The A/C auto amp. 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 the preset value, the compressor turns ON. The compressor turns
OFF when intake air temperature is lower than the preset value. That preset value is dependent on the ambi-
ent temperature, refer to the following table.
Magnet Clutch Component Function Check
INFOID:0000000007356378
INSPECTION FLOW
1.
CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - MAGNET CLUTCH
1. Turn ignition switch ON.
2. Press the A/C switch.
3. Press vent switch (
).
4. Display shows
, A/C. Confirm that the compressor clutch engages (sound or visual inspection). (Dis-
charge air and blower speed will depend on ambient, in-vehicle and set temperatures.)
Is the inspection result normal?
YES
>> Inspection End.
NO
>> Go to diagnosis procedure. Refer to
HAC-69, "Magnet Clutch Diagnosis Procedure"
.
Magnet Clutch Diagnosis Procedure
INFOID:0000000007356379
Regarding Wiring Diagram information, refer to
HAC-95, "Wiring Diagram - Automatic"
DIAGNOSTIC PROCEDURE FOR MAGNET CLUTCH
Ambient temperature
°
C
(
°
F)
VK56DE Model
VQ40DE Model
Compressor ON
intake temperature
°
C
(
°
F)
Compressor OFF
intake temperature
°
C
(
°
F)
Compressor ON
intake temperature
°
C
(
°
F)
Compressor OFF
intake temperature
°
C
(
°
F)
0 (32)
6.0 (43)
5.5 (42)
5.5 (42)
5.0 (41)
10 (50)
5.0 (41)
5.0 (41)
4.5 (40)
4.5 (40)
20 (68)
3.5 (38)
3.0 (37)
3.0 (37)
2.5 (37)
30 (86)
3.0 (37)
2.5 (37)
2.5 (37)
1.5 (35)
40 (104)
3.0 (37)
2.5 (37)
2.0 (36)
1.0 (34)
50 (122)
3.0 (37)
2.5 (37)
2.0 (36)
1.0 (34)
August 2012
2012 Pathfinder
HAC-70
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
MAGNET CLUTCH
SYMPTOM: Magnet clutch does not engage when A/C switch is ON.
1.
CHECK INTAKE AND AMBIENT SENSOR CIRCUITS
Check intake and ambient sensors. Refer to
HAC-24, "A/C Auto Amp. Self-Diagnosis"
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> • Malfunctioning intake sensor. Refer to
HAC-87, "Intake Sensor Diagnosis Procedure"
.
• Malfunctioning ambient sensor. Refer to
HAC-79, "Ambient Sensor Diagnosis Procedure"
2.
PERFORM AUTO ACTIVE TEST
PCS-9, "Diagnosis Description"
.
Does magnet clutch operate?
YES
>> •
WITH CONSULT
GO TO 5.
•
WITHOUT CONSULT
GO TO 6.
NO
>> Check 10A fuse (No. 42, located in IPDM E/R), and GO TO 3.
3.
CHECK CIRCUIT CONTINUITY BETWEEN IPDM E/R AND COMPRESSOR
1. Turn ignition switch OFF.
2. Disconnect IPDM E/R connector and compressor (magnet clutch) connector.
3. Check continuity between IPDM E/R harness connector E119 terminal 11 and A/C compressor harness
connector F3 terminal 1.
4. Check continuity between IPDM E/R harness connector E119 terminal 11 and ground.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair harness or connector.
4.
CHECK MAGNET CLUTCH CIRCUIT
AWIIA0198GB
11 – 1
: Continuity should exist.
11 – 1
: Continuity should not exist.
August 2012
2012 Pathfinder
MAGNET CLUTCH
HAC-71
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
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Check for operation sound when applying battery voltage direct cur-
rent to terminal.
Is the inspection result normal?
YES
>> Replace IPDM E/R. Refer to
.
NO
>> Replace magnet clutch. Refer to
Installation for Compressor Clutch"
5.
CHECK BCM INPUT (COMPRESSOR ON) SIGNAL
Check compressor ON/OFF signal. Refer to
BCS-23, "AIR CONDITIONER : CONSULT Function (BCM - AIR
Is the inspection result normal?
YES
>> GO TO 8.
NO
>> GO TO 6.
6.
CHECK CIRCUIT CONTINUITY BETWEEN BCM AND A/C AUTO AMP.
1. Turn ignition switch OFF.
2. Disconnect BCM connector and A/C auto amp. connector.
3. Check continuity between BCM harness connector M18 terminal 27 and A/C auto amp. harness connec-
tor M49 terminal 4.
4. Check continuity between BCM harness connector M18 terminal 27 and ground.
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> Repair harness or connector.
7.
CHECK VOLTAGE FOR A/C AUTO AMP. (A/C COMPRESSOR ON SIGNAL)
1. Reconnect BCM connector and A/C auto amp. connector.
2. Turn ignition switch ON.
3. Check voltage between A/C auto amp. harness connector M49
terminal 4 and ground.
Is the inspection result normal?
YES
>> GO TO 8.
NO-1 >> If the voltage is approx. 5V when A/C switch is ON, replace A/C auto amp. Refer to
.
NO-2 >> If the voltage is approx. 0V when A/C switch is OFF, replace BCM. Refer to
.
SJIA0197E
A/C SW ON
: AIR COND SW ON
A/C SW OFF
: AIR COND SW OFF
27 - 4
Continuity should exist.
27 - ground Continuity should not exist.
Terminals
Condition
Voltage
(+)
(-)
A/C auto
amp. con-
nector
Terminal No.
M49
4
Ground
A/C switch: ON
Approx. 0V
A/C switch: OFF
Approx. 5V
AWIIA0200ZZ
August 2012
2012 Pathfinder
HAC-72
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
MAGNET CLUTCH
8.
CHECK REFRIGERANT PRESSURE SENSOR
1. Start engine.
2. Check voltage between ECM harness connector F54 (VQ40DE)
or F79 (VK56DE) terminal 70 and ground.
Is the inspection result normal?
YES
>> GO TO 9.
NO
>> Refer to
9.
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 12.
NO
>> GO TO 10.
10.
CHECK CIRCUIT CONTINUITY BETWEEN BCM AND A/C AUTO AMP.
1. Turn ignition switch OFF.
2. Disconnect BCM connector and A/C auto amp. connector.
3. Check continuity between BCM harness connector M18 terminal 28 and A/C auto amp. harness connec-
tor M49 terminal 5.
4. Check continuity between BCM harness connector M18 terminal 28 and ground.
Is the inspection result normal?
YES
>> GO TO 11.
NO
>> Repair harness or connector.
11.
CHECK VOLTAGE FOR A/C AUTO AMP. (FAN ON SIGNAL)
1. Reconnect BCM connector and A/C auto amp. connector.
2. Turn ignition switch ON.
3. Check voltage between A/C auto amp. harness connector M49
terminal 5 and ground.
Terminals
Condition
Voltage
(+)
(-)
ECM connector
Terminal
No.
F54 (VQ40DE)
F79 (VK56DE)
70
Ground
A/C switch: ON
Approx. 0.36 - 3.88V
LJIA0124E
FRONT BLOWER CONTROL
DIAL ON
: FAN ON SIG ON
FRONT BLOWER CONTROL
DIAL OFF
: FAN ON SIG OFF
28 - 5
Continuity should exist.
28 - ground Continuity should not exist.
AWIIA0202ZZ
August 2012
2012 Pathfinder
MAGNET CLUTCH
HAC-73
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
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Is the inspection result normal?
YES
>> GO TO 12.
NO-1 >> If the voltage is approx. 5V when blower motor is ON, replace A/C auto amp. Refer to
.
NO-2 >> If the voltage is approx. 0V when blower motor is OFF, replace BCM. Refer to
.
12.
CHECK CAN COMMUNICATION
Check CAN communication. Refer to
LAN-14, "Trouble Diagnosis Flow Chart"
.
• BCM – ECM
• ECM – IPDM E/R
• ECM – A/C auto amp.
Is the inspection result normal?
YES
>> Replace IPDM E/R. Refer to
PCS-29, "Removal and Installation of IPDM E/R"
.
NO
>> Repair or replace malfunctioning part(s).
Terminals
Condition
Voltage
(+)
(-)
A/C auto amp.
connector
Terminal No.
M49
5
Ground
A/C switch: ON
Blower motor
operates
Approx. 0V
A/C switch: OFF
Approx. 5V
August 2012
2012 Pathfinder
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