Nissan Pathfinder (2011 year). Manual — part 450
REAR AIR CONTROL SYSTEM
HAC-63
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
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5.
CHECK REAR AIR CONTROL (FRONT) REAR CONTROL SELECT SWITCH SIGNAL
While pressing and holding the rear air control (front) rear control select switch, check voltage between rear air
control (front) harness connector R2 terminal 5 and ground.
Is the inspection result normal?
YES
>> GO TO 8.
NO
>> GO TO 6.
6.
CHECK REAR AIR CONTROL (FRONT) REAR CONTROL SELECT SWITCH SIGNAL
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp connector (M50).
3. Turn ignition switch ON.
4. While pressing and holding the rear air control (front) rear control select switch, check voltage between
rear air control (front) harness connector R2 terminal 5 and ground.
Is the inspection result normal?
YES
>> Replace A/C auto amp. Refer to
VTL-7, "Removal and Installation"
.
NO
>> GO TO 7.
7.
CHECK REAR AIR CONTROL (FRONT) REAR CONTROL SELECT SWITCH CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect rear air control (front) connector.
3. Check continuity between A/C auto amp. harness connector M50 terminal 39 and rear air control (front)
harness connector R2 terminal 5.
4. Check continuity between A/C auto amp. harness connector M50 terminal 39 ground.
Is the inspection result normal?
YES
>> Replace rear air control (front). Refer to
VTL-7, "Removal and Installation"
NO
>> Repair harness or connector.
8.
CHECK REAR AIR CONTROL (FRONT) REAR CONTROL SELECT SWITCH SIGNAL
While pressing and holding the rear air control (front) rear control select switch, check voltage between A/C
auto amp. harness connector M50 terminal 39 and ground.
Is the inspection result normal?
YES
>> GO TO 9.
NO
>> Repair harness or connector.
9.
CHECK REAR AIR CONTROL (FRONT) REAR CONTROL TELLTALE SIGNAL
Repeatedly press and release the rear air control (front) rear control select switch and check voltage between
A/C auto amp. harness connector M50 terminal 35 and ground.
Connector
Terminals
Voltage (Ap-
prox.)
(+)
(-)
Rear air control (front): R2
5
Ground
6.5V
Connector
Terminals
Voltage (Ap-
prox.)
(+)
(-)
Rear air control (front): R2
5
Ground
6.5V
Continuity should exist.
Continuity should not exist.
Connector
Terminals
Voltage (Ap-
prox.)
(+)
(-)
A/C auto amp.: M50
39
Ground
6.5V
2011 Pathfinder
HAC-64
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
REAR AIR CONTROL SYSTEM
Is the inspection result normal?
YES
>> Repair harness or connector.
NO
>> GO TO 10.
10.
CHECK REAR AIR CONTROL (FRONT) REAR CONTROL TELLTALE CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp connector M50 and rear air control (front) connector R2.
3. Check continuity between A/C auto amp. harness connector M50 terminal 35 and rear air control (front)
harness connector R2 terminal 4.
4. Check continuity between A/C auto amp. harness connector M50 terminal 35 and ground.
Is the inspection result normal?
YES
>> GO TO 11.
NO
>> Repair harness or connector.
11.
CHECK REAR AIR CONTROL (FRONT) REAR CONTROL TELLTALE CIRCUIT
1. Reconnect rear air control (front) connector.
2. Check continuity between rear air control (front) connector R2 terminal 4 and ground.
Is the inspection result normal?
YES
>> Replace A/C auto amp. Refer to
VTL-7, "Removal and Installation"
NO
>> Replace rear air control (front). Refer to
VTL-7, "Removal and Installation"
12.
CHECK REAR AIR CONTROL (REAR) GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between rear air control (rear) harness connector M208 terminal 1 and ground.
Is the inspection result normal?
YES
>> GO TO 13.
NO
>> Repair harness or connector.
13.
CHECK REAR AIR CONTROL (REAR) REFERENCE VOLTAGE
1. Turn ignition switch ON.
2. Check voltage between rear air control (rear) harness connector M208 terminal 3 and ground.
Is the inspection result normal?
YES
>> GO TO 15.
NO
>> GO TO 14.
14.
CHECK REAR AIR CONTROL (REAR) REFERENCE VOLTAGE CIRCUIT
Connector
Terminals
Voltage (Ap-
prox.)
(+)
(-)
A/C auto amp.: M50
35
Ground
Switching be-
tween battery
voltage and
7.5V
Continuity should exist.
Continuity should not exist.
Continuity should not exist.
Continuity should exist.
Connector
Terminals
Voltage (Ap-
prox.)
(+)
(-)
Rear air control (rear): M208
3
Ground
4.5V
2011 Pathfinder
REAR AIR CONTROL SYSTEM
HAC-65
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
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1. Disconnect A/C auto amp. connector.
2. Check continuity between A/C auto amp. harness connector M50 terminal 28 and rear air control (rear)
harness connector M208 terminal 3.
Is the inspection result normal?
YES
>> Replace A/C auto amp. Refer to
VTL-7, "Removal and Installation"
.
NO
>> Repair harness or connector.
15.
CHECK REAR AIR CONTROL (REAR) REFERENCE GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between rear air control (rear) harness connector M208 terminal 8 and ground.
Is the inspection result normal?
YES
>> GO TO 17
NO
>> GO TO 18.
16.
CHECK REAR AIR CONTROL (REAR) REFERENCE GROUND CIRCUIT FOR OPEN
1. Disconnect A/C auto amp. connector and rear air control (rear) harness connector.
2. Check continuity between A/C auto amp. harness connector M49 terminal 3 and rear air control (rear) har-
ness connector M208 terminal 8.
Is the inspection result normal?
YES
>> Replace A/C auto amp. Refer to
VTL-7, "Removal and Installation"
.
NO
>> Repair harness or connector.
17.
CHECK REAR AIR CONTROL (REAR) AUX TEMP POT VOLTAGE
1. Turn ignition ON.
2. Check voltage between rear air control (rear) harness connector M208 terminal 7 and ground while turn-
ing knob between full cold and full hot.
Is the inspection result normal?
YES
>> GO TO 19.
NO
>> GO TO 18.
18.
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.
4. Check continuity between A/C auto amp. harness connector M50 terminal 51 and ground.
Is the inspection result normal?
YES
>> Replace rear air control (rear) switch. Refer to
VTL-7, "Removal and Installation"
.
NO
>> Repair harness or connector.
Continuity should exist.
Continuity should exist.
Continuity should exist.
Connector
Terminals
Voltage (Ap-
prox.)
(+)
(-)
Rear air control (rear): M208
7
Ground
Varying be-
tween 0.1V and
4.9V
Continuity should exist.
Continuity should not exist.
2011 Pathfinder
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
2011 Pathfinder
REAR AIR CONTROL SYSTEM
HAC-67
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
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HAC
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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
2011 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-29, "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
2011 Pathfinder
MAGNET CLUTCH
HAC-69
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
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MAGNET CLUTCH
System Description
INFOID:0000000006243658
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:0000000006243659
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:0000000006243660
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)
2011 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-III
GO TO 5.
•
WITHOUT CONSULT-III
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.
2011 Pathfinder
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