Nissan Frontier. Instruction — part 872
HAC-42
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
BLOWER MOTOR CONTROL SYSTEM
Check continuity between terminals 3 and 5 and terminals 7 and 6
by supplying 12 volts and ground to coil side terminals 1 and 2 of the
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.
LJIA0068E
MAGNET CLUTCH
HAC-43
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
MAGNET CLUTCH
System Description
INFOID:0000000009478289
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 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:0000000009478290
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 mode switch (
).
4. Confirm that the compressor clutch engages (sound or visual inspection). (Discharge 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-43, "Magnet Clutch Diagnosis Procedure"
.
Magnet Clutch Diagnosis Procedure
INFOID:0000000009478291
Regarding Wiring Diagram information, refer to
HAC-63, "Wiring Diagram - Automatic Air Conditioner"
DIAGNOSTIC PROCEDURE FOR MAGNET CLUTCH
Ambient temperature
°C (°F)
Compressor ON intake temperature
°C
(
°F)
Compressor OFF intake temperature
°C (°F)
0 (32)
5.5 (42)
5.0 (41)
10 (50)
5.5 (42)
5.0 (41)
20 (68)
5.5 (42)
5.0 (41)
30 (86)
4.0 (39)
3.5 (38)
40 (104)
3.5 (38)
3.0 (37)
50 (122)
3.5 (38)
3.0 (37)
HAC-44
< 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-20, "Front Air Control Self-Diagnosis"
.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> • Malfunctioning intake sensor. Refer to
HAC-56, "Intake Sensor Diagnosis Procedure"
.
• Malfunctioning ambient sensor. Refer to
HAC-48, "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.
ALIIA0761GB
11 – 1
: Continuity should exist.
11 – ground
: Continuity should not exist.
WJIA0560E
MAGNET CLUTCH
HAC-45
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
NO
>> Repair harness or connector.
4.
CHECK MAGNET CLUTCH CIRCUIT
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
HAC-19, "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 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 27 and front air control harness connector M52 (B) termi-
nal 4.
4. Check continuity between BCM harness connector M18 (A) ter-
minal 27 and ground.
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> Repair harness or connector.
7.
CHECK VOLTAGE FOR FRONT AIR CONTROL (A/C COMPRESSOR ON SIGNAL)
1. Reconnect BCM connector and front air control connector.
2. Turn ignition switch ON.
3. Check voltage between front air control harness connector M52
terminal 4 and ground.
Is the inspection result normal?
YES
>> GO TO 8.
SJIA0197E
A/C SWITCH ON
:AIR COND SW ON
A/C SWITCH OFF
:AIR COND SW OFF
27 - 4
Continuity should exist.
27 - ground
Continuity should not exist.
AWIIA0416ZZ
Terminals
Condition
Voltage
(+)
(-)
Front air con-
trol connec-
tor
Terminal No.
M52
4
Ground
A/C switch: ON
Approx. 0V
A/C switch: OFF
Approx. 5V
AWIIA0417ZZ
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