Nissan Frontier. Manual — part 908
HAC-186
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 2)]
BLOWER MOTOR
Is inspection result normal?
YES
>> GO TO 13.
NO
>> Replace front blower motor. Refer to
VTL-11, "Removal and Installation"
13.
CHECK FRONT BLOWER MOTOR RESISTOR
Check front blower motor resistor. Refer to
HAC-186, "Front Blower Motor Component Inspection"
Is inspection result normal?
YES
>> GO TO 14.
NO
>> Replace front blower motor resistor. Refer to
VTL-13, "Removal and Installation"
14.
CHECK FRONT BLOWER SWITCH
Check front blower switch. Refer to
HAC-186, "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
M122 (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-186, "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 M122 terminal 3.
NO
>> Replace front blower switch. Refer to
VTL-7, "Removal and Installation"
SYMPTOM: Blower motor operation is malfunctioning.
Front Blower Motor Component Inspection
INFOID:0000000009478397
COMPONENT INSPECTION
Front Blower Motor Relay
A
B
Connector
Terminal Connector
Terminal
Continuity
Front blower motor:
M62
1
Front blower mo-
tor resistor: M122
3
Yes
WJIA1676E
BLOWER MOTOR
HAC-187
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 2)]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
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 terminals at each front blower speed position.
Front Blower Motor Resistor
Check continuity between terminals. There will be resistance, but
there should not be an open or short between any two terminals.
LJIA0068E
WJIA0971E
HAC-188
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 2)]
MAGNET CLUTCH
MAGNET CLUTCH
System Description
INFOID:0000000009478398
SYSTEM DESCRIPTION
The front air control controls compressor operation based on 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.
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:0000000009478399
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-188, "Magnet Clutch Diagnosis Procedure"
.
Magnet Clutch Diagnosis Procedure
INFOID:0000000009478400
Regarding Wiring Diagram information, refer to
HAC-200, "Wiring Diagram - With Type 2"
DIAGNOSTIC PROCEDURE FOR MAGNET CLUTCH
SYMPTOM: Magnet clutch does not engage when A/C switch is ON.
1.
PERFORM IPDM E/R AUTO ACTIVE TEST
PCS-11, "CONSULT Function (IPDM E/R)"
.
Does magnet clutch operate?
YES
>> •
WITH CONSULT
GO TO 2.
•
WITHOUT CONSULT
AWIIA1787GB
MAGNET CLUTCH
HAC-189
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 2)]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
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-20, "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
(QR25DE) or
(VQ40DE).
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Replace refrigerant pressure sensor. Refer to
HA-36, "Removal and Installation"
4.
CHECK BCM INPUT (FAN ON) SIGNAL
Check FAN ON/OFF signal. Refer to
BCS-20, "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 M49 (B) termi-
nal 18.
4. Check continuity between BCM harness connector M18 (A) ter-
minal 28 and ground.
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:
M49
18
Yes
Connector
Terminal
Ground
Continuity
BCM: M18
28
No
WJIA1627E
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