Nissan Frontier D40. Instruction — part 733
BLOWER MOTOR
HAC-35
< COMPONENT DIAGNOSIS >
[MANUAL A/C (TYPE 1)]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
8.
CHECK FRONT BLOWER MOTOR RELAY (COIL SIDE) POWER SUPPLY
1.
Turn ignition switch ON.
2.
Check voltage between front blower motor relay harness con-
nector terminal 1 and ground.
• E54 (King Cab)
• E55 (Crew Cab)
Is the inspection result normal?
YES
>> Replace variable blower control. Refer to
.
NO
>> Repair front blower motor ground circuit or connector.
9.
REPLACE FUSES
Replace fuses.
Does the fuse blow?
YES
>> • If fuse blows without activating the front blower motor, repair short between fuse and front
blower motor relay.
• If fuse blows activating the front blower motor, GO TO 10.
NO
>> Inspection End.
10.
CHECK FRONT BLOWER MOTOR POWER SUPPLY CIRCUIT FOR SHORT
1.
Turn ignition switch OFF.
2.
Disconnect front blower motor connector and variable blower
control connector.
3.
Check continuity between variable blower control harness con-
nector M121 terminal 4 and ground.
Is the inspection result normal?
YES
>> GO TO 11.
NO
>> Repair harness or connector.
11.
CHECK FRONT BLOWER MOTOR
Check front blower motor. Refer to
HAC-32, "Front Blower Motor Component Function Check"
Is the inspection result normal?
YES
>> Replace variable blower control. Refer to
VTL-10, "Removal and Installation"
.
NO
>> Replace front blower motor. Refer to
VTL-9, "Removal and Installation"
.
12.
CHECK FRONT BLOWER MOTOR
Check front blower motor. Refer to
HAC-32, "Front Blower Motor Component Function Check"
Is the inspection result normal?
YES
>> GO TO 13.
NO
>> Replace front blower motor. Refer to
VTL-9, "Removal and Installation"
.
13.
CHECK BLOWER MOTOR GROUND CIRCUIT
1 - Ground
: Battery voltage
WJIA1991E
4 - Ground
: Continuity should not exist.
AWIIA0177ZZ
HAC-36
< COMPONENT DIAGNOSIS >
[MANUAL A/C (TYPE 1)]
BLOWER MOTOR
1.
Disconnect variable blower control harness connector.
2.
Check continuity between front blower motor harness connector
M62 (B) terminal 1 and variable blower control harness connec-
tor M121 (A) terminal 2.
Is the inspection result normal?
YES
>> GO TO 14.
NO
>> Repair harness or connector.
14.
CHECK VARIABLE BLOWER CONTROL POWER SUPPLY CIRCUIT FOR OPEN
Check continuity between front blower motor relay harness connec-
tor (A) terminals 3, 6 and variable blower control harness connector
M121 (B) terminal 4.
• E54 (King Cab)
• E55 (Crew Cab)
Is the inspection result normal?
YES
>> GO TO 15.
NO
>> Repair harness or connector.
15.
CHECK VARIABLE BLOWER CONTROL GROUND CIRCUIT
Check continuity between variable blower control harness connector
M121 terminal 1 and ground.
Is the inspection result normal?
YES
>> GO TO 16.
NO
>> Repair harness or connector.
16.
CHECK VARIABLE BLOWER CONTROL SIGNAL CIRCUIT
1.
Reconnect all disconnected component connectors.
2.
Disconnect front air control connector.
3.
Turn ignition switch ON.
4.
Turn blower control dial to maximum speed.
5.
check voltage between front air control harness connector M50
terminal 24 and ground.
Is the inspection result normal?
YES
>> Replace front air control. Refer to
NO
>> GO TO 17.
17.
CHECK VARIABLE BLOWER CONTROL SIGNAL CIRCUIT
1 - 2
: Continuity should exist.
AWIIA0179ZZ
3, 6 - 4
: Continuity should exist.
AWIIA1212ZZ
1 - Ground
: Continuity should exist.
AWIIA0180ZZ
24 - Ground
Approx.: 4.5V
AWIIA1226ZZ
BLOWER MOTOR
HAC-37
< COMPONENT DIAGNOSIS >
[MANUAL A/C (TYPE 1)]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
1.
Turn ignition switch OFF.
2.
Disconnect variable blower control.
3.
Check continuity between front air control harness connector
M50 (B) terminal 24 and variable blower control harness con-
nector M121 (A) terminal 3.
Is the inspection result normal?
YES
>> Replace variable blower control. Refer to
.
NO
>> Repair harness or connector.
Front Blower Motor Component Inspection
INFOID:0000000005275887
COMPONENT INSPECTION
Front Blower Motor Relay
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.
24 - 3
: Continuity should exist.
AWIIA1213ZZ
LJIA0068E
WJIA1508E
HAC-38
< COMPONENT DIAGNOSIS >
[MANUAL A/C (TYPE 1)]
MAGNET CLUTCH
MAGNET CLUTCH
System Description
INFOID:0000000005275888
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:0000000005275889
SYMPTOM: Magnet clutch does not engage.
INSPECTION FLOW
1.
CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - MAGNET CLUTCH
1.
Rotate blower control dial clockwise.
2.
Press the vent (
) mode switch.
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-38, "Magnet Clutch Diagnosis Procedure"
.
Magnet Clutch Diagnosis Procedure
INFOID:0000000005275890
Regarding Wiring Diagram information, refer to
HAC-50, "Wiring Diagram - Air Conditioner Control - With
.
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
Perform IPDM E/R auto active test. Refer to
PCS-15, "CONSULT - III Function (IPDM E/R)"
.
Does magnet clutch operate?
YES
>> •
WITH CONSULT-III
GO TO 2.
AWIIA1216GB
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