Nissan Frontier D40. Instruction — part 732
INTAKE DOOR MOTOR
HAC-31
< COMPONENT DIAGNOSIS >
[MANUAL A/C (TYPE 1)]
C
D
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F
G
H
J
K
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M
A
B
HAC
N
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P
1.
Press any button on the front air control to back out of self-diag-
nostic mode.
2.
Check voltage between front air control harness connector M50
terminal 21 and terminal 22 while placing the front air control
into self-diagnostic mode. Refer to
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Replace front air control. Refer to
VTL-7, "Removal and Installation"
.
4.
CHECK INTAKE DOOR MOTOR AND CIRCUITS FOR OPEN
1.
Turn ignition switch OFF.
2.
Disconnect the front air control harness connector.
3.
Check continuity between front air control harness connector
M50 terminal 21 and terminal 22.
Is the inspection result normal?
YES
>> Replace intake door motor. Refer to
.
NO
>> GO TO 5.
5.
CHECK INTAKE DOOR MOTOR CIRCUITS FOR OPEN
1.
Disconnect the intake door motor harness connector.
2.
Check continuity between front air control harness connector
M50 (A) terminals 21, 22 and the intake door motor harness
connector M58 (B) terminals 1, 6.
Is the inspection result normal?
YES
>> Replace intake door motor. Refer to
.
NO
>> Repair or replace harness as necessary.
Connector
Terminals
Condition
Voltage
(Approx.)
(+) (-)
Front air control:
M50
22 21
Self-diagnostic
mode
Battery
voltage
AWIIA0399ZZ
Continuity should exist.
AWIIA0400ZZ
21 - 6
: Continuity should exist.
22 - 1
: Continuity should exist.
AWIIA0401ZZ
HAC-32
< COMPONENT DIAGNOSIS >
[MANUAL A/C (TYPE 1)]
BLOWER MOTOR
BLOWER MOTOR
System Description
INFOID:0000000005275884
Component Parts
Blower speed control system components are:
• Front air control
• Variable blower control
• Front blower motor
• Front blower motor relay
System Operation
COMPONENT DESCRIPTION
Variable Blower Control
The variable blower control (1) is located on the heater and cooling
unit assembly. The variable blower control receives a gate voltage
from the front air control to steplessly maintain the blower motor volt-
age in the 0 to 5 volt range (approx.)
⇒↓
:front.
Front Blower Motor Component Function Check
INFOID:0000000005275885
INSPECTION FLOW
1.
CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - FRONT BLOWER
1.
Rotate the blower control dial clockwise. Blower should operate.
2.
Rotate the blower control dial clockwise, and continue checking blower speed until all speeds are
checked.
Is the inspection result normal?
YES
>> Inspection End.
NO
>> Go to diagnosis procedure. Refer to
HAC-33, "Front Blower Motor Diagnosis Procedure"
AWIIA1209ZZ
AWIIA1225ZZ
BLOWER MOTOR
HAC-33
< COMPONENT DIAGNOSIS >
[MANUAL A/C (TYPE 1)]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
Front Blower Motor Diagnosis Procedure
INFOID:0000000005275886
Regarding Wiring Diagram information, refer to
HAC-50, "Wiring Diagram - Air Conditioner Control - With
SYMPTOM: Blower motor operation is malfunctioning.
DIAGNOSTIC PROCEDURE FOR BLOWER MOTOR
SYMPTOM: Blower motor operation is malfunctioning under starting
blower speed control.
1.
CHECK FUSES
Check 15A fuses [No. 24 and 27 (Located in the fuse and fusible link box)]. For fuse layout. Refer to
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> GO TO 9.
2.
CHECK FRONT BLOWER MOTOR POWER SUPPLY CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect front blower motor connector.
3.
Turn ignition switch ON.
4.
Press the A/C switch.
5.
Rotate blower control dial to maximum speed.
6.
Check voltage between front blower motor harness connector
M62 terminal 2 and ground.
Is the inspection result normal?
YES
>> GO TO 12.
NO
>> GO TO 3.
3.
CHECK FRONT BLOWER MOTOR RELAY (SWITCH SIDE) POWER SUPPLY CIRCUIT
AWIIA1211GB
Fuses are good.
2 - Ground
: Battery voltage
WJIA1331E
HAC-34
< COMPONENT DIAGNOSIS >
[MANUAL A/C (TYPE 1)]
BLOWER MOTOR
1.
Turn ignition switch OFF.
2.
Disconnect front blower motor relay.
3.
Check voltage between front blower motor relay harness con-
nector terminals 5,7 and ground.
• E54 (King Cab)
• E55 (Crew Cab)
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair harness or connector.
4.
CHECK FRONT BLOWER MOTOR RELAY
Turn ignition switch OFF.
Check front blower motor relay. Refer to
HAC-37, "Front Blower Motor Component Inspection"
.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Replace front blower motor relay.
5.
CHECK FRONT BLOWER MOTOR RELAY (SWITCH SIDE) CIRCUIT FOR OPEN
Check continuity between front blower motor relay harness connec-
tor terminals 3, 6 and front blower motor harness connector M62 ter-
minal 2.
• E54 (King Cab)
• E55 (Crew Cab)
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Repair harness or connector.
6.
CHECK VARIABLE BLOWER CONTROL POWER SUPPLY CIRCUIT FOR OPEN
1.
Disconnect variable blower control harness connector.
2.
Check continuity between front blower motor relay harness con-
nector (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 7.
NO
>> Repair harness or connector.
7.
CHECK FRONT BLOWER MOTOR RELAY (COIL SIDE) GROUND CIRCUIT
Check continuity between front blower motor relay harness connec-
tor terminal 2 and ground.
• E54 (King Cab)
• E55 (Crew Cab)
Is the inspection result normal?
YES
>> GO TO 8.
NO
>> Repair harness or connector.
5, 7 - Ground
: Battery voltage
WJIA1634E
3, 6 - 2
: Continuity should exist.
WJIA1333E
3, 6 - 4
: Continuity should exist.
AWIIA1212ZZ
2 - Ground
: Continuity should exist
AWIIA1227ZZ
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