Nissan Pathfinder. Manual — part 717
DOOR MOTOR COMMUNICATION CIRCUIT
HAC-129
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONING]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
Is the inspection result normal?
YES
>> Replace A/C auto amp. Refer to
HAC-157, "Removal and Installation"
.
NO
>> Repair harness or connector.
HAC-130
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONING]
FRONT BLOWER MOTOR
FRONT BLOWER MOTOR
Diagnosis Procedure
INFOID:0000000009176867
Regarding Wiring Diagram information, refer to
1.
CHECK FUSE
1. Turn ignition switch OFF.
2. Check 15A fuses [Nos. 17 and 27, located in fuse block (J/B)].
NOTE:
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Replace the blown fuse after repairing the affected circuit.
2.
CHECK FRONT BLOWER MOTOR POWER SUPPLY
1. Disconnect front blower motor connector.
2. Turn ignition switch ON.
3. Check voltage between front blower motor harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> GO TO 6.
3.
CHECK FRONT BLOWER MOTOR GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between front blower motor harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair harness or connector.
4.
CHECK FRONT BLOWER MOTOR CONTROL SIGNAL CIRCUIT
1. Disconnect A/C auto amp. connector.
2. Check continuity between front blower motor harness connector and A/C auto amp. harness connector.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair the harness or connector.
5.
CHECK FRONT BLOWER MOTOR CONTROL SIGNAL
+
−
Voltage
Front blower motor
Connector
Terminal
M112
4
Ground
Battery voltage
Front blower motor
—
Continuity
Connector
Terminal
M112
1
Ground
Yes
Front blower motor
A/C auto amp.
Continuity
Connector
Terminal
Connector
Terminal
M112
3
M50
18
Yes
FRONT BLOWER MOTOR
HAC-131
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONING]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
1. Reconnect front blower motor connector and A/C auto amp. connector.
2. Turn ignition switch ON.
3. Operate MODE switch to set air outlet to VENT.
4. Change fan speed from Lo to Hi, and check duty ratios between front blower motor harness connector
and ground by using an oscilloscope.
NOTE:
Calculate drive signal duty ratio as shown in the figure.
T2 = Approx. 1.6 ms
Is the inspection result normal?
YES
>> Replace front blower motor. Refer to
VTL-20, "FRONT BLOWER MOTOR : Removal and Installa-
.
NO
>> Replace A/C auto amp. Refer to
HAC-157, "Removal and Installation"
.
6.
CHECK FRONT BLOWER MOTOR RELAY GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between fuse block (J/B) harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> Repair harness or connector.
7.
CHECK FRONT BLOWER RELAY
Check front blower motor relay. Refer to
HAC-131, "Component Inspection (Front Blower Motor Relay)"
.
Is the inspection result normal?
YES
>> Repair harness or connector between front blower motor and fuse block (J/B).
NO
>> Replace front blower relay.
Component Inspection (Front Blower Motor)
INFOID:0000000009176868
1.
CHECK FRONT BLOWER MOTOR
1. Connect battery voltage to terminal 1 of front blower motor.
2. Connect ground to terminal 2 of front blower motor.
Does the front blower fan operate?
YES
>> Intermittent incident. Refer to
GI-49, "Intermittent Incident"
.
NO
>> Replace front blower motor. Refer to
VTL-20, "FRONT BLOWER MOTOR : Removal and Installa-
.
Component Inspection (Front Blower Motor Relay)
INFOID:0000000009176869
1.
CHECK BLOWER RELAY
Front blower motor
Condition
Duty ratio
(Approx.)
Connector
Terminal
Fan speed (manual)
VENT mode
M112
3
1st
25 %
2nd
33 %
3rd
41 %
4th
51 %
5th
61 %
6th
69 %
7th
81 %
JPLIA1210GB
Fuse block (J/B)
—
Continuity
Connector
Terminal
M68
13R
Ground
Yes
HAC-132
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONING]
FRONT BLOWER MOTOR
1. Turn ignition switch OFF.
2. Remove front blower motor relay.
3. Check continuity between front blower motor relay terminals 3
and 5 when voltage is supplied between terminals 1 and 2.
Is the inspection result normal?
YES
>> Inspection End.
NO
>> Replace front blower motor relay.
Terminals
Voltage
Continuity
3
5
ON
Yes
OFF
No
JSIIA1551ZZ
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