Nissan Pathfinder. Manual — part 719
PTC HEATER
HAC-137
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONING]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
3. Check continuity between PTC heater connector and ground.
Is the inspection result normal?
YES
>> Check intermittent incident. Refer to
GI-49, "Intermittent Incident"
.
NO
>> Replace or repair harness.
M118
1
E11
5
Yes
3
E12
PTC heater connector
Terminal
Ground
Continuity
M118
1
No
3
HAC-138
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONING]
REAR BLOWER MOTOR
REAR BLOWER MOTOR
Diagnosis Procedure
INFOID:0000000009176877
Regarding Wiring Diagram information, refer to
REAR BLOWER MOTOR 1
1.
CHECK FUSE
Check 20A fuse [No. 70, located in the fuse block (J/B)].
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Replace the blown fuse after repairing the affected circuit.
2.
CHECK POWER SUPPLY FOR BLOWER MOTOR
1. Turn ignition switch ON.
2. Check voltage between rear blower motor harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> GO TO 7.
3.
CHECK POWER SUPPLY FOR REAR BLOWER MOTOR RESISTOR 1
Check voltage between rear blower motor resistor 1 harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> GO TO 8.
4.
CHECK BLOWER MOTOR CONTROL SIGNAL
1. Turn mode control to VENT.
2. Turn fan control to 1st speed.
3. Check voltage between rear blower motor resistor 1 harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 5.
NO-1 >> Less than approximately 2.5 V: GO TO 9.
NO-2 >> More than approximately 10 V: Replace auto amp.
5.
CHECK REAR BLOWER MOTOR RESISTOR 1 GROUND CIRCUIT
1. Disconnect rear blower motor resistor 1 connector.
(+)
(
−)
Voltage
(Approx.)
Rear blower motor
Connector
Terminal
M107
1
Ground
Battery voltage
(+)
(
−)
Voltage
(Approx.)
Rear blower motor resistor 1
Connector
Terminal
M104
1
Ground
Battery voltage
(+)
(
−)
Voltage
(Approx.)
Rear blower motor resistor 1
Connector
Terminal
M104
2
Ground
2.5 V
REAR BLOWER MOTOR
HAC-139
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONING]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
2. Check continuity between rear blower motor resistor 1 harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Repair harness or connector.
6.
CHECK BLOWER MOTOR FEEDBACK SIGNAL
1. Reconnect rear blower motor resistor 1 connector.
2. Turn ignition switch ON.
3. Turn fan control to 1st speed.
4. Check voltage between auto amp. harness connector and ground.
Is the inspection result normal?
YES
>> Replace auto amp.
NO
>> Repair harness or connector.
7.
CHECK POWER SUPPLY OF BLOWER RELAY
1. Turn ignition switch OFF.
2. Remove blower relay.
3. Turn ignition switch ON.
4. Check voltage between rear blower relay connector terminals and ground.
Is the inspection result normal
YES
>> Check rear blower motor relay. Refer to
HAC-142, "Component Inspection (Rear Blower Motor
.
NO
>> Repair harness or connector.
8.
CHECK CIRCUIT CONTINUITY BETWEEN BLOWER MOTOR AND REAR BLOWER MOTOR RESISTOR
1
1. Turn ignition switch OFF.
2. Disconnect rear blower motor resistor 1 connector.
3. Check continuity between blower motor harness connector and rear blower motor resistor 1 harness con-
nector.
Is the inspection result normal?
Rear blower motor resistor 1
—
Continuity
Connector
Terminal
M104
3
Ground
Yes
(+)
(
−)
Condition
Voltage
(Approx.)
Auto amp.
Connector
Terminal
M50
34
Ground
Blower speed: 1st
(Blower motor operating)
10 V
(+)
(
−)
Voltage
(Approx.)
Rear blower relay
Connector
Terminal
M108
1
Ground
Battery voltage
3
6
Blower motor
Rear blower motor resistor 1
Continuity
Connector
Terminal
Connector
Terminal
M107
2
M104
1
Yes
HAC-140
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONING]
REAR BLOWER MOTOR
YES
>> Replace blower motor.
NO
>> Repair harness or connector.
9.
CHECK REAR BLOWER MOTOR RESISTOR 1
Check rear blower motor resistor 1. Refer to
HAC-142, "Component Inspection (Rear Blower Motor Relay)"
Is the inspection result normal?
YES
>> Replace auto amp.
NO
>> Replace rear blower motor resistor 1.
REAR BLOWER MOTOR 2
1.
CHECK FUSE
Check 20A fuse [Nos. 71, located in the fuse block (J/B)].
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Replace fuse after repairing the affected circuit.
2.
CHECK POWER SUPPLY FOR BLOWER MOTOR
1. Turn ignition switch ON.
2. Check voltage between rear blower motor harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> GO TO 7.
3.
CHECK POWER SUPPLY FOR REAR BLOWER MOTOR RESISTOR 2
Check voltage between rear blower motor resistor 2 harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> GO TO 8.
4.
CHECK BLOWER MOTOR CONTROL SIGNAL
1. Turn mode control to VENT.
2. Turn fan control to 1st speed.
3. Check voltage between rear blower motor resistor 2 harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 5.
NO-1 >> Less than approximately 2.5 V: GO TO 9.
NO-2 >> More than approximately 10 V: Replace auto amp.
(+)
(
−)
Voltage
(Approx.)
Rear blower motor
Connector
Terminal
B134
1
Ground
Battery voltage
(+)
(
−)
Voltage
(Approx.)
Rear blower motor resistor 2
Connector
Terminal
B133
1
Ground
Battery voltage
(+)
(
−)
Voltage
(Approx.)
Rear blower motor resistor 2
Connector
Terminal
B133
2
Ground
2.5 V
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