Nissan Pathfinder. Manual — part 303
REAR WINDOW DEFOGGER RELAY
DEF-31
< DTC/CIRCUIT DIAGNOSIS >
C
D
E
F
G
H
I
J
K
M
A
B
DEF
N
O
P
REAR WINDOW DEFOGGER RELAY
Description
INFOID:0000000009175558
Power is supplied to the rear window defogger with BCM control.
Component Function Check
INFOID:0000000009175559
1.
CHECK REAR WINDOW DEFOGGER RELAY POWER SUPPLY CIRCUIT
Check that an operation noise of rear window defogger relay [located in fuse block (J/B)] can be heard when
turning the rear window defogger switch ON.
Is the inspection result normal?
YES
>> Rear window defogger relay power supply circuit is OK.
NO
>> Refer to
.
Diagnosis Procedure
INFOID:0000000009175560
Regarding Wiring Diagram information, refer to
.
1.
CHECK REAR WINDOW DEFOGGER RELAY GROUND CIRCUIT
1. Turn ignition switch ON.
2. Check voltage between BCM connector and ground.
Is the inspection result normal?
YES
>> Rear window defogger power supply circuit is OK.
NO
>> GO TO 2.
2.
CHECK HARNESS CONTINUITY
1. Turn ignition switch OFF.
2. Disconnect BCM and fuse block (J/B).
3. Check continuity between BCM connector and fuse block (J/B) connector.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace harness.
3.
CHECK REAR WINDOW DEFOGGER RELAY
Check rear window defogger relay.
DEF-32, "Component Inspection"
.
Is the inspection result normal?
YES
>> Check intermittent incident. Refer to
GI-49, "Intermittent Incident"
NO
>> Replace rear window defogger relay.
(+)
(–)
Condition
Voltage (V)
(Approx.)
BCM
Connector
Terminal
M19
61
Ground
Rear window defogger
switch
ON 0
OFF Battery
voltage
BCM
Fuse block (J/B)
Continuity
Connector
Terminal
Connector
Terminal
M19
61
M4
6P
Yes
DEF-32
< DTC/CIRCUIT DIAGNOSIS >
REAR WINDOW DEFOGGER RELAY
Component Inspection
INFOID:0000000009175561
1.
CHECK REAR WINDOW DEFOGGER RELAY
Check rear window defogger relay.
Is the inspection result normal?
YES
>> Inspection End.
NO
>> Replace rear window defogger relay.
Terminal
Condition
Continuity
Rear window
defogger relay
3
5
12V direct current supply between termi-
nals 1 and 2.
Yes
No current supply
No
SEF497Y
REAR WINDOW DEFOGGER POWER SUPPLY AND GROUND CIRCUIT
DEF-33
< DTC/CIRCUIT DIAGNOSIS >
C
D
E
F
G
H
I
J
K
M
A
B
DEF
N
O
P
REAR WINDOW DEFOGGER POWER SUPPLY AND GROUND CIRCUIT
Description
INFOID:0000000009175562
Heats the heating wire with the power supply from the rear window defogger relay to prevent the rear window
from fogging up.
Component Function Check
INFOID:0000000009175563
1.
CHECK REAR WINDOW DEFOGGER
Check that the heating wire of rear window defogger is heated when turning the rear window defogger switch
ON.
Is the inspection result normal?
YES
>> Rear window defogger is OK.
NO
>> Refer to
.
Diagnosis Procedure
INFOID:0000000009175564
Regarding Wiring Diagram information, refer to
.
1.
CHECK FUSES
Check if any of the following fuses in fuse block (J/B) are blown.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> If fuse is blown, be sure to eliminate cause of malfunction before installing new fuse.
2.
CHECK POWER SUPPLY CIRCUIT
1. Turn ignition switch ON.
2. Check voltage between rear window defogger connector and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> GO TO 4.
3.
CHECK GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect rear window defogger.
3. Check continuity between rear window defogger connector and ground.
COMPONENT PARTS
AMPERE
FUSE NO.
Fuse block (J/B)
15A
23
15A
24
(+)
(–)
Condition
Voltage (V)
(Approx.)
Rear window defogger
Connector
Terminal
D510
1
Ground
Rear window defogger
switch
ON
Battery voltage
OFF
0
Rear window defogger
Ground
Continuity
Connector
Terminal
D525
2
Yes
DEF-34
< DTC/CIRCUIT DIAGNOSIS >
REAR WINDOW DEFOGGER POWER SUPPLY AND GROUND CIRCUIT
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Repair or replace harness.
4.
CHECK HARNESS CONTINUITY 1
1. Turn ignition switch OFF.
2. Disconnect rear window defogger condenser and rear window defogger.
3. Check continuity between rear window defogger condenser connector and rear window defogger connec-
tor.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Replace or repair harness.
5.
CHECK HARNESS CONTINUITY 2
1. Disconnect fuse block (J/B).
2. Check continuity between fuse block (J/B) connector and rear window defogger condenser connector.
Is the inspection result normal?
YES
>> Replace rear window defogger condenser.
NO
>> Replace or repair harness.
6.
CHECK FILAMENT
Check filament. Refer to
DEF-34, "Component Inspection"
.
Is the inspection result normal?
YES
>> Refer to
GI-49, "Intermittent Incident"
.
NO
>> Repair filament. Refer to
DEF-51, "Inspection and Repair"
.
Component Inspection
INFOID:0000000009175565
1.
CHECK FILAMENT
Check the filament for damage or open circuits.
DEF-51, "Inspection and Repair"
Is the inspection result normal?
YES
>> Inspection End.
NO
>> Repair filament. Refer to
DEF-51, "Inspection and Repair"
.
Rear window defogger con-
denser
Rear window defogger
Continuity
Connector
Terminal
Connector
Terminal
D508
2
D525
1
Yes
Fuse block (J/B)
Rear window defogger con-
denser
Continuity
Connector
Terminal
Connector
Terminal
B29
3T
D508
1
Yes
5T
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