Nissan Maxima. Manual — part 306
DIAGNOSIS SYSTEM (BCM)
DEF-9
< SYSTEM DESCRIPTION >
C
D
E
F
G
H
I
J
K
M
A
B
DEF
N
O
P
REAR WINDOW DEFOGGER : CONSULT Function (BCM - REAR DEFOGGER)
INFOID:0000000010065032
DATA MONITOR
ACTIVE TEST
Monitor Item [Unit]
Description
PUSH SW [On/Off]
Indicates condition of push button ignition switch
REAR DEF SW [On/Off]
Indicates condition of rear window defogger switch
Test Item
Description
REAR DEFOGGER
This test is able to check rear window defogger operation [Off/On].
DEF-10
< DTC/CIRCUIT DIAGNOSIS >
REAR WINDOW DEFOGGER SWITCH
DTC/CIRCUIT DIAGNOSIS
REAR WINDOW DEFOGGER SWITCH
Description
INFOID:0000000010045579
• The rear window defogger is operated by turning the rear window defogger switch ON.
• Turns the indicator lamp in the rear window defogger switch ON when operating the rear window defogger.
Component Function Check
INFOID:0000000010045580
1.
CHECK REAR WINDOW DEFOGGER SWITCH FUNCTION
Check that the indicator lamp of rear window defogger illuminates with rear window defogger switch ON.
Is the inspection result normal?
YES
>> Rear window defogger switch function is OK.
NO
>> Refer to
.
Diagnosis Procedure
INFOID:0000000010045581
Regarding Wiring Diagram information, refer to
.
1.
CHECK A/C AUTO AMP. (REAR WINDOW DEFOGGER SWITCH)
Check A/C auto amp. operation.
Is the inspection result normal?
YES
>> Inspection End.
NO
>> GO TO 2
2.
CHECK REAR WINDOW DEFOGGER SWITCH REQUIRE SIGNAL
1. Turn ignition switch ON.
2. Check voltage between A/C auto amp. harness connector M37 terminal 27 and ground.
Is the inspection result normal?
YES
>> GO TO 3
NO
>> GO TO 4
3.
CHECK REAR WINDOW DEFOGGER SWITCH REQUIRE SIGNAL CIRCUIT FOR OPEN
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp harness connector M37.
3. Disconnect BCM harness connector M18.
4. Check continuity between A/C auto amp harness connector M37 terminal 27 and BCM harness connector
M18 terminal 38.
Is the inspection result normal?
YES
>> Replace BCM. Refer to
BCS-79, "Removal and Installation"
NO
>> Repair and replace harness.
Terminals
Condition of rear window de-
fogger switch
Voltage (V)
(Approx.)
(+)
(–)
A/C auto amp. connector
Terminal
M37
27
Ground
ON 0
OFF
5
BCM connector
Terminal
A/C auto amp. connector
Terminal
Continuity
M18 38
M37
27
Yes
REAR WINDOW DEFOGGER SWITCH
DEF-11
< DTC/CIRCUIT DIAGNOSIS >
C
D
E
F
G
H
I
J
K
M
A
B
DEF
N
O
P
4.
CHECK REAR WINDOW DEFOGGER SWITCH REQUIRE SIGNAL CIRCUIT FOR SHORT
1. Turn ignition switch OFF.
2. Disconnect BCM harness connector M18.
3. Disconnect A/C auto amp harness connector M37.
4. Check continuity between BCM harness connector M18 terminal 38 and ground.
Is the inspection result normal?
YES
>> Replace A/C auto amp.
• With color display, refer to
HAC-100, "Removal and Installation"
• With monochrome display, refer to
HAC-203, "Removal and Installation"
.
NO
>> Repair or replace harness.
BCM connector
Terminal
Ground
Continuity
M18
38
No
DEF-12
< DTC/CIRCUIT DIAGNOSIS >
REAR WINDOW DEFOGGER RELAY
REAR WINDOW DEFOGGER RELAY
Description
INFOID:0000000010045582
Power is supplied to the rear window defogger with BCM control.
Component Function Check
INFOID:0000000010045583
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:0000000010045584
Regarding Wiring Diagram information, refer to
.
1.
CHECK REAR WINDOW DEFOGGER RELAY GROUND CIRCUIT
1. Turn ignition switch ON.
2. Check voltage between BCM harness connector M18 terminal
59 and ground.
Is the inspection result normal?
YES
>> Rear window defogger relay 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 harness connector M18 (A) ter-
minal 59 and fuse block (J/B) harness connector M4 (B) terminal
4Q.
4. Check continuity between BCM harness connector M18 (A) ter-
minal 59 and ground.
Is the inspection result normal?
YES
>> GO TO 3
NO
>> Repair or replace harness.
Terminals
Condition of rear
window defogger
switch
Voltage (V)
(Approx.)
(+)
(–)
BCM connector
Terminal
M18
59
Ground
ON 0
OFF
Battery voltage
ALLIA0175ZZ
BCM connector
Terminal
Fuse block (J/B)
connector
Terminal
Continuity
M18 (A)
59
M4 (B)
4Q
Yes
BCM connector
Terminal
Ground
Continuity
M18 (A)
59
No
ALLIA0916ZZ
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