Infiniti QX4 (R50). Manual — part 334
Wiring Diagram — DEF —
NBEL0074
MEL815L
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
IDX
REAR WINDOW DEFOGGER
Wiring Diagram — DEF —
EL-153
MEL816L
REAR WINDOW DEFOGGER
Wiring Diagram — DEF — (Cont’d)
EL-154
Trouble Diagnoses
NBEL0075
DIAGNOSTIC PROCEDURE
NBEL0075S01
SYMPTOM: Rear window defogger does not activate, or does
not go off after activating.
1
CHECK REAR WINDOW DEFOGGER OUTPUT SIGNAL
1. Turn ignition switch to ON position.
2. Check voltage between smart entrance control unit harness terminal 2 and ground.
SEL384X
OK or NG
OK
©
Check the following.
I
Rear window defogger relay
(Refer to EL-157.)
I
Rear window defogger circuit
I
Rear window defogger filament
(Refer to EL-157.)
NG
©
GO TO 2.
2
CHECK DEFOGGER RELAY COIL SIDE CIRCUIT
1. Disconnect smart entrance control unit connector.
2. Turn ignition switch to ON position.
3. Check voltage between smart entrance control unit terminal 2 and ground.
SEL385X
OK or NG
OK
©
GO TO 3.
NG
©
Check the following.
I
7.5A fuse [No. 11, located in the fuse block (J/B)]
I
Rear window defogger relay
I
Harness for open or short between rear window defogger relay and smart entrance
control unit
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
IDX
REAR WINDOW DEFOGGER
Trouble Diagnoses
EL-155
3
CHECK REAR WINDOW DEFOGGER SWITCH INPUT SIGNAL
Check continuity between smart entrance control unit terminal 39 and ground.
SEL386X
OK or NG
OK
©
GO TO 4.
NG
©
Check the following.
I
Rear window defogger switch (with navigation system)
(Refer to EL-157.)
I
A/C auto amp. (without navigation system)
I
Harness for open or short between smart entrance control unit and rear window defog-
ger switch (with navigation system) or A/C auto amp. (without navigation system)
I
Rear window defogger switch (with navigation system) or A/C auto amp. (without navi-
gation system) ground circuit
4
CHECK IGNITION INPUT SIGNAL
Check voltage between smart entrance control unit terminal 33 and ground.
SEL387X
OK or NG
OK
©
GO TO 5.
NG
©
Check the following.
I
7.5A fuse [No. 11, located in the fuse block (J/B)]
I
Harness for open or short between smart entrance control unit and fuse
REAR WINDOW DEFOGGER
Trouble Diagnoses (Cont’d)
EL-156
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