Infiniti QX4 (R50). Manual — part 306
Symptom
Possible cause
Repair order
LH low beam does not operate, but
LH high beam operates.
1. 20A fuse
2. Headlamp LH relay
3. Open in the LH low beam circuit
4. LH low beam ground circuit
5. Xenon bulb
6. HID control unit
7. Booster
1. Check 20A fuse (No. 32, located in fusible link and
fuse box). Verify battery positive voltage is present
at terminal 6 of headlamp LH relay.
2. Check headlamp LH relay
3. Check harness between headlamp LH relay terminal
7 and headlamp LH for open circuit.
4. Check harness between headlamp LH and ground.
5. Replace the xenon bulb with other side bulb or new
one. (If headlamps illuminate correctly, replace the
bulb.)
6. Replace the HID control unit with other side control
unit or new one. (If headlamps illuminate correctly,
replace the control unit.)
7. Replace booster as a headlamp assembly.
RH high beam does not operate,
but RH low beam operates.
1. Bulb
2. Headlamp RH relay
3. Open in the RH high beams
circuit
4. Lighting switch
1. Check bulb.
2. Check headlamp RH relay.
3. Check the following.
a. Harness between headlamp RH relay terminal 5 and
headlamp RH for open circuit
b. Harness between headlamp RH and lighting switch
for open circuit
4. Check lighting switch.
RH low beam does not operate,
but RH high beam operates.
1. 20A fuse
2. Headlamp RH relay
3. Open in the RH low beam cir-
cuit
4. RH low beam ground circuit
5. Xenon bulb
6. HID control unit
7. Booster
1. Check 20A fuse (No. 31 located in fusible link and
fuse box). Verify battery positive voltage is present
at terminal 6 of headlamp RH relay.
2. Check headlamp RH relay
3. Check harness between headlamp RH relay termi-
nal 7 and headlamp RH for open circuit.
4. Check harness between headlamp RH and ground.
5. Replace the xenon bulb with other side bulb or new
one. (If headlamps illuminate correctly, replace the
bulb.)
6. Replace the HID control unit with other side control
unit or new one. (If headlamps illuminate correctly,
replace the control unit.)
7. Replace booster as a headlamp assembly.
High beam indicator does not work. 1. Bulb
2. Open in high beam circuit
1. Check bulb in combination meter.
2. Check the following.
a. Harness between headlamp LH relay and combina-
tion meter for an open circuit
b. Harness between high beam indicator and lighting
switch
Battery saver control does not
operate properly.
1. RAP signal circuit
2. Door switch LH or RH circuit
3. Lighting switch circuit
4. Headlamp battery saver control
unit
5. Smart entrance control unit
1. Check harness between headlamp battery saver
control unit terminal 10 and smart entrance control
unit terminal 5 for open or short circuit.
2. Check the following.
a. Harness between smart entrance control unit and
LH or RH door switch for open or short circuit.
b. LH or RH door switch ground circuit.
c. LH or RH door switch.
3. Check the following.
a. Harness between headlamp battery saver control
unit terminals 5 or 13 and lighting switch terminal 11
for open or short circuit.
b. Harness between lighting switch terminal 5 and
ground.
c. Lighting switch.
4. Check headlamp battery saver control unit.
5. Check smart entrance control unit. (EL-324)
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
IDX
HEADLAMP (FOR USA) — XENON TYPE —
Trouble Diagnoses (Cont’d)
EL-41
BATTERY SAVER CONTROL UNIT INSPECTION TABLE
NBEL0189S01
Terminal No.
Wire
color
Item
Condition
Voltage
(Approximate value)
1
B/W
Ignition ON power
supply
Ignition switch
OFF or ACC
Less than 1V
ON or START
Battery voltage
2
PU/W Headlamp relays
(LH and RH)
Ignition switch
(with lighting switch
except OFF or 1ST)
OFF or ACC
More than 45 sec-
onds after ignition
switch is turned
OFF or ACC
Battery voltage
Within 45 seconds
after ignition switch
is turned OFF or
ACC
Less than 1V
ON or START
Less than 1V
Headlamps illuminate by auto light control.
Less than 1V
3
L
Headlamp switch
Ignition switch ON
Lighting switch
Except PASS or
2ND
Battery voltage
PASS or 2ND
Less than 1V
Headlamps illuminate by auto light control.
Less than 1V
4
B
Ground
—
—
5
G
Tail lamp switch
Lighting switch
OFF
Battery voltage
1ST or 2ND
Less than 1V
6
R
Tail lamp relay
Ignition switch
(with lighting switch
1ST or 2ND)
OFF or ACC
More than 45 sec-
onds after ignition
switch is turned
OFF or ACC
Battery voltage
Within 45 seconds
after ignition switch
is turned OFF or
ACC
Less than 1V
ON or START
Less than 1V
Headlamps illuminate by auto light control.
Less than 1V
7
G/R
Power supply
—
Battery voltage
8
PU/W Headlamp relays
(LH and RH)
Ignition switch
(with lighting switch
except OFF or 1ST)
OFF or ACC
More than 45 sec-
onds after ignition
switch is turned
OFF or ACC
Battery voltage
Within 45 seconds
after ignition switch
is turned OFF or
ACC
Less than 1V
ON or START
Less than 1V
Headlamps illuminate by auto light control.
Less than 1V
9
L
Headlamp switch
Ignition switch ON
Lighting switch
Except PASS or
2ND
Battery voltage
PASS or 2ND
Less than 1V
Headlamps illuminate by auto light control.
Less than 1V
HEADLAMP (FOR USA) — XENON TYPE —
Trouble Diagnoses (Cont’d)
EL-42
Terminal No.
Wire
color
Item
Condition
Voltage
(Approximate value)
10
R/Y
RAP signal
Ignition switch
OFF or ACC
(After more than 45 seconds with ignition
switch turned OFF or ACC)
Less than 1V
ON or START
Battery voltage
11
B
Ground
—
—
13
G
Tail lamp switch
Lighting switch
OFF
Battery voltage
1ST or 2ND
Less than 1V
14
R
Tail lamp relay
Ignition switch
(with lighting switch
1ST or 2ND)
OFF or ACC
More than 45 sec-
onds after ignition
switch is turned
OFF or ACC
Battery voltage
Within 45 seconds
after ignition switch
is turned OFF or
ACC
Less than 1V
ON or START
Less than 1V
Headlamps illuminate by auto light control.
Less than 1V
Bulb Replacement/Xenon Type
NBEL0190
CAUTION:
I
After replacing a new xenon bulb, be sure to make aiming
adjustments.
I
Hold only the plastic base when handling the bulb. Never
touch the glass envelope.
I
Do not leave headlamp reflector without bulb for a long
period of time. Dust, moisture, smoke, etc. entering head-
lamp body may affect the performance of the headlamp.
Remove headlamp bulb from the headlamp reflector just
before a replacement bulb is installed.
1.
Disconnect negative battery cable.
2.
Disconnect headlamp connector.
3.
Remove headlamp assembly.
WARNING:
Never service a xenon headlamp without disconnecting nega-
tive battery cable and with wet hands.
SEL349X
XENON BULB (LOW BEAM)
NBEL0190S01
1.
Remove headlamp seal cover.
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
IDX
HEADLAMP (FOR USA) — XENON TYPE —
Trouble Diagnoses (Cont’d)
EL-43
SEL461X
2.
Turn bulb socket counterclockwise with keep pushing, then
remove it.
SEL462X
3.
Release retaining pin.
4.
Remove the xenon bulb.
5.
Install in the reverse order of removal.
CAUTION:
I
When disposing of the xenon bulb, do not break it; always
dispose of it as is.
I
Make sure to install the bulb securely; if the xenon bulb is
improperly installed in its socket, high-tension current
leaks occur. This may lead to a melted bulb and/or bulb
socket.
SEL463X
HIGH BEAM
NBEL0190S02
1.
Turn the bulb counterclockwise (LH high beam) or clockwise
(RH high beam).
2.
Remove the bulb.
3.
Install in the reverse order of removal.
SEL464X
Aiming Adjustment
NBEL0191
LOW BEAM
NBEL0191S01
1.
Turn headlamp low beam on.
2.
Use adjusting screws to perform aiming adjustment.
I
First tighten the adjusting screw all the way and then
make adjustment by loosening the screw.
HEADLAMP (FOR USA) — XENON TYPE —
Bulb Replacement/Xenon Type (Cont’d)
EL-44
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