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)

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)

B/W

Ignition ON power
supply

Ignition switch

OFF or ACC

Less than 1V

ON or START

Battery voltage

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

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

Ground

—

Tail lamp switch

Lighting switch

OFF

Battery voltage

1ST or 2ND

Less than 1V

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

G/R

Power supply

—

Battery voltage

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

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)

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

Ground

—

Tail lamp switch

Lighting switch

OFF

Battery voltage

1ST or 2ND

Less than 1V

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:

After replacing a new xenon bulb, be sure to make aiming
adjustments.

Hold only the plastic base when handling the bulb. Never
touch the glass envelope.

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.

Disconnect negative battery cable.

Disconnect headlamp connector.

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

Remove headlamp seal cover.

IDX

HEADLAMP (FOR USA) — XENON TYPE —

Trouble Diagnoses (Cont’d)

EL-43

SEL461X

Turn bulb socket counterclockwise with keep pushing, then
remove it.

SEL462X

Release retaining pin.

Remove the xenon bulb.

Install in the reverse order of removal.

CAUTION:

When disposing of the xenon bulb, do not break it; always
dispose of it as is.

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

Turn the bulb counterclockwise (LH high beam) or clockwise
(RH high beam).

Remove the bulb.

Install in the reverse order of removal.

SEL464X

Aiming Adjustment

NBEL0191

LOW BEAM

NBEL0191S01

Turn headlamp low beam on.

Use adjusting screws to perform aiming adjustment.

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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