Infiniti G37 Coupe. Manual - part 662

EXL-68

< COMPONENT DIAGNOSIS >

[XENON TYPE]

XENON HEADLAMP

XENON HEADLAMP

Description

INFOID:0000000001604661

OUTLINE

• The lamp light source is by the arch discharge by applying high voltage into the xenon gas-filled bulb instead

of the halogen bulb filament. 

• Sight becomes more natural and brighter because the amount of light are gained adequately and the color of

light is sunshine-like white. 

• The xenon bulb drops the amount of light, repeats blinking, and illuminates in red if the bulb reaches the ser-

vice life.

ILLUMINATION PRINCIPLE

1.

 Discharging starts in high voltage pulse between bulb elec-
trodes.

2.

Xenon gas is activated by current between electrodes. Pale light
is emitted.

3.

The luminous tube (bulb) temperature elevates. Evaporated
halide is activated by discharge. The color of light changes into
white.

NOTE:
• Brightness and the color of light may change slightly immediately

after the headlamp turned ON until the xenon bulb becomes sta-
ble. This is not malfunction.

• Illumination time lag may occur between right and left. This is not

malfunction.

PRECAUTIONS FOR TROUBLE DIAGNOSIS

Representative malfunction examples are; "Light does not turn ON", "Light blinks", and "Brightness is inade-
quate." The cause often be the xenon bulb. Such malfunctions, however, are occurred occasionally by HID
control unit malfunction or lamp case malfunction. Specify the malfunctioning part with diagnosis procedure. 

WARNING:

• Never touch the harness, HID control unit, the inside and metal part of lamp when turning the head-

lamp ON or operating the light switch. 

• Never work with wet hands.

CAUTION:

• Never perform HID control unit circuit diagnosis with a circuit tester or an equivalent.
• Temporarily install the headlamp on the vehicle. Connect the battery to the connector (vehicle side)

when checking ON/OFF status.

• Disconnect the battery negative terminal before disconnecting the lamp socket connector or the har-

ness connector.

• Check for fusing of the fusible link(s), open around connector, short, disconnection if the symptom

is caused by electric error.

NOTE:
• Turn the switch OFF once before turning ON, if the ON/OFF is inoperative.
• The xenon bulb drops the amount of light, repeats blinking, and illuminates in red if the bulb reaches the ser-

vice life.

Diagnosis Procedure

INFOID:0000000001604662

1.

CHECK XENON BULB

Install the normal bulb to the applicable headlamp. Check that the xenon bulb is turned ON.

Is the headlamp turned ON?

YES

>> Replace the xenon bulb.

NO

>> GO TO 2.

2.

CHECK HID CONTROL UNIT

Install the normal HID control unit to the applicable headlamp. Check that the lamp is turned ON.

Is the headlamp turned ON?

JPLIA0421GB

XENON HEADLAMP

EXL-69

< COMPONENT DIAGNOSIS >

[XENON TYPE]

C

D

E

F

G

H

I

J

K

M

A

B

EXL

N

O

P

YES

>> Replace HID control unit. 

NO

>> GO TO 3.

3.

CHECK XENON HEADLAMP HOUSING ASSEMBLY

Install the normal xenon headlamp housing assembly to the applicable headlamp. Check that the xenon head-
lamp is turned ON.
Is the headlamp turned ON?

YES

>> Replace the front combination lamp. (Xenon headlamp housing voltage converter malfunctions.)

NO

>> Xenon headlamp is normal.

EXL-70

< COMPONENT DIAGNOSIS >

[XENON TYPE]

HEADLAMP LEVELIZER CIRCUIT

HEADLAMP LEVELIZER CIRCUIT

Description

INFOID:0000000001604663

The headlamp levelizer adjusts the headlamp light axis upward and downward with the aiming motor inte-
grated in the front combination lamp.

Component Function Check

INFOID:0000000001604664

1.

CHECK AIMING MOTOR OPERATION

CONSULT-III ACTIVE TEST

1.

Start the engine.

2.

Turn the lighting switch 2ND.

3.

Select “LEVELIZER TEST” of ADAPTIVE LIGHT active test item.

4.

With operating the test item, check the operation.

Is the operation normal?

YES

>> Headlamp levelizer circuit is normal.

NO

>> Refer to 

EXL-70, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000001604665

1.

CHECK AIMING MOTOR DRIVE SIGNAL OUTPUT

CONSULT-III ACTIVE TEST

1.

Start the engine. 

2.

Turn the light switch 2ND.

3.

Select “LEVELIZER TEST” of ADAPTIVE LIGHT active test item.

4.

With operating the test item, check the voltage between the AFS control unit harness connector and the
ground.

Is the measurement value normal?

YES

>> GO TO 2.

NO

>> GO TO 3.

2.

CHECK AIMING MOTOR DRIVE SIGNAL CIRCUIT INPUT

1.

Turn the ignition switch OFF.

2.

Disconnect AFS control unit connector and aiming motor connector.

3.

Check continuity between AFS control unit harness connector and the aiming motor harness connector.

Test item

Light axis angle

(Reference value)

10 m (32.8 ft)-forward 

light axis change refer-

ence quantity

(Approx.) 

LEVELIZER TEST

Origin

0

°

—

Peak

2.5

°

450 mm (17.9 in)

Terminals

Test item

Voltage

(Approx.)

(+)

(

−

)

AFS control unit

Ground

LEVELIZER 

TEST

Connector

Terminal

RH

M16

19

Origin

8.8 V

Peak

1.9 V

LH

40

Origin

8.8 V

Peak

1.9 V

HEADLAMP LEVELIZER CIRCUIT

EXL-71

< COMPONENT DIAGNOSIS >

[XENON TYPE]

C

D

E

F

G

H

I

J

K

M

A

B

EXL

N

O

P

Does continuity exist?

YES

>> Replace the front combination lamp.

NO

>> Repair the harnesses and connectors.

3.

CHECK AIMING MOTOR DRIVE SIGNAL SHORT CIRCUIT

1.

Turn the ignition switch OFF.

2.

Disconnect AFS control unit connector and aiming motor connector.

3.

Check continuity between AFS control unit harness connector and ground.

Does continuity exist?

YES

>> Repair the harness and connectors.

NO

>> Replace AFS control unit.

Terminals

Continuity

(+)

(

−

)

AFS control unit

Aiming motor

Connector

Terminal

Connector

Terminal

RH

M16

19

E26

1

Existed

LH

40

E56

1

Terminals

Continuity

(+)

(

−

)

AFS control unit

Ground

Connector

Terminal

RH

M16

19

Not existed

LH

40