Infiniti G37 Coupe. Manual - part 647

EXL-8

< FUNCTION DIAGNOSIS >

[XENON TYPE]

HEADLAMP SYSTEM

FUNCTION DIAGNOSIS

HEADLAMP SYSTEM

System Diagram

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System Description

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OUTLINE

• Mobile valve shade type is adopted. Xenon headlamp switches the high beam and the low beam with one

xenon bulb each on right and left. 

• Headlamp is controlled by combination switch reading function and headlamp control function of BCM, and

relay control function of IPDM E/R.

HEADLAMP BASIC OPERATION 

• BCM detects the combination switch condition with the combination switch reading function.
• BCM transmits the low beam request signal to IPDM E/R with CAN communication according to the head-

lamp ON condition.

Headlamp ON condition

- Lighting switch 2ND
- Lighting switch PASS
- Lighting switch AUTO, and the auto light function ON judgment (with auto light system)
• IPDM E/R turns the integrated headlamp low relay ON, and turns the headlamp ON according to the low

beam request signal.

HEADLAMP HI/LO SWITCHING OPERATION

• BCM transmits the high beam request signal to IPDM E/R and the combination meter (through unified meter

and A/C amp.) with CAN communication according to the high beam switching condition. 

High beam switching condition

- Lighting switch HI with the headlamp ON
- Lighting switch PASS
• Combination meter turns the high beam indicator lamp ON according to the high beam request signal. 
• IPDM E/R turns the integrated headlamp high relay ON, and turns the headlamp ON according to the high

beam request signal.

JPLIA0001GB

HEADLAMP SYSTEM

EXL-9

< FUNCTION DIAGNOSIS >

[XENON TYPE]

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• When the headlamp high relay is turned ON, magnetic force is

applied to the high beam solenoid (1) by a current. The mobile
valve shade (2) is switched to the high beam position.

• When the headlamp high relay is turned OFF, the current stops.

The mobile valve shade returns to the low beam position automati-
cally.

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EXL-10

< FUNCTION DIAGNOSIS >

[XENON TYPE]

HEADLAMP SYSTEM

Component Parts Location

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Component Description

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1.

Headlamp

2.

Combination switch

3.

BCM

4.

IPDM E/R

5.

Unified meter and A/C amp.

6.

High beam indicator lamp

A.

Dash side lower (Passenger side)

B.

Engine room dash panel (RH)

C.

Behind cluster lid C

D.

On the combination meter

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Part

Description

BCM

• Judges each switch condition by the combination switch reading function.
• Judges that the headlamp is turned ON according to the vehicle condition. 
- Requests the headlamp relay (HI/LO) ON to IPDM E/R (with CAN communication). 
- Requests the high beam indicator lamp ON to the combination meter [with CAN 

communication (through unified meter and A/C amp.)].

IPDM E/R

Controls the integrated relay, and supplies voltage to the load according to the request 
from BCM (with CAN communication).

HEADLAMP SYSTEM

EXL-11

< FUNCTION DIAGNOSIS >

[XENON TYPE]

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Combination switch
(Lighting & turn signal switch)

Refer to 

BCS-5, "System Diagram"

.

Combination meter
(High beam indicator lamp)

Turns the high beam indicator lamp ON according to the request from BCM [with CAN 
communication (through unified meter and A/C amp.)].

Headlamp assem-
bly

• HID control unit
• Xenon bulb

Refer to 

EXL-68, "Description"

.

High beam solenoid

Refer to 

EXL-64, "Description"

.

Part

Description