Infiniti EX35. Manual - part 792

EXL-212

< FUNCTION DIAGNOSIS >

[HALOGEN TYPE]

HEADLAMP SYSTEM

FUNCTION DIAGNOSIS

HEADLAMP SYSTEM

System Diagram

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System Description

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OUTLINE

Headlamp is controlled by combination switch reading function and headlamp control function of BCM, and
relay control function of IPDM E/R.

HEADLAMP (LO) 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 (LO) ON condition.

Headlamp (LO) ON condition

- Lighting switch 2ND
• IPDM E/R turns the integrated headlamp low relay ON, and turns the headlamp ON according to the low

beam request signal.

HEADLAMP (HI) 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 headlamp (HI) ON condition. 

Headlamp (HI) ON condition

- Lighting switch HI with the lighting switch 2ND
- 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.

JPLIA0911GB

HEADLAMP SYSTEM

EXL-213

< FUNCTION DIAGNOSIS >

[HALOGEN TYPE]

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Component Parts Location

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1.

Headlamp (HI)

2.

Headlamp (LO)

3.

Combination switch

4.

BCM

5.

IPDM E/R

6.

Unified meter and A/C amp.

7.

High beam indicator lamp

A.

Dash side lower (Passenger side)

B.

Engine room dash panel (LH)

C.

Behind the cluster lid c

D.

On the combination meter

JPLIA0942ZZ

EXL-214

< FUNCTION DIAGNOSIS >

[HALOGEN TYPE]

HEADLAMP SYSTEM

Component Description

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Part

Description

BCM

• Detects 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).

IPDM E/R

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

Combination switch
(Lighting & turn signal switch)

Refer to 

BCS-8, "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.)].

AUTO LIGHT SYSTEM

EXL-215

< FUNCTION DIAGNOSIS >

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AUTO LIGHT SYSTEM

System Diagram

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System Description

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OUTLINE

•  Auto light system is controlled by each function of BCM and IPDM E/R.

Control by BCM

- Combination switch reading function
- Headlamp control function
- Auto light function
- Delay timer function

Control by IPDM E/R

- Relay control function
• Auto light system has the auto light function and the delay timer function.
- Auto light function turns the exterior lamps* and each illumination ON/OFF automatically according to the

outside brightness.

- When auto light system turns the exterior lamps ON with the ignition switch OFF, delay timer function turns

the exterior lamps OFF depending on the vehicle condition with the auto light function after a certain period
of time.

*: Headlamp (LO/HI), parking lamp, tail lamp, and front fog lamp (Headlamp HI and front fog lamp depend on
the combination switch condition.)

AUTO LIGHT FUNCTION

• BCM detects the combination switch condition with the combination switch reading function.
• BCM supplies voltage to optical sensor when the ignition switch is turned ON or ACC.
• Optical sensor converts outside brightness (lux) to voltage and transmits the optical sensor signal to BCM.
• BCM judges outside brightness from the optical sensor signal and judges ON/OFF condition of the exterior

lamp and each illumination according to the outside brightness. 

• BCM transmits each request signal to IPDM E/R with CAN communication according to ON/OFF condition

by the auto light function.

NOTE:
ON/OFF timing differs based on the sensitivity from the setting. The setting can be set by CONSULT-III. Refer
to 

EXL-33, "HEADLAMP : CONSULT-III Function (BCM - HEAD LAMP)"

.

DELAY TIMER FUNCTION

BCM turns the exterior lamp OFF depending on the vehicle condition with the auto light function when the igni-
tion switch is turned OFF.
• Turns the exterior lamp OFF 5 minutes after detecting that any door opens (Door switch ON).
• Turns the exterior lamp OFF a certain period of time* after closing all doors (Door switch ON

→

OFF).

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